Effect of ZrC-doping on Microstructural and Mechanical Properties of ZTA Ceramic Composites

被引：0

作者：

Li S. ^{[1
,2
]}

Zhu Y. ^{[1
,2
]}

Guo Y. ^{[1
,2
]}

Chai J. ^{[1
,2
]}

Liu C. ^{[1
]}

Shen T. ^{[1
,2
]}

Yao C. ^{[1
]}

Cui M. ^{[1
,2
]}

Wang Z. ^{[1
]}

机构：

[1] Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, Gansu

[2] University of Chinese Academy of Sciences, Beijing

来源：

Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | 2019年 / 47卷 / 12期

关键词：

Mechanical properties; Microstructure; Zirconia toughened alumina composites; Zirconium carbide;

D O I：

10.14062/j.issn.0454-5648.2019.12.06

中图分类号：

学科分类号：

摘要：

Effect of ZrC-doping (i.e., 10%, 15%, 20%, and 25%) on the microstructural and mechanical properties of ZTA20% (zirconia-20% toughened alumina) ceramic composites was investigated. The samples were prepared via spark plasma sintering (SPS) at 1 400℃ and 40 MPa for a soaking time of 15 min. The relative density of samples measured by the Archimedes method is 99.08%. Based on the results by X-ray diffraction, the phases of the sintered samples are ZrC, α-Al2O3 and ZrO2, which are the same as the raw powders, indicating that no impurity phase is formed after sintering, and the ceramic composites have excellent chemical compatibility during sintering. According to the cross-sectional images by scanning electron microscopy, the size of various grains in the composites is uniform. Moreover, the fracture mechanism is combined with transgranular and intergranular fractures. The flexural strength first increases and then decreases with the increase of ZrC doping, thus being its maximum value of 722 MPa at 20% ZrC. The fracture toughness increases monotonically from 5.47 to 6.51 MPa•m1/2 as ZrC content increases. The microhardness of the sample is inversely proportional to ZrC content, which decreases from 17.30 to 16.19 GPa. © 2019, Editorial Department of Journal of the Chinese Ceramic Society. All right reserved.

引用

页码：1723 / 1728

页数：5

共 30 条

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