细晶碳化钨粉末特性对硬质合金晶粒异常长粗的影响  

作　　者：马赛 

机构地区：[1]株洲硬质合金集团有限公司,湖南412000

出　　处：《数码设计》2020年第5期44-46,共3页Peak Data Science

摘　　要：硬质合金异常长粗晶粒是脆性断裂的断裂源,其对合金的机械性能影响极大。为了研究碳化钨粉末特性对合金晶粒异常长粗的影响,采用相同的钨粉作为原料,并将其分为三组进行碳化,碳化工艺分别为在T℃保温2 h、T+100℃保温1.5 h和T+140℃和1 h,从而制得三种细碳化钨粉。最后将所得碳化钨粉经相同制备工艺烧结成Co质量含量为10%的硬质合金。通过比较粉末特性以及合金组织的差异,来研究细碳化钨粉的碳化工艺对合金性能的影响。研究结果表明:不同碳化工艺制备的碳化钨粉末及其所制成的合金表现出不同的性能特性;高温短时间碳化有利于获得结晶完整、亚晶尺寸大的碳化钨粉末,其制备的合金金相组织结构均匀,减少了合金晶粒异常长大;因此,选择合理的碳化工艺制备细晶碳化钨粉,将有利于减少合金异常长粗晶粒,改善晶粒度均匀性。The abnormal grains growth of cemented carbide are the source of brittle fracture,which have a great influence on the mechanical properties of cemented carbide.In order to study the effect of the characteristics of WC powder on the abnormal grains growth,the same tungsten powder was used as raw material,and it was divided into three groups for carbonization.The carbonization process was 2 h at T℃;1.5 h at T+100℃and 1 h at T+140℃respectively,so three kinds of WC powder were prepared.Finally,tungsten carbide powder was sintered into 10%Co cemented carbide by the same process.The influences of carbonization process of WC powders on the properties of alloys were studied by comparing the differences of the characteristics of powders and micro-structure and properties of alloys.The results show that the WC powder and its alloy prepared by different carbonization processes show different properties.High temperature and short time carbonization are beneficial to obtain WC powders with complete crystal and large grain size,and the alloys micro-structure are uniform,which reduces the abnormal gain growth in the alloy.Therefore,choosing a reasonable carbonization process to prepare fine WC powder raw materials will be beneficial to meet the performance requirements of alloys in different application directions.

关 键 词：碳化工艺 结晶完整性 晶粒异常长粗 

分 类 号：F426.3[经济管理—产业经济] TG146.31[一般工业技术—材料科学与工程]