TiC晶须增韧Si_(3)N_(4)基复相陶瓷的显微组织与力学性能  

Microstructure and mechanical properties of TiC whisker toughened Si_(3)N_(4) based composite ceramic

作　　者：魏文庆 成云飞[3] 毛景祥 崔国栋 秦旭达 WEI Wen-qing;CHENG Yun-fei;MAO Jing-xiang;CUI Guo-dong;QIN Xu-da(School of Mechanical Engineering,Tianjin University,Tianjin 300072,China;School of Mechanical and Automation,Weifang University,Weifang 261061,China;College of Mechanical and Electronic Engineering,Shandong University of Science and Technology,Qingdao 266590,China)

机构地区：[1]天津大学机械工程学院,天津300072 [2]潍坊学院机械与自动化学院,山东潍坊261061 [3]山东科技大学机械电子工程学院,山东青岛266590

出　　处：《材料热处理学报》2024年第5期48-54,共7页Transactions of Materials and Heat Treatment

基　　金：山东省自然科学基金(ZR2020ME001)。

摘　　要：以α-Si_(3)N_(4)为基体,TiC晶须(TiC whisker,简称TiC_(w))为增韧相,Al_(2)O_(3)、Y_(2)O_(3)和TiO_(2)为烧结助剂,采用热压烧结技术制备了Si_(3)N_(4)-TiC_(w)复相陶瓷材料,分析了TiC晶须含量对其显微组织及力学性能的影响。结果表明:Si_(3)N_(4)基体在烧结过程中α-Si_(3)N_(4)相部分转变为β-Si_(3)N_(4)相。TiC_(w)含量小于30 vol%时均匀分布在Si_(3)N_(4)基体中,与Si_(3)N_(4)具有良好的化学相容性。加入适量的TiC_(w)降低了Si_(3)N_(4)颗粒之间的表面扩散,抑制了Si_(3)N_(4)晶粒的异常长大,提高了复相陶瓷材料的致密度。当TiC_(w)含量为30 vol%时,Si_(3)N_(4)-TiC_(w)复相陶瓷材料的性能最佳,致密度达到97.71%,抗弯强度达到720.463 MPa,断裂韧性达到7.6 MPa·m^(1/2),维氏硬度达到18.412 GPa。Si_(3)N_(4)-TiC_(w) composite ceramic materials were prepared by hot press sintering technology using α-Si_(3)N_(4) as matrix,TiC whisker(TiC_(w) for short)as toughened phase,Al_(2)O_(3),Y_(2)O_(3) and TiO_(2) as sintering additives.The effects of TiC whisker content on microstructure and mechanical properties of the Si_(3)N_(4)-TiC_(w) composite ceramic materials were analyzed.The results show that the α-Si_(3)N_(4) phase is partially transformed into β-Si_(3)N_(4) phase during the sintering.When the content of TiC_(w) is less than 30 vol%,it is uniformly distributed in the Si_(3)N_(4) matrix,which has good chemical compatibility with Si_(3)N_(4).The appropriate addition amount of TiC_(w) can reduce the surface diffusion between Si_(3)N_(4) particles and inhibit the abnormal growth of Si_(3)N_(4) grains,thereby increasing the density of the composite ceramic materials.When the content of TiC_(w) is 30 vol%,the Si_(3)N_(4)-TiC_(w) composite ceramic material has the best performance,with the density of 97.71%,the flexural strength of 720.463 MPa,the fracture toughness of 7.6 MPa·m1/2,and the Vickers hardness of 18.412 GPa.

关 键 词：Si_(3)N_(4)基陶瓷 TiC晶须 显微组织 力学性能 

分 类 号：TQ174.7[化学工程—陶瓷工业]