Study of the mechanical properties and toughening mechanism of ZrO2 particles toughened Si3N4 ceramics
Study of the mechanical properties and toughening mechanism of ZrO2 particles toughened Si3N4 ceramics
复制标题
ZrO2颗粒增韧Si3N4陶瓷的力学性能及增韧机理研究
DOI：
10.1166/mex.2020.1695
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发表时间：
2020-06-01
影响因子：
0.7
通讯作者：
Hou, Yihui
中科院分区：
文献类型：
--
作者：
Tian, Liang;Hou, Qinglin;Hou, Yihui
Si3N4陶瓷具有耐高温、高硬度、高热稳定性等优异性能，但也存在硬度脆性高、后期加工困难等缺点。本文采用ZrO2作为增韧剂
Si3N4 ceramic has excellent properties such as high temperature resistance, high hardness, and high thermal stability, but it has the disadvantages of high hardness and brittleness and difficulty in later processing. In this paper, ZrO2 was used as toughening
phase, and ZrO2 toughened Si3N4 ceramics was prepared by injection molding. The effects of ZrO2 sintering temperature and content on the mechanical properties and fracture morphology were studied. Experiments show that when the ZrO2 content
is 10 wt.% and the sintering temperature reaches 1650 °C, the bending strength and fracture toughness of Si3N4 ceramics reach the maximum at the same time, which are 767 MPa and 8.7 MPa·m1/2, respectively. The density is high. XRD analysis revealed
that if the sintering temperature is too high, the ZrO2/Si3N4 system will generate a large number of ZrN impurity phases that cannot be phase-transformed, which ultimately affects the ceramic properties. According to fracture morphology, the toughening mechanism
of ZrO2 is stress-induced phase transition.