Relevant bibliographies by topics / Spray-fused coatings

Academic literature on the topic 'Spray-fused coatings'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Spray-fused coatings"

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Kulu, P., T. Pihl, K. Tammjärv, and P. Vuoristo. "Formation of microstructure of spray-fused powder coatings." Proceedings of the Estonian Academy of Sciences. Engineering 8, no. 1 (2002): 38. http://dx.doi.org/10.3176/eng.2002.1.03.

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Kulu, P. A., and Ya A. Khalling. "Flame spray coatings on powder metallurgy materials. II. Fused powder coatings." Soviet Powder Metallurgy and Metal Ceramics 25, no. 9 (September 1986): 752–56. http://dx.doi.org/10.1007/bf00797308.

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Sarma, B. Y., and M. M. Mayuram. "Some Studies on Life Prediction of Thermal Sprayed Coatings Under Rolling Contact Conditions." Journal of Tribology 122, no. 3 (October 13, 1999): 503–10. http://dx.doi.org/10.1115/1.555393.

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Design of engineering components is concerned with their strength and durability characteristics. While design for strength is influenced by the bulk material characteristics, the design for durability is dependant on the surface characteristics. Majority of the component failures are surface originated. Surface engineering could play a vital role in minimizing such failures. Thermal sprayed coatings, one of the versatile surface coating techniques, can be applied to components of machinery surfaces to avoid such failures. The present paper presents a methodology for contact stress evaluation of surface coated elements, adopting a layered structure approach, and thereby analytically predict their spalling life. Further data on cycles to single pit formation, and spalling of spray fused coatings obtained from experimental testing are presented for assessing the applicability of life prediction models to layered structures such as sprayed coatings. Experimental investigations were conducted on spray fused coatings using a twin disk RCF test setup. The surface and subsurface contact stress distribution have been obtained analytically by Smith–Liu equations along with first order model perturbation method (FOMP), to account for the variation of elastic modulus constants of the layered structure. Applying Lundberg-Palmgren and Tallian life prediction models, the spalling life of these coatings has been predicted analytically and compared with experimental life values. [S0742-4787(00)02502-9]
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SAREMI, MOHSEN, AHMAD KEYVANI, and MAHMOUD HEYDARZADEH SOHI. "HOT CORROSION RESISTANCE AND MECHANICAL BEHAVIOR OF ATMOSPHERIC PLASMA SPRAYED CONVENTIONAL AND NANOSTRUCTURED ZIRCONIA COATINGS." International Journal of Modern Physics: Conference Series 05 (January 2012): 720–27. http://dx.doi.org/10.1142/s201019451200267x.

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Conventional and nanostructured zirconia coatings were deposited on In-738 Ni super alloy by atmospheric plasma spray technique. The hot corrosion resistance of the coatings was measured at 1050°C using an atmospheric electrical furnace and a fused mixture of vanadium pent oxide and sodium sulfate respectively. According to the experimental results nanostructured coatings showed a better hot corrosion resistance than conventional ones. The improved hot corrosion resistance could be explained by the change of structure to a dense and more packed structure in the nanocoating. The evaluation of mechanical properties by nano indentation method showed the hardness (H) and elastic modulus (E) of the YSZ coating increased substantially after hot corrosion.
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Heath, G. R., and P. A. Kammer. "Fabrication of Graded, Spray, and Fused Coatings and Their High Temperature Erosion Performance." Materials and Manufacturing Processes 11, no. 5 (September 1996): 847–54. http://dx.doi.org/10.1080/10426919608947531.

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Vardavoulias, Michail, Paraskevi Gkomoza, Michael Arkas, Dimitrios K. Niakolas, and Stylianos G. Neophytides. "Thermal Spray Multilayer Ceramic Structures with Potential for Solid Oxide Cell Applications." Coatings 11, no. 6 (June 5, 2021): 682. http://dx.doi.org/10.3390/coatings11060682.

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The objective of this paper is to manufacture free-standing solid oxide cells (SOCs) through the atmospheric plasma spray process (APS), without the aid of a metallic support nor the need for a post-process heating treatment. A five-layered cell was fabricated. Fused and crushed yttria-stabilized zirconia (YSZ) powder in the 5–22 μm particle size range was used in order to achieve a dense electrolyte layer, yet still permitting satisfactory ionic diffusivity. Nickel oxide (NiO) powder that was obtained by in-house flame spray (FS) oxidation of pure nickel (Ni) powder was mixed and sprayed with the original Ni-YSZ feedstock, so as to increase the porosity content in the supporting electrode. Two transition layers were sprayed, the first between the support electrode and the electrolyte (25% (Ni/NiO)–75% YSZ) and the second at the electrolyte and the end electrode interface (50% YSZ–50% lanthanum strontium manganite (LSM)). The purpose of intercalation of these transition layers was to facilitate the ionic motion and also to eliminate thermal expansion mismatches. All the as-sprayed layers were separately tested by an in-house developed acetone permeability comparative test (APCT). Electrodes with adequate porosity (25–30%) were obtained. Concerning electrolytes, relatively thick (150–200 µm) layers derived from fused and crushed YSZ were found to be impermeable to acetone, while thinner YSZ counterparts of less than 100 µm showed a low degree of permeability, which was attributed mostly to existent microcracks and insufficient interparticle cohesion, rather than to interconnected porosity.
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Zhang, Wenmin, Cheng Peng, Defang Liu, Yangfang Cheng, and Jianqing Wu. "Preparation of fused silica membrane with high performance for high temperature gas filtration by sealing and spray coating." Ceramics International 45, no. 9 (June 2019): 11607–14. http://dx.doi.org/10.1016/j.ceramint.2019.03.032.

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Ayouchi, R., F. Mart�n, J. R. Ramos-Barrado, and D. Leinen. "Compositional, structural and electrical characterization of barium titanate thin films prepared on fused silica and Si(111) by spray pyrolysis." Surface and Interface Analysis 30, no. 1 (2000): 565–69. http://dx.doi.org/10.1002/1096-9918(200008)30:1<565::aid-sia867>3.0.co;2-p.

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Faisal, Nadimul Haque, John A. Steel, Rehan Ahmed, R. L. Reuben, G. Heaton, and Bryan Allcock. "Application of Acoustic Emission for Monitoring the HVOF Thermal Spraying Process." Advanced Materials Research 13-14 (February 2006): 291–98. http://dx.doi.org/10.4028/www.scientific.net/amr.13-14.291.

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This research aims to characterise and quantify the acoustic emission (AE) generated during the high velocity oxy-fuel (HVOF) thermal spraying process, recorded using piezoelectric AE sensors. The HVOF process is very complex involving high temperature turbulent flow through a nozzle with entrained particles, the projection of these particles, and their interaction with the target surface. Process parameters such as gun speed, oxy-fuel pressure and powder specification affect various characteristics of the coating, including thermal residual stresses; the lamellar microstructure and the topology and geometry of pores, all formed when the fused powder hits the surface, forming “splats”. It is widely acknowledged in the thermal spray industry that existing quality control techniques and testing techniques need to be improved. New techniques which help to understand the effects of coating process parameters on the characteristics of the coating are therefore of value, and it was anticipated that recording the AE produced when the fused particles contact the surface would aid this understanding. As a first stage, we demonstrated here that AE associated with particle impact can, in fact, be discerned in the face of the considerable airborne and structure-borne noise. In order to do this, a new test method using a masking sheet with slits of varying size was developed. Thermal spraying was carried out for a range of spray gun speeds and process parameters. The AE was measured using a broad band AE sensor positioned on the back of the sample as the spot was traversed across it. The results show that the amplitude and energy of the AE signals is related to the spray gun speed, powder used and the oxy-fuel pressure. Using a simple geometrical model for particle impact, the measured AE was found to vary with the energy and number of particles impacting on the sample in a predictable way.
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OH, J., J. KOMOTORI, and J. SONG. "Fatigue strength and fracture mechanism of different post-fused thermal spray-coated steels with a Co-based self-fluxing alloy coating." International Journal of Fatigue 30, no. 8 (August 2008): 1441–47. http://dx.doi.org/10.1016/j.ijfatigue.2007.10.004.

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Conference papers on the topic "Spray-fused coatings"

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Guilemany, J. M., J. M. Miguel, S. Vizcaino, and S. Armada. "Structural Characterization of Plasma Sprayed and Spray-and-Fused NiCrBSi Coatings." In ITSC2002, edited by C. C. Berndt and E. Lugscheider. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 2002. http://dx.doi.org/10.31399/asm.cp.itsc2002p0890.

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Abstract This paper reports on a structural characterisation of the nickel alloy coatings, before and after the fuse process is done and the main phases in each case, showing important differences between the nickel alloy coatings. Spray and fuse process involves thermal spraying to apply a coating of special self-fluxing alloys and a post thermal treatment at temperature between the solidus and liquidus of the alloy, when important diffusion processes take place. An improvement of the hardness and tribological properties is observed with the addition of tungsten carbide-cobalt to the nickel alloy powder. The results show the excellent tribological properties of the spray and fused coatings, better than the obtained for the as-sprayed coatings. The adhesion strength of the nickel alloy coating after the thermal treatment achieve a value above 80 MPa. Paper includes a German-language abstract.
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Kim, H. J., S. Y. Hwang, and C. H. Lee. "Microstructure and Wear Performance of Spray & Fused NiCrBSiC/WC Composite Coatings." In ITSC2003, edited by Basil R. Marple and Christian Moreau. ASM International, 2003. http://dx.doi.org/10.31399/asm.cp.itsc2003p0543.

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Abstract Characterization of flame sprayed and furnace fused NiCrBSiC alloy coatings with two different carbon contents and 15~45 wt.% WC-Co addition is described in terms of microstructure, microhardness, and differential thermal analysis. Microstructural development of these coatings before and after fusing treatment is discussed to identify the precipitates in the coatings. Optimum fusing conditions (time and temperature) for wear testing sample are investigated in terms of microhardness and porosity of the coatings. Wear performance of these coatings is also investigated by two-body and three-body abrasive and dry sliding wear experiments. Optimum tungsten carbide content of the coatings is also selected to improve wear performance and thus enhance the service life of the process roll for cold rolling steel plant. Finally, microstructure and microhardness of the furnace and induction fused coatings are compared with emphasis on the interface between the coating and the steel substrate.
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Hodgkiess, T., and A. Neville. "An Analysis of Environmental Factors Affecting Corrosion Behaviour of Thermal Spray Cermet Coatings." In ITSC 1998, edited by Christian Coddet. ASM International, 1998. http://dx.doi.org/10.31399/asm.cp.itsc1998p0063.

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Abstract Primarily thermal-spray coatings have been developed to combat excessive degradation of components due to mechanical wear. However, these coatings are increasingly being required to function in aqueous environments where corrosive attack is possible. The durability of thermal spray coatings in terms of corrosion resistance is the focus of this paper. Two coating methods were studied: high-velocity oxyfuel (HVOF) and thermal spray-fused. The HVOF coating was WC-Co-Cr and the spray-fused coatings were WC-Co based and Ni-Cr-Si-B. Samples have been exposed to aqueous environments at a range of different temperatures and of varying salinity (500ppm and 35,000ppm Total Dissolved Solids) in order to simulate freshwater and seawater environments. The detailed material loss and degradation mechanisms have been investigated using electrochemical-monitoring techniques supported by precise post-test microscopical examination using light microscopy, scanning electron and atomic force microscopy and x-ray microanalysis. The study has demonstrated that there is a strong dependence on coating durability for all the coatings as a function of temperature but salinity has a lesser effect. However there are interesting differences in the extent and detailed mechanisms of such effects between the different coatings.
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Calla, E., and S. C. Modi. "Structure & Properties of HVOF Sprayed NiCrBSi Coatings." In ITSC2001, edited by Christopher C. Berndt, Khiam A. Khor, and Erich F. Lugscheider. ASM International, 2001. http://dx.doi.org/10.31399/asm.cp.itsc2001p0281.

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Abstract NiCrBSi spray and fuse types of coatings are routinely applied on various jobs where metallurgical bond of the coating to the substrate is desired. These coatings require a subsequent fusing operation at temperature of about 1050°C. In the present study NiCrBSi coatings were formed by the HVOF process and by the conventional spray and fuse route. The coatings were characterized for their microstructure, hardness and porosity. The aim of this study was to see whether HVOF spraying NiCrBSi spray and fuse powder could cause instant fusing of the coating without the need for additional fusing operation. XRD study of the coatings was also carried out to find out the difference between the spray and fused NiCrBSi coatings and the HVOF sprayed coatings. The HVOF spraying of NiCrBSi was carried under different set of parameters to determine the effect of spraying parameters on the properties of coating.
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Fagoaga, I., M. Parco, G. Barykin, C. Vaquero, and J. de Juan. "Development of Zirconia Coatings by HFPD." In ITSC2006, edited by B. R. Marple, M. M. Hyland, Y. C. Lau, R. S. Lima, and J. Voyer. ASM International, 2006. http://dx.doi.org/10.31399/asm.cp.itsc2006p0551.

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Abstract Different YSZ powders have been deposited by the high frequency pulse detonation (HFPD) thermal spray process leading to highly dense and hard coatings in comparison to standard APS zirconia layers. During this development, the gun configuration and the process parameters (gas flows, explosion frequency, spray distance and cinematic conditions) have been optimised to get the best deposition performance. In order to explore the potential of the HFPD system to process YSZ base materials, different type of commertial spray powders (agglomerated, fused & crushed, fully or partially stabilized compositions) and size distributions, have been investigated and the resulting coatings characterized. A qualitative comparison of the coating performance at elevated temperatures is presented and discussed. For this purporse, an experimental set-up was designed. Potential applications of these types of zirconia coatings in advanced thermal barrier coating systems, high temperature wear protection or ionic conductors (sensors and fuel cells) are discussed.
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Trache, R., L. M. Berger, F. L. Toma, S. Stahr, R. S. Lima, and B. R. Marple. "Electrical Resistivity of Thermally Sprayed Cr2O3-TiO2 Coatings." In ITSC2011, edited by B. R. Marple, A. Agarwal, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima, and A. McDonald. DVS Media GmbH, 2011. http://dx.doi.org/10.31399/asm.cp.itsc2011p1008.

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Abstract In this study, the influence of spray parameters on the electrical resistivity of thermally sprayed ceramic coatings from the system Cr2O3-TiO2 was investigated. Fused and crushed feedstock powders with contents of 10 wt. % and 20 wt. % chromium oxide were deposited by APS and HVOF. Temperature and velocity of the particles in the spray jet as well as the coating surface temperature were analyzed during the deposition process. Impedance spectroscopy was used to investigate the electrical resistivity of the coatings and the results were correlated to coating microstructure and phase composition. It was found that phase transformations occur during the spray process. In the coatings a high temperature phase (n-phase) and rutile were observed. Though, the ratio of rutile depends on the spray methods employed for coating deposition. The electrical resistivity of coatings obtained by HVOF can be correlated to the content of chromium oxide. Furthermore, the surface temperature of the coating during deposition also shows some influence. Concerning the coatings resulting from APS, the different mixtures of the plasma gases (Ar-H2 and Ar-N2) are supposed to have the most important influence on the electric resistivity.
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Moskowitz, L. "The Effects of Post Heating an HVOF Sprayed Fusible Coating." In ITSC 1997, edited by C. C. Berndt. ASM International, 1997. http://dx.doi.org/10.31399/asm.cp.itsc1997p0519.

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Abstract Fusible coatings of Nickel-Chromium alloys with various amounts of Boron and Silicon commonly used for severe load applications. The coating is normally sprayed, then fused by heating to the point of liquation. The fusing process causes powder coalescence and increases density. At the same time, the high fusing temperatures creates a “brazed” bond which gives these coatings extremely high adhesive bond strengths. The improved bond strength is the result of the metallurgical bond as compared to the majority of thermal spray coatings which rely only on mechanical bonding mechanisms. The fusing operation is very sensitive, especially when a hand torch fuse is required. To circumvent these problems, a study was conducted to see if high density HVOF sprayed coatings might achieve fused quality by furnace heating to temperatures well below the liquation point. Various times and temperatures were surveyed. Bond strength tests of coatings sprayed to heavy thicknesses, hardness and impact tests, and metallography were used for evaluation. It was determined that heating as low as 1500° F for three hours could improve the properties of an as-sprayed HVOF coating to where it developed characteristics very similar to that of a fused coating.
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Turunen, E., U. Kanerva, T. Varis, J. Knuuttila, J. Leivo, and J. Silvonen. "Nanostructured Ceramic HVOF Coatings for Improved Protection." In ITSC2007, edited by B. R. Marple, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima, and G. Montavon. ASM International, 2007. http://dx.doi.org/10.31399/asm.cp.itsc2007p0484.

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Abstract The potential of the high velocity oxy-fuel (HVOF) thermal spray process to produce coatings with reduced porosity is well known. The ability to produce high density ceramic coatings offers potential in high performance applications in the fields of wear, corrosion resistance and dielectric coatings. It has been, however, demonstrated that benefits from HVOF ceramic coatings can be obtained only if particles are melted enough and good lamella adhesion is produced. Therefore, due to the operational limits of the HVOF process, the process-structure- relationship must be well optimized. One strategy to improve melting of ceramic particles in the relatively low flame temperatures of the HVOF process is to modify particle crystal structure and composition. In this paper, the effects of the powder structure and the composition on coating microstructure and deposition efficiency of the HVOF spray process are studied. The effect of fuel gas, hydrogen vs. propane, was also demonstrated. The studied materials were agglomerated alumina- and titania-based pure and composite powders. Coating properties such as microstructure, hardness, and abrasive wear resistance, were compared to the coating manufactured by using conventional fused and crushed powders.
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Kosikowski, D., M. Batalov, and P. S. Mohanty. "Functionally Graded Coatings by HVOF-Arc Hybrid Spray Gun." In ITSC2005, edited by E. Lugscheider. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 2005. http://dx.doi.org/10.31399/asm.cp.itsc2005p0444.

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Abstract Functionally graded coatings with continuous changes of microstructures and properties across the material are expected to have low residual and thermal stresses and improved bonding strength between base materials and the ceramic coatings. This paper presents a technique to produce high-performance graded coatings in which the mix of components in the coating changes continuously from the base materials out. A hybrid HVOF-Arc spray gun has been employed to create such coatings. The metallic matrix material is utilized in the form of wires that are fused by arcing process. A high velocity combustion jet carrying the ceramic particles atomizes the molten material and mixes the ceramic particles with the matrix material. The feed rate of the matrix material and the reinforcing material are controlled together giving a systematic variation of the reinforcement phase. Two material systems; WC-16%Cr3C2-Ni-5%Al and B4C-Al(5%Si) have been investigated. The in-flight particle characteristics of the process have been characterized. The resulting microstructures and process capabilities are discussed.
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Berger, L. M., S. Thiele, M. Nebelung, O. Storz, and H. Gasthuber. "Spray Powders and Coatings on the Basis of Titanium Suboxides." In ITSC2001, edited by Christopher C. Berndt, Khiam A. Khor, and Erich F. Lugscheider. ASM International, 2001. http://dx.doi.org/10.31399/asm.cp.itsc2001p0291.

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Abstract Titanium suboxides form a class of ceramic materials possessing such technically interesting properties as electrical conductivity and solid lubrication. Consequently, these materials have a high potential for application as thermally sprayed coatings. In this paper the preparation and characterisation of two spray powders of different composition by agglomeration and sintering with a narrow range of the value n in TinO2n-1 is described. Powders were characterised by X-ray diffraction (XRD), scanning and transmission electron microscopy (SEM and TEM), thermogravimetric measurements (TG), helium pycnometry, nitrogen adsorption and mercury intrusion techniques. The sprayability was tested by plasma spraying. The coating structures were studied by optical microscopy, XRD, TG and TEM. Although the powders were only partially oxidized as a result of the spray process, the crystallographic structure was changed significantly, according to XRD and TEM investigations. As an alternative method of preparation of titanium suboxide spray powders, the reduction of a fused and crushed spray powder with hydrogen is described. Powder particle shape and size distribution are not changed in this process.
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