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利用原位还原碳化反应制备纳米尺度的WC-Co复合粉体,应用放电等离子烧结(SPS)技术制备出纳米晶WC-Co硬质合金块体材料。分析了晶粒长大抑制剂碳化钒(VC)颗粒尺寸对纳米晶硬质合金的显微组织、晶粒尺寸及分布和力学性能的影响。结果表明:当VC的粒径减小到100 nm以下时,利用快速烧结技术可制备得到平均晶粒尺寸约为70 nm的致密WC-Co硬质合金块体材料,其物相纯净,晶粒尺寸分布均匀,维氏硬度为19.84 GPa,断裂韧性达到12.10 MPa·m1/2。
Nanostructured WC-Co composite powders were prepared by in-situ reduction carbonization. Nanocrystalline WC-Co cemented carbide bulk materials were prepared by spark plasma sintering (SPS). The effect of grain growth inhibitor VCV particle size on the microstructure, grain size, distribution and mechanical properties of nanocrystalline cemented carbide was analyzed. The results show that when the particle size of VC is reduced to less than 100 nm, the compact WC-Co cemented carbide bulk material with the average grain size of about 70 nm can be prepared by rapid sintering. The size distribution is uniform, Vickers hardness is 19.84 GPa and fracture toughness is 12.10 MPa · m1 / 2.