成型剂对超细硬质合金质量控制的影响

Effects of Molding Agents on Quality Control of Ultrafine Cemented Carbide

本文分别以PEG、石蜡为例,研究了成型剂种类与加入方式对超细硬质合金的质量控制影响。通过对混合料中氧、压制压力以及微观组织分析,表明PEG成型剂的混合料氧含量高于石蜡混合料,且晶粒越细,差距越大;前加方式的成型剂分布均匀性优于不参与球磨的后加方式;PEG比石蜡分布更均匀。因此在增氧稳定且大小可接受的范围内,应尽量采取前加方式,使得成型剂在混合料中分布均匀,保证产品性能稳定。

The influences of the sorts of molding agent and their adding manners on the quality control of ultrafine cemented carbide were researched with taking PEG and PW for example. The examinations of oxygen content, compacting force and microstructure of mixed powder show that the oxygen content of the mixed powder with adding PEG is higher than that of adding PW. Even the finer the grain is, the greater the difference is. The distribution uniformity of the molding agent added before wet milling is better than that of added after wet milling. PEG distributes more uniformly in the mixed powder than that of PW. Consequently it is the best for the molding agent to be added before wet milling, so that the distribution of the molding agent in the mixed powder is more uniform and the increase of oxygen content is a constant and in an acceptable level, which assures the quality of products.