Mechanism of enhanced corrosion resistance against molten CMAS for pyrosilicates by high-entropy design

被引：19

作者：

Chen, Zeyu ^{[1
,2
]}

Lin, Chucheng ^{[1
]}

Zheng, Wei ^{[1
]}

Song, Xuemei ^{[1
,2
]}

Jiang, Caifen ^{[1
]}

Niu, Yaran ^{[3
]}

Zeng, Yi ^{[1
,4
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine M, Shanghai, Peoples R China

[2] Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing, Peoples R China

[3] Chinese Acad Sci, Shanghai Inst Ceram, Key Lab Inorgan Coating Mat CAS, Shanghai, Peoples R China

[4] Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine M, 1295 Dingxi Rd, Shanghai 200050, Peoples R China

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2023年 / 106卷 / 10期

关键词：

apatite; Ca; Si ratio; CMAS corrosion; environmental barrier coatings; high-entropy pyrosilicates; YTTRIUM; COATINGS; CERAMICS; GLASS;

D O I：

10.1111/jace.19192

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：

Meeting service requirements at temperatures above 1400 degrees C is challenging for the CMAS corrosion resistance of single-component pyrosilicates. This research presents a high-entropy design approach for pyrosilicates using ionic radius modulation. This method enhances pyrosilicates' resistance to CMAS corrosion by regulating the apatite's quantity formed to obstruct CMAS melt infiltration while avoiding excessive reactions. We investigated the corrosion behavior of two types of single-component pyrosilicates (Lu2Si2O7 and Yb2Si2O7) with a small ionic radius of rare-earth elements (REEs), three types of beta-type pyrosilicates ((Ho1/4Er1/4Yb1/4Lu1/4)(2)Si2O7, (Y1/5Ho1/5Er1/5Yb1/5Lu1/5)(2)Si2O7 and (Y1/6Ho1/6Er1/6Tm1/6Yb1/6Lu1/6)(2)Si2O7), and one gamma-type pyrosilicate ((Gd1/4Dy1/4Yb1/4Lu1/4)(2)Si2O7) with a larger average ionic radius of REEs at 1450-1550 degrees C. The analysis of the residual CMAS and apatite compositions showed the differences in the behavior of different REEs in the reaction with CMAS and the conditions required for the reaction to proceed.

引用

页码：6000 / 6013

页数：14

共 25 条

[21] Rare-earth pyrosilicate solid-solution environmental-barrier coating ceramics for resistance against attack by molten calcia-magnesia-aluminosilicate (CMAS) glass [J].