【摘要】 分别采用Williamson-Hall和单轴压缩法研究经气流粉碎和球磨处理后的超细WC粉体的微观应变及其应力-应变关系,并研究WC粉体中团粒破碎行为。以采用不同处理方法得到的WC粉体为原料制备WC-10%Co硬质合金,并对其性能进行分析。结果表明:相较于球磨处理得到WC粉体,经气流粉碎处理得到的WC粉体的微观应变显著降低;由于粉体中团粒的消除和晶格应变的减小,采用气流粉碎的WC粉体制备的硬质合金具备更加优良的综合性能,其抗弯强度达到4260 MPa。更多还原

【Abstract】 The Williamson-Hall and uniaxial compression methods were used to study the variations of the micro-strain and stress-strain relations in WC powders after jet milling and ball milling, respectively. The rupture behavior of agglomerates in WC powders was investigated. Meanwhile, the as-obtained WC powders treated by different milling methods were used to fabricate WC-10%Co cemented carbides, followed by the performance assessment of cemented carbides. The results show that the micro-strain of the jet-milled WC powders decreases significantly compared with that of the ball-milled WC powders, and that the cemented carbides prepared by jet-milled WC powders exhibit excellent properties with a transverse-rupture strength of 4260 MPa, due to the elimination of agglomerates and the reduction of lattice strain.更多还原