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Jmicrovision download1/1/2024 ![]() Prilipko, “Mechanical activation of crystallization of amorphous boron and synthesis of Al 3Ti under cold isostatic pressing of B–Al–(LaB 6–TiB 2) powder,” J. Mannesson, “WC grain growth during sintering of cemented carbides,” Doctoral Thesis, Stockholm (2011), p. Redington, “Plastic deformation mechanisms in tungsten carbide,” J. Lehtinen, “On the plasticity of tungsten carbide,” Phys. Prokhorov, “Plastic stress relaxation during crack arrest in hydrostatically compressed alkali halide crystals,” Phys. Timchenko, “Effect of quasi-hydrostatic compression on the mechanical properties of ceramics in the ZrO 2 + 3 mol.% Y 2O 3 system,” Refract. JMicroVision (1 file: 28.7 MB):, last access: February 1, 2021. Part 2: Measurement of WC Grain Size, TC 119/SC 4 (2020), p. ISO 4499-2:2020, Hardmetals-Metallographic Determination of Microstructure. Part 4: Characterisation of Porosity, Carbon Defects and Eta-Phase Content, TC 119/SC 4 (2016). ISO 4499-4:2016, Hardmetals-Metallographic Determination of Microstructure. Turetskii, Encyclopedia of International Standards. Lavernia, “Processing issues for cryomilled WC–Co nanopowders,” Mater. Saritap, “Effects of powder hardness and particle size on the densification of cold isostatically pressed powders,” Turk. Mazaleyrat, “Influence of cold isostatic pressing on the magnetic properties of Ni–Zn–Cu ferrite,” AIP Adv., 8, No. ![]() Dirras, “Data on the influence of cold isostatic pre-compaction on mechanical properties of polycrystalline nickel sintered using Spark Plasma Sintering,” Data Brief, 11, 61–67 (2017). Tkach, “Effect of cold isostatic pressing on the synthesis and particle size of lanthanum manganate,” Powder Metall. Akimov, “Cold isostatic pressing as a method for fabricating ceramic products with high physicomechanical properties,” Refract. Mikhailenko, “Effects of re-pressing under high hydrostatic pressure upon the shrinkage and density of sintered VK6 hard alloy blanks,” Powder Metall. Akimov, “Self-deformation during hydrostatic compression of powders consisting of ionic-covalent single-crystals of submicron size,” Phys. Kaplan, “Cemented carbide microstructures: a review,” Int. Gusev, “Tungsten carbides: Structure, properties and application in hardmetals,” Springer Ser. This force causes deformation or fracture leading to the mechanical activation of the powder because the imperfection of its particles increases and in turn influences the properties acquired by the hardmetal.Ī.S. However, the compressive forces are not equal in quasi-isostatic compression conditions, and there is always one force that is greater than the others. Each WC particle was compressed from all sides by the neighboring WC and Co particles, resulting in quasi-isostatic compression. Those papers found that the deformation and fracture of single crystals under high isostatic pressures were accompanied by a sharp increase in the dislocation density. The results were analyzed using experimental data published previously on the effect of high isostatic pressure on the multiplication of dislocations and the fracture of single crystals. Scanning electron microscopy photographs of the indenter imprints showed massive cracking of the WC grains. Hardness measurements at different loads up to 300 N showed that hardness increased at CIP pressures up to 0.3 GPa and slightly decreased in CIP at 0.4 GPa. An intermetallic Co 0.8W 0.2 phase emerged in the samples subjected to preliminary CIP at 0.4 GPa. The Co layer became thinner with pressure being increased to 0.3 GPa and slightly thicker at a pressure of 0.4 GPa. The WC grains refined when CIP pressure increased to 0.2 GPa but slightly coarsened after CIP at 0.3 and 0.4 GPa. The coercive force increased nonmonotonically with pressure. The density of the CIP samples increased linearly with pressure prior to sintering and reached its maximum at 0.2 GPa for the sintered CIP samples. Transformer oil served as the pressure transmission medium. A multiplication installation was employed for cold isostatic pressing. The paper examines how cold isostatic pressing (CIP) of powder samples preformed by uniaxial pressing at up to 0.4 GPa influenced the density, coercive force, structure, hardness, and phase composition of the WC–8 wt.% Co (VK8) hardmetal after sintering in vacuum.
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