高频感应钎焊金刚石磨粒剪切失效的试验研究

Experimental study on the shearing failure of high frequency induction brazed diamond abrasive

针对镍基和银基2种常用钎料体系,根据活性元素的不同分别选择了4种不同钎料,利用高频感应加热方式钎焊金刚石磨粒,对钎焊的金刚石磨粒试样进行推剪试验,用高速摄像仪记录金刚石失效过程,观察剪切后的试样形貌,并跟踪剪切过程中力的变化。根据试验结果建立钎焊金刚石磨粒的剪切失效模型。研究结果表明:钎焊金刚石磨粒的剪切失效主要包括金刚石磨粒的剪断及金刚石磨粒的滑移2类;剪切失效与金刚石的热损伤、钎料的力学性能有密切的关系。所提出的剪切失效模型与试验结果能较好吻合。

Four different filler alloys were selected according to the different active elements from two common solder systems of Ni base and Ag base.The diamond abrasive grains were brazed on steel with high frequency induction heating and were sheared with pushing experiment.Diamond failure process was recorded with high-speed camera in the shear process.The forces in the shear process were also recorded.The fracture features of diamond grains were observed.The diamond abrasive thermal damage and mechanical properties of filler alloys strength were also measured in this paper.The experiment results indicated that the main shear failure of diamond abrasive mainly include shear fracture and shear slip.The diamond abrasive thermal damage and mechanical strength of filler alloys have a close relationship with the abrasive failure.According to the experiment results,the established shear failure model of brazed diamond abrasive is in good agreement with the experiment results.