TiH_(2)的加入对Cu_(3)Sn金属间化合物金刚石砂轮磨削性能的影响  

Effect of TiH_(2)addition on grinding performance of Cu_(3)Sn intermetallic compound diamond wheels

作　　者：何珂桥 陈帅鹏 康希越 贺跃辉[1] HE Keqiao;CHEN Shuaipeng;KANG Xiyue;HE Yuehui(State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China)

机构地区：[1]中南大学,粉末冶金国家重点实验室,长沙410083

出　　处：《金刚石与磨料磨具工程》2025年第1期12-20,共9页Diamond & Abrasives Engineering

摘　　要：为进一步提升Cu_(3)Sn金属间化合物金刚石砂轮的锋利度和保形性,制备不同TiH_(2)加入量的Cu_(3)Sn金属间化合物球磨粉末、金刚石磨块及砂轮。通过对微观形貌、氧含量、物相组成、热效应、力学性能等进行测试和分析,探究TiH_(2)对Cu_(3)Sn金属间化合物金刚石砂轮磨削性能的影响。研究结果表明:TiH_(2)对Cu_(3)Sn球磨粉末有抑制增氧的作用,促进粉末烧结。当TiH_(2)的质量分数为2.0%时,氧质量分数从0.67%降低到最小值0.51%。TiH_(2)能够提高胎体对金刚石的把持力,可提高试样的抗弯强度和硬度:当TiH_(2)的质量分数为1.5%时,抗弯强度达到最大值80.74 MPa;当TiH_(2)的质量分数为2.0%时,洛氏硬度达到最大值109.88 HRB;当TiH_(2)的加入量继续增大时,抗弯强度和硬度反而下降。TiH_(2)可提升砂轮的磨削性能,磨削YG8硬质合金时,加入质量分数为2.0%的TiH_(2)使金刚石砂轮最快进给速率从0.020 mm/次提升到0.035 mm/次,磨削比从51.09提升到最大值172.03。Objectives:With the development of the modern manufacturing industry,the requirements for material machining accuracy and surface quality are increases continuously.For the precision grinding of high hardness and high wear-resistant materials,superhard material grinding wheels are required to possess high processing efficiency and durability.Intermetallic compound bond diamond grinding wheels have the wear resistance of metal grinding wheels and the self-sharpness of ceramic grinding wheels simultaneously,but they still lacks of sharpness or shape retention when machining hard and brittle materials at high loads and high speeds.To improve the sharpness and shape retention of Cu_(3)Sn intermetallic compound diamond grinding wheels,this study investigates the addition of TiH_(2).Cu_(3)Sn ball-milling powders,diamond grinding blocks,and grinding wheels with different TiH_(2)additions are prepared.Methods:The effects of TiH_(2)addition on the grinding performance of Cu_(3)Sn intermetallic diamond grinding wheels are investigated using testing and analyzing the micro-morphology,oxygen content,physical phase composition,thermal effect,and mechanical properties.Results:(1)TiH_(2)was added to the Cu_(3)Sn intermetallic compound bond,and the mixture is ball milled together.TiH_(2)inhibits the increase in oxygen content,which improves the properties of the ball-milled bond powder and facilitated the sintering process.When TiH_(2)is added with a mass fraction of 2.0%,the oxygen content is reduced from 0.67%to a minimum value of 0.51%.(2)TiH_(2)decomposes into Ti and H_(2)during the sintering process,and Ti could react with the C atoms on the surface of the diamond to form a Ti−C bond.This chemical bonding between the metal bond and diamonds could increased the bonding strength.TiH_(2)could improve the mechanical properties of diamond grinding blocks,but a larger amount of TiH_(2)increased the pores in the metal bond,which reduced its strength.When TiH_(2)mass fraction is 1.5%,the flexural strength reaches the maximum valu

关 键 词：TiH_(2) 金属间化合物 力学性能 磨削比 

分 类 号：TG74[金属学及工艺—刀具与模具]