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碳化帆颗粒尺寸对纳米晶硬质合金组织和性能的影响
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“973”计划研究专项课题 (2011CB612207);“863”计划主题项目 (SQ2013AAJY3168);国家自然科学基金 (51174009)


Effect of VC Particle Size on Microstructure and Mechanical Properties of Nanocrystalline WC-Co Alloy
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    摘要:

    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

    Abstract:

    The in-situ reduction and carbonization reactions were used to synthesize the WC-Co composite powder with nanoscale particle sizes. The nanocrystalline WC-Co cemented carbides bulk material was prepared by spark plasma sintering (SPS). Results show that the particle size of the grain growth inhibitor VC has a significant effect on the microstructure, grain size and properties of the prepared nanocrystalline WC-Co bulk material. When the VC particle size is below 100 nm, the prepared nanocrystalline WC-Co bulk has a mean grain size of about 70 nm. It has a high density, pure phase constitution, homogeneous grain size distribution and excellent mechanical properties, with a Vickers hardness of 19.84 GPa and a fracture toughness of 12.10 MPa×m1/2

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高 杨,宋晓艳,刘雪梅,王海滨,魏崇斌.碳化帆颗粒尺寸对纳米晶硬质合金组织和性能的影响[J].稀有金属材料与工程,2014,43(5):1224~1228.[Gao Yang, Song Xiaoyan, Liu Xuemei, Wang Haibin, Wei Chongbin. Effect of VC Particle Size on Microstructure and Mechanical Properties of Nanocrystalline WC-Co Alloy[J]. Rare Metal Materials and Engineering,2014,43(5):1224~1228.]
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  • 收稿日期:2013-05-16
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  • 在线发布日期: 2014-10-13
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