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Статті в журналах з теми "Glass extrusion"

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Автор: Grafiati

Опубліковано: 14 березня 2023

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1

Kalnins, Christopher A. G., Kyle J. Bachus, Andrew Gooley, and Heike Ebendorff-Heidepriem. "High precision extrusion of glass tubes." International Journal of Applied Glass Science 10, no. 2 (December 3, 2018): 172–80. http://dx.doi.org/10.1111/ijag.13092.

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2

Chiu, Ho Ming, Golden Kumar, Jerzy Blawzdziewicz, and Jan Schroers. "Thermoplastic extrusion of bulk metallic glass." Scripta Materialia 61, no. 1 (July 2009): 28–31. http://dx.doi.org/10.1016/j.scriptamat.2009.02.052.

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3

Chang, Da Wei, Xiao Ming Zhang, and Jin Moon Kim. "Encapsulation of Vitamin E in Glassy Carbohydrates by Extrusion." Advanced Materials Research 842 (November 2013): 95–99. http://dx.doi.org/10.4028/www.scientific.net/amr.842.95.

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Vitamin E (VE) was encapsulated in glassy carbohydrates by extrusion. Four typical formulations were prepared in order to have 5% and 8% VE added to each 20% and 30% modified starch containing feed material, all four formulations contained soya lecithin at 1% level as an emulsifier. The physico-chemical properties of glassy extruded products were investigated. The results showed that the VE retention rates were above 93%, meanwhile the VE oil was dispersed uniformly throughout the carbohydrate mass after extrusion. There was a slight loss for VE during the storage. The glass transition temperature (Tg) of the extrudates were above 30°C and Tg could be a good predictor of caking properties at elevated temperatures.

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4

Tang, Danna, Yushen Wang, Zheng Li, Yan Li, and Liang Hao. "Coupling additive manufacturing and low-temperature sintering: a fast processing route of silicate glassy matrix." Rapid Prototyping Journal 28, no. 4 (October 18, 2021): 676–85. http://dx.doi.org/10.1108/rpj-07-2020-0173.

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Purpose The low-temperature sintering of silica glass combined with additive manufacturing (AM) technology has brought a revolutionary change in glass manufacturing. This study aims to carry out in an attempt to achieve precious manufacturing of silicate glassy matrix through the method of slurry extrusion. Design/methodology/approach A low-cost slurry extrusion modelling technology is used to extrude silicate glassy matrix inks, composed of silicate glass powder with different amounts of additives. Extrudability of the inks, their printability window and the featuring curves of silicate glassy matrix are investigated. In addition, the properties of the low-temperature sintering green part as a functional part are explored and evaluated from morphology, hardness and colour. Findings The results showed that the particle size was mainly distributed from 1.4 µm to 5.3 µm, showing better slurry stability and print continuity. The parameters were set to 8 mm/s, 80% and 0.4 mm, respectively, to achieve better forming of three-dimensional (3D) samples. Besides, the organic binder removal step was concentrated on 200°C–300°C and 590°C–650°C was the fusion bonding temperature of the powder. The hardness values of 10 test samples ranged from 588 HL to 613 HL, which met the requirements of hard stones with super-strong mechanical strength. In addition, the mutual penetration of elements caused by temperature changes may lead to a colourful appearance. Originality/value The custom continuous AM technology enables the fabrication of a glass matrix with 3D structural features. The precise positioning technology of the glass matrix is expected to be applied more widely in functional parts.

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5

Sordelet, D. J., E. Rozhkova, P. Huang, P. B. Wheelock, M. F. Besser, M. J. Kramer, M. Calvo-Dahlborg, and U. Dahlborg. "Synthesis of Cu47Ti34Zr11Ni8Bulk Metallic Glass by Warm Extrusion of Gas Atomized Powders." Journal of Materials Research 17, no. 1 (January 2002): 186–98. http://dx.doi.org/10.1557/jmr.2002.0028.

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Cu47Ti34Zr11Ni8amorphous gas atomized powders were consolidated by warm extrusion. After consolidation near 723 K using an extrusion ratio of 5, the material retains between 88% and 98% of the amorphous structure found in the gas atomized powder. The onsets of the glass transition and crystallization temperatures of this extruded material are observed respectively at slightly higher and lower temperatures than those of the starting powders. These temperature shifts are attributed to a composition change in the remaining amorphous phase during partial devitrification throughout the extrusion process. Powders extruded at the same temperature, but using higher extrusion ratios of 9 and 13, exhibit substantial devitrification during the consolidation process yet still deform homogeneously.

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6

Wu, X., J. J. Li, Z. Z. Zheng, L. Liu, and Y. Li. "Micro-back-extrusion of a bulk metallic glass." Scripta Materialia 63, no. 5 (September 2010): 469–72. http://dx.doi.org/10.1016/j.scriptamat.2010.05.004.

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7

Zhihui, Ma, Dong Xianghuai, Su Hongjuan, and Wang Ruyan. "Isothermal Extrusion Properties of Zr55Cu30Al10Ni5 Bulk Metallic Glass." Rare Metal Materials and Engineering 41, no. 10 (October 2012): 1706–8. http://dx.doi.org/10.1016/s1875-5372(13)60009-0.

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8

Zhang, L. C., M. Calin, M. Branzei, L. Schultz, and J. Eckert. "Phase stability and consolidation of glassy/nanostructured Al85Ni9Nd4Co2 alloys." Journal of Materials Research 22, no. 5 (May 2007): 1145–55. http://dx.doi.org/10.1557/jmr.2007.0156.

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Al85Ni9Nd4Co2 metallic glass/nanostructured ribbons and powders were used as starting materials for producing bulk amorphous/nanostructured Al-based alloys. Glassy ribbons were obtained by melt spinning at wheel surface velocities ranging from 5 to 37 m/s. The amorphous ribbons exhibited a supercooled liquid region of ∼20 K, a reduced glass transition temperature of ∼0.47 and γ ∼ 0.328. Mechanical alloying of the elemental powder mixture did not lead to amorphization. However, amorphous powders obtained by milling the glassy ribbons for 9 h exhibited a thermal stability similar to the initial ribbons. Isothermal differential scanning calorimetry measurements were used to determine the consolidation parameters of the glassy powders. Consolidation at 513 K by uniaxial hot pressing and hot extrusion indicated that the former method leads to bulk glassy samples, whereas the latter one yields nanostructured α-Al/glassy matrix composites.

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9

Liu, Chang Yong, Lei Zhang, and Fei Yu Kang. "Experimental Study on Heat Transfer Boundary Conditions for Steel Hot Extrusion Process." Advanced Materials Research 668 (March 2013): 856–60. http://dx.doi.org/10.4028/www.scientific.net/amr.668.856.

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Heat transfer boundary conditions have significant influence on the FEM analysis of the steel hot extrusion process using glass lubricant. However, the determination of heat transfer coefficient between billet and tooling lacked experimental basis. In order to obtain rational values of the coefficient, experimental study was conducted to measure it on thermal contact between P92 steel and H13 steel separated by glass lubricant. The influence of contact temperature, contact pressure and lubricant thickness was investigated. The obtained results can provide experimental basis for the determination of heat transfer boundary conditions for steel hot extrusion.

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10

Kalthoff, Matthias, Michael Raupach, and Thomas Matschei. "Investigation into the Integration of Impregnated Glass and Carbon Textiles in a Laboratory Mortar Extruder (LabMorTex)." Materials 14, no. 23 (December 2, 2021): 7406. http://dx.doi.org/10.3390/ma14237406.

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A promising process for the automatization of concrete structures is extrusion or extrusion molding. An innovative approach is the extrusion of concrete with imbedded technical textiles as reinforcement. For a successful extrusion, the rheological properties of the fresh concrete have to be optimized, as it must be extrudable and have sufficient early strength after leaving the mouthpiece. Within the scope of this paper, a process was developed which allows the integration of flexible as well as stiff impregnated textiles into the extrusion process. For this purpose, different textile-reinforced mortars (TRM) were extruded and their material characteristics were investigated. The results show that the mortar cross-section is considerably strengthened, especially when using carbon textiles, and that extrusion has considerable potential to produce high-performance TRM composites. In uniaxial tension tests with TRM, as well as in the pure roving tensile strength tests, textile stresses of approx. 1200 MPa were achieved for the glass textile and approx. 2250 MPa for the carbon textile. The position of the textile layer deviated a maximal 0.4 mm from its predesigned position, which shows its potential for producing tailor-made TRM elements. In addition, by adjusting the mortar mix design, it was possible to reduce the global warming potential (GWP) of the extrusion compound by up to 49.3% compared to the initial composition from preliminary studies.

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11

Rjabicheva, L. A., and D. A. Usatjuk. "Modeling the evolution of the deformation zone under various extrusion schemes." Izvestiya MGTU MAMI 7, no. 2-2 (March 20, 2013): 120–24. http://dx.doi.org/10.17816/2074-0530-68103.

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Using the simulation results it was shown an optimal correlation of the size and porosity of powder compacts and also the amount of counterpressure recommended for the production of equal channel angular extrusion of workpieces with high-density of deformation zone that is large enough for subsequent direct extrusion powder of parts with high mechanical properties.The article defines the maximum depth of the cavity in direct extrusion through the research of plasticity resource. This paper describes the developed technology of manufacturing high-density parts of the "glass" type with the consistent application of the equalchannel angular and direct extrusion.

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12

Nikiforov, A. A., S. I. Vol'fson, N. A. Okhotina, R. Rinberg, and L. Kroll. "The Influence of Processing Additives on the Properties of Glass-fibre-reinforced Composites Based on Biobased Polyamide 1010." International Polymer Science and Technology 44, no. 7 (July 2017): 43–48. http://dx.doi.org/10.1177/0307174x1704400709.

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Анотація:

The results of investigating the influence of processing additives from a group of lubricants on the degree of comminution of glass fibres during extrusion and the properties of composites based on biobased polyamide 1010 with different degrees of filling with chopped glass fibre are presented.

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13

Swamy, Praveen Kumar, Shantharaja Mylaraiah, and Dadapeer Basheer. "Evaluation of Microstructure, Hardness, and Tensile Properties: A Comparative Study of Stir Cast and Extruded Al7005/Glass-/Fly-Ash-Reinforced Hybrid MMCs." Advances in Materials Science and Engineering 2021 (July 27, 2021): 1–7. http://dx.doi.org/10.1155/2021/8601484.

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The effect of extrusion ratio and addition of glass and fly ash on microstructural, mechanical properties, and fracture behavior of Al composites is examined. Both the composites and hybrid composites are prepared by the liquid metallurgical technique. Microstructure, extrusion effect on hardness, tensile properties, and fracture are studied using an optical micrograph, hardness tester, Universal Testing Machine, and scanning electron microscope, respectively. Experimental results show that increasing the extrusion ratio leads to a significant enhancement in mechanical properties such as tensile, compression, and yield strength and Young’s modulus, but results in a small reduction of ductility. It has been revealed that the presence of glass and fly ash improve the mechanical properties significantly with a slight reduction in ductility compared to the Al alloy. Fracture behaviour of the base alloy and composites show intergranular ductile and brittle cleavage mode failure as observed by SEM.

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14

Medvedev, M., Ye Shyfrin, Ya Frolov, and O. Bobukh. "Estimation of glass lubricant viscosity for hot extrusion of Cr-Ni steel and Ni alloy tubes." Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, no. 1 (February 28, 2022): 33–37. http://dx.doi.org/10.33271/nvngu/2022-1/033.

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Purpose. Estimation of optimal viscosity of a glass lubricant for chromium-nickel steel tube extrusion depending on the deformation resistance, chemical composition of metal and the temperature, degree and rate of deformation. Methodology. To determine the force conditions for tube extrusion, a complex factor of deformation resistance was used, which consists in estimating the value of deformation resistance under the basic process parameters of extrusion plants and its refinement depending on the deviations of heating temperature and wall thickness of billets as well as the degree and rate of deformation from the base conditions. Findings. The dependence of basic values of deformation resistance on the percentage of alloying elements (Ni + Cr) in steels has been found. With the addition of hardening alloying elements (Mo, W, V, Nb) into the alloy steel, its deformation resistance increases in proportion to their percentage. Analytical expressions for calculating the base values of deformation resistance for different extrusion plants have been obtained. Originality. For the first time, the principles governing estimation of the optimal viscosity of glass lubricants based on the chemical composition of steel to be formed, its temperature and the degree and rate of deformation of the blank, thickness of the lubricating layer and geometric dimensions of the tool (die) in hot extrusion of tubes have been established. Practical value. The use of the results of calculation according to the developed method will make it possible to increase the surface quality of tubes manufactured by extrusion and reduce the volume of their subsequent machining.

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15

Yang, Jing, Qing Jun Zhou, Chao Yang Sun, and Dong Liu. "Investigation of the Mandrel’s Stress States and Wear Conditions during Tube Hot Extrusion of IN690 Superalloy." Key Engineering Materials 622-623 (September 2014): 111–18. http://dx.doi.org/10.4028/www.scientific.net/kem.622-623.111.

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A 2D axi-symmetric finite element model for tube hot extrusion process has been established by consideration of the billet transfer, glass lubrication, constitutive equation of IN690 superalloy and modified Archard wear model. The influence of extrusion process parameters on the stress state and wear conditions of the mandrel surface has been investigated. The results show that under the optimal extrusion process parameters of the extrusion speed of 250 mm/s, the friction factor of 0.05 and the billet preheating temperature of 1250 ̊C, the mandrel can be reused 200 times when it is fixed and 500 times when it moves with the ram.

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16

LIU, Changyong. "Lubrication Behavior of the Glass Lubricated Hot Extrusion Process." Journal of Mechanical Engineering 47, no. 20 (2011): 127. http://dx.doi.org/10.3901/jme.2011.20.127.

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17

Yu, G. S., J. G. Lin, W. Li, and C. E. Wen. "Extrusion properties of a Zr-based bulk metallic glass." Materials Letters 63, no. 15 (June 2009): 1317–19. http://dx.doi.org/10.1016/j.matlet.2009.02.058.

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18

Hotza, Dachamir, and Antonio Pedro Novaes de Oliveira. "New Silicate Glass-Ceramic Materials and Composites." Advances in Science and Technology 68 (October 2010): 1–12. http://dx.doi.org/10.4028/www.scientific.net/ast.68.1.

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New silicate glass-ceramic compositions have been investigated due to their interesting chemical, mechanical, thermal, and electrical properties. LZSA glass-ceramics based on -spodumene (Li2O•Al2O3•4-10SiO2) and zircon (ZrSiO4) crystalline phases have shown good chemical resistance, high bending strength as well as high abrasion resistance, when compared with traditional ceramic materials, and coefficient of thermal expansion from 4.6 to 9.110-6 °C-1. These features basically depend on the nature, size and distribution of the formed crystals as well as on the residual glassy phase. The nature of the formed crystalline phases and consequently the final properties can be controlled by modifying the chemical composition of the parent glass and also by adequate selection of the heat-treatment parameters. The classical fabrication of glass-ceramic materials consists on the preparation of monolithic glass components followed by heat treatments for crystallisation. However, this technology requires high investments and can be justified only for large production. A viable alternative could be the production of glass-ceramics processed from glass powders and consolidated by sintering using the same equipments of traditional ceramic plants. This work reports the manufacturing and characterization of glass-ceramic materials and composites processed by pressing, injection moulding, extrusion, casting, replication, and rapid prototyping.

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19

Kim, Jung Sub, Chang Su Lee, Sang Won Lee, Sung-Min Kim, Jae Hyuk Choi, Haseung Chung, and Pil-Ho Lee. "Fabrication and characterization of hollow glass beads-filled thermoplastic composite filament developed for material extrusion additive manufacturing." Journal of Composite Materials 54, no. 5 (July 23, 2019): 607–15. http://dx.doi.org/10.1177/0021998319863836.

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This paper explores the characteristics of a new lightweight thermoplastic composite filament filled with hollow glass beads developed for material extrusion additive manufacturing. Compounding experiments, which mix hollow glass beads with neat acrylonitrile butadiene styrene matrix, were conducted using a twin-screw extruder to prepare composite filaments. Two different types of hollow glass beads were selected as the fillers of composite filament due to their varying densities. In order to characterize the final components produced using composite filament, various specimens were fabricated by a material extrusion additive manufacturing process. In order to characterize the physical properties of the specimens, measurements of density and flexural testing were performed. To identify the thermomechanical effects of hollow glass beads on the neat acrylonitrile butadiene styrene matrix, thermal diffusivity and specific heat were obtained. Consequently, the thermal conductivity of the specimen was derived from its density, thermal diffusivity, and specific heat capacity. The microstructures of the fractured interfaces of the specimens were also observed by scanning electron microscopy. The experimental results revealed that most of the hollow glass beads survived, thus bringing about lighter weight (lower density) and thermal insulation (lower thermal conductivity), which can be useful for numerous potential applications.

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20

Gocek, Ikilem, Reyhan Keskin, and Guralp Ozkoc. "Effect of Fiber Content on Failure Modes of Glass Fiber Reinforced Injection Molded Polyamide 66 Composites." Advanced Materials Research 1119 (July 2015): 296–300. http://dx.doi.org/10.4028/www.scientific.net/amr.1119.296.

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In the present study, glass fiber reinforced Polyamide 66 composites were produced using laboratory type twin screw extrusion and injection molding processes. The glass fiber reinforcement was applied at 1, 10, 15, 20, 25 and 30 wt% loadings. The morphological structure of the samples and failure modes of glass fiber reinforced Polyamide 66 composites were investigated using scanning electron microscopy (SEM) analysis on fractured surfaces of tensile tested samples in this study.

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21

Brüster, Berit, Yann-Olivier Adjoua, Reiner Dieden, Patrick Grysan, Carlos Eloy Federico, Vincent Berthé, and Frédéric Addiego. "Plasticization of Polylactide with Myrcene and Limonene as Bio-Based Plasticizers: Conventional vs. Reactive Extrusion." Polymers 11, no. 8 (August 18, 2019): 1363. http://dx.doi.org/10.3390/polym11081363.

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Polylactide (PLA) was blended by conventional and reactive extrusion with limonene (LM) or myrcene (My) as bio-based plasticizers. As-processed blends were carefully analyzed by a multiscale and multidisciplinary approach to tentatively determine their chemical structure, microstructure, thermal properties, tensile and impact behaviors, and hydrothermal stability. The main results indicated that LM and My were efficient plasticizers for PLA, since compared to neat PLA, the glass transition temperature was reduced, the ultimate tensile strain was increased, and the impact strength was increased, independently of the type of extrusion. The addition of a free radical initiator during the extrusion of PLA/LM was beneficial for the mechanical properties. Indeed, the probable formation of local branched/crosslinked regions in the PLA matrix enhanced the matrix crystallinity, the tensile yield stress, and the tensile ultimate stress compared to the non-reactive blend PLA/LM, while the other properties were retained. For PLA/My blends, reactive extrusion was detrimental for the mechanical properties since My polymerization was accelerated resulting in a drop of the tensile ultimate strain and impact strength, and an increase of the glass transition temperature. Indeed, large inclusions of polymerized My were formed, decreasing the available content of My for the plasticization and enhancing cavitation from inclusion-matrix debonding.

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22

Zasadzińska, Małgorzata, Paweł Strzępek, Andrzej Mamala, and Piotr Noga. "Reinforcement of Aluminium-Matrix Composites with Glass Fibre by Metallurgical Synthesis." Materials 13, no. 23 (November 29, 2020): 5441. http://dx.doi.org/10.3390/ma13235441.

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Continuous pressure put on researchers all over the world these days to design materials of improved properties create opportunities to study new methods of production in conjunction with entirely new and innovative materials such as alloys or composites. The authors in the current research manufactured aluminium reinforced with glass fibre (GF) using metallurgical synthesis, which is an unconventional and not sufficiently studied method of production. The composites with 1, 2 and 5 wt.% of glass fibre were produced with additional material obtained using consolidation of aluminium powder in extrusion process as reference material with 5 wt.% of glass fibre. All the materials were subjected to series of tests in order to determine their microstructure, density, electrical properties, hardness and susceptibility to plastic working in the compression test. It was found that glass fibre during metallurgical synthesis of aluminium composite partially melted and thus did not reinforce the material as well as during extrusion, which has been observed not only in the scanning electron microscope (SEM) and energy-dispersive X-ray (EDX) analysis but also in the analysis of macroscopic physical and mechanical properties. Based on the analysed samples, it may be stated that electrical conductivity of the samples obtained via metallurgical synthesis is higher than might be estimated on the basis of the rule of mixtures and glass fibre content and concerning the sample with 5 wt.% of GF is higher (32.1 MS/m) than of the reference material obtained in extrusion process (30.6 MS/m). Similar situation has been observed in terms of hardness of the tested samples where a minor increase in hardness was noticeable as the amount of glass fibre increased in the composites obtained by metallurgical synthesis. It is believed to be related to the melting of glass fibre, which reduced the volume fraction of GF containing mainly silicon oxides and their diffusion into the aluminium matrix, thus causing solid solution strengthening.

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23

Petrauskas, Anderson, Bruna Luiza do Nascimento, Isabelle Adad Fornazari, Evelise Machado de Souza, and Rodrigo Nunes Rached. "Use of fiberglass CAD-CAM post-and-core for rapid orthodontic extrusion of anterior tooth – Case Report." Research, Society and Development 10, no. 16 (December 13, 2021): e337101623686. http://dx.doi.org/10.33448/rsd-v10i16.23686.

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This report describes the restoration of an anterior fractured tooth with a fiberglass CAD-CAM post-and-core followed by rapid orthodontic extrusion. The post space was prepared, the post-and-core was luted and a interim crown was luted to allow the tooth extrusion through the use of orthodontic buttons and elastic rubber bands. A lithium disilicate glass-ceramic crown was luted and the case was followed up after 6 and 12 months.

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24

Popescu, Adrian, Liana Livia Hancu, Paul Bere, and Cristina Ștefana Miron-Borzan. "Experimental and Theoretic Research Regarding Extrusion Optimization for Reinforced Polyamide (PA 6.6 – 10 % GF)." Applied Mechanics and Materials 808 (November 2015): 125–30. http://dx.doi.org/10.4028/www.scientific.net/amm.808.125.

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Анотація:

This paper presents the possibility of extrusion optimization using Design Expert software for statistical analyze and also for the recommendation of some manufacturing data. Mechanical characteristics are determined on samples from extruded tubes. On these samples, ANOVA (Analysis of variance) software is used, in order to determine the optimal values of the temperatures in different zones. The material is polyamide 6.6, reinforced with 10 % glass fiber (PA 6.6 – 10 % GF). The authors want to present the influence of the reinforcement degree upon some mechanical characteristics of the products made by extrusion. Considering the homogeneity of the polymeric melt the product’s quality will be analyzed. During the extrusion process a series of parameters (extrusion speed, the pellets feed, processing temperature etc.) are involved and they must be taken into account to achieve calibrated and qualitative products.

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25

Ren, Yu, John Gavenonis, Rina Ai, Ray Huang, Christophe Chervin, Yanshou Tang, Jane Zhang, et al. "Glass fiber–reinforced, bio-based poly(trimethylene terephthalate) for extrusion." Green Materials 1, no. 4 (December 2013): 218–24. http://dx.doi.org/10.1680/gmat.13.00002.

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26

Mader, Markus, Leonhard Hambitzer, Phillip Schlautmann, Sophie Jenne, Christian Greiner, Florian Hirth, Dorothea Helmer, Frederik Kotz‐Helmer, and Bastian E. Rapp. "Melt‐Extrusion‐Based Additive Manufacturing of Transparent Fused Silica Glass." Advanced Science 8, no. 23 (October 20, 2021): 2103180. http://dx.doi.org/10.1002/advs.202103180.

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27

Ebendorff-Heidepriem, Heike, and Tanya M. Monro. "Analysis of glass flow during extrusion of optical fiber preforms." Optical Materials Express 2, no. 3 (February 22, 2012): 304. http://dx.doi.org/10.1364/ome.2.000304.

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28

Ausias, G., M. Vincent, and J. Jarrin. "Optimization of the Extrusion Process for Glass-Fiber-Reinforced Tubes." Journal of Thermoplastic Composite Materials 8, no. 4 (October 1995): 435–48. http://dx.doi.org/10.1177/089270579500800406.

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29

Jiang, Chen, Xunsi Wang, Minming Zhu, Huijuan Xu, Qiuhua Nie, Shixun Dai, Guangming Tao, et al. "Preparation of chalcogenide glass fiber using an improved extrusion method." Optical Engineering 55, no. 5 (May 27, 2016): 056114. http://dx.doi.org/10.1117/1.oe.55.5.056114.

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30

Bhowmick, Kaustav, David Furniss, Herve P. Morvan, Angela B. Seddon, and Trevor M. Benson. "Predictive, Miniature Co-Extrusion of Multilayered Glass Fiber-Optic Preforms." Journal of the American Ceramic Society 99, no. 1 (October 3, 2015): 106–14. http://dx.doi.org/10.1111/jace.13937.

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31

Gravier, S., S. Puech, J. J. Blandin, and M. Suéry. "New Metallic Glass/Alloy (MeGA) Rods Produced by Co-extrusion." Advanced Engineering Materials 8, no. 10 (October 2006): 948–53. http://dx.doi.org/10.1002/adem.200600139.

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32

Du, Fanfan, Rafael Erdmann, Albrecht Petzold, Andre Wutzler, Andreas Leuteritz, Michael Nase, and René Androsch. "Structure, Properties, and Release Kinetics of the Polymer/Insect Repellent System Poly (l-Lactic Acid)/Ethyl Butylacetylaminopropionate (PLLA/IR3535)." Pharmaceutics 14, no. 11 (November 4, 2022): 2381. http://dx.doi.org/10.3390/pharmaceutics14112381.

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Анотація:

The insect repellent ethyl butylacetylaminopropionate (IR3535) was used as a functional additive for poly (l-lactic acid) (PLLA) to modify its structure and mechanical properties and achieve insect repellency. PLLA/IR3535 mixtures at various compositions were prepared via melt extrusion. In the analyzed composition range of 0 to 23 m% IR3535, PLLA and IR3535 were miscible at the length scale represented by the glass transition temperature. Addition of IR3535 resulted in a significant decrease in the glass transition temperature of PLLA, as well as in the elastic modulus, indicating its efficiency as a plasticizer. All mixtures were amorphous after extrusion, though PLLA/IR3535 extrudates with an IR3535 content between 18 and 23 m% crystallized during long-term storage at ambient temperature, due to their low glass transition temperature. Quantification of the release of IR3535 into the environment by thermogravimetric analysis at different temperatures between 50 and 100 °C allowed the estimation of the evaporation rate at lower temperatures, suggesting an extremely low release rate with a time constant of the order of magnitude of 1–2 years at body temperature.

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33

Vorontsov, A. L., and D. A. Lebedeva. "COMBINED EXTRUSION OF GLASSES WITH A CONICAL BOTTOM. METHODOLOGY FOR CALCULATING TECHNOLOGICAL PARAMETERS OF THE TRADITIONAL PROCESS OF CONSTRAINED EXTRUSION." Spravochnik. Inzhenernyi zhurnal, no. 296 (November 2021): 2–8. http://dx.doi.org/10.14489/hb.supp.2021.11.pp.002-008.

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Анотація:

The methodology for calculating the energy-power and deformation parameters of the traditional process of constrained extrusion of glasses with a conical bottom part, including preliminary obtaining by molding the outer conical section of the bottom part of the product and the subsequent reverse extrusion of the glass with an internal cavity of the required geometry, is presented. The extrusion of both non-hardening and hardening material is considered. In the latter case, the account of the hardening of the extruded material is described in detail. The above formulas allow us to determine such important parameters of the stamping process as total and specific deforming force, maximum pressure on the die wall, and an increase in the yield stress.

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34

Vorontsov, A. L., and D. A. Lebedeva. "COMBINED EXTRUSION OF GLASSES WITH A CONICAL BOTTOM. METHODOLOGY FOR CALCULATING TECHNOLOGICAL PARAMETERS OF THE TRADITIONAL FREE EXTRUSION PROCESS." Spravochnik. Inzhenernyi zhurnal, no. 295 (October 2021): 19–24. http://dx.doi.org/10.14489/hb.supp.2021.10.pp.019-024.

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Анотація:

The method of calculating the energy-power and deformation parameters of the traditional process of free extrusion of glasses with a conical bottom part, including preliminary formation of the outer conical section of the bottom part of the product by molding and the following reverse extrusion of the glass with an internal cavity of the required geometry. The extrusion of both non-hardening and hardening material is considered. In the latter case, the account of the hardening of the extruded material is described in detail. The above formulas allow us to determine such important parameters of the stamping process as total and specific deforming force, maximum pressure on the die wall, and an increase in the yield stress.

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35

Rüppel, Annette, Susanne Wolff, Jan Philipp Oldemeier, Volker Schöppner, and Hans-Peter Heim. "Influence of Processing Glass-Fiber Filled Plastics on Different Twin-Screw Extruders and Varying Screw Designs on Fiber Length and Particle Distribution." Polymers 14, no. 15 (July 30, 2022): 3113. http://dx.doi.org/10.3390/polym14153113.

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Due to their valuable properties (low weight, and good thermal and mechanical properties), glass fiber reinforced thermoplastics are becoming increasingly important. Fiber-reinforced thermoplastics are mainly manufactured by injection molding and extrusion, whereby the extrusion compounding process is primarily used to produce fiber-filled granulates. Reproducible production of high-quality components requires a granulate in which the fiber length is even and high. However, the extrusion process leads to the fact that fiber breakages can occur during processing. To enable a significant quality enhancement, experimentally validated modeling is required. In this study, short glass fiber reinforced thermoplastics (polypropylene) were produced on two different twin-screw extruders. Therefore, the machine-specific process behavior is of major interest regarding its influence. First, the fiber length change after processing was determined by experimental investigations and then simulated with the SIGMA simulation software. By comparing the simulation and experimental tests, important insights could be gained and the effects on fiber lengths could be determined in advance. The resulting fiber lengths and distributions were different, not only for different screw configurations (SC), but also for the same screw configurations on different twin-screw extruders. This may have been due to manufacturer-specific tolerances.

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36

Bae, Dal Hee, Myung Hyun Lee, and D. H. Kim. "Deformation Behavior of Ni-Based Metallic Glass Matrix Composites Reinforced by Brass Short-Fibers Synthesized by Warm Extrusion of Powders." Materials Science Forum 449-452 (March 2004): 937–40. http://dx.doi.org/10.4028/www.scientific.net/msf.449-452.937.

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Анотація:

Deformation behavior of Ni-based metallic glass matrix composites reinforced by short brass-fibers, synthesized by warm extrusion of gas atomized powders, has been investigated under the uniaxial compression condition at room temperature. The brass-fibers are well distributed in the metallic glass matrix and enhanced macroscopic plasticity is observed due to the formation of multiple shear bands, initiated from the interface between brass-fiber and metallic glass matrix, as well as their confinement between the brass-fibers, stemming from the constrained plastic deformation of the reinforcing brass phase.

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37

Lee, Min Ha, and Bum Sung Kim. "Mechanical Properties of Metallic Glass Matrix Composites Synthesized by Powder Consolidation as Precursor of Porous Material." Applied Mechanics and Materials 152-154 (January 2012): 643–46. http://dx.doi.org/10.4028/www.scientific.net/amm.152-154.643.

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Mechanical properties of Cu-based metallic glass matrix composites reinforced by ductile fugitive phases, synthesized by warm extrusion of gas atomized powders, has been investigated under the uniaxial compression condition at room temperature. The ductile fugitive phases are well distributed in the metallic glass matrix and enhanced macroscopic plasticity is observed due to the formation of multiple shear bands, initiated from the interface between ductile fugitive phase and metallic glass matrix, as well as their confinement between the reinforcements, stemming from the constrained plastic deformation of the reinforcing ductile phase.

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38

Phuong, Vu Thanh, Maria Beatrice Coltelli, Irene Anguillesi, Patrizia Cinelli, and Andrea Lazzeri. "Modification of the Mechanical Behavior in the Glass Transition Region of Poly(lactic acid) (PLA) through Catalyzed Reactive Extrusion with Poly(carbonate) (PC)." Advanced Materials Research 1119 (July 2015): 292–95. http://dx.doi.org/10.4028/www.scientific.net/amr.1119.292.

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In order to improve the thermal stability of PLA based materials it was followed the strategy of blending it with a polymer having a higher glass transition temperature such as poly (carbonate) of bisphenol A (PC) . PLA/PC blends with different compositions were by melt extrusion produced also in the presence of an interchange reaction catalyst, tetrabutylammonium tetraphenylborate (TBATPB) and triacetin. The dynamical mechanical thermal characterization showed an interesting change of the storage modulus behavior in the PLA glass transition region, evident exclusively in the catalyzed blends. In particular, a new peak in the Tan δ trend at a temperature in between the one of PLA and the one of PC was observed only in the blends obtained in the presence of triacetin and TBATPB. The height and maximum temperature of the peak was different after the annealing of samples at 80°C. The data showed an interesting improvement of thermal stability above the PLA glass transition, this was explained keeping into account the formation of PLA-PC copolymer during the reactive extrusion. Furthermore, the glass transition temperature of the copolymer as a function of composition was studied and the obtained trend was discussed by comparing with literature models developed for copolymers.

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39

Xiao, Wu, Jian Jun Li, Zhi Zhen Zheng, and Jin Yang Li. "The Effect of Forming Speed on the Formability of a Zr-Based Bulk Metallic Glass." Advanced Materials Research 1088 (February 2015): 265–71. http://dx.doi.org/10.4028/www.scientific.net/amr.1088.265.

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Taking cup-shaped part (outer diameter D and wall thickness are chosen as 2.2 mm and 0.05 mm, respectively) as an example, the micro-back-extrusion forming process of a Zr55Cu30 Al10Ni5 bulk metallic glass (BMG) in its supercooled liquid region was studied by using finite-element analysis (FEM) and experiment. The effect of forming speed on the formability was analyzed based on the extrusion load, the rheological behavior of the material and the microstructure of the formed parts. It was found that while the forming speed is below than 4 μm/s, the extrusion load increases obviously with the increasing in forming speed, otherwise, the BMG will follow non-newtonian flow and the forming load is insensitive to the forming speed. The parts fabricated at 2 μm/s are obviously crystallized due to the long retention time of metallic glasses at high temperature, a higher forming speed is benefit to enhancing the formability if the BMG. On this basis, micro cup-shaped parts with only 0.05 mm in wall thickness are successfully extruded.

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40

Damodaran, Dinesh, and Rajiv Shivpuri. "Effect of Glass Lubricant Behavior on the Surface Quality of Extrudates in Glass-Lubricated Hot Extrusion." CIRP Annals 46, no. 1 (1997): 179–82. http://dx.doi.org/10.1016/s0007-8506(07)60803-8.

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41

Swamy, Praveen Kumar, Shantharaja Mylaraiah, Manjunath Patel Gowdru Chandrashekarappa, Avinash Lakshmikanthan, Danil Yurievich Pimenov, Khaled Giasin, and Munishamaiah Krishna. "Corrosion Behaviour of High-Strength Al 7005 Alloy and Its Composites Reinforced with Industrial Waste-Based Fly Ash and Glass Fibre: Comparison of Stir Cast and Extrusion Conditions." Materials 14, no. 14 (July 14, 2021): 3929. http://dx.doi.org/10.3390/ma14143929.

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The stringent demand to develop lightweight materials with enhanced properties suitable for various engineering applications is the focus of this research work. Industrial wastes such as fly ash (FA) and S-glass-fibres (GF) were used as reinforcement materials for high-strength alloy, i.e., Al 7005. Stir casting routes were employed for fabricating the four samples, Al 7005, Al 7005 + 5% GF, Al 7005 + 6% FA and Al 7005 + 5% GF + 6% FA. The extrusion process with different extrusion ratios (ER: 5.32:1, and 2.66:1) was used to examine the properties of all four samples. Extruded samples with ER: 5.32: 1 resulted in equiaxed grains with refined structure compared to stir casting parts. The effect of the extrusion process and the addition of reinforcements (GF and FA) on the gravimetric, electrochemical, and electrochemical impedance corrosion behaviour of Al 7005 composites in 1M HCl (Hydrochloric acid) solution were investigated. The results of all three corrosion methods showed that Al 7005 + 6% FA exhibited higher corrosion resistance. Corrosion rate of Al 7005, Al 7005 + 5% GF, Al 7005 + 6% FA and Al 7005 + 5% GF + 6% FA is found equal to 3.25, 2.41, 0.34, and 0.76 mpy, respectively. The FA particles remain inert and act as a physical barrier with corrosive media during the corrosion test. GF undergoes fibre degradation or disrupts the continuity of the glass network as a result of fibre leaching, which increases the corrosion rate in the sample. The gravimetric study showed that the corrosion rates decreased with an increase in extrusion ratio, which might be due to corrosion passivation increases and improved properties. The scanning electron microscopy reveals that corrosion fits, flakes and micro-cracks were observed more in the as-cast composites than that of extrusion composites, promoting the corrosion rate.

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42

Sun, Chao Yang, Bin Liu, Qing Dong Zhang, and Rui Li. "Non-Uniform Deformation Characteristic of in 690 Superalloy Tube in Glass Lubricated Hot Extrusion." Advanced Materials Research 145 (October 2010): 332–39. http://dx.doi.org/10.4028/www.scientific.net/amr.145.332.

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Анотація:

A two-dimensional axi-symmetric finite element model for the tube hot extrusion process was developed based on Deform-2D software by consideration of the billet transfer, glass lubrication and the constitutive characteristics of IN 690 superalloy. An enhanced technique for adaptive mesh refinement (AR) is used to solve the large deformation problem. This model was then used to study the effect of boundary conditions and process parameters in tube hot extrusion. The Non-uniform deformation index as the representative parameter, which denotes the non-uniform deformation during the steady state of tube hot extrusion, is presented accordance to the feature of metal flow at deformation zone. The bigger of Non-uniform deformation index, the worse of non-uniform strain distribution. When the non-uniform deformation index getting smaller, the equivalent strain distribution along the length and cross section become more uniform and better product quality could be obtained. An increase in the billet and die preheating temperature could reduce the non-uniform deformation index individually. But the billet and die preheating temperature should not be too high. The increase of friction coefficient, the non-uniform deformation index also increased, which indicate appreciable results of metal flow. With the ram speed increase, the non-uniform deformation index decreases, but too fast speed is inadmissibility.

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43

Loypetch, Nalin, Jürgen Tröltzsch, Lothar Kroll, and Suchart Siengchin. "Glass Fiber/Polypropylene Composites Produced by Film Extrusion for Local Reinforcements." Key Engineering Materials 728 (January 2017): 223–28. http://dx.doi.org/10.4028/www.scientific.net/kem.728.223.

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Анотація:

Short glass fiber reinforced polypropylene films with different fiber content were produced by film extrusion using a coat-hanger die. Despite the elongation flow in the coat hanger die, a highly aligned fiber orientation in processing direction was observed. The typical increase of the tensile modulus with increasing fiber content was obtained whereas the tensile strength dropped down by incorporating small amounts of fibers. With 50 wt% fiber content the level of neat polymer film is reached again. The absence of a packing and consolidation step in compare to molding processes leads to a relative high surface roughness which increases the appearance of cracks in case of a load. For further improvement an additional pressure-related calendaring step is useful.

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44

Ivanov, K. S. "Extrusion method for producing microgranular foam-glass ceramic from zeolite rocks." NOVYE OGNEUPORY (NEW REFRACTORIES) 1, no. 3 (November 26, 2021): 29–33. http://dx.doi.org/10.17073/1683-4518-2021-3-29-33.

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45

Jeyachandran, Praveen, Srikanth Bontha, Subhadip Bodhak, Vamsi Krishna Balla, and Mrityunjay Doddamani. "Material extrusion additive manufacturing of bioactive glass/high density polyethylene composites." Composites Science and Technology 213 (September 2021): 108966. http://dx.doi.org/10.1016/j.compscitech.2021.108966.

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46

Ivanov, K. S. "Extrusion Method for Producing Microgranular Foam-Glass Ceramic from Zeolite Rocks." Refractories and Industrial Ceramics 62, no. 2 (July 2021): 157–61. http://dx.doi.org/10.1007/s11148-021-00576-7.

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47

Xue, Zugang, Shuo Liu, Zheming Zhao, Nan Mi, Bo Wu, Xing Li, Peiqing Zhang, and Xunsi Wang. "Infrared Suspended-Core Fiber Fabrication Based on Stacked Chalcogenide Glass Extrusion." Journal of Lightwave Technology 36, no. 12 (June 15, 2018): 2416–21. http://dx.doi.org/10.1109/jlt.2018.2813384.

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48

Kim, T. S., S. Y. Lee, J. K. Lee, H. J. Kim, D. H. Kim, and J. C. Bae. "Microstructure control of Cu-base metallic glass powder composites by extrusion." Materials Science and Engineering: A 449-451 (March 2007): 880–83. http://dx.doi.org/10.1016/j.msea.2006.03.143.

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49

Torres, F. G., and S. F. Bush. "Sheet extrusion and thermoforming of discrete long glass fibre reinforced polypropylene." Composites Part A: Applied Science and Manufacturing 31, no. 12 (December 2000): 1289–94. http://dx.doi.org/10.1016/s1359-835x(00)00004-x.

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50

Luo, Guojun, Gang liu, Yunlei Chen, Wenbin Liang, Guogang Liu, Yanhua Niu, and Guangxian Li. "High performance glass fiber reinforced polypropylene realized by reactive extrusion technology." Composites Science and Technology 165 (September 2018): 198–205. http://dx.doi.org/10.1016/j.compscitech.2018.07.009.

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