Microstructural evolution of HfB2 based ceramics during oxidation at 1600-2000°C

被引：13

作者：

Jayaseelan, D. D. ^{[1
]}

Zapata-Solvas, E. ^{[1
]}

Carney, C. M. ^{[2
,3
]}

Katz, A. ^{[2
]}

Brown, P. ^{[4
]}

Lee, W. E. ^{[1
]}

机构：

[1] Univ London Imperial Coll Sci Technol & Med, Dept Mat, Ctr Adv Struct Ceram, London SW7 2AZ, England

[2] AFRL RX, Air Force Res Lab, Mat & Mfg Directorate, Dayton, OH USA

[3] UES Inc, Dayton, OH USA

[4] DSTL, Salisbury, Wilts, England

来源：

ADVANCES IN APPLIED CERAMICS | 2015年 / 114卷 / 05期

基金：

英国工程与自然科学研究理事会;

关键词：

HfB2; Oxidation; 2000 degrees C; Microstructural evolution; HIGH TEMPERATURE CERAMICS; SILICON-CARBIDE; RESISTANCE; ZRB2; DIBORIDE; DENSIFICATION; SI3N4;

D O I：

10.1179/1743676115Y.0000000018

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：

HfB2-2 wt-%-La2O3, HfB2-20 vol.-%SiC and HfB2-20 vol.-%SiC-2 wt-% La2O3 were sintered by spark plasma sintering for 5 min between 1900 and 2000 degrees C. Oxidation studies were carried out in static air on sintered ultra high temperature ceramics at 1600, 1800 and 2000 degrees C, and the weight change and microstructure changes after oxidation were examined. LaBO3 formed on the surface after oxidation for 1 h above 1600 degrees C in all La2O3 containing materials, and the cross-section microstructure shows growth of LaBO3 fibres from pores due to vapour phase reaction. Addition of La2O3 altered the oxidation kinetics of HfB2, significantly increasing the oxidation layer thickness above 1600 degrees C. However, above 1800 degrees C reaction has occurred between the sample and the zirconia crucible.

引用

页码：277 / 295

页数：19

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