Development of new WC-Ni hardmetals for use in high pressure experiments

作者：Wada Kouhei^*; Yagi Takehiko; Gotou Hirotada; Iizuka Riko; Kawakami Masaru; Kitamura Kozo; Hayashi Koji

来源：High Pressure Research, 2015, 35(3): 263-272.

DOI：10.1080/08957959.2015.1035717

• WC-Ni hardmetal
• uniaxial compression
• Paris-Edinburgh-type high pressure apparatus
• neutron diffraction
• magnetic property measurement

Ultrafine-grained (0.2-0.3 mu m) WC-Ni hardmetals with a low Ni content (3-5wt%) were developed using new production techniques based on adding an appropriate amount of VC and Cr3C2, combined with the strong mixing of raw materials. Their uniaxial compressibility was subsequently compared with that of existing WC-Ni and WC-Co hardmetals to assess their suitability for use as anvils in various high pressure experiments, particularly those associated with neutron or magnetic studies. The ultimate compressive strength of the newly developed hardmetals was over 7.7GPa, which was higher by 1.2GPa than that of the existing WC-Ni hardmetal MF10'. When these hardmetals were used as anvils, a pressure of approximately 16GPa was generated using a Paris-Edinburgh-type apparatus with phi 8mm culet, thereby proving that they can allow the physical properties of various materials to be measured at higher pressures than is possible with existing hardmetals.

• 出版日期2015-7-3