TEM investigation of hot pressed-10 vol.% SiC-ZrB2 composite

被引：50

作者：

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

Wang, Y. ^{[1
]}

Hilmas, G. E. ^{[2
]}

Fahrenholtz, W. ^{[2
]}

Brown, P. ^{[3
]}

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] Missouri Inst Sci & Technol, Dept Mat Sci & Engn, Rolla, MO 65409 USA

[3] Def Sci & Technol Lab, Metall Team, Dept Phys Sci, Salisbury SP4 0JQ, Wilts, England

来源：

ADVANCES IN APPLIED CERAMICS | 2011年 / 110卷 / 01期

基金：

英国工程与自然科学研究理事会;

关键词：

UHTC's; Interphases; Dislocations; ZrB2; SiC; Microstructure; HIGH-TEMPERATURE CERAMICS; THERMAL-SHOCK BEHAVIOR; MECHANICAL-PROPERTIES; POLYTYPIC TRANSFORMATIONS; MICROSTRUCTURAL FEATURES; HETEROPHASE INTERFACES; OXIDATION-RESISTANCE; ZRB2-SIC COMPOSITES; GRAPHITE FLAKE; DENSIFICATION;

D O I：

10.1179/174367510X12722693956310

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：

The polytypism of SiC, phase transformation of ZrB2 and the interfaces between SiC and ZrB2 were investigated using high resolution TEM in a hot pressed 10 vol.% SiC-ZrB2 composite. In most cases, no grain boundary interphases between hexagonal ZrB2 and 6H-SiC phases were observed with SiC being both inter-and intragranular. Occasionally, 6H-SiC transformed into 3C and 15R and hexagonal ZrB2 transformed into cubic ZrB. High resolution TEM showed no grain boundary interphases in most regions. Energy dispersive X-ray spectroscopy and electron energy-loss spectroscopy analyses showed the presence of oxygen throughout the sample. The phase transformation of SiC and ZrB2, and the interphase formation between SiC and ZrB2 grains are discussed.

引用

页码：1 / 7

页数：7

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