放电等离子烧结Si_(3)N_(4)陶瓷刀具材料的力学摩擦性能研究  

Study on Mechanical Friction Properties of Si_(3)N_(4)Ceramic Tool Material by Spark Plasma Sintering

作　　者：史鸿铭 荆硕 巩鑫 汪振华[1] Shi Hongming;Jing Shuo;Gong Xin;Wang Zhenhua(School of Mechanical Engineering,Nanjing University of Science And Technology,Nanjing 210094,China;不详)

机构地区：[1]南京理工大学机械工程学院,南京市210094

出　　处：《工具技术》2022年第12期27-31,共5页Tool Engineering

基　　金：国家级大学生创新创业训练计划(202010288001Z)。

摘　　要：随着难加工材料在航空航天等领域的应用,能够对其进行高效、高质量加工的刀具材料的需求逐渐加大。本文主要研究了放电等离子烧结高性能氮化硅陶瓷金属切削刀具材料的致密度、硬度、断裂韧性与摩擦磨损性能,结果表明,放电等离子烧结Si_(3)N_(4)陶瓷刀具材料的硬度和韧性的分散程度较小,其致密度、维氏硬度和断裂韧性分别为99.76%,14.512GPa,7.74MPa·m^(1/2)。以Si_(3)N_(4)作为对偶摩擦副,在法向载荷不变的情况下,随着滑动摩擦速度的增加,试样进入稳定磨损阶段的时间变短,摩擦系数变化较小,磨损率呈先增大后减小的趋势。在摩擦速度不变的情况下,随着法向载荷的增加,稳定磨损阶段的摩擦系数有较大差异,而进入稳定磨损阶段的时间基本相同,磨损率呈先减小后增大的趋势。With the application of difficult-to-machine materials in aerospace and other fields,the demand for efficient performance and high-quality machining of terials is gradually increasing.In this paper,the densities,hardness,fracture toughness and frictional wear properties of high performance Si_(3)N_(4)ceramic metal cutting tool materials sintered by spark plasma are investigated,and the results showe that the dispersion of hardness and toughness of Si_(3)N_(4)ceramic tool materials by discharge plasma sintering is small,and the densities,vickers hardness and fracture toughness are 99.76%,14.512GPa,7.74MPa·m^(1/2).Taking Si_(3)N_(4)as the counterpart friction,the specimen enteres the stable wear stage with the increase of sliding friction speed,the friction coefficient changed small,and the wear rate tended to increase and then decrease under the constant normal load.In the case of constant friction speed,with the increase of normal load,the friction coefficient of the stable wear stage has a large difference,while the time to entering the stable wear stage is basically the same,and the wear rate tends to decrease first and then increase.

关 键 词：放电等离子烧结 氮化硅陶瓷 摩擦磨损 烧结温度 力学性能 

分 类 号：TG711[金属学及工艺—刀具与模具] TH117.1[机械工程—机械设计及理论]