钎焊单层金刚石砂轮关键问题的研究

Research on the Key Problems of Brazed Bonded Monolayer Diamond Grinding Wheel

概述了用活性钎料将金刚石磨料钎焊到钢基体表面制作单层金刚石砂轮 ,比传统的单层电镀金刚石砂轮具有明显的工艺优势。分析指出了钎焊工艺现存的关键问题 ,即如何实现金刚石磨料与合金钎料层高的结合强度、钎料层厚度的均匀性和金刚石磨料的有序排布。给出了可行的解决方案 ,即利用 Ag- Cu- Cr或 Ni- Cr等活性钎料与金刚石界面化学反应生成的 Cr7C3 和 Cr2 3 C7实现钎料层与金刚石间的高强度结合 ;通过砂轮地貌优化 ,优化出磨粒排布方式 ,然后按优化的结果排布磨料。

The paper pointed out the existing key technical difficult problems,induding how to increase bond strength, how to improve the uniform of the brazing layer thickness, and how to realize regular distribution of diamond grit. Some countermeasures to solve them are discussed. Firstly, Ni-Cr or Ag-Cu-Cr alloy was used as an active filer mental for brazing diamond grit, which can provide high bond strength through Cr 7C 3 and Cr 23 C 7 produced by interaction between Cr atom of Ni-Cr or Ag-Cu-Cr alloy and C atom of diamond surface at elevated temperature. Secondly, regular grits were distributed in accordance with optimized topography. On the basis of the analyses, a diamond grit wheel with high bond strength, regular grit distribution and uniform layer thickness of the brazed alloy was developed.