Structural and compositional analyses of oxidised layers of ZrB2-based UHTCs

被引：39
作者：
Jayaseelan, D. D. [1 ]
Zapata-Solvas, E. [1 ]
Chater, R. J. [1 ]
Lee, W. E. [1 ]
机构：
[1] Univ London Imperial Coll Sci Technol & Med, Dept Mat, Ctr Adv Struct Ceram, London SW7 2AZ, England
来源：
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2015年 / 35卷 / 15期
基金：
英国工程与自然科学研究理事会;
关键词：
UHTC; Oxidation; FIB-SIMS; TEM; Characterisation; DIBORIDE-SILICON-CARBIDE; HIGH TEMPERATURE CERAMICS; ZIRCONIUM DIBORIDE; MECHANICAL-PROPERTIES; OXIDATION-RESISTANCE; ZRB2-SIC COMPOSITES; OXIDE-FILMS; MICROSTRUCTURE; CONVECTION; EVOLUTION;
D O I：
10.1016/j.jeurceramsoc.2015.07.026
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：
ZrB2 based UHTCs (ZrB2/20 vol.% SiC) with rare earth additions (La2O3, LaB6 and Gd2O3) were oxidised for 1 hat 1600 degrees C and the oxidised layers analysed by FIB-SIMS and TEM techniques. Rare earth elements added to ZrB2/20 vol.% SiC led on oxidation to formation of a thick (up to similar to 350 mu m) protective oxide layer. Detailed cross-sectional analyses of oxidised layers revealed that they comprised of mixed crystalline and amorphous phases: m-ZrO2 and zirconates were formed on the oxidised surfaces in all samples as well as evidence of immiscible liquid. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：4059 / 4071
页数：13
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