TiC晶须增韧Si3N4基复相陶瓷的显微组织与力学性能
Microstructure and mechanical properties of TiC whisker toughened Si3N4 based composite ceramic
魏文庆 1成云飞 2毛景祥 2崔国栋 2秦旭达3
作者信息
- 1. 天津大学机械工程学院,天津 300072;潍坊学院机械与自动化学院,山东 潍坊 261061
- 2. 山东科技大学机械电子工程学院,山东 青岛 266590
- 3. 天津大学机械工程学院,天津 300072
- 折叠
摘要
以α-Si3N4为基体,TiC晶须(TiC whisker,简称TiCw)为增韧相,Al2O3、Y2O3和TiO2为烧结助剂,采用热压烧结技术制备了Si3N4-TiCw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:Si3N4基体在烧结过程中α-Si3N4相部分转变为β-Si3N4相.TiCw含量小于30vol%时均匀分布在Si3N4基体中,与Si3N4具有良好的化学相容性.加入适量的TiCw降低了Si3N4颗粒之间的表面扩散,抑制了Si3N4晶粒的异常长大,提高了复相陶瓷材料的致密度.当TiCw含量为30vol%时,Si3N4-TiCw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·m1/2,维氏硬度达到 18.412 GPa.
Abstract
Si3N4-TiCw composite ceramic materials were prepared by hot press sintering technology using α-Si3N4 as matrix,TiC whisker(TiCw for short)as toughened phase,Al2O3,Y2O3 and TiO2 as sintering additives.The effects of TiC whisker content on microstructure and mechanical properties of the Si3N4-TiCw composite ceramic materials were analyzed.The results show that the α-Si3N4 phase is partially transformed into β-Si3N4 phase during the sintering.When the content of TiCw is less than 30 vol%,it is uniformly distributed in the Si3N4 matrix,which has good chemical compatibility with Si3N4.The appropriate addition amount of TiCw can reduce the surface diffusion between Si3N4 particles and inhibit the abnormal growth of Si3N4 grains,thereby increasing the density of the composite ceramic materials.When the content of TiCw is 30 vol%,the Si3N4-TiCw 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
Si3N4/基陶瓷/TiC晶须/显微组织/力学性能Key words
Si3N4 based ceramic/TiC whisker/microstructure/mechanical property引用本文复制引用
基金项目
山东省自然科学基金(ZR2020ME001)
出版年
2024
NETL
NSTL
万方数据