微波氮化烧结制备功能梯度WC-TiC-Co硬质合金及摩擦磨损性能研究  

Research on Friction Wear Properties of Functionally Gradient WC-TiC-Co Cemented Carbide Prepared by Microwave Assisted Nitriding Sintering

作　　者：肖雄[1] 刘德顺[2] 唐思文[2,3] 李鹏南[2] 

机构地区：[1]湖南科技大学机电工程学院,湖南湘潭411201 [2]湖南科技大学机械设备健康维护省重点实验室,湖南湘潭411201 [3]中南大学机电工程学院,湖南长沙410083

出　　处：《热加工工艺》2016年第10期40-43,共4页Hot Working Technology

基　　金：国家科技重大专项(2012ZX04003051);国家自然科学基金(51305134)

摘　　要：采用微波加热氮化烧结技术制备了功能梯度WC-15%TiC-6%Co硬质合金（MW-FGM-YT15）。通过扫描电镜、X射线衍射仪对试样的显微组织、相组成进行了观察,在往复式摩擦磨损试验机上,研究了在干摩擦条件下功能梯度硬质合金与合金钢GCr15对摩时的摩擦学性能,考察了摩擦速度和载荷对其摩擦磨损性能的影响。结果表明：采用微波氮化烧结处理,可快速制备功能梯度硬质合金,表面形成厚度12～19μm的层。在试验的载荷和转速范围内,随转速或载荷的增加,MW-FGM-YT15试样与YT15试样的摩擦系数均降低,但MW-FGM-YT15试样的摩擦系数低于YT15试样的摩擦系数。当F=100 N,v=800 r/min时,MW-FGM-YT15的摩擦系数μ约为0.235。Functionally gradient WC-15%TiC-6%Co cemented carbide （MW-FGM-YT15） was prepared by microwave assisted nitriding sintering technology. The microstructure and phase composition were analyzed by scanning electron microscopy （SEM/BSE） and X-ray diffractometry （XRD）. The tfibological properties of the carbide rubing with GCr15 were investigated by using friction and wear test under dry friction, and the effects of friction velocity and load on the friction and wear property of functionally gradient cemented carbide were studied. The results show that functionally gradient cemented carbide with the thickness of about 12 -19 pom gradient layers could be prepared rapidly by microwave assisted nitriding sintering technology. In the range of experimental load and rotation speed, when load and speed increase, the friction coefficient reduces, but the friction coefficient of MW-FGM-YT15 is below than YT15＇s friction coefficient. When the force is 100 N and the speed is 800 r/min, the friction coefficient of MW-FGM-YT15 is about 0.235.

关 键 词：WC-TiC-Co 硬质合金 功能梯度 微波 氮化烧结 摩擦磨损 

分 类 号：TG113.2[金属学及工艺—物理冶金]