烧结温度对Ti-Al金属间化合物黏结剂金刚石磨块力学性能和磨削性能的影响  

Effects of sintering temperature on mechanical and grinding properties of Ti-Al intermetallic-bonded diamond grinding block

作　　者：唐洲 贺跃辉[1] 陈帅鹏 TANG Zhou;HE Yuehui;CHEN Shuaipeng(Powder Metallurgy Research Institute,Central South University,Changsha 410083,China)

机构地区：[1]中南大学粉末冶金研究院,长沙410083

出　　处：《粉末冶金材料科学与工程》2023年第3期288-295,共8页Materials Science and Engineering of Powder Metallurgy

摘　　要：用金属间化合物作为黏结剂的金刚石砂轮在磨削蓝宝石、碳化硅等领域应用广泛。黏结剂与金刚石之间的结合状态直接影响金刚石砂轮的力学和磨削性能。为了研究黏结剂和金刚石的界面结合情况,采用热压法制备Ti-Al金属间化合物黏结剂金刚石磨块,通过多种材料表征方法和摩擦磨损实验研究黏结剂与金刚石之间的界面结合状态和磨块的磨削性能。结果表明:经热压后黏结剂中生成了Ti-Al金属间化合物,且Al在金刚石表面富集从而提高黏结剂对金刚石颗粒的把持力。当烧结温度为900℃时,黏结剂对金刚石颗粒的把持力最高,磨块的力学性能和磨削性能最优,强度和硬度(HRB)最大,分别为160.48 MPa和114.4,磨削蓝宝石的磨耗比为22.3,蓝宝石表面粗糙度为1.37μm。但随着温度的进一步升高,黏结剂的过度氧化会降低磨块的磨削性能。Diamond grinding wheels with intermetallic compound as binder are widely used in grinding sapphire,silicon carbide and other fields.The binding state between binder and diamond directly affects the mechanical and grinding properties of the diamond grinding wheels.In order to study the interface binding of binder and diamond,Ti-Al intermetallic-bonded diamond grinding blocks were prepared by hot pressing,and the binding state and the grinding property of grinding blocks were studied by various material characterization methods and friction wear tests.The results show that Ti-Al intermetallic compound is generated in the binder after hot pressing,and Al will be enriched on the diamond surface to improve the holding force of the binder on the diamond particles.When the sintering temperature is 900℃,the binder has the highest holding force on diamond particles,and the mechanical and grinding properties of the grinding block are the best,the maximum strength and hardness(HRB)are 160.48 MPa and 114.4,respectively,and the abrasion radio of grinding sapphire is 22.3 and the surface roughness of sapphire is 1.37μm.However,the excessive oxidation of the binder will reduce the grinding property of the grinding block with the further increase of the temperature.

关 键 词：TI-AL 金属间化合物 黏结剂 金刚石磨块 力学性能 磨削性能 

分 类 号：TG743[金属学及工艺—刀具与模具]