Fabrication of diamond-WC-Co composites at high temperature and high pressure
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摘要: 以质量分数为5%的金刚石微粉(平均晶粒尺寸7 μm)、90%的WC粉(平均晶粒尺寸150 nm)、5%的Co粉(平均晶粒尺寸0.9 μm)为初始材料,采用高温高压法在5.50 GPa、1 100~1 500 ℃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、1 250 ℃、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。Abstract: Diamond-WC-Co composites is prepared by using the high pressure cubic cell at 5.50 GPa and 1 100~1 500 °C for 2 min, with mass fraction of 5% diamond powder (average grain size 7 μm), 90% WC powder (average grain size 150 nm), 5% Co powder (average grain size 0.9 μm) 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 1 250 ℃ for 2 min, with a relative density of 96% and a Vickers hardness of 23.60 GPa.
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Key words:
- high temperature and high pressure /
- diamond /
- WC-Co /
- composites
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