Oxidation mechanism of the Si-X (X=HfO2, Yb2O3 or HfO2+Yb2O3) composite systems in air and water vapor at 1300 °C

被引：0

作者：

Huang, Panxin ^{[1
]}

Peng, Kexue ^{[1
,2
]}

Han, Guifang ^{[1
]}

Li, Jianzhang ^{[3
]}

Xiao, Shikang ^{[1
]}

Cao, Xinxin ^{[4
]}

Zhang, Jingde ^{[1
]}

机构：

[1] Shandong Univ, Sch Mat Sci & Engn, Key Lab Liquid Solid Struct Evolut & Proc Mat, Minist Educ, Jinan 250061, Peoples R China

[2] Changji Univ, Sch Phys & Mat Sci, Xinjiang Key Lab High Value Green Utilizat Low ran, Changji 831100, Peoples R China

[3] Xian Golden Mt Ceram Composites Co LtdLtdLtdLtd, Natl Engn Res Ctr Ceram Matrix Composite Manufactu, Xian 710118, Peoples R China

[4] Shanghai Univ, Inst Mat, Shanghai 200072, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2024年 / 1005卷

关键词：

Deal-Grove model; Spheroidal Si particles; TGO thickness; Oxidation kinetics; ENVIRONMENTAL BARRIER COATINGS; THERMAL-OXIDATION; BEHAVIOR; LAYER;

D O I：

10.1016/j.jallcom.2024.176185

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The formation rate of SiO2 during oxidation of Si bond layer is a key issue to determine the lifetime of environmental barrier coatings. The oxidation kinetics and mechanism of Si and Si-X (X=HfO2, Yb2O3 or HfO2- +Yb2O3) composite systems were investigated systematically. The thickness of the SiO2 layer was greatly reduced by the dynamic formation of silicates (HfSiO4, Yb2SiO5 and Yb2Si2O7) in air and water vapor, benefiting for long-term servicing. However, the addition of HfO2 promoted the oxidation of Si with an increased total SiO2 thickness, while that of Yb2O3 not. These results provide a guidance for the design of next generation bond layers.

引用

页数：14

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