为研究Ti、Ni、Co对铝基结合剂性能的影响及结合剂对金刚石包裹情况,用热压烧结的方法制各了金刚石磨轮,采用扫描电镜研究了磨轮的断口形貌、结合剂与金刚石的界面结合以及元素的分布情况.研究表明:Al-Sn-Ti-Ni-Co是较好的结合剂体系,300℃烧结断口平坦,金刚石颗粒局部黏附有结合剂;Ti、Ni在结合剂中偏聚或形成独立相,可降低结合剂的塑性,改善结合剂的可磨削性;Co在结合剂中总体上分布均匀,有利于提高结合剂对金刚石的把持力.Al-Sn-Ti-Ni-Co结合剂对金刚石包裹较好,Ti、Ni、Co起到了改善结合剂性能的作用.
Diamond grinding wheel was prepared by hot-press process to investigate the influence of Ti,Ni,and Co on the property of Al-based bonding agent and the binding effect of bonding agent with diamond frit.Fracture morphology of the wheel,bonding effect between the agent and diamond flit,and distribution of main elements in the bonding agent were studied by SEM.Results showed that Al-Sn-Ti-Ni-Co was an acceptable bonding agent system.Fracture surface of the wheel was smooth when it was sintered at 300℃.Some of the Al-based bonding agent retained on the diamond surface.Ti and Ni segregated or formed independent phase in the agent.This would reduce the plasticity of the bonding agent and improve its grinding capability.Co distributed uniformly in the bonding agent and thus increased the retention of bonding agent to diamond.By adding Ti,Ni,and Co,the property of Al-Sn-Ti-Ni-Co bonding agent is improved.
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