Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8012286 | Transactions of Nonferrous Metals Society of China | 2016 | 6 Pages |
Abstract
C/C composite material is widely used in aerospace field and others, however, it is easy to be oxidized at high temperature. In order to improve the oxidation resistance, ZrC is introduced as an oxidation inhibitor used in matrix modification of C/C composite material. Flat plate samples of ZrC/C composite materials were prepared by hot-pressing sintering. The degree of graphitization increases with rising sintering temperature, and layer structure of carbon matrix is observed clearly in the sample treated at 2273 K. Diffusion behavior of Zr in C matrix at high temperature is studied, which can be generally expressed as D=3.382Ã10â11 exp[2.029Ã105/(RT)]. The diffusion of Zr in C matrix leads to the over-saturation of C in the micro area and the oversaturated C precipitates as graphite. This continuous process promotes the transformation of carbon to graphite.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Zhong-wei ZHANG, Qiang ZHEN, Feng ZHENG, Fei LU, Ce-wen NAN, Rong LI, Jun-shan WANG,