摘要
采用低压烧结技术制备了不同Cr含量的WC-8Co硬质合金,通过XRD、SEM和力学性能测试等手段分析了Cr含量对硬质合金物相、显微结构和合金的力学性能的影响。结果表明,当Cr含量<0.9%时,合金由WC+γ-(WC)相组成,添加量增至0.9%及以上时,组织中出现缺碳相Co3W3C;随着Cr含量的增加,WC晶粒不断细化,当添加量为0.6%时,合金的综合力学性能最佳,其抗弯强度、维氏硬度及断裂韧性分别为3885MPa、1632.4HV30、9.82MPa.m1/2。
WC-8Co cemented carbide added with different content of Cr was obtained by the low pressure sintering technology. The microstructure, phase of the alloys were studied by using scanning electron microscopy (SEM) and X-ray diffraction analysis (XRD) ,and compared the mechanical properties. The experiment results show that, when the content of Cr was inferior to 0.9%, the microstructure of alloys consisted of WC and 7 solid solution. As the content of Cr reached 0. 9%, the ternary W3Co3C phase emerged; the growth of WC grains was inhibited sufficiently. The better synthetically mechanical property was obtained by addition of 0.60%. The bending strength, Vickers hardness and fracture toughness were: 3885MPa, 1632. 4HV30, 9.82MPa · m^1/2.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2012年第23期3204-3207,共4页
Journal of Functional Materials
基金
国家自然科学基金青年科学基金资助项目(51104103
50904046)
四川省科技成果转化资助项目(2011CGZ0054)
关键词
硬质合金
显微组织
物相分析
力学性能
WC-Co cemented carbide
microstructure
phase analysis
mechanical properties