烧结工艺和粘结相对Ti(C,N)基金属陶瓷微观组织的影响  

Effects of Sintering Process and Binder Phase on Microstructure of Ti(C,N)-based Cermets

作　　者：孙万昌[1] 佘晓林 张磊 李攀[1] 

机构地区：[1]西安科技大学材料科学与工程学院,陕西西安710054 [2]中国船舶重工集团第十二研究所,陕西兴平713102

出　　处：《热加工工艺》2013年第8期1-5,共5页Hot Working Technology

基　　金：国家自然科学基金资助项目(50172023);陕西省教育厅科研计划资助项目(11JK0824);榆林市产学研合作资助项目(2012年)

摘　　要：采用真空烧结法制备了高密度Ti(C,N)基金属陶瓷,通过SEM和EDS等分析手段分别研究了烧结工艺参数和粘结相成分对Ti(C,N)基金属陶瓷显微组织和断口形貌的影响。结果表明:经1220℃保温2 h处理后的试样显微组织致密,气孔少,具有典型的"芯-环"结构且分布均匀,其断口形貌呈现出较多的韧窝和发达的撕裂棱,断口整体较为致密、层次感较强;在相同的烧结工艺下,粘结相成分为10%Ni5%Co的Ti(C,N)基金属陶瓷组织致密、晶粒细小,粘结相分散更加均匀,断裂方式主要是沿晶断裂,伴有大量断裂韧窝和发达的撕裂棱的出现。高含量Co替代Ni的Ti(C,N)基金属陶瓷试样断口形貌较为平整、发亮,具有穿晶断裂特征。Ti （C, N）-based ccrmets were successfully prepared by vacuum sintering. The effects of sintering process parameters and binder＇ s composition on the microstmcture and fracture micrograph of the Cel＇mets were studied by SEM and EDS. The results show that when soaking at 1220 ℃ for 2 h, the microstructure of typical ＂core-rim＂ is observed in the cermets, which is compact and distributed homogeneously, and there are more dimples and tearing ridges in the fracture surface, the fracture images present strong sense of hierarchy and good compactness. Using the same sintering process, Ti（C, N）-based cermets with binder content of 10%Ni5%Co has compact microstructure and fine grain, the hinder phase is dispersed more evenly, inergranular fracture, more dimples and tearing ridges appear in fracture surface. Ti （C, N）-based cermets of Co instead of high Ni content has the characteristics oftransgranular fi＇acture. The fracture surface is smooth and shiny.

关 键 词：TI(C N)基金属陶瓷 粘结相 烧结工艺 断口形貌 

分 类 号：TG148[一般工业技术—材料科学与工程]