CAJ | 학술논문

利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)以及力学性能测试分析，研究了不同粒度的WC和Co原始粉末经不同时间球磨后的微观形貌；并对球磨后的复合粉末添加不同配比的晶粒抑制剂，进行真空热压烧结制备了超细晶硬质合金，考察了不同配比的晶粒抑制剂对超细晶硬质合金组织和力学性能的影响。结果表明，使用原始细颗粒粉末，经较短时间的球磨处理就可以达到较好的细化效果；复合添加VC+Cr3C2或VC+TaC晶粒抑制剂对硬质合金晶粒的细化效果明显好于单一添加VC的细化效果；添加Cr3C2后WC晶粒呈近圆形，且硬质合金抗弯强度有明显提高；添加TaC后的WC晶粒呈三角形或四边形，促进了硬质合金的硬度提高。
이용소묘전자현미경(SEM)、투사전자현미경(TEM)이급역학성능측시분석，연구료불동립도적WC화Co원시분말경불동시간구마후적미관형모；병대구마후적복합분말첨가불동배비적정립억제제，진행진공열압소결제비료초세정경질합금，고찰료불동배비적정립억제제대초세정경질합금조직화역학성능적영향。결과표명，사용원시세과립분말，경교단시간적구마처리취가이체도교호적세화효과；복합첨가VC+Cr3C2혹VC+TaC정립억제제대경질합금정립적세화효과명현호우단일첨가VC적세화효과；첨가Cr3C2후WC정립정근원형，차경질합금항만강도유명현제고；첨가TaC후적WC정립정삼각형혹사변형，촉진료경질합금적경도제고。
By using scanning electron microscopy(SEM), transmission electron microscopy(TEM) and measuring mechanical behaviors, microstructures of WC and Co powders with different initial particle sizes are investigated after different times of ball milling. The ball milled composite powders with different percentage of grain growth inhibitors are vacuum hot-pressed and sintered to prepare ultra-fine grained cemented carbides and the microstructure and mechanical properties of the as-prepared cemented carbide are studied to reveal the effect of grain growth inhibitors of different proportions. The results show that the ultra-fine raw powder material has a good effect after a short time of ball milling; the grain refining effect in cemented carbide by adding VC+Cr3C2 or VC+TaC is better than that of the sole adding of VC; the WC particles has a near round shape and the bending strength of the cemented carbide can be improved by adding Cr 3C2; the WC particles take shapes of triangle or quadrilateral after adding Tac which can improve the hardness of cemented carbide.