Synthesis of nano-crystalline ZrB2/ZrC/SiC ceramics by liquid precursors

被引：36

作者：

Li, Yuntao ^{[2
]}

Han, Weijian ^{[1
]}

Li, Hao ^{[1
]}

Zhao, Jingbo ^{[2
]}

Zhao, Tong ^{[1
]}

机构：

[1] Chinese Acad Sci, Lab Adv Polymer Mat, Inst Chem, Beijing 100190, Peoples R China

[2] Beijing Univ Chem Technol, Coll Mat Sci & Engn, Beijing 100029, Peoples R China

来源：

MATERIALS LETTERS | 2012年 / 68卷

关键词：

Aerospace materials; Ceramics; Nanomaterials; MECHANICAL-PROPERTIES; SILICON-CARBIDE; COMPOSITES; SI; POLYCARBOSILANE; MICROSTRUCTURE; DENSIFICATION;

D O I：

10.1016/j.matlet.2011.10.060

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

ZrB2/ZrC/SiC precursors were prepared in a one-pot reaction of polyzirconoxanesal with boric acid and poly (methylsilylene)ethynylene. The pyrolysis of the precursors at 1400 degrees C in argon led to formation of the nanocrystalline ZrB2/ZrC/SiC ceramics. The ceramics were characterized by inductively coupled plasma (ICP), thermal gravimetric analysis (TGA), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that the ceramics were mainly composed of zirconium diboride, zirconium carbide and beta-silicon carbide phases. The average size of the ZrB2, ZrC and SiC grains was approximately 100 nm. Elemental analysis showed that the molar ratio of crystal phases was ZrB2/ZrC/SiC = 2/1.35/1, and the total weight ratio of zirconium, boride and silicon was above 81% in the ceramics. The presence of SiC obviously restrained the oxidation of ZrC and ZrB2 at 1000 degrees C. (c) 2011 Elsevier B.V. All rights reserved.

引用

页码：101 / 103

页数：3

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