Journal articles: 'Oxide Ceramic Matrix Composite'

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Karadimas, George, and Konstantinos Salonitis. "Ceramic Matrix Composites for Aero Engine Applications—A Review." Applied Sciences 13, no. 5 (February 26, 2023): 3017. http://dx.doi.org/10.3390/app13053017.

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Ceramic matrix materials have attracted great attention from researchers and industry due to their material properties. When used in engineering systems, and especially in aero-engine applications, they can result in reduced weight, higher temperature capability, and/or reduced cooling needs, each of which increases efficiency. This is where high-temperature ceramics have made considerable progress, and ceramic matrix composites (CMCs) are in the foreground. CMCs are classified into non-oxide and oxide-based ones. Both families have material types that have a high potential for use in high-temperature propulsion applications. The oxide materials discussed will focus on alumina and aluminosilicate/mullite base material families, whereas for non-oxides, carbon, silicon carbide, titanium carbide, and tungsten carbide CMC material families will be discussed and analyzed. Typical oxide-based ones are composed of an oxide fiber and oxide matrix (Ox-Ox). Some of the most common oxide subcategories are alumina, beryllia, ceria, and zirconia ceramics. On the other hand, the largest number of non-oxides are technical ceramics that are classified as inorganic, non-metallic materials. The most well-known non-oxide subcategories are carbides, borides, nitrides, and silicides. These matrix composites are used, for example, in combustion liners of gas turbine engines and exhaust nozzles. Until now, a thorough study on the available oxide and non-oxide-based CMCs for such applications has not been presented. This paper will focus on assessing a literature survey of the available oxide and non-oxide ceramic matrix composite materials in terms of mechanical and thermal properties, as well as the classification and fabrication methods of those CMCs. The available manufacturing and fabrication processes are reviewed and compared. Finally, the paper presents a research and development roadmap for increasing the maturity of these materials allowing for the wider adoption of aero-engine applications.

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Kaya, Cengiz. "Current Status of Oxide Fibre-Reinforced Oxide Ceramic Matrix Composites for Gas Turbine Applications." Key Engineering Materials 434-435 (March 2010): 1–4. http://dx.doi.org/10.4028/www.scientific.net/kem.434-435.1.

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Recent developments in the processing, understanding and mechanical/thermomechanical properties of oxide fibre reinforced oxide ceramic matrix composites for high temperature applications are reported. Two dimensional composite plates and uni-directional tubular composite (so called mini-composite) specimens are successfully manufactured and their microstructure, matrix/ fiber interface as well as mechanical properties are examined. It is shown that the microstructural variations, such as porosity size and interface between fibre and matrix determine the fracture behaviour and high temperature performance of the composites. The optimised components produced are considered to be suitable for gas turbine applications.

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Balazsi, Katalin, Mónika Furkó, Piotr Klimczyk, and Csaba Balázsi. "Influence of Graphene and Graphene Oxide on Properties of Spark Plasma Sintered Si3N4 Ceramic Matrix." Ceramics 3, no. 1 (February 5, 2020): 40–50. http://dx.doi.org/10.3390/ceramics3010005.

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The sintering of ceramic matrix composites is usually carried out by raising the sintering temperature below the melting point of components. Spark plasma sintering (SPS) has the capability to densify ceramics at a relatively low temperature in a very short time. Two different additions, multilayered graphene (MLG) and graphene oxide (GrO), were added to Si3N4 ceramic matrix in various amount; 5 wt% and 30 wt%. The influence of reinforcing phase on final properties of spark plasma sintered Si3N4 composite was studied. The uniaxial-pressure-assisted SPS sintering resulted in a preferential alignment of both type of graphene in the Si3N4 ceramic matrix, leading to highly anisotropic properties with lower mechanical behavior but better tribological and electrical properties.

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Kaya, Figen. "Damage Detection in Fibre Reinforced Ceramic and Metal Matrix Composites by Acoustic Emission." Key Engineering Materials 434-435 (March 2010): 57–60. http://dx.doi.org/10.4028/www.scientific.net/kem.434-435.57.

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In this work damage micro-mechanisms of two different types of fibre reinforced composites are investigated by acoustic emission, AE. Ceramic based oxide fibre reinforced mullite matrix composite and metallic based SiC fibre reinforced titanium matrix composites exhibit different fracture mechanisms during loading and AE technique could pinpoint these damage mechanisms based on the AE responses detected simultaneously. The results show that in a ceramic matrix composite, the identification of fibre fracture and matrix cracking requires careful analysis of the AE data as both fibres and matrix break in brittle manner. Whereas the separation of fibre fracture from the ductile tearing of matrix ligaments could be easier in metallic based composites, such as titanium matrix composites.

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Guglielmi, P. O., G. F. Nunes, M. Hablitzel, Dachamir Hotza, and Rolf Janssen. "Production of Oxide Ceramic Matrix Composites by a Prepreg Technique." Materials Science Forum 727-728 (August 2012): 556–61. http://dx.doi.org/10.4028/www.scientific.net/msf.727-728.556.

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Ceramic matrix composites (CMCs) were developed to overcome the intrinsic brittleness and lack of reliability of monolithic ceramics. Their major advantages include high temperature capability, light weight, corrosion resistance and adequate damage tolerance. All-oxide Ceramic Matrix Composites (OCMCs) offer essential advantages with respect to long time stability in oxidizing atmospheres, when compared to their non-oxide counterparts. Nevertheless, there is at present almost no production concept which meets the requirements in view of cost and performance for these materials. This work aims at producing OCMCs by means of a more flexible production route. This is achieved by integrating well-known powder metallurgy routes with the prepreg technique, used at present for producing commercial high performance polymer matrix composites. The processing consists of the following steps: (a) infiltration of commercial alumina fiber fabrics (3M NextelTM610) with a liquid suspension of the matrix material; (b) lamination of the pre-infiltrated fiber textiles with a paraffin-based suspension for the formation of prepregs; (c) layup of prepregs; (d) warm-pressing for the consolidation of the green body; (e) debinding and (f) reaction bonding and/or sintering for synthesis of the oxide matrix. Pure alumina or Reaction Bonded Aluminum Oxide (RBAO) can be used as matrix materials and damage tolerance is achieved by the porous, weak-matrix approach. Microstructural analysis of a pure alumina composite fabricated by this route show good infiltration of fiber bundles and proves the good adhesion of prepregs during processing. Average strength value of 199 MPa in fiber direction is in good agreement with values presented in the literature for OCMCs produced by other techniques.

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Böttcher, Maike, Daisy Nestler, Jonas Stiller, and Lothar Kroll. "Injection Moulding of Oxide Ceramic Matrix Composites: Comparing Two Feedstocks." Key Engineering Materials 809 (June 2019): 140–47. http://dx.doi.org/10.4028/www.scientific.net/kem.809.140.

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Ceramic materials are suitable for use in the high temperature range. Oxide ceramics, in particular, have a high potential for long-term applications under thermal cycling and oxidising atmosphere. However, monolithic oxide ceramics are unsuitable for use in high-temperature technical applications because of their brittleness. Thin-walled, oxidation resistant, and high-temperature resistant materials can be developed by reinforcing oxide ceramics with ceramic fibres such as alumina fibres. The increase of the mechanical stability of the composites in comparison to the non-fibre reinforced material is of outstanding importance. Possible stresses or cracks can be derived along the fibre under mechanical stress or deformation. Components made of fibre-reinforced ceramic composites with oxide ceramic matrix (OCMC) are currently produced in manual and price-intensive processes for small series. Therefore, the manufacturing should be improved. The ceramic injection moulding (CIM) process is established in the production of monolithic oxide ceramics. This process is characterised by its excellent automation capability. In order to realise large scale production, the CIM-process should be transferred to the production of fibre-reinforced oxide ceramics. The CIM-process enables the production of complicated component shapes and contours without the need for complex mechanical post-treatment. This means that components with complex geometries can be manufactured in large quantities.To investigate the suitability of the injection moulding process for the production of OCMCs, two different feedstocks and alumina fibres (Nextel 610) were compounded in a laboratory-scale compounder. The fibre volume fractions were varied. In a laboratory-scale injection moulding device, microbending specimens were produced from the compounds obtained in this way. To characterise the test specimens, microstructure examinations and mechanical-static tests were done. It is shown that the injection moulding process is suitable for the production of fibre-reinforced oxide ceramics. The investigations show that the feedstocks used have potential for further research work and for future applications as material components for high-temperature applications in oxidising atmospheres.

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Kramb, Victoria A., Reji John, and Larry P. Zawada. "Notched Fracture Behavior of an Oxide/Oxide Ceramic-Matrix Composite." Journal of the American Ceramic Society 82, no. 11 (December 21, 2004): 3087–96. http://dx.doi.org/10.1111/j.1151-2916.1999.tb02207.x.

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Zhong, Jie, Dongling Yang, Shuangquan Guo, Xiaofeng Zhang, Xinghua Liang, and Xi Wu. "Rear Earth Oxide Multilayer Deposited by Plasma Spray-Physical Vapor Deposition for Envisaged Application as Thermal/Environmental Barrier Coating." Coatings 11, no. 8 (July 26, 2021): 889. http://dx.doi.org/10.3390/coatings11080889.

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SiC fiber-reinforced SiC ceramic matrix composites (SiCf/SiC CMCs) are being increasingly used in the hot sections of gas turbines because of their light weight and mechanical properties at high temperatures. The objective of this investigation was the development of a thermal/environmental barrier coating (T/EBC) composite coating system consisting of an environmental barrier coating (EBC) to protect the ceramic matrix composites from chemical attack and a thermal barrier coating (TBC) that insulates and reduces the ceramic matrix composites substrate temperature for increased lifetime. In this paper, a plasma spray-physical vapor deposition (PS-PVD) method was used to prepare multilayer Si–HfO2/Yb2Si2O7/Yb2SiO5/Gd2Zr2O7 composite coatings on the surface of SiCf/SiC ceramic matrix composites. The purpose of this study is to develop a coating with resistance to high temperatures and chemical attack. Different process parameters are adopted, and their influence on the microstructure characteristics of the coating is discussed. The water quenching thermal cycle of the coating at high temperatures was tested. The results show that the structure of the thermal/environmental barrier composite coating changes after water quenching because point defects and dislocations appear in the Gd2Zr2O7 and Yb2SiO5 coatings. A phase transition was found to occur in the Yb2SiO5 and Yb2Si2O7 coatings. The failure mechanism of the T/EBC composite coating is mainly spalling when the top layer penetrates cracks and cracking occurs in the interface of the Si–HfO2/Yb2Si2O7 coating.

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Echeverria Aparicio, Itsaso, David T. Fishpool, Virtudes Rubio Diaz, Robert A. Dorey, and Julie A. Yeomans. "Evaluation of polymer matrix composite manufacturing routes for production of an oxide/oxide ceramic matrix composite." Journal of the European Ceramic Society 42, no. 5 (May 2022): 2420–28. http://dx.doi.org/10.1016/j.jeurceramsoc.2021.12.059.

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Ma, Lian-Hua, Kun Zhang, Xiao-Dong Pan, and Wei Zhou. "A comparative study of the elasto-plastic properties for ceramic nanocomposites filled by graphene or graphene oxide nanoplates." Nanotechnology Reviews 11, no. 1 (January 1, 2022): 2584–94. http://dx.doi.org/10.1515/ntrev-2022-0150.

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Abstract As nanoscale reinforcements, the graphene and graphene oxide nanoplates exhibit distinct mechanical and physical properties. The determination of the effective elasto-plastic behavior of nanoplate/ceramic nanocomposites and the different filling effects of graphene and graphene oxide nanoplate deserve systematic investigation. In this work, we intend to uncover how the graphene and graphene oxide nanoplates affect the macroscopic elasto-plastic characteristics of ceramic matrix nanocomposites and what differences in both nanoplates enhancements. A homogenization model is first utilized for determining the effective elastic parameters of nanoplate/ceramic composite with a perfect interface. Then the slightly weakened interface model is introduced to characterize the sliding effects of nanoplates in a ceramic matrix, and the effective elastic parameters of such nanoplates filled composites incorporating the interfacial sliding effects are explicitly formulated. Furthermore, a nonlinear micromechanics model is developed to investigate the macroscopic elastoplasticity and the yield behavior of graphene and graphene oxide nanoplate-filled ceramic nanocomposites subjected to confining pressure. The filling effects of the two kinds of nanoplates on the mechanical properties of such nanocomposite are comparatively examined. The calculated results demonstrate that types of the nanoplates and the imperfect interfaces between nanoplates and ceramic matrix have significant influences on the effective elasto-plastic behaviors of the nanoplate composites.

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Silvestre, J., N. Silvestre, and J. de Brito. "An Overview on the Improvement of Mechanical Properties of Ceramics Nanocomposites." Journal of Nanomaterials 2015 (2015): 1–13. http://dx.doi.org/10.1155/2015/106494.

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Due to their prominent properties (mechanical, stiffness, strength, thermal stability), ceramic composite materials (CMC) have been widely applied in automotive, industrial and aerospace engineering, as well as in biomedical and electronic devices. Because monolithic ceramics exhibit brittle behaviour and low electrical conductivity, CMCs have been greatly improved in the last decade. CMCs are produced from ceramic fibres embedded in a ceramic matrix, for which several ceramic materials (oxide or non-oxide) are used for the fibres and the matrix. Due to the large diversity of available fibres, the properties of CMCs can be adapted to achieve structural targets. They are especially valuable for structural components with demanding mechanical and thermal requirements. However, with the advent of nanoparticles in this century, the research interests in CMCs are now changing from classical reinforcement (e.g., microscale fibres) to new types of reinforcement at nanoscale. This review paper presents the current state of knowledge on processing and mechanical properties of a new generation of CMCs: Ceramics Nanocomposites (CNCs).

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12

Ramírez, Cristina, Pilar Miranzo, Maria Isabel Osendi, and Manuel Belmonte. "In Situ Graded Ceramic/Reduced Graphene Oxide Composites Manufactured by Spark Plasma Sintering." Ceramics 4, no. 1 (December 29, 2020): 12–19. http://dx.doi.org/10.3390/ceramics4010002.

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The present work merges two key strategies for the manufacturing of advanced ceramics, in particular, the development of functionally graded materials (FGMs) and the addition of graphene-based fillers into a ceramic matrix. A silicon nitride/reduced graphene oxide FGM composite is produced, in one step, from a single powder composition using the spark plasma sintering (SPS) technique with an asymmetric setting of the punches and die to create a continuous temperature gradient along the cross section of the powder compact. A deep microstructural and mechanical characterization has been done across the specimen thickness. The FGM composite exhibits bottom-top gradients in both the matrix grain size (150% increase) and α-phase content (89→1%). The FGM bottom surface is 10% harder than the top one and, on the other hand, the latter is 15% tougher. The presence of reduced graphene oxide sheets homogeneously distributed within the ceramic composite reduces the mechanical gradients compared to the monolithic silicon nitride FGM, although allows reaching a maximum long-crack toughness value of 9.4 MPa·m1/2. In addition, these graphene-based fillers turn the insulating ceramics into an electrical conductor material.

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Di Salvo, D. T., E. E. Sackett, R. E. Johnston, D. Thompson, P. Andrews, and M. R. Bache. "Mechanical characterisation of a fibre reinforced oxide/oxide ceramic matrix composite." Journal of the European Ceramic Society 35, no. 16 (December 2015): 4513–20. http://dx.doi.org/10.1016/j.jeurceramsoc.2015.08.032.

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Kaya, Cengiz, and Figen Kaya. "Processing and Characterization of Ultra-High Temperature Oxide Fiber-Reinforced Oxide Ceramic Matrix Composites with Improved Thermomechanical Properties." Key Engineering Materials 368-372 (February 2008): 1778–81. http://dx.doi.org/10.4028/www.scientific.net/kem.368-372.1778.

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A combined technique comprising electrophoretic deposition (EPD) and low-pressure infiltration was used for the fabrication of multi-layer woven mullite ceramic fabric reinforced alumina ceramic matrix composites (CMCs) for high temperature applications. Two different interface materials, NdPO4 and ZrO2 were synthesised and used for coating the woven ceramic fibres by EPD. The manufactured CMC components with suitable interface material are targeted for use at 1300-1400 oC in an oxidising atmosphere and have shown very good mechanical properties in multi-layer plate forms. Damage mechanisms, such as debonding, fibre fracture, delamination and matrix cracking within the composite plates subjected to flexural loading are analysed. It is shown that the composites with NdPO4 interface and 40 vol.% fibre loading have better mechanical properties in terms of strength and damage-tolerant behaviour. The final components produced are considered to be suitable for use as shroud seals and insulating layers for combustor chambers in aircraft engines.

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Bach, Christian, Frank Wehner, and Jan Sieder-Katzmann. "Investigations on an All-Oxide Ceramic Composites Based on Al2O3 Fibres and Alumina–Zirconia Matrix for Application in Liquid Rocket Engines." Aerospace 9, no. 11 (November 3, 2022): 684. http://dx.doi.org/10.3390/aerospace9110684.

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High performance ceramics, particularly Ceramic Matrix Composite (CMC) materials found their way into liquid rocket engines. Yet, so far, mainly carbide or nonoxide CMCs have been of interest. This paper explores the potential and challenges of oxide–oxide ceramic matrix composites (OCMCs) for application in rocket thrust chambers. Therefore, strength, leakage and hot gas tests are conducted with material samples. A particular focus lies on the application of coatings to seal the permeability inherent to the material. Furthermore, prototypes in the form of flame tubes, ceramic chambers with nozzles and ceramic chambers with graphite inlays are developed and investigated experimentally in test firings. The results show that a recrystallised glass of a Y-Al-Si-O compound can successfully create an impermeable coating of the OCMC without affecting its damag-tolerant behaviour. However, the prototype developments show that it is still very challenging to manufacture even slightly complex structures without critical failures. Nevertheless, OCMC structures of relatively simple geometries showed promising results in hot firings and could be used as a lightweight housing, while the inner contour of the chamber and nozzle are realised, e.g., by a graphite inlay of appropriate quality.

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Mosiałek, M., M. Przybyła, M. Tatko, P. Nowak, M. Dudek, and M. Zimowska. "Composite Ag-La0.8Sr0.2MnO3-σ Cathode for Solid Oxide Fuel Cells." Archives of Metallurgy and Materials 58, no. 4 (December 1, 2013): 1337–40. http://dx.doi.org/10.2478/amm-2013-0170.

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Abstract Composite cathodes for solid oxide fuel cells composed of metallic silver dispersed in ceramic (La0:8Sr0:2MnO3-σ) matrix were prepared on the surface of solid electrolyte by two-step procedure. First the matrix of controlled porosity was created by sintering mixture of La0:8Sr0:2MnO3-σ powder with the organic polymer beads then the matrix was saturated with AgNO3 solution and sintered again. Such obtained cathodes showed higher electrical conductivity and lower charge transfer resistance in oxygen reduction reaction in comparison to pure ceramic cathodes

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Chen, Z. C., R. Kulkarni, Krish K. Chawla, M. Koopman, and Kazutaka Ikeda. "Processing and Microstructure of an All-Oxide Ceramic Composite." Materials Science Forum 475-479 (January 2005): 1301–4. http://dx.doi.org/10.4028/www.scientific.net/msf.475-479.1301.

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An all-oxide composite consisting of alumina fiber, alumina matrix, and barium zirconate interphase has been investigated. The barium zirconate interphase was applied on alumina fibers through coating via a sol-gel route. The incorporation of the coatings did not significantly influence the densification behavior of the composite under hot-pressing conditions. During the processing of the composite, the barium zirconate reacted in situ with alumina fiber and alumina matrix to form Ba-β-alumina platelets with an elongated morphology, which is propitious for crack deflection and thus toughness enhancement. The results reveal that it is possible to reduce fiber strength degradation by controlling the coating and densification processes.

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van Roode, Mark, Jeff Price, Josh Kimmel, Naren Miriyala, Don Leroux, Anthony Fahme, and Kenneth Smith. "Ceramic Matrix Composite Combustor Liners: A Summary of Field Evaluations." Journal of Engineering for Gas Turbines and Power 129, no. 1 (March 1, 2005): 21–30. http://dx.doi.org/10.1115/1.2181182.

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Solar Turbines Incorporated, under U.S. government sponsored programs, has been evaluating ceramic matrix composite combustor liners in test rigs and Solar’s Centaur® 50S gas turbine engines since 1992. The objective is to evaluate and improve the performance and durability of CMCs as high-temperature materials for advanced low emissions combustors. Field testing of CMC combustor liners started in May of 1997 and by the end of 2004, over 67,000 operating hours had been accumulated on SiC∕SiC and oxide∕oxide CMC liners. NOx and CO emissions have been consistently <15ppmv and <10ppmv, respectively. Maximum test durations of 15,144h and 13,937h have been logged for SiC∕SiC liners with protective environmental barrier coatings. An oxide∕oxide CMC liner with a Friable Graded Insulation coating has been tested for 12,582h. EBCs significantly improve SiC∕SiC CMC liner life. The basic three-layer EBC consists of consecutive layers of Si, mullite, and BSAS. The durability of the baseline EBC can be improved by mixing BSAS with mullite in the intermediate coating layer. The efficacy of replacing BSAS with SAS has not been demonstrated yet. Heavy degradation was observed for two-layer Si∕BSAS and Si∕SAS EBCs, indicating that the elimination of the intermediate layer is detrimental to EBC durability. Equivalent performance was observed when the Hi-Nicalon fiber reinforcement was replaced with Tyranno ZM or ZMI fiber. Melt infiltrated SiC∕SiC CMCs have improved durability compared to SiC∕SiC CMCs fabricated by Chemical Vapor Infiltration of the matrix, in the absence of an EBC. However, the presence of an EBC results in roughly equivalent service life for MI and CVI CMCs. Results to date indicate that oxide∕oxide CMCs with protective FGI show minor degradation under Centaur® 50S gas turbine engine operating conditions. The results of, and lessons learned from CMC combustor liner engine field testing, conducted through 2004, have been summarized.

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Goushegir, Seyed M., Paula O. Guglielmi, João G. P. da Silva, Murilo P. Hablitzel, Dachamir Hotza, Hazim A. Al-Qureshi, and Rolf Janssen. "Fiber-Matrix Compatibility in an All-Oxide Ceramic Composite with RBAO Matrix." Journal of the American Ceramic Society 95, no. 1 (October 11, 2011): 159–64. http://dx.doi.org/10.1111/j.1551-2916.2011.04863.x.

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Posmyk, A., J. Myalski, and H. Wistuba. "Properties of Aluminium-Ceramic Composite with Glassy Carbon as Solid Lubricant Designed for Automotive Applications / Właściwości Kompozytu Aluminiowo Ceramicznego Zawierajacego Węgiel Szklisty Jako Smar Stały Przeznaczonego Dla Motoryzacji." Archives of Metallurgy and Materials 60, no. 4 (December 1, 2015): 2573–78. http://dx.doi.org/10.1515/amm-2015-0416.

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The paper presents some basic information on manufacturing, structure and selected properties of a new hybrid composite with an aluminium alloy matrix elaborated for automotive applications. A porous oxide ceramics constitute the reinforcing phase of the composite and glassy carbon plays the role of a solid lubricant. The properties of a composite, which contains exclusively a ceramic reinforcing phase and a hybrid composite with porous ceramics and glassy carbon, have been compared. The composite with glassy carbon, obtained by the application of new method, features uniform carbon distribution upon ceramics walls which significantly influences its tribological properties. The friction in air coefficient of a hybrid composite sliding against grey cast iron is 0.12, whereas in the case of a composite containing exclusively ceramics sliding against cast iron it amounts to 0.3.

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Lima, E. S., Luis Henrique Leme Louro, José Brant de Campos, R. R. de Avillez, Sérgio Neves Monteiro, and Célio Albano da Costa. "Processing and Characterization of Al₂O₃-YAG Composite." Materials Science Forum 727-728 (August 2012): 1334–39. http://dx.doi.org/10.4028/www.scientific.net/msf.727-728.1334.

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Oxide ceramics show better oxidation resistance at high temperatures than other ceramics; however they are more susceptible to plastic deformation at elevated temperatures [. If their high temperature mechanical properties could be improved, they would be expected to open a wide range of applications as structural material [2, 3]. Several studies have revealed [4, 5] the potential use of YAG oxides as reinforcing component oxide in a ceramic matrix. Both YAG and Al2O3 have similar thermal expansion coefficient and they are chemically stable because of their low O2 vapor pressure. In addition, there is no solid state phase transition as the temperature rises, but the eutectic reaction at 1826°C with Al2O3 molar concentration of 81.5% and 18.5% for Y2O3 which enable a fusion processing, turning the Al2O3-YAG composites very attractive. This eutectic reaction is possible in the restrictive composition from 18.5 to 20.5 mol% Y2O3 [6].

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Liu, Yizhang, Xiaosong Jiang, Junli Shi, Yi Luo, Yijuan Tang, Qiong Wu, and Zhiping Luo. "Research on the interface properties and strengthening–toughening mechanism of nanocarbon-toughened ceramic matrix composites." Nanotechnology Reviews 9, no. 1 (March 12, 2020): 190–208. http://dx.doi.org/10.1515/ntrev-2020-0017.

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AbstractNanocarbon materials (carbon nanotubes, graphene, graphene oxide, reduced graphene oxide, etc.) are considered the ideal toughening phase of ceramic matrix composites because of their unique structures and excellent properties. The strengthening and toughening effect of nanocarbon is attributed to several factors, such as their dispersibility in the matrix, interfacial bonding state with the matrix, and structural alteration. In this paper, the development state of nanocarbon-toughened ceramic matrix composites is reviewed based on the preparation methods and basic properties of nanocarbon-reinforced ceramic matrix composites. The assessment is implemented in terms of the influence of the interface bonding condition on the basic properties of ceramic matrix composites and the methods used to improve the interface bonding. Furthermore, the strengthening and toughening mechanisms of nanocarbon-toughened ceramic matrix composites are considered. Moreover, the key problems and perspectives of research work relating to nanocarbon-toughened ceramic matrix composites are highlighted.

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DiCarlo, J. A., and H. M. Yun. "Modeling the Thermostructural Capability of Continuous Fiber-Reinforced Ceramic Composites." Journal of Engineering for Gas Turbines and Power 124, no. 3 (June 19, 2002): 465–70. http://dx.doi.org/10.1115/1.1470480.

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There exists today considerable interest in developing continuous fiber-reinforced ceramic matrix composites (CMC) that can operate as hot-section components in advanced gas turbine engines. The objective of this paper is to present simple analytical and empirical models for predicting the effects of time and temperature on CMC tensile rupture under various composite and engine conditions. These models are based on the average rupture behavior measured in air for oxide and SiC-based fibers of current technical interest. For example, assuming a cracked matrix and Larson-Miller rupture curves for single fibers, it is shown that model predictions agree quite well with high-temperature stress-rupture data for SiC/SiC CMC. Rupture models, yet to be validated, are also presented for three other relevant conditions: (a) SiC fibers become oxidatively bonded to each other in a cracked CMC, (b) applied CMC stresses are low enough to avoid matrix cracking, and (c) Si-based CMC are subjected to surface recession in high-temperature combustion gases. The practical implications of the modeling results are discussed, particularly in regard to the optimum fibers and matrices for CMC engine applications and the thermostructural capability of SiC/SiC CMC in comparison to nickel-based superalloys, monolithic ceramics, and oxide/oxide CMC.

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Hassan, Azzam D., Usama J. Naeem, and Imad O. Bachi. "Processing and Evaluation of Ceramic Filler Reinforced Polymer Matrix Composites." Journal of Physics: Conference Series 2361, no. 1 (October 1, 2022): 012009. http://dx.doi.org/10.1088/1742-6596/2361/1/012009.

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Tensile strength, Young modulus, impact strength, creep resistance, recovery measures, and thermal conductivity are used to evaluate the polymer matrix composite containing ceramic particles as degradation of spongy iron by oxidation to a ferric oxide which is used in steelmaking and low-density polyethylene. The results reveal that the mechanical and thermal properties are affected by the ratio of filler particles (360 μm). Six specimens were prepared and tested in time-dependent conditions at a constant temperature. As a result, increasing the filler ratio added to low-density polyethylene does not accelerate creep with nonlinear viscoelastic behavior. The composite with 0.7 percent ferric oxide particles was found to have the best thermal and mechanical qualities.

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Glukharev, Artem, Oleg Glumov, Ivan Smirnov, Evgeniy Boltynjuk, Olga Kurapova, and Vladimir Konakov. "Phase Formation and the Electrical Properties of YSZ/rGO Composite Ceramics Sintered Using Silicon Carbide Powder Bed." Applied Sciences 12, no. 1 (December 24, 2021): 190. http://dx.doi.org/10.3390/app12010190.

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Fully stabilized zirconia/graphene composites are very promising advanced structural materials having mixed ion–electron conductivity for energy storage and energy conversion applications. The existing methods of the composite manufacturing have a number of disadvantages that limit their practical use. Thus, the search for new sintering methods is an actively developing area. In this work, we report for the first time the application of the SiC powder bed sintering technique for fully stabilized zirconia (YSZ) composite fabrication. The reduced graphene oxide (rGO) was used as a graphene derivative. As a result, well-formed ceramics with high density and crystallinity, the maximal microhardness of 13 GPa and the values of the ionic conductivity up to 10−2 S/cm at 650 °C was obtained. The effects of the sintering conditions and rGO concentration on the microstructure and conductivities of ceramics are discussed in detail. The suggested powder bed sintering technique in a layered graphite/SiC/graphite powder bed allowed well-formed dense YSZ/rGO ceramics fabrication and can become a suitable alternative to existing methods for various oxide ceramic matrix composite fabrication: both conventional sintering and non-equilibrium (SPS, flash sintering) approaches.

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Spyrka, M., R. Atraszkiewicz, and L. Klimek. "A new ceramic composite based on spherical aluminium oxide for auxiliary panels in high-temperature firing processes." Archives of Materials Science and Engineering 1, no. 101 (January 1, 2020): 5–14. http://dx.doi.org/10.5604/01.3001.0013.9501.

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based on a spherical form of aluminium oxide. It is intended to limit the occurrence of technological problems related to the appropriate selection of auxiliary refractory materials, such as cracking, high heat capacity and variable coefficient of thermal expansion. Design/methodology/approach: A composite ceramic material with the spherical form of aluminium oxide included allows to reduce mass and stabilize characteristics of dimensional changes as a function of temperature in auxiliary panels in high-temperature firing processes with typical manufacturing process of the ceramics, which is gravity casting, drying and high-temperature firing. Findings: The study showed that the quantitative share of the spherical form of Al2O3 in the volume of ceramic material has a major impact on its properties. An increased share of spheres translates into greater material porosity and lower matrix density but also, by reducing the cross-section, into decreased strength properties. In the case of the developed ceramic material, there is no visible trend of a decrease in the coefficient of thermal expansion with increasing temperature, which is the case with traditional ceramic materials. Research limitations/implications: The strength of presented composite isn’t good and constitutes a further direction of research and development of the material. Practical implications: Although decreased strength properties, the composite with no visible trend of a decrease in the coefficient of thermal expansion with increasing temperature could be used as panels in high-temperature firing processes. Originality/value: New ceramic foundry composite based on a spherical form of aluminium oxide for auxiliary panels in high temperature processes.

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Schoell, Ryan, Aspen Reyes, Guddi Suman, Mila Nhu Lam, Justin Hamil, Samantha G. Rosenberg, LaRico Treadwell, Khalid Hattar, and Eric Lang. "Hot Isostatic Pressing Control of Tungsten-Based Composites." Inorganics 11, no. 2 (February 16, 2023): 82. http://dx.doi.org/10.3390/inorganics11020082.

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Metal-oxide composites are commonly used in high temperature environments for their thermal stability and high melting points. Commonly employed with refractory oxides or carbides such as ZrC and HfC, these materials may be improved with the use of a low density, high melting point ceramic such as CeO2. In this work, the consolidation of W-CeO2 metal matrix composites in the high CeO2 concentration regime is explored. The CeO2 concentrations of 50, 33, and 25 wt.%, the CeO2 particle size from nanometer to micrometer, and various hot isostatic pressing temperatures are investigated. Decreasing the CeO2 concentration is observed to increase the composite density and increase the Vickers hardness. The CeO2 oxidation state is observed to be a combination of Ce3+ and Ce4+, which is hypothesized to contribute to the porosity of the composites. The hardness of the metal-oxide composite can be improved more than 2.5 times compared to pure W processed by the same route. This work offers processing guidelines for further consolation of oxide-doped W composites.

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Singh, Abhendra K., Volodymyr Sabelkin, and Shankar Mall. "Creep-rupture behaviour of notched oxide/oxide ceramic matrix composite in combustion environment." Advances in Applied Ceramics 117, no. 1 (August 11, 2017): 30–41. http://dx.doi.org/10.1080/17436753.2017.1359444.

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Vasechko, Viacheslav, Ferdinand Flucht, and Nils Rahner. "Mechanical investigation of weak regions in a wound oxide-oxide ceramic matrix composite." Journal of the European Ceramic Society 38, no. 15 (December 2018): 5192–99. http://dx.doi.org/10.1016/j.jeurceramsoc.2018.05.009.

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Mirovoy, Yu A., A. G. Burlachenko, A. S. Buyakov, E. S. Dedova, and S. P. Buyakova. "Effect of carbon nanotubes on the microstructure and fracture resistance of nanostructured oxide ceramics." Izvestiya vysshikh uchebnykh zavedenii. Fizika, no. 3 (2021): 21–26. http://dx.doi.org/10.17223/00213411/64/3/21.

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The structure and properties of ceramics based on zirconium dioxide stabilized yttrium oxide with the addition of high-modulus inclusions of carbon nanotubes were investigated. The composite materials were obtained by spark plasma sintering. The introduction of carbon nanotubes provides a slight decrease in the density and grain size of ceramics. Growth of volume fraction of carbon nanotubes leads to increase of mechanical properties of ceramic composites. The highest values of mechanical properties were obtained by the introduction of 5 vol.% of carbon nanotubes and were E = (246±8) GPa, H = (12.7±0.21) GPa, K 1 CI = (12.1±0.35) MPa∙m1/2, K 1 CN = (7.8±0.29) MPa∙m1/2. The increase of fracture toughness when carbon nanotubes are introduced into the ceramic matrix is caused by two dissipative mechanisms - phase transformation from tetragonal to monoclinic modification of ZrO2 and crack bridging. As the amount of introduced additive increases, the contribution of martensitic transformation in fracture resistance decreases, which is associated with a decrease in the grain size of the tetragonal zirconium dioxide phase and, accordingly, its transition to a stable state.

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Бобылев, С. В. "Влияние выдергивания графеновых пластин из керамической матрицы на трещиностойкость композитов керамика/графен." Физика твердого тела 64, no. 6 (2022): 691. http://dx.doi.org/10.21883/ftt.2022.06.52400.306.

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A theoretical model is proposed that describes the effect of graphene platelets pullout on the fracture toughness of ceramic/graphene composites. The dependences of fracture toughness on the graphene concentration and the dimensions of graphene platelets are calculated using a stabilized zirconium oxide (YSZ)/graphene composite as an example. Calculations predict that if graphene platelets pullout from ceramic matrix is the dominant mechanism, then the maximum fracture toughness is achieved in the case of the longest and thinnest possible graphene platelets, provided that the latter have sufficient strength and adhesion to the matrix. The model shows a good correlation with experimental data at low graphene concentrations.

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Chmielewski, M., J. Dutkiewicz, D. Kalinski, L. Litynska-Dobrzynska, K. Pietrzak, and A. Strojny-Nedza. "Microstructure and properties of hot-pressed molybdenum-alumina composites." Archives of Metallurgy and Materials 57, no. 3 (October 1, 2012): 687–93. http://dx.doi.org/10.2478/v10172-012-0074-8.

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Brittleness is the main technical limitation on a wide use of advanced ceramic materials. To overcome this problem, ceramic-metal composites are commonly applied. A principal advantage of ceramic-metal composite materials is their higher resistance to brittle fracture. An increase of fracture toughness depends on the type, amount, size and shape of a metallic component. The metallic phase can additionally modify physical, mechanical and thermal properties of materials. The results of experiments concerning a manufacturing process of Mo-Al2O3 composite materials obtained by the hot pressing method were presented. Two powder mixtures with different volume fraction of aluminium oxide were prepared in a planetary ball mill. The hot pressing process allowed to obtain well-densified metal matrix composites (~99% of a theoretical density). Microstructural observations of sinters were conducted using scanning electron microscopy, energy-dispersive X-ray spectroscopy, and transmission electron microscopy. Very stable bonding between metal and ceramic grains was observed. Complex investigations of the physical and mechanical properties of obtained molybdenum-alumina composite materials seem to be very promising from an application point of view.

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Isabell, T. C., V. P. Dravid, and D. N. Hill. "Electron Microscope investigation of crack path selection and crack interface interactions in a W-ZrO2(Y2O3) directionally solidified eutectic (DSE)." Proceedings, annual meeting, Electron Microscopy Society of America 53 (August 13, 1995): 186–87. http://dx.doi.org/10.1017/s0424820100137306.

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Metal-ceramic composites play a vital materials role in many technologically important industries due to their unique electrical, thermal and structural properties. The mechanical properties of metal-oxide materials are largely controlled by the properties of the metal-ceramic interface, specifically its structure and chemistry which govern the bonding between the constituents. For a brittle matrix composite, the fracture properties of the interface can determine the failure response of the composite as a whole.The W-ZrO2(Y2O3) directionally solidified eutectic was grown by a skull melting technique described elsewhere. Composites were grown with 10 mol % yttria and ~ 6 w% tungsten. Figure 1 is a scanning electron micrograph showing that the tungsten grows as parallel fibers approximately lujn in diameter in a zirconia matrix. Selected area diffraction of the composite (Figure 2) reveals the growth direction to be: <110>zrO2 // <11l>w.Electron microscopy of microindentation cracks, of pre-existing microcracks due to thermal expansion anisotropy and of short cracks inadvertently introduced during specimen preparation shows four different crack-interface interactions:

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Ayvaz, Mehmet, and Hakan Cetinel. "Mechanical properties of Al-Cu/B4C and Al-Mg/B4C metal matrix composites." Materials Testing 63, no. 4 (April 1, 2021): 350–55. http://dx.doi.org/10.1515/mt-2020-0052.

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Abstract To be able to successfully produce ceramic-reinforced aluminum matrix composites by using the powder metallurgy method, the wetting of ceramic reinforcements should be increased. In addition, the negative effects of the oxide layer of the aluminum matrix on sinterability should be minimized. In order to break the oxide layer, the deoxidation property of Mg can be used. Furthermore, by creating a liquid phase, both wettability and sinterability can be improved. In this study, the effects of Mg and Cu alloy elements and sintering phase on the wettability, sinterability, and mechanical properties of Al/B4C composites were investigated. For this purpose, various amounts (5, 10, 20, and 30 wt.-%) of B4C reinforced Al5Cu and Al5Mg matrix composites were produced by the powder metallurgy method. After pressing under 400 MPa pressure, composite samples were sintered for 4 hours. The sintering was carried out in two different groups as solid phase sintering at 560 °C and liquid phase sintering at 610 °C. Despite the deoxidation effect of Mg in Al5Mg matrix composites, higher mechanical properties were determined in Al5Cu composites which were sintered in liquid phase because wettability increased. The highest mechanical properties were obtained in the 20 wt.-% B4C reinforced Al5Cu sample sintered in liquid phase.

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Guedes, Mafalda, José Maria F. Ferreira, and Alberto C. Ferro. "A Study on CuO-Al₂O₃ Infiltration by Aluminium." Materials Science Forum 636-637 (January 2010): 571–77. http://dx.doi.org/10.4028/www.scientific.net/msf.636-637.571.

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This paper reports preliminary studies regarding a new fabrication process for aluminium alloy matrix particulate reinforced composites, which uses ceramic preforms with alumina and tailored amounts of reactive copper oxide, CuO. An Al2O3-CuO mixture with 75 mol% CuO was selected, aiming at a 10-40vol% reinforcement phase fraction in the final composite, after aluminium infiltration. Molten aluminium infiltration progress was studied as a function of ceramic’s composition, doping, and infiltration time. The resulting microstructures were investigated by OM, SEM, FESEM and EDS in order to establish the liquid aluminium infiltration profile at the metal/ceramic interface. Infiltration experiments showed that the 3CuO (s) + 2Al (l) → 3Cu (l) + Al2O3 (s) redox reaction is triggered at the experimental conditions used, but the infiltration process is slow and does not go to completion. The use of NaOH as a doping agent promotes effective infiltration of molten aluminium upon the ceramic green mixture.

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Lombardi, Mariangela, Paolo Fino, and Laura Montanaro. "Influence of ceramic particle features on the thermal behavior of PPO-matrix composites." Science and Engineering of Composite Materials 21, no. 1 (January 1, 2014): 23–28. http://dx.doi.org/10.1515/secm-2012-0139.

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AbstractThermoplastic poly(phenylene oxide) (PPO)-matrix composites were prepared and characterized in order to evaluate the effect of different ceramic fillers on the thermal and combustion behavior of the matrix. In particular, ceramic particles having three different shapes were exploited as fillers, particles showing a platelet-like, a needle-like or an equiaxial morphology. The composite materials were produced through a melt blending method, which yielded a homogeneous distribution of the ceramic particles in the organic matrix. It was demonstrated that the presence of the inorganic particles influenced the temperature range in which the degradation processes of the polymer occurred. In addition, the three fillers modified the thermal behavior of PPO differently in terms of enthalpy. Finally, the presence of the filler induced a change in combustion behavior of the polymeric matrix; in particular, sepiolite was able to increase the charring ability of the PPO/polystyrene blend with the development of a visible carbonaceous layer.

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Ahmadi, Majid, Seyed Hadi Seyedin, and Seyed Vahid Seyedin. "Investigation of the mechanical performance of fiber-modified ceramic composites using finite element method." Tehnički glasnik 13, no. 3 (September 24, 2019): 173–79. http://dx.doi.org/10.31803/tg-20181006143504.

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Ceramic materials are widely used in impact safekeeping systems. Ceramic is a heterogeneous material; its characteristics depend considerably both on specifications of its ingredients and the material structure completely. The finite element method (FEM) can be a useful tool for strength computation of these materials. In this paper, the mechanical properties of the ceramic composites are investigated, and the mechanical performance modeling of fiber-fortified ceramic matrix composites (CMC) is expressed by the instance of aluminum oxide fibers in a matrix composite based on alumina. The starting point of the modeling is an infrastructure (primary cell) that contains a micromechanical size, the statistical analysis characteristics of the matrix, fiber-matrix interface, fiber, and their reciprocal influences. The numeral assessment of the model is done using the FEM. The numerical results of composite elastic modulus were computed based on the amount of the added fibers and the porosity was evaluated for empirical data of samples with a similar composition. Various scanning electron microscope (SEM) images were used for each sample to specify the porosity. Also, the unit cell method presumed that the porous ceramic substance is manufactured from an array of fundamental units, each with the same composition, material characteristic, and cell geometry. The results showed that when the material consists of different pores and fibers, the amount of Young’s modulus reduces with the increment of porosity. The linear correlation model of elasticity versus porosity value from experimental data was derived by MATLAB curve fitting. The experimental data from the mechanical test and numerical values were in good agreement.

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Li, Jie Wen, Xi Wei, Wei Gang Zhang, and Min Ge. "Preparation and Microstructure Characterizations of Novel C/C-Zr(Hf)B₂-Zr(Hf)C-SiC Composites." Materials Science Forum 788 (April 2014): 593–97. http://dx.doi.org/10.4028/www.scientific.net/msf.788.593.

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A series of novel C/C-Zr (Hf)B2-Zr (Hf)C-SiC composites were prepared by chemical vapor infiltration (CVI) of pyrolytic carbon and polymeric impregnation and pyrolysis (PIP) with hybrid polymeric precursors of SiC (polycarbosilane), Zr (Hf)C and Zr (Hf)B2 in carbon fiber preforms. The formed ultra-high temperature ceramics (UHTCs) matrix of SiC-ZrC-ZrB2 and SiC-HfC-HfB2 were designed to improve the oxidation resistance of carbon/carbon composite at very high temperatures above 2000°C. The pyrolysis process of Zr (Hf)C and Zr (Hf)B2 polymeric precursors was investigated, and the results showed that the hybrid precursors could be successfully transformed into Zr (Hf)C and Zr (Hf)B2 ceramic particles with the sizes of nanometer with temperatures above 1500°C. Furthermore, the multiscale structure of C/C-Zr (Hf)B2-Zr (Hf)C-SiC composites were also characterized , showing that the carbon fibers were covered by pyrolytic carbon, and the continuous ceramic matrix was well dispersed, formed by Zr (Hf)C and Zr (Hf)B2 nanoparticles distributing homogeneously in the continuous SiC matrix. This homogeneous dispersion of composite ceramics of Zr (Hf)C and Zr (Hf)B2 with SiC plays excellent protection of C/C composites from oxidation at high temperature via formation of stable oxides coatings.

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Lee, Sang Jin, Chung Hyo Lee, and Jong Hee Hwang. "Toughening of Ceramic Composite Designed by Silica-Based Transformation Weakening Interphases." Key Engineering Materials 287 (June 2005): 358–66. http://dx.doi.org/10.4028/www.scientific.net/kem.287.358.

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A new concept for achieving graceful failure in oxide composites is introduced. It is based on crack deflection in a weak interphase between a matrix and reinforcement (e.g. fiber), or in a laminated composite. The interphase can be phase transformation weakened by volume contraction and/or unit cell shape change. Microcracking induced by a displacive, crystallographic phase transformation in silica-based interphases resulted in increase in the toughness of the bulk composites. In the present study, mullite/cordierite laminates with b®a-cristobalite (SiO2) transformation weakened interphase, and alumina matrix fibrous monolith with metastable hexacelsian (BaAl2Si2O8) interphases were investigated for interphase debonding behavior. In mechanical test, the laminates showed step-wise load drop behavior dependent on a grain size of b-cristobalite. In particular, in the fibrous monolith design, the load-deflection curve showed unusual plastic-like behavior with reasonable work of fracture.

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Camacho, N., J. F. May-Crespo, J. B. Rojas-Trigos, K. Martinez, E. Marin, and G. C. Mondragon-Rodriguez. "Thermal properties and degradation kinetics of epoxy-γ-alumina and epoxy-zinc oxide light weight composites." Revista Mexicana de Física 66, no. 4 Jul-Aug (July 1, 2020): 479. http://dx.doi.org/10.31349/revmexfis.66.479.

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Lightweight composite materials are the gold standard in aeronautical and aerospace applications due to their strength and low mass. To carry higher payloads and decrease launching costs, nanosatellites lightweight. Additionally, nanosatellites must also resist high thermal radiation loads while working in orbit. Polymer-based composite materials maintain low mass and added reinforcing ceramic fillers contributes to increasing radiation resistance, thus producing composites that meet both requirements. In this work, the effects of γ-alumina (Al2O3) and zinc oxide (ZnO) micro- and nanoparticles on the thermal properties and degradation kinetics of epoxy-based composites were investigated. The effective thermal conductivity improved up to 17.8 % for epoxy/γ-Al2O3 and 27.4 % for epoxy/ZnO. The effective thermal diffusivity values show a monotonic decreasing behavior as a function of the particle concentration for the epoxy/γ-Al2O3 composites; for the epoxy/ZnO composites, no correlation on the effective thermal diffusivity values with the ZnO-content was observed. Both oxide-based ceramic fillers increase the thermal stability of epoxy up to 250 °C; however, γ-Al2O3 decreased the maxima decomposition temperature of the epoxy matrix by 6°C. Zinc oxide did not affect the maxima decomposition temperature but decreased the activation energy of epoxy by ~ 45 %. These results provide a feasible manufacturing method for epoxy-based composite materials (i.e. nanosatellites) where efficient heat transfer, heat resistance, and low mass are required.

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Broutelle, Marion, Frédéric Lachaud, Ludovic Barrièrre, Alain Daidié, Alexandre Chardonneau, and Florent Bouillon. "Bearing damage identification in oxide/oxide ceramic matrix composite with a new test design." Composite Structures 236 (March 2020): 111902. http://dx.doi.org/10.1016/j.compstruct.2020.111902.

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42

Hass, D. D., and H. N. G. Wadley. "A Dielectric Sensing Approach for Controlling Matrix Composition During Oxide-Oxide Ceramic Composite Processing." Journal of Nondestructive Evaluation 30, no. 2 (February 24, 2011): 81–90. http://dx.doi.org/10.1007/s10921-011-0093-9.

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Posmyk, A., J. Myalski, and B. Hekner. "Glassy Carbon Coating Deposited on Hybrid Structure of Composite Materials." Archives of Metallurgy and Materials 61, no. 2 (June 1, 2016): 1045–50. http://dx.doi.org/10.1515/amm-2016-0176.

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AbstractThis paper presents a method of production metal matrix composites with aluminum oxide foam covered by glassy carbon layer used as reinforcement. The glassy carbon coating was formed for decreasing of friction coefficient and reducing the wear. In first step of technology liquid glassy carbon precursor is on ceramic foam deposited, subsequently cured and carbonated at elevated temperature. In this way ceramic foam is covered with glassy carbon coating with thickness of 2-8 μm. It provides desirable amount of glassy carbon in the structure of the material. In the next step, porous spheres with carbon coating are infiltrated by liquid matrix of Al-Cu-Mg alloy. Thereby, equable distribution of glassy carbon in composite volume is achieved. Moreover, typical problems for composites reinforced by particles like sedimentation, agglomeration and clustering of particles are avoided. Tribological characteristics during friction in air versus cast iron as a counterpart were made. Produced composites with glassy carbon layer are characterised by friction coefficient between 0.08-0.20, thus meeting the typical conditions for solid lubricants.

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MECHNICH, Peter. "Slurry-based protective coatings for Oxide/Oxide ceramic matrix composites." Journal of the Ceramic Society of Japan 129, no. 1 (January 1, 2021): 32–39. http://dx.doi.org/10.2109/jcersj2.20166.

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Ramachandran, Karthikeyan, Subhashree Leelavinodhan, Christian Antao, Antony Copti, Cantalapiedra Mauricio, Yelisetti Lakshmi Jyothi, and Doni Daniel Jayaseelan. "Analysis of failure mechanisms of Oxide - Oxide ceramic matrix composites." Journal of the European Ceramic Society 42, no. 4 (April 2022): 1626–34. http://dx.doi.org/10.1016/j.jeurceramsoc.2021.11.020.

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Tye, A., and M. H. Lewis. "Evaluation of novel interphases for oxide/oxide ceramic matrix composites." British Ceramic Transactions 98, no. 6 (June 1999): 286–90. http://dx.doi.org/10.1179/096797899680606.

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47

Posmyk, A., and H. Wistuba. "Composite Layers with Ceramic Matrix Modified with Glassy Carbon Destined for Oil-Less Sliding Pairings." Archives of Metallurgy and Materials 56, no. 4 (December 1, 2011): 909–17. http://dx.doi.org/10.2478/v10172-011-0100-2.

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Composite Layers with Ceramic Matrix Modified with Glassy Carbon Destined for Oil-Less Sliding Pairings The paper presents basic knowledge about producing and some results of tribological and metallographical research on composite layers with porous, anodic hard coating matrix which were modified with glassy carbon nanotubes. These composite layers were formed as surface layers of machine parts operating under conditions of sparse lubrication (limited lubrication) and friction in air. The layers were tested at sliding mating with EN-GJL-350 cast iron used for piston rings in combustion engines and air compressors. On the basis of the metallographical tests was the structure of the composite layer described. It was fount that on the surface of the oxide is a glassy carbon layer and in the pores of oxide are regullary carbon nanotubes. On the basis of the obtained results of tribological tests it was found that glassy carbon layer on the oxide surface shorts the wering-in time, and the glassy carbon nanotubes formed inside the pores of anodic hard coating upon EN-AW-6061 aluminum alloy prove to be effective solid lubricants and complement lubrication function of the graphite in cast iron. Consequently the coefficient of friction was lower than in case of nanotubes-free oxide layers.

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48

Shin, Hyun-Ho, Yolande Berta, and Robert F. Speyer. "Effect of processing temperature on interfacial layer formation in SiC fiber-reinforced glass-ceramic composites." Proceedings, annual meeting, Electron Microscopy Society of America 50, no. 1 (August 1992): 62–63. http://dx.doi.org/10.1017/s0424820100120710.

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The high fracture toughness and non-catastrophic fracture behavior of fiber-reinforced ceramic matrix composites are due to the weak interfacial shear strength between fiber and matrix, permitting fiber-matrix sliding during failure. In SiC fiber-reinforced glass or glass-ceramic composites, such low interfacial shear strength is obtained by the presence of a carbon-rich interfacial layer. This provides a path for crack propagation, fiber pull-out, and fiber delamination during fracture. Hence, these composites have demonstrated very high fracture toughness (critical stress intensity factor of ∼ 17 MPam1/2) and high fracture strength (3 to 4 times larger than that of monolithic glass or glass-ceramics). The carbon-rich interfacial layer in these glass or glass-ceramic composites is formed by oxidation of the SiC fiber by the oxide matrix during hot pressing. Its thickness is governed by hot pressing time, temperature, and pressure. In our results on Nicalon SiC fiber-reinforced lithium aluminosilicate glass-ceramic composites, hot pressing temperature governed not only the thickness of the interfacial layer, but also the phases residing within it. In this paper, the effect of hot pressing temperature on the phases formed in the interfacial area is described.

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Costa, Ulisses Oliveira, Lucio Fabio Cassiano Nascimento, Julianna Magalhães Garcia, Sergio Neves Monteiro, Fernanda Santos da Luz, Wagner Anacleto Pinheiro, and Fabio da Costa Garcia Filho. "Effect of Graphene Oxide Coating on Natural Fiber Composite for Multilayered Ballistic Armor." Polymers 11, no. 8 (August 16, 2019): 1356. http://dx.doi.org/10.3390/polym11081356.

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Composites with sustainable natural fibers are currently experiencing remarkably diversified applications, including in engineering industries, owing to their lower cost and density as well as ease in processing. Among the natural fibers, the fiber extracted from the leaves of the Amazonian curaua plant (Ananas erectifolius) is a promising strong candidate to replace synthetic fibers, such as aramid (Kevlar™), in multilayered armor system (MAS) intended for ballistic protection against level III high velocity ammunition. Another remarkable material, the graphene oxide is attracting considerable attention for its properties, especially as coating to improve the interfacial adhesion in polymer composites. Thus, the present work investigates the performance of graphene oxide coated curaua fiber (GOCF) reinforced epoxy composite, as a front ceramic MAS second layer in ballistic test against level III 7.62 mm ammunition. Not only GOCF composite with 30 vol% fibers attended the standard ballistic requirement with 27.4 ± 0.3 mm of indentation comparable performance to Kevlar™ 24 ± 7 mm with same thickness, but also remained intact, which was not the case of non-coated curaua fiber similar composite. Mechanisms of ceramic fragments capture, curaua fibrils separation, curaua fiber pullout, composite delamination, curaua fiber braking, and epoxy matrix rupture were for the first time discussed as a favorable combination in a MAS second layer to effectively dissipate the projectile impact energy.

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Mogilevsky, P., and A. Zangvil. "Kinetics of oxidation in oxide ceramic matrix composites." Materials Science and Engineering: A 354, no. 1-2 (August 2003): 58–66. http://dx.doi.org/10.1016/s0921-5093(02)00872-9.

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Journal articles on the topic 'Oxide Ceramic Matrix Composite'

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