Microwave sintering and fracture behavior of zirconia ceramics

被引：44

作者：

Chen, Yongqiang ^{[1
]}

Fan, Bingbing ^{[1
,2
]}

Yang, Bingquan ^{[1
]}

Ma, Weikui ^{[2
]}

Liu, Guoqi ^{[2
]}

Li, Hongxia ^{[1
,2
]}

机构：

[1] Zhengzhou Univ, Sch Mat Sci & Engn, Zhengzhou 450001, Henan, Peoples R China

[2] Sinosteel Luoyang Inst Refractories Res Co Ltd, Luoyang 471039, Peoples R China

来源：

CERAMICS INTERNATIONAL | 2019年 / 45卷 / 14期

基金：

国家重点研发计划; 中国国家自然科学基金;

关键词：

Zirconia ceramics; La2O3; addition; Intergranular fractures; Grain boundaries; Microwave sintering; HIGH-TEMPERATURE STABILITY; MECHANICAL-PROPERTIES; THERMAL-CONDUCTIVITY; MICROSTRUCTURE;

D O I：

10.1016/j.ceramint.2019.05.334

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Yttria and Lanthana co-stabilized zirconia ceramics were successfully prepared by microwave hybrid sintering with a multi-mode cavity at 2.45 GHz. Microhardness, bending strength, fracture toughness, and relative density were tested. The fracture behavior of 3Y-ZrO2 ceramics was studied after sintering. The results showed the average toughness values of 1550 degrees C microwave sintered and conventional sintered samples were 7.68 MPa m(1/2) and 4.31 MPa m(1/2) respectively. The average grain size of microwave sintered samples was 500 nm which was smaller than that (700 nm) of conventional sintered samples. The microstructure of fracture samples showed that the intergralnular fractures were main features for microwave sintered samples, whereas the numerous trans-granular fractures were observed in conventional sintered samples. The XRD results revealed that content of monoclinic phase gradually increase with the increasing of microwave sintering temperature in 3Y-ZrO2 samples. It was proposed that the grain boundary diffusion and induced phase transformation worked together weakening the grain boundary bonding strength under the effect of microwave field.

引用

页码：17675 / 17680

页数：6

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