摘要: 在湿法球磨中通过加入高分子表面活性剂(PVA),不仅能起到助磨、防止颗粒团聚的作用，而且还使粉料颗粒形貌趋于近球形。依据 Stocks 沉降理论对金属粉和氧化铝粉分级,对分级后的和氧化铝粉进行颗粒级配，研究发现:当粗颗粒粉的粒径与细颗粒氧化铝粉的粒径之比大于 3,且粗颗粒粉的体积分数为 70% 时施以单轴向 200 MPa 的压力干压成型，其坏体的致密度高达70.24%。

关键词: 表面活性剂，致密度 ; 颗粒级配

Abstract: Not only are the particles favorable to being milled and preventedfrom agglomeration, but also does the particle’s shape result to sphericity byadding to PVA in the wet milling. According to Stocks sedimentation theory.the separated titanium and alumina powder carried through graded match. Theresult shows that the green density reaches to 70. 24% using dry press moldingunder uniaxial pressing at pressures of 200 MPa, when the ratio of diameter ofcoarse grain to fine grain exceeds 3 and the volume fraction of coarse grain is 70% .

Keywords: powder; surface modification; density