Crystallization of polymer-derived SiC/BN/C composites investigated by TEM

被引：5
作者：
Bunjes, Natascha
Mueller, Anita [1 ]
Sigle, Wilfried
Aldinger, Fritz
机构：
[1] Max Planck Inst Met Res, D-70569 Stuttgart, Germany
[2] Univ Stuttgart, Inst Nichtmet Anorgan Mat, Pulvermet Lab, D-70569 Stuttgart, Germany
来源：
JOURNAL OF NON-CRYSTALLINE SOLIDS | 2007年 / 353卷 / 16-17期
关键词：
crystallization; ceramics; TEM/STEM; microstructure; nano-composites; medium-range order;
D O I：
10.1016/j.jnoncrysol.2007.01.025
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 crystallization behavior of two polymer-derived Si/B/C/N ceramics with similar compositions lying close to the three-phase field BN + SiC + C was investigated by (high-resolution) transmission electron microscopy. The materials were high-temperature mass stable up to T = 2000 degrees C. During thermolysis at 1050 degrees C a homogeneous amorphous solid formed. SiC crystallization started at about 1400 degrees C. Further annealing to higher temperatures up to 2000 degrees C led to formation of microstructures composed of SiC crystals embedded into a structured BNC, matrix phase. With increasing temperature, both the size of the crystallites and the ordering of the matrix phase increased. (C) 2007 Elsevier B.V. All rights reserved.
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页码：1567 / 1576
页数：10
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