Effect of B on hot corrosion behavior of silicide coatings under different corrosive environments at 900 °C

被引：2

作者：

Chen, Guanghui ^{[1
]}

Shao, Wei ^{[1
]}

Zhou, Aohan ^{[1
]}

Zhang, Yan ^{[1
]}

Wu, Yang ^{[1
]}

Zhou, Zheng ^{[1
]}

Guo, Xingye ^{[1
]}

He, Dingyong ^{[1
,3
]}

Zhou, Chungen ^{[2
]}

机构：

[1] Beijing Univ Technol, Coll Mat Sci & Engn, Beijing 100124, Peoples R China

[2] Beihang Univ, Dept Mat Sci & Engn, Beijing 100191, Peoples R China

[3] Beijing Engn Res Ctr Ecomat & LCA, Beijing 100124, Peoples R China

来源：

SURFACE & COATINGS TECHNOLOGY | 2024年 / 489卷

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

Nb-Si based alloy; Silicide coatings; B addition; Hot corrosion; Chlorination/sulfidation reactions; SI BASED ALLOY; ULTRAHIGH TEMPERATURE ALLOYS; OXIDATION RESISTANCE; DIFFUSION COATINGS; NB; GROWTH; AL; MICROSTRUCTURE; MOSI2;

D O I：

10.1016/j.surfcoat.2024.131160

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Silicide coatings and B-modified silicide coatings were prepared on Nb-Si based alloys using halide activated pack cementation. The hot corrosion behavior of the coatings exposed to Na2SO4 2 SO 4 and Na2SO4 2 SO 4 + NaCl mixture salts at 900 degrees C was investigated. The results show that B-modified silicide coatings possess better hot corrosion resistance than the silicide coatings. The hot corrosion products of silicide coatings show a regional microstructure, including uplift regions of AlNaSiO4 4 imbedded with Al2O3 2 O 3 phases, and depressed silica regions with NaNbO3 3 and TiO2 2 particles. The addition of B to the silicide coatings promotes the formation of the uniform and dense boroaluminosilicate scale with better fluidity during hot corrosion, which impedes the self-sustaining cyclic chlorination/sulfidation reactions, and thus, improves the hot corrosion resistance of the silicide coatings.

引用

页数：17

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