Ni-Cr合金钎焊单层金刚石砂轮界面结构的研究

应用科学学报 ›› 2002, Vol. 20 ›› Issue (1): 10-13.

Ni-Cr合金钎焊单层金刚石砂轮界面结构的研究

武志斌¹, 徐鸿钧¹, 姚正军¹, 肖冰¹, 傅玉灿²

1. 南京航空航天大学机电学院, 江苏南京 210016;
2. 中国科技大学材料设计与材料力学性能开放实验室, 安徽合肥 230001

收稿日期:2000-11-15 修回日期:2001-05-15 出版日期:2002-03-31 发布日期:2002-03-31
作者简介:武志斌(1964-),男,安徽淮北人,副教授,博士;徐鸿钧(1939-),男,江苏吴县人,教授,博导.
基金资助:
国家自然科学基金资助项目(59675057)

A Research on the Framework of Organization of Brazed Mono-layer Diamond Grinding Wheel with Ni-Cr Alloy

WU Zhi-bin¹, XU Hong-jun¹, YAO-Zheng-jun¹, XIAO Bing¹, FU Yu-can²

1. School of Mechanical Engineering, Nanjing University of Aeronautics & Astronautics, Nanjing 210016, China;
2. Open Lab of Material Design and Material Mechanical Properties, University of Science and Technology of China, Hefei 230001, China

Received:2000-11-15 Revised:2001-05-15 Online:2002-03-31 Published:2002-03-31

摘要/Abstract

摘要： 以Ni-Cr合金粉做钎料适当控制钎焊工艺条件,成功研制了单层钎焊金刚石砂轮.利用扫描电镜和X射线能谱,结合金相及试样逐层的X射线衍射结构分析,剖析了Ni-Cr合金与金刚石和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的浸润性及钎焊机理.钎焊过程中Ni-Cr合金中的Cr元素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及钢基体之间都有较高结合强度的主要因素,为开发新一代超硬磨料砂轮奠定了基础.

关键词: 组织结构, 单层金刚石砂轮, 钎焊

Abstract: We have successfully developed a brazed mono-layer diamond grinding wheel with Ni-Cr alloy under Ar atmosphere. SEM-EDS microanalyses have shown 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 behavior on the diamond surface by Ni-Cr alloy melt is realized through Cr₇C₃ which is produced by interaction between Cr atoms of Ni-Cr alloy and C atoms of the diamond surface at elevated temperatures.The analyses also revealed that the bond between the alloy and the steel substrate was established through a cross-diffusion of iron and chromium and the formation of (Fe_x Cr_y) C-type carbides.Finally a grinding test show ed that the wear modes of such a brazed grinding wheel were mainly grit fracture and attrition rather than grit dislodgment from the bond.

Key words: mono-layer diamond abrasive wheels, framework of organization, braz

中图分类号:

TG74
TG73

武志斌, 徐鸿钧, 姚正军, 肖冰, 傅玉灿. Ni-Cr合金钎焊单层金刚石砂轮界面结构的研究[J]. 应用科学学报, 2002, 20(1): 10-13.

WU Zhi-bin, XU Hong-jun, YAO-Zheng-jun, XIAO Bing, FU Yu-can. A Research on the Framework of Organization of Brazed Mono-layer Diamond Grinding Wheel with Ni-Cr Alloy[J]. Journal of Applied Sciences, 2002, 20(1): 10-13.