An effective low-temperature strategy for sealing plasma sprayed Al2O3-based coatings

被引：31
作者：
Li, Heping [1 ]
Ke, Zhiqiang [1 ]
Li, Jing [1 ]
Xue, Lihong [1 ]
Yan, Youwei [1 ]
机构：
[1] Huazhong Univ Sci & Technol, Sch Mat Sci & Engn, State Key Lab Mat Proc & Die & Mould Technol, Wuhan 430074, Hubei, Peoples R China
来源：
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2018年 / 38卷 / 04期
关键词：
Plasma spraying method; Coatings; alpha-Al2O3; Thermal chemical reaction; AlPO4; TRITIUM PERMEATION BARRIER; CORROSION BEHAVIOR; ALUMINUM PHOSPHATE; FABRICATION; HYDROGEN; WEAR; PERFORMANCE; COMPOSITES; ALLOY;
D O I：
10.1016/j.jeurceramsoc.2017.09.051
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：
Pores and cracks are usually inevitable in the coatings fabricated by plasma spraying. Herein, thermal chemical reaction technique was developed as an effective low-temperature strategy for addressing this issue. Dense alpha-Al2O3/AlPO4 coating was synthesized on the surface of the plasma sprayed Al2O3-based coating by thermal chemical reaction at 500 degrees C. The alpha-Al2O3/AlPO4 composites permeated into the coating and effectively filled up the pores and cracks inside. The sealed coating showed a uniform and dense morphology. The hydrogen permeation rate of the sealed coating sharply decreased by a factor of 15, which further confirmed its significantly improved compactness. In addition, the coating exhibited good thermal shock resistance and bond strength after sealing. Considering its low-temperature heat treatment, facile fabrication process and wide applicability, thermal chemical reaction method can be potentially used as a cost-saving strategy for sealing plasma sprayed ceramic coatings.
引用
收藏
页码：1871 / 1877
页数：7
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