微晶蜡对MIM多元蜡基粘结剂性能的影响  

Influence of Microcrystalline Wax on Properties of MIM Multi-Component Wax Matrix Binder

作　　者：张健[1] 黄伯云[1] 李益民[1] 李松林[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《稀有金属材料与工程》2004年第10期1084-1088,共5页Rare Metal Materials and Engineering

基　　金：国家"863" 重点资助项目(2001AA337050);国家自然科学基金重点资助项目(50044012)

摘　　要：研究了微晶蜡MW的加入对PW-EVA-HDPE蜡基粘结剂、喂料的均匀性、流变特性的影响。对比实验发现MW加入不会明显改变粘结剂的粘度,加入20%MW(质量分数)的蜡基体强度提高了5倍,体积收缩率降低到6.44%,使多元蜡基粘结剂从粗大层片状(50μm^150μm)结晶细化为均匀的微细晶(5μm^8μm);一定量的MW可以改善PW-EVA-HDPE三元蜡基粘结剂的组织均匀性和热稳定性,升高注射温度,能提高粉末装载量和粉末在粘结剂中分散的均匀性,从而提高产品的成品率和尺寸精度。The properties of PW-EVA-HDPE binder with the addition of MW were studied. It shows that the addition of MW from 1% to 30% (mass fraction) causes an increase in the tensile strength and a decrease in shrinkage of the binder. After blending PW with MW, the crystallation behavior of wax matrix changes, that is resulting in fine grain for the binder and more isotropic microstructure for the feedstock. The powder loading capacity increases and the feedstock becomes more homogeneous. The reason of the modification is also discussed.

关 键 词：金属注射成形(MIM) 微晶蜡 均匀性 

分 类 号：TF124.39[冶金工程—粉末冶金]