烧结温度和粉末预处理对SPS制备超细晶硬质合金的影响  

Effects of sintering temperature and pre-treatment on ultrafine cemented carbides prepared by spark plasma sintering

作　　者：王明胜[1] 宋晓艳[1] 赵世贤[1] 张国珍[1] 张久兴[1] 

机构地区：[1]北京工业大学材料学院新型功能材料教育部重点实验室,北京100022

出　　处：《功能材料》2007年第9期1519-1522,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50671001);北京市科技新星计划资助项目(2004B04)

摘　　要：采用亚微米WC粉和微米Co粉混合粉末作为原料,利用高能球磨与放电等离子烧结(SPS)技术制备超细晶WC-10Co硬质合金。研究表明,球磨后直接烧结时,当温度由1150℃增加到1200℃,试样的晶粒尺寸和硬度没有明显变化(平均晶粒尺寸约250nm),但致密度提高至98.6%,横向断裂强度由1045MPa提高到1819MPa。当对球磨后的混合粉末进行900℃真空处理后,在较低温度烧结的条件下试样的致密度则高达99%,且横向断裂强度与未处理粉末在相同工艺下烧结获得提高。The ultrafine WC-10Co cemented carbldes were prepared by high-energy boll mnnng ana spark plasma sintering （SPS） using sub-micron WC/micron Co as the raw powder. The SPS process, mierostructure and properties of the sintered samples were investigated. The sample sintered at 1200℃ has better mechanical properties than that sintered at 1150℃, such as relative density of 98.6%, hardness of 94.0HRA, transverse rupture strength （TRS） of 1819MPa. The composite was pretreated before sintered, and the sample has better mechanical properties than the samples sintered with no pretreated composite, for example, relative density of 99.1%, TRS of 1937MPa sintered at 1150℃.

关 键 词：超细晶硬质合金 放电等离子烧结 致密度 横向断裂强度 

分 类 号：TG146[一般工业技术—材料科学与工程]