High-temperature diffusion behavior of ZrC in C matrix and its promotion on graphitization

Zhong wei ZHANG, Qiang ZHEN*, Feng ZHENG, Fei LU, Ce wen NAN, Rong LI, Jun shan WANG

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

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=3.382×10−11 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.

Original languageEnglish
Pages (from-to)2257-2262
Number of pages6
JournalTransactions of Nonferrous Metals Society of China (English Edition)
Volume26
Issue number8
DOIs
Publication statusPublished - 2016
Externally publishedYes

Keywords

  • ZrC
  • carbon material
  • diffusion
  • graphitization

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