Ni-Cr合金钎焊金刚石砂轮机理的研究  

Research on Brazing Behaviour between Diamond Grinding Wheel and NiCr Alloy

作　　者：姚正军[1] 徐鸿钧[2] 肖冰[2] 武志斌[2] 邢芳 

机构地区：[1]南京航空航天大学材料科学与技术学院,南京市210016 [2]南京航空航天大学机电学院 [3]运城农业机电工程学校,山西省运城市044000

出　　处：《农业机械学报》2001年第4期96-98,共3页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金资助项目 (项目编号 :5 96 75 0 5 7)

摘　　要：利用扫描电镜 X射线能谱 ,结合金相及试样逐层的 X射线结构分析 ,剖析了 Ni Cr合金与金刚石、钢基体钎焊界面的微区组织结构 ;揭示了 Ni Cr合金对金刚石和钢基体表面的浸润和钎焊机理 ,即在钎焊过程中Ni Cr合金中的 Cr元素分离出 ,在金刚石界面形成富 Cr层并与金刚石表面的 C元素反应生成 Cr7C3 ,在钢基体结合界面上 Ni Cr合金和钢基体中的元素相互扩散形成冶金结合 ,这是实现合金层与金刚石。The present study shows that a commercially available NiCr alloy can be used as an active filler material for brazing diamond grit. Furnace brazing was carried out in a current of argon. SEMEDS microanalyses showed that during brazing the chromium present in the alloy segregated preferentially to the surface of the diamond to form a chromium rich reaction product. X ray diffraction revealed that the wetting and bonding behaviour on diamond surface by NiCr alloy melt was realized through Cr 7C 3 , which was produced by interaction between Cr atoms of NiCr alloy and C atoms of diamond surface at elevated temperatures. The analyses also revealed that the bond between the alloy and the steel substrate was established through a interdiffusion of iron and chromium. Finally a grinding test showed that the wear modes of such a brazed grinding wheel were mainly grit fracture and attrition rather than grit dislodgement from the bond.

关 键 词：单层钎焊 金刚石砂轮 合金材料 

分 类 号：TG743[金属学及工艺—刀具与模具]