BONDING INTERFACE AND WEAR BEHAVIOR OF CBN GRAINS BRAZED USING NANO-TiC POWDER MODIFIED FILLER  

纳米TiC粉末改性钎料钎焊CBN磨粒的结合界面和磨损特性(英文)

作　　者：陈珍珍[1] 徐九华[1] 丁文锋[1] 傅玉灿[1] 颜士肖[1] 

机构地区：[1]南京航空航天大学机电学院

出　　处：《Transactions of Nanjing University of Aeronautics and Astronautics》2010年第3期232-238,共7页南京航空航天大学学报（英文版）

基　　金：Supported by the National Basic Research Program of China ("973" Program) (2009CB724403);the Program for New Century Excellent Talents in University from Ministry of Education of China (NCET-07-0435);the Program for Changjiang Scholars and Innovative Research Team in University (IRT0837);the Innovative and Ex-cellent Foundation for Doctoral Dissertation of Nanjing University of Aeronautics and Astronautics (BCXJ10-08)~~

摘　　要：A new kind of composite fillers,composed of Ag-Cu-Ti alloy and nano-TiC powders,is utilized to braze cubic boron nitride （CBN） grains and tool substrate. The bonding system,including the interfacial microstructure and reactive products between CBN grains and filler layer,is observed by optical microscope and scanning electron microscope （SEM）. Resistant-to-wear experiments of the brazed grains are performed. Results show that the nano-TiC powders evenly distribute in the filler layer so that the resultants grow compactly and uniformly on the surface of CBN grain. This indicates that the chemical bond is established between CBN grains and nano-TiC modified filler. Accordingly,the bonding strength of the grains is ensured. The CBN grains are worn smoothly without grain pull-out.采用了Ag-Cu-Ti合金和纳米TiC粉末组成的新型复合钎料钎焊立方氮化硼(CBN)磨粒和工具基体,运用了三维体式显微镜和扫描电镜,研究了CBN磨粒与改性钎料之间的结合体系,包括界面微结构和反应产物,并进行了钎焊磨粒耐磨性试验。试验结果表明:加入的纳米TiC粉末均匀分布在钎料层内,细化了Ag-Cu-Ti合金钎料层的显微组织,有效控制了CBN磨粒与钎料的剧烈反应;磨粒表面化合物均匀致密,确保了CBN磨粒、纳米改性钎料和基体之间的结合强度;钎焊CBN磨粒的磨损形式以磨耗磨损为主,后期出现微小破碎,无磨粒脱落。

关 键 词：BRAZING microstructure WEAR cubic boron nitride nano-TiC powders 

分 类 号：TG580[金属学及工艺—金属切削加工及机床] TG454