Si_(3)N_(4)/MoSi_(2)/SiC_(w)复合陶瓷刀具材料力学性能及其摩擦磨损性能  

Mechanical properties and wear properties of Si_(3)N_(4)/MoSi_(2)/SiC_(w)composite ceramic tool materials

作　　者：周后明[1] 周金虎 刘刚[1] 陈皓月 ZHOU Houming;ZHOU Jinhu;LIU Gang;CHEN Haoyue(School of Mechanical Engineering,Xiangtan University,Xiangtan 411105,China)

机构地区：[1]湘潭大学机械工程学院,湖南湘潭411105

出　　处：《功能材料》2022年第10期10196-10202,共7页Journal of Functional Materials

基　　金：国家自然科学基金(51775470,51775469);湖南省教育厅项目(21A0117);湖南省自然科学基金项目(2020JJ4585)。

摘　　要：采用真空热压烧结技术,在1650℃下制备了不同MoSi_(2)、SiC_(w)含量的Si_(3)N_(4)/MoSi_(2)/SiC_(w)(SMC)复合陶瓷刀具材料。研究了粘结相MoSi_(2)及增强相SiC_(w)含量对Si_(3)N_(4)/MoSi_(2)/SiC_(w)复合陶瓷刀具微观组织、力学性能和摩擦磨损性能的影响。结果表明,随着粘结相MoSi_(2)含量的增加,陶瓷刀具材料的抗弯强度不断增加,抗磨损能力逐渐下降,磨损形式由磨粒磨损逐渐向黏着磨损转变;随着增强相SiC_(w)含量的增加,陶瓷刀具材料的断裂韧性不断增加,抗磨损能力显著提升,磨损形式由黏着-磨粒复合磨损逐渐向磨粒磨损转变。当MoSi_(2)与SiC_(w)含量同时为10%(质量分数)时,晶粒尺寸较小,材料的致密度较高,增强了晶须的桥接与拔出效应,因此力学性能较好。此时,抗弯强度为888.21MPa,断裂韧性为10.22MPa·m^(1/2),硬度为19.17GPa。Si_(3)N_(4)/MoSi_(2)/SiC_(w)(SMC)composite ceramic tool materials with different MoSi_(2) and SiC_(w) contents were prepared by vacuum hot pressing sintering technology at 1650℃.The effects of the content of the binder phase MoSi_(2) and the reinforcing phase SiC_(w) on the microstructure,mechanical properties and friction and wear properties of Si_(3)N_(4)/MoSi_(2)/SiC_(w) composite ceramic tools were studied.The results show that with the increase of the content of MoSi_(2) content,the flexural strength of the ceramic tool material increases,the wear resistance decreases gradually,and the wear pattern gradually changes from abrasive wear to adhesive wear.With the increase of the SiC_(w) content,the fracture toughness of the ceramic tool material increases continuously,the wear resistance is significantly improved,and the wear pattern changes from adhesive-abrasive composite wear to abrasive wear.When the content of MoSi_(2) and SiC_(w) is 10 wt%at the same time,the grain size is smaller,the density of the material is higher,and the bridging and pull-out effects of whiskers are enhanced,achieving the better mechanical properties.At this time,the flexural strength was 888.21 MPa,the fracture toughness was 10.22 MPa·m^(1/2),and the hardness was 19.17 GPa.

关 键 词：陶瓷刀具 协同增韧 力学性能 微观结构 摩擦磨损 

分 类 号：TG711[金属学及工艺—刀具与模具]