Relevant bibliographies by topics / Cold sintering process

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Cold sintering process'

Author: Grafiati
Published: 28 June 2021
Last updated: 25 May 2024

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Journal articles on the topic "Cold sintering process"

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Abbas, H. O., H. A. Smeig, and Z. J. A. Ameer. "Utilizing Cold Sintering Process for Sintering Hydroxyapatite-Polyetheretherketone Nanocomposite." Archives of Materials Science and Engineering 124, no. 1 (November 1, 2023): 1–2. http://dx.doi.org/10.5604/01.3001.0054.3229.

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Yu, Tong, Jiang Cheng, Lu Li, Benshuang Sun, Xujin Bao, and Hongtao Zhang. "Current understanding and applications of the cold sintering process." Frontiers of Chemical Science and Engineering 13, no. 4 (October 18, 2019): 654–64. http://dx.doi.org/10.1007/s11705-019-1832-1.

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Abstract In traditional ceramic processing techniques, high sintering temperature is necessary to achieve fully dense microstructures. But it can cause various problems including warpage, overfiring, element evaporation, and polymorphic transformation. To overcome these drawbacks, a novel processing technique called “cold sintering process (CSP)” has been explored by Randall et al. CSP enables densification of ceramics at ultra-low temperature (⩽300°C) with the assistance of transient aqueous solution and applied pressure. In CSP, the processing conditions including aqueous solution, pressure, temperature, and sintering duration play critical roles in the densification and properties of ceramics, which will be reviewed. The review will also include the applications of CSP in solid-state rechargeable batteries. Finally, the perspectives about CSP is proposed.
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Bang, Sun Hwi, Arnaud Ndayishimiye, and Clive A. Randall. "Anisothermal densification kinetics of the cold sintering process below 150 °C." Journal of Materials Chemistry C 8, no. 17 (2020): 5668–72. http://dx.doi.org/10.1039/d0tc00395f.

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Cold sintering is an emerging non-equilibrium process methodology that densifies ceramic powder at significantly reduced temperature and time, and its sintering kinetics can be identified by controlling four densification process variables.
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Ndayishimiye, Arnaud, Mert Y. Sengul, Sun Hwi Bang, Kosuke Tsuji, Kenji Takashima, Thomas Hérisson de Beauvoir, Dominique Denux, et al. "Comparing hydrothermal sintering and cold sintering process: Mechanisms, microstructure, kinetics and chemistry." Journal of the European Ceramic Society 40, no. 4 (April 2020): 1312–24. http://dx.doi.org/10.1016/j.jeurceramsoc.2019.11.049.

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Al-Hydary, I. A. D., A. M. Abdullah, and M. A. A. Al-dujaili. "Utilizing the cold sintering process for sintering the thermally decomposable lead dioxide." Journal of the Australian Ceramic Society 56, no. 1 (November 30, 2019): 139–48. http://dx.doi.org/10.1007/s41779-019-00432-5.

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Zakaria, Marwan, Siti Rodiah Karim, and Nur Azam Badarulzaman. "XRD Analysis of Al-6vol%SnPb Composites Fabricated by Cold Forging Process with Various Sintering Temperatures." Advanced Materials Research 1087 (February 2015): 420–23. http://dx.doi.org/10.4028/www.scientific.net/amr.1087.420.

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This paper focused on fabrication of Al-6vol%SnPb from recycled Aluminium and recycled solder and its characterization in different sintering temperature. Al-20SnPb was fabricated by using cold forging process of flakes chip raw materials. Constant pressure (56.4 MPa) was used to implement cold forging process. Various sintering temperature (200 0C, 250 0C, 300 0C and 3500C) was studied to obtain the optimum hardness properties. The diffraction pattern of X-Ray diffraction (XRD) reveals the influence of varying sintering temperature of Al-6vol%SnPb. Vickers hardness result also support that, optimum result obtained is at sintering temperature 300 °C.
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Vinnichenko, Mykola, Katja Waetzig, Alf Aurich, Christoph Baumgaertner, Mathias Herrmann, Chang Won Ho, Mihails Kusnezoff, and Chang Woo Lee. "Li-Ion Conductive Li1.3Al0.3Ti1.7(PO4)3 (LATP) Solid Electrolyte Prepared by Cold Sintering Process with Various Sintering Additives." Nanomaterials 12, no. 18 (September 13, 2022): 3178. http://dx.doi.org/10.3390/nano12183178.

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The density, microstructure, and ionic conductivity of solid electrolyte Li1.3Al0.3Ti1.7(PO4)3 (LATP) ceramics prepared by cold sintering using liquid and solid sintering additives are studied. The effects of both liquid (water and water solutions of acetic acid and lithium hydroxide) and solid (lithium acetate) additives on densification are investigated. The properties of cold-sintered LATP are compared to those of conventionally sintered LATP. The materials cold-sintered at temperatures 140–280 °C and pressures 510–600 MPa show relative density in the range of 90–98% of LATP’s theoretical value, comparable or higher than the density of conventionally sintered ceramics. With the relative density of 94%, a total ionic conductivity of 1.26 × 10−5 S/cm (room temperature) is achieved by cold sintering at the temperature of 200 °C and uniaxial pressure of 510 MPa using water as additive. The lower ionic conductivities of the cold-sintered ceramics compared to those prepared by conventional sintering are attributed to the formation of amorphous secondary phases in the intergranular regions depending on the type of additives used and on the processing conditions selected.
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Ai, Yun Long, Yan Yan Li, Chang Hong Liu, Wen He, and Jia Yuan Ding. "Effect of Different Compacting Processes on the Microwave Sintering Behavior of LaNbO4/MoSi2 Composites." Advanced Materials Research 148-149 (October 2010): 1588–93. http://dx.doi.org/10.4028/www.scientific.net/amr.148-149.1588.

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The green bodies of LaNbO4/MoSi2 composite materials were compacted by warm pressing and cold pressing processes, and then the composites were prepared by microwave sintering. Effects of the two different compaction processes on sintering process and sintered samples were analyzed. The results show that the density of the microwave sintered sample by cold pressing (5.599g/cm3) is similar to that of warm pressing (5.593 g/cm3). But cold pressing has some disadvantages, such as longer sintering time, incomplete sintered samples, peeling easily on the surface and delaminating, existing internal stress, having microcrack and impurities, and occurring distortion easily in sintered samples. The samples compacted by warm pressing have higher heating rate in the microwave sintering process, which have more homogeneous structures, no clear microcrack and big cavities, and higher fracture toughness after sintering. Compared with cold pressing, the comprehensive properties of warm pressing are better.
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Ying, Yao, Linghuo Hu, Zhaocheng Li, Jingwu Zheng, Jing Yu, Wangchang Li, Liang Qiao, et al. "Preparation of Densified Fine-Grain High-Frequency MnZn Ferrite Using the Cold Sintering Process." Materials 16, no. 9 (April 28, 2023): 3454. http://dx.doi.org/10.3390/ma16093454.

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The densified MnZn ferrite ceramics were prepared using the cold sintering process under pressure, with an acetate ethanol solution used as the transient solvent. The effects of the transient solvent, the pressure and annealing temperature on the density, and the micromorphology and magnetic properties of the sintered MnZn ferrites were studied. The densified MnZn ferrite was obtained using the cold sintering process and its relative density reached up to 85.4%. The transient solvent and high pressure are essential to the cold sintering process for MnZn ferrite. The annealing treatment is indispensable in obtaining the sample with the higher density. The relative density was further increased to 97.2% for the sample annealed at 950 °C for 6 h. The increase in the annealing temperature reduces the power loss at high frequencies.
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Wang, Yan Hui, Qi Liu, Xin Wei Bo, Xiao Yu Wang, Chun Dong Jiang, and Rui Tang. "The Study on Sintering Capabilities of High Purity Metal Vanadium Powder." Key Engineering Materials 807 (June 2019): 31–36. http://dx.doi.org/10.4028/www.scientific.net/kem.807.31.

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High purity metal vanadium powder was milled by high energy ball milling, and the grain size and morphology of vanadium powder was observed by electron probe, and the stress-strain curve was measured by CMT5305 universal testing machine for research of the mechanical property. In order to investigate the effect of sintering process on the property of product, the vanadium powder was sintered by the hot pressing sintering process and the cold isostatic pressing with vacuum sintering process respectively. The experimental results show that for the cold isostatic pressing with vacuum sintering process, the density of raw compact increases with the increase of pressing pressure. When the pressure increases to 280 MPa, the density and relative density of raw compact are 3.99 g·cm-3 and 66.94% respectively, the density and relative density of product after sintering are 5.28 g·cm-3 and 88.59% respectively. With the pressure increasing from 80 MPa to 200 MPa, the compressive strength increases significantly from 0.4 MPa to 6.0 MPa, the pressure increases to 280 MPa, the compressive strength slowly increases to 7.4 MPa. For the hot pressing sintering process, the relative density of product is higher than that of cold isostatic pressing with vacuum sintering process, and the density and relative density reach to 5.51 g·cm-3 and 92.91% respectively under 280 MPa pressure.
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Dissertations / Theses on the topic "Cold sintering process"

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Hladík, Jakub. "Nové možnosti studeného slinování u pokročilých keramických materiálů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-442602.

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Servadei, Francesca. "Sviluppo di un processo di sinterizzazione a freddo per ceramici porosi di TiO2 anatasio." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/15859/.

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Questo lavoro di tesi illustra l’attività svolta presso il CNR-ISTEC di Faenza (RA), focalizzata sullo sviluppo di un processo di sinterizzazione a freddo per ceramici porosi di puro TiO2 anatasio. L’obiettivo è stato perseguito applicando il “Cold Sintering Process” (CSP), una nuova tecnica di sinterizzazione assistita dalla pressione che permette di ottenere ceramici densi a temperature molto basse (< 200 °C). A queste condizioni, utilizzando una nanopolvere di TiO2, un ambiente acquoso transiente ed un polimero termpoplastico (che agisce come fase sacrificale) è stato sviluppato un processo per ottenere strutture consolidate meso-macro-porose di TiO2 anatasio. Durante lo studio sono state sperimentate diverse variabili per indagarne l’influenza sulla micro- e macro-struttura, nonché sulla composizione e sulle caratteristiche finali dei campioni prodotti, definendo le migliori condizioni di processo. L’attività svolta ha permesso lo sviluppo di un metodo potenzialmente promettente per la realizzazione di ceramici per applicazioni in ambito catalitico.
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Dussart, Thibaut. "Batterie lithium tout solide : augmentation de la densité de courant critique et procédé innovant de fabrication." Electronic Thesis or Diss., Sorbonne université, 2021. http://www.theses.fr/2021SORUS396.

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Le premier axe de cette étude a porté sur l’augmentation de la densité de courant critique atteignable dans des cellules symétriques par la modification des certains paramètres comme la microstructure, l’interface avec le lithium ou encore la pression exercée. Nous avons montré qu’une pression exercée sur les cellules, même faible, modifie l’interface entre l’électrolyte solide et le lithium même dans le cas d’électrolyte à base d’oxyde ; une amélioration de l’ASR est observée lorsque la pression est augmentée. Une ASR aussi faible que 5 Ω.cm2 a été obtenue et une densité de courant critique de 350 µA.cm-2 a ainsi été atteinte. Le deuxième axe de ce travail a porté sur l’étude, la mise en place et l’optimisation d’un procédé de frittage permettant une densification à basse température (120 °C) : le frittage à froid. Les processus de dissolution/précipitation sont rendus possible par l’ajout d’une phase liquide qui s’évapore en partie lors du frittage et par l’application d’une pression de plusieurs centaines de MPa. Nous avons montré que l’électrolyte solide LLZO peut être densifié en ajoutant du DMF comme phase liquide. La conductivité mesurée sur l’électrolyte peut être améliorée par l’ajout d’environ 4% en masse d’un mélange polymère/sel de lithium. Ainsi, une conductivité de 2,2 × 10-4 S.cm-1 peut être obtenue à 25°C. Ensuite nous avons montré qu’une température aussi faible que 120°C permet de co-fritter le LLZO et un matériau d’électrode sans la formation de phase secondaire
The first axis of this study focused on the increase in the critical current density achievable in symmetrical cells by modifying certain parameters such as the microstructure, the interface with lithium, or the pressure evaluated. We have shown that even a low pressure on the cells modifies the interface between the solid electrolyte and lithium even in the case of an oxide-based electrolyte; an improvement in ASR is observed when the pressure is increased. An ASR as low as 5 Ω.cm2 has been obtained and a critical current density of 350 µA.cm-2 has thus been achieved. The second axis of this work focused on the study, implementation, and optimization of a sintering process allowing densification at low temperature (120 °C): the cold sintering process. The dissolution/precipitation processes are made possible by the addition of a liquid phase that partly evaporates during sintering and by the application of a pressure of several hundred MPa. We have shown that LLZO solid electrolyte can be densified by adding DMF as the liquid phase. The conductivity measured on the electrolyte can be improved by adding about 4% by weight of a polymer/lithium salt mixture. Thus, a conductivity of 2.2 × 10-4 S.cm-1 can be obtained at 25 ° C. Then we showed that a temperature as low as 120 ° C allows LLZO and an electrode material to co-sinter without the formation of a secondary phase
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Book chapters on the topic "Cold sintering process"

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Gorti, Sarma B., Adrian S. Sabau, William H. Peter, Stephen D. Nunn, Yukinori Yamamoto, and Wei Chen. "Process Simulation of Cold Pressing and Sintering of Armstrong CP-Ti Powders." In Supplemental Proceedings, 483–90. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118062111.ch54.

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Rajaei, Ali, Marco Becker, Yuanbin Deng, Oliver Schenk, Soheil Rooein, Patricia de Oliveira Löhrer, Niklas Reinisch, et al. "Materials in the Drive Chain – Modeling Materials for the Internet of Production." In Internet of Production, 1–21. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-030-98062-7_23-1.

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AbstractIn this chapter, the focus lies on a predictive description of the material response to the thermomechanical loads within different process steps by means of physical and data-driven models. The modeling approaches are demonstrated in examples of innovative production technologies for components of a drive chain: Fine blanking of parts; powder metallurgical (PM) production of gears; open-die forging and machining of drive shafts. In fine blanking, material, process, and quality data are acquired to model interactions between process and material with data-driven methods. Interpretable machine learning is utilized to non-destructively characterize the initial material state, enabling an optimization of process parameters for a given material state in the long-term. The PM process chain of the gear includes sintering, pressing, surface densification, case hardening, and finishing by grinding. Several modeling and characterization approaches are applied to quantitatively describe the microstructure evolutions in terms of porosity during sintering, density profile after cold rolling, hardness and residual stresses after heat treating and grinding and the tooth root load bearing capacity. In the example of the open-die forging, a knowledge-based approach is developed to support the decision-making process regarding the choice of the proper material and optimized pass schedules. Considering the microstructure of the forged shaft, the elastoplastic material behavior is described by a dislocation-based, multiscale modeling approach. On this basis, process simulations could be carried out to predict the process forces, chip form, residual stresses, and the tool life among other output data.
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Rajaei, Ali, Marco Becker, Yuanbin Deng, Oliver Schenk, Soheil Rooein, Patricia de Oliveira Löhrer, Niklas Reinisch, et al. "Materials in the Drive Chain – Modeling Materials for the Internet of Production." In Internet of Production, 187–207. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-44497-5_23.

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AbstractIn this chapter, the focus lies on a predictive description of the material response to the thermomechanical loads within different process steps by means of physical and data-driven models. The modeling approaches are demonstrated in examples of innovative production technologies for components of a drive chain: Fine blanking of parts; powder metallurgical (PM) production of gears; open-die forging and machining of drive shafts. In fine blanking, material, process, and quality data are acquired to model interactions between process and material with data-driven methods. Interpretable machine learning is utilized to non-destructively characterize the initial material state, enabling an optimization of process parameters for a given material state in the long-term. The PM process chain of the gear includes sintering, pressing, surface densification, case hardening, and finishing by grinding. Several modeling and characterization approaches are applied to quantitatively describe the microstructure evolutions in terms of porosity during sintering, density profile after cold rolling, hardness and residual stresses after heat treating and grinding and the tooth root load bearing capacity. In the example of the open-die forging, a knowledge-based approach is developed to support the decision-making process regarding the choice of the proper material and optimized pass schedules. Considering the microstructure of the forged shaft, the elastoplastic material behavior is described by a dislocation-based, multiscale modeling approach. On this basis, process simulations could be carried out to predict the process forces, chip form, residual stresses, and the tool life among other output data.
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Yang, Yang, Shenglin Kang, Jie Liang, Jiexin Zhang, Xuetong Zhao, Lijun Yang, and Ruijin Liao. "Effect of Cold Sintering Process on Performance of Tantalum Doped Lithium Lanthanum Zirconium Oxygen (Li6.4La3Zr1.4Ta0.6O12) Solid Electrolyte." In Lecture Notes in Electrical Engineering, 1059–66. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-1870-4_111.

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Conference papers on the topic "Cold sintering process"

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Gunawan, Ilham Gusti Wijayanto, Amir Arifin, Ganang Trycahyono, and Ani Octapia. "Study of the effect manufacturer of hydroxyapatite ceramic through cold sintering process." In TOWARD ADAPTIVE RESEARCH AND TECHNOLOGY DEVELOPMENT FOR FUTURE LIFE. AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0114344.

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Lei, Zhenyu, Jiaxin Liu, Yang Peng, and Mingxiang Chen. "Cold Sintering Process for Fabrication of a Ceramic Substrate with the Copper Layer." In 2022 23rd International Conference on Electronic Packaging Technology (ICEPT). IEEE, 2022. http://dx.doi.org/10.1109/icept56209.2022.9873311.

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Bernard, C. A., K. Ogawa, J. Y. Cavaillé, O. Lame, K. Ravi, and T. Deplancke. "On the Premise of Polymer Coating Modelling for Cold-Spray Process." In ITSC2018, edited by F. Azarmi, K. Balani, H. Li, T. Eden, K. Shinoda, T. Hussain, F. L. Toma, Y. C. Lau, and J. Veilleux. ASM International, 2018. http://dx.doi.org/10.31399/asm.cp.itsc2018p0366.

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Abstract Cold-spray process (CS) showed suitable properties to weld together compatible and incompatible materials. Since it has been intensively studied as additive technique using metallic powders on metallic surfaces, and only recently with polymeric powders, we compare, in a very preliminary attempt, simulated data of the impact of an aluminum particle onto aluminum substrate, with the case of an ultra-high molecular weight polyethylene (UHMWPE) particle on the same substrate. It is noteworthy that such polymer cannot be processed by classical means (extrusion, injection molding, etc.), and CS appears to be very promising as alternative technique to powder sintering (applicability on large surface area, surface curvature).
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Stefanovsky, S. V., A. G. Ptashkin, Y. M. Kuliako, S. A. Perevalov, S. V. Yudintsev, A. M. Chekmarev, A. V. Ochkin, and A. M. Chemarev. "Development of Actinide-Containing Waste Immobilization Process." In ASME 2003 9th International Conference on Radioactive Waste Management and Environmental Remediation. ASMEDC, 2003. http://dx.doi.org/10.1115/icem2003-4673.

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Actinide wastes involve actinide or rare earth–actinide fractions of high level waste (HLW), Pu-contaminated materials, including incinerator ashes, excess weapons plutonium, and some wastes formed during plutonium conversion in MOX fuel and nuclear accidents. SIA Radon in cooperation with Vernadsky Institute of Geochemistry, Institute of Geology of Ore Deposits, and D. Mendeleev University of Chemical Technology deals with development and testing of actinide waste forms and preparation methods. Zirconolite, pyrochlore, and murataite are considered as host phases for plutonium and other actinides. Two-phase ceramics based on zirconolite-perovskite, pyrochlore-perovskite, perovskite–cubic zirconia-based solid solution, murataite-perovskite, and zirconolite-murataite assemblages were designed for incorporation of actinide and rare earth–actinide fractions of HLW. Glass-ceramics containing apatite-britholite phases have been proposed for incinerator ash fixation. All these matrices have high chemical durability and radiation stability. The most promising method for production of these waste forms is an inductive melting in a cold crucible. Cold pressing and sintering technology is considered as alternative route. Mechanical activation intensifies ceramization process and reduces sintering temperature. Some new methods such as selfsustaining synthesis and plasma melting are being also examined.
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Tillmann, W., J. Zajaczkowski, I. Baumann, C. Schaak, D. Biermann, and M. Kipp. "Qualification of the Low-Pressure Cold Gas Spraying for the Additive Manufacturing of Copper-Nickel-Diamond Grinding Wheels." In ITSC2021, edited by F. Azarmi, X. Chen, J. Cizek, C. Cojocaru, B. Jodoin, H. Koivuluoto, Y. C. Lau, et al. ASM International, 2021. http://dx.doi.org/10.31399/asm.cp.itsc2021p0590.

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Abstract Grinding wheels are usually manufactured by powder metallurgical processes, i.e. by moulding and sintering. Since this requires the production of special moulds and the sintering is typically carried out in a continuous furnace, this process is time-consuming and cost-intensive. Therefore, it is only worthwhile for medium and large batches. Another influencing factor of the powder metallurgical process route is the high thermal load during the sintering process. Due to their high thermal sensitivity, superabrasives such as diamond or cubic boron nitride are very difficult to process in this way. In this study, a novel and innovative approach is presented, in which superabrasive grinding wheels are manufactured by thermal spraying. For this purpose, flat samples as well as a grinding wheel body were coated by low-pressure (LP) cold gas spraying with a blend of a commercial Cu-Al2O3 cold gas spraying powder and nickel-coated diamonds (8-12 μm). The coatings were examined metallographically in terms of their composition. Afterwards, the grinding wheel was conditioned for the grinding application and the topography was evaluated. This novel process route offers great flexibility in the combination of binder and hard material as well as a costeffective single-part and small-batch production.
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Scott-Emuakpor, Onome, Casey Holycross, Tommy George, Kevin Knapp, and Jeffery Bruns. "Fatigue and Strength Studies of Titanium 6Al-4V Fabricated by Direct Metal Laser Sintering." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-42891.

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Vibratory bending fatigue life behavior of Titanium (Ti) 6Al-4V plate specimens has been assessed. The plates were manufactured via direct metal laser sintering (DMLS), which is a powder bed, laser deposition additive manufacturing process. Motivation for this work is based on unprecedented performance demands for sixth generation gas turbine engine technology. For example, the inclusion of a third stream flow for improving engine performance may add complexity and weight that could offset anticipated thrust and fuel efficiency gains. Therefore, complex, lightweight components with improved functionalities are desired. Novel component design concepts have been cost, schedule, and feasibility limited when using conventional manufacturing methods. Additive manufacturing, however, can extend the thresholds of component concepts. Though additive manufacturing can be a promising addition to the turbine engine community, the manufacturing process controls required to achieve consistency in material properties have not been fully identified. The work presented in this manuscript investigates variability in vibration-based bending fatigue life of DMLS Ti 6Al-4V compared to cold-rolled Ti 6Al-4V. Results show discrepancies between the fatigue life variation of DMLS and cold-rolled data. Along with the support of fusion and post-fusion process parameters, the fatigue results are also supported by tensile property characterization, fractography, and microscopy.
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Valsecchi, Giorgio, Elena Colombini, Magdalena Lassinantti Gualtieri, Cecilia Mortalò, Silvia Deambrosis, Francesco Montagner, Valentina Zin, Enrico Miorin, Monica Fabrizio, and Paolo Veronesi. "Synthesis of Multi-Principal Element Alloys by a Conventional Powder Metallurgy Process." In Euro Powder Metallurgy 2023 Congress & Exhibition. EPMA, 2023. http://dx.doi.org/10.59499/ep235762930.

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The development of tailored microstructures of Multi-principal element alloys (MPEAs) is currently a hot topic in physical metallurgy. The most targeted systems are equimolar alloys composed of 3d transition metals including the so-called Cantor alloy (i.e. CoCrFeMnNi) and derivatives such as CoCrFeNi and CoCrFeNiAlx. Powder metallurgy is a promising route for this purpose and include manufacturing techniques such as hot pressing of mechanically activated or prealloyed powders or the less popular press-sinter route of mixed powders. In this work, cold pressing followed by fast vacuum sintering (1h) at various temperatures (Tmax =1100-1300 °C) of mixed powders of CoCrFeNi and CoCrFeNiAl0.4 were explored for the synthesis of structurally and chemically homogeneous alloys. This approach is promising for the synthesis of bulk alloys of higher purity with respect to hot pressing of mechanically prealloyed powders. Microstructural investigations were performed by X-ray Powder diffraction (XRPD) and Scanning electron microscopy (SEM). It will be shown that the reactive sintering kinetics of the investigated systems require a Tmax of 1200 °C for effective alloying at the short holding time employed for CoCrFeNi. Instead, 1300 °C is needed for CoCrFeNiAl0.4.
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URSINUS, J. "Microstructure analysis of hybrid aluminum parts from recycled EN AW-6082 and EN AW-7075 chips." In Material Forming. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902479-213.

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Abstract. In order to promote aluminum scrap recycling and reduce remelting losses, solid-state recycling processes are subject to increasing academic attention. These processes range from severe plastic deformation (SPD) to diffusion-based processes like field-assisted sintering (FAST). In this study, a FAST-based recycling route consisting of precompaction, FAST, and impact extrusion of dry machined EN AW-6082 and EN AW-7075 aluminum chips was used to create multi-material parts from different aluminum alloys. To examine the effect on the resulting part quality, two different hybrid material layouts were created during cold compaction of the chips. The subsequent sintering process took place in a field-assisted sintering (FAST) machine at 400°C and 500°C for a duration of 5 min under a pressure of 85 MPa, allowing for the analysis of inter-chip diffusion. These sintered blanks were then cold-formed by impact extrusion. Metallographic and computed tomography analyses as well as hardness measurements were performed for property evaluation before and after heat-treatment.
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Veräjänkorva, S., J. Lagerbom, and P. Vuoristo. "Influence of Powder Type and Properties on Ceramic Layer Deposition by Cold Spraying." 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.itsc2006p0215.

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Abstract:
Abstract Ceramic deposition produced by cold spraying was studied for functional surface applications. Several oxide materials and metal matrix composite (MMC) powders were used to model the behavior of ceramic powder deposition on soft metallic substrate materials. The manufacturing method, density and size of ceramic powders and matrix material of MMC were found to affect the deposition on soft metal surfaces. The powder density influences the deposition greatly and it is also an important factor in finding an ideal powder particle size. Fusing and crushing the powder can be a good manufacturing method if the fusion does not cause phase transformations in the powder. In that case, spray drying with sintering can give better results. Spraying parameters, such as the process gas parameters and the effect of multiple sweeps of the torch were also studied to optimize the amount of deposition. Cold spraying was found to be a promising manufacturing method for functional surfaces.
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10

Gao, P., G. Yang, and C. Li. "Preparation of Multimodal Structured WC-12Co Deposits by Cold Spraying." In ITSC2008, edited by B. R. Marple, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima, and G. Montavon. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 2008. http://dx.doi.org/10.31399/asm.cp.itsc2008p1202.

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Abstract Micro-structural design had attracted increasing interests in modern developments of hard coatings. The ability of cold spray process to retain the feedstock microstructure into coating makes it possible to design coating microstructure through feedstocks for development of different coating properties. In this study, a multi-size modal WC-12Co powder containing nano-sized WC particles was designed to deposit WC-Co deposition with multi-sized WC. Multimodal WC-12Co powders were prepared with ball-milling of a commercial WC-12Co powder, cold-compacting, sintering in hydrogen atmosphere and crushing. WC particle size in the powder exhibits a distribution with two peaks in tens of nanometers and several micrometers. The multimodal WC-12Co deposition was prepared by cold spraying using helium as driving gas. The multimodal size of WC particles in the powders was retained into the deposit. The micro-hardness and fracture toughness of the multimodal structured WC-12Co deposit was compared with bulk WC-12Co. It was found that the multimodal deposition exhibits a comparable hardness to nano-sized WC-12Co and a high fracture toughness compared with micro-sized WC-12Co. The simultaneous strengthening and toughening of WC-12Co can be realized through the bimodal microstructure design of WC-Co.
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