烧结方法对WC-Co硬质合金性能的影响  

Effect of sintering technologies on properties of WC-Co cemented carbides

作　　者：魏崇斌[1] 宋晓艳[1] 付军[1] 吕效森 陆庆忠 高杨[1] 王海滨[1] 

机构地区：[1]北京工业大学、材料科学与工程学院、新型功能材料教育部重点实验室,北京100124 [2]北京北硬硬质合金有限公司,北京100055 [3]苏州新锐硬质合金有限公司,苏州215121

出　　处：《粉末冶金材料科学与工程》2012年第3期315-320,共6页Materials Science and Engineering of Powder Metallurgy

基　　金：国家重点基础研究发展规划(973计划)资助项目(2011CB612207);国家自然科学基金资助项目(51174009);中南大学粉末冶金国家重点实验室开放课题

摘　　要：以原位还原碳化反应法制备的超细WC-Co复合粉为原料,分别采用放电等离子烧结、低压烧结和真空烧结工艺获得块体硬质合金,系统研究烧结方法对合金的显微组织、密度及力学性能的影响。结果表明:放电等离子烧结的合金中,主相为WC和Co,有少量η相(Co6W6C),低压烧结和真空烧结获得的合金中物相为WC和Co;所用3种不同的烧结方法均能获得细晶块体硬质合金,其中放电等离子烧结的晶粒最细为0.35μm;低压烧结合金具有优异的综合性能,HV30为15 121 MPa,断裂韧性为13.6 MPa.m1/2,横向断裂强度为4 210 MPa。Spark plasma sintering （SPS）, sinter-hot isostatic pressing （sinter-HIP） and vacuum sintering （VS） were carried out for densification of ultrafine WC-Co composite powder synthesized by in-situ reduction-carbonization reactions. The microstructures and properties of the WC-Co cemented carbides prepared by above different sintering processing were investigated and compared systematically. The effect of the sintering process on the phases and properties of the sintered alloys was investigated. The results show that the main phases of the cemented carbides are WC, Co and a little ~/ （Co6W6C） phase coexisting in the SPSed, while WC and Co phases in the alloys prepared by sinter-HIP and VS. The present study also shows that those sintering processes can be used for preparing cemented tungsten carbides with fine WC grains, and the SPSed alloy has the finest grain size of 0.35 pm, the sinter-HIPed one provides excellent properties with HV30 of 15 121 MPa, fracture toughness of 13.6 MPa.m1/2 and TRS of 4 210 MPa.

关 键 词：烧结工艺 硬质合金 性能 

分 类 号：TG146[一般工业技术—材料科学与工程]