High-temperature diffusion behavior of ZrC in C matrix and its promotion on graphitization
| Autor: | Jun-shan Wang, Zhong-wei Zhang, Ce-Wen Nan, Qiang Zhen, Feng Zheng, Fei Lu, Rong Li |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Diffusion Metals and Alloys Sintering chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Geotechnical Engineering and Engineering Geology Condensed Matter Physics 01 natural sciences 0104 chemical sciences law.invention Matrix (chemical analysis) Magazine chemistry law Materials Chemistry Graphite Composite material 0210 nano-technology Science technology and society Layer (electronics) Carbon |
| Zdroj: | Transactions of Nonferrous Metals Society of China. 26:2257-2262 |
| ISSN: | 1003-6326 |
| DOI: | 10.1016/s1003-6326(16)64345-5 |
| Popis: | 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=3.382×10−11 exp[2.029×105/(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. |
| Databáze: | OpenAIRE |
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