Title: Brazing of diamond grits with Ag-Cu-Zn alloy activated by Cr or Ti powder under different environments
Authors: Y.M. Zhou, F.L. Zhang, K.X. Fu, C.Y. Wang
Addresses: College of Mechanical and Electronic Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, PR China. ' Faculty of Mechanical and Electronic Engineering, Guangdong University of Technology, Guangzhou 510006, PR China. ' Guangzhou Productivity Promotion Center, Guangzhou 510091, PR China. ' Guangdong University of Technology, Guangzhou 510006, PR China
Abstract: In this study, Ag-Cu-Zn brazing alloy together with Cr or Ti powder had been used to braze diamond grits under different environments, such as: air, vacuum, argon gas protection, salt covering and carbon powder covering. The microstructure on the interfaces of diamond grits, brazing alloy and steel substrate was examined by Scanning Electron Microscopy (SEM) and optical microscopy. The results showed that by adding Cr powder, the diamond grits could be brazed onto the steel substrate in air and owned enough bonding strength and wear resistance when grinding granite. By adding Ti powder, the diamonds could be well brazed in vacuum or in the air with the protection of carbon powder. In brazing, the migration of Cr or Ti element to the surface of diamond and the forming of Cr or Ti rich area had significantly improved the wettability of the brazing alloy to the diamond grits.
Keywords: diamond grits; Ag-Cu-Zn alloys; microstructure; brazing alloys; steel substrates; chromium powder; bonding strength; wear resistance; grinding; titanium powder; carbon powder; wettability.
International Journal of Precision Technology, 2009 Vol.1 No.2, pp.139 - 146
Published online: 08 Jun 2009 *Full-text access for editors Access for subscribers Purchase this article Comment on this article