金刚石–WC–Co复合材料的高温高压合成

Fabrication of diamond-WC-Co composites at high temperature and high pressure

以质量分数为5%的金刚石微粉(平均晶粒尺寸7μm)、90%的WC粉(平均晶粒尺寸150 nm)、5%的Co粉(平均晶粒尺寸0.9μm)为初始材料,采用高温高压法在5.50 GPa、1100~1500℃保温2 min条件下制备金刚石–WC–Co复合材料。采用X射线衍射仪、拉曼光谱仪、扫描电镜、维氏硬度计对样品进行表征。合成的金刚石–WC–Co复合材料相分布均匀,金刚石颗粒紧密地烧结在硬质合金基体中;5.50 GPa、1250℃、保温2 min条件下合成的样品性能最佳,相对密度达96%,维氏硬度达23.60 GPa。

Diamond-WC-Co composites is prepared by using the high pressure cubic cell at 5.50 GPa and 1100~1500°C for 2 min,with mass fraction of 5%diamond powder(average grain size 7μm),90%WC powder(average grain size 150 nm),5%Co powder(average grain size 0.9μm)as the starting materials.The sample characterization is performed through the X-ray diffraction,Raman spectrum,scanning electron microscope and Vickers hardness tester.The synthesized diamond-WC-Co composites has a uniform phase distribution,and the diamond particles are well bonded with the cemented carbide matrix.The sample has the best performance under the thermodynamic conditions of 5.50 GPa and 1250℃for 2 min,with a relative density of 96%and a Vickers hardness of 23.60 GPa.