Comparison of hydrothermal corrosion behavior of SiC with Al2O3 and Al2O3 + Y2O3 sintering additives

被引：8

作者：

Xie, Xin ^{[1
]}

Liu, Bing ^{[2
]}

Liu, Rongzheng ^{[2
]}

Zhao, Xiaofeng ^{[1
]}

Ni, Na ^{[3
]}

Xiao, Ping ^{[4
]}

机构：

[1] Shanghai Jiao Tong Univ, Shanghai Key Lab Adv High Temp Mat & Precis Formi, Shanghai 200240, Peoples R China

[2] Tsinghua Univ, Key Lab Adv Reactor Engn & Safety, Minist Educ, Beijing, Peoples R China

[3] Shanghai Jiao Tong Univ, Gas Turbine Res Inst, Shanghai, Peoples R China

[4] Univ Manchester, Sch Mat, Manchester, Lancs, England

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2020年 / 103卷 / 03期

基金：

对外科技合作项目（国际科技项目）;

关键词：

hydrothermal corrosion; liquid phase sintering; silicon carbide; sintering additives; SILICON-CARBIDE CERAMICS; SODIUM-CHLORIDE SOLUTION; SUBCRITICAL CONDITIONS; STRUCTURAL CERAMICS; PHASE; MICROSTRUCTURE; WATER; DENSIFICATION; STRENGTH; VAPOR;

D O I：

10.1111/jace.16890

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：

Fully dense SiC bulks with Al2O3 and Al2O3 + Y2O3 sintering additives were prepared by spark plasma sintering and the effect of sintering additives on the hydrothermal corrosion behavior of SiC bulks was investigated in the static autoclave at 400 degrees C/10.3 MPa. The SiC specimen with Al2O3 sintering additive exhibited a higher weight loss and followed a linear law. However, the SiC specimen with Al2O3 + Y2O3 additive exhibited a lower weight loss and followed a parabolic law, indicating that the corrosion kinetic and mechanism were different for these two SiC bulks. Further examination revealed that, a deposited layer was formed on the surface of SiC specimen with Al2O3 + Y2O3 sintering additive after corrosion, which can effectively protect the SiC specimen from further corrosion, and thereby improved the corrosion resistance of the SiC specimen with Al2O3 + Y2O3 sintering additive.

引用

页码：2024 / 2034

页数：11

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