Wei Boxin, Wang Dong, Wang Yujin, Zhang Haibin, Peng Shuming, Xu Canhui, Song Guming, Zhou Yu
Institute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology Heilongjiang Harbin 150080 China
Innovation Research Team for Advanced Ceramics, Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics Sichuan Mianyang 621900 China
RSC Adv. 2018 May 17;8(32):18163-18174. doi: 10.1039/c8ra02386g. eCollection 2018 May 14.
The corrosion kinetics and mechanisms of ZrC ceramics in water vapor between 800 and 1200 °C were investigated. The results showed that there was only cubic ZrO phase in the corrosion layer when corroded at 800 °C, while a scale layer consisted of a mixture of cubic and monoclinic ZrO phases when corroded at 1000 °C and 1200 °C. A series of crystallographic relationships at the ZrC/c-ZrO interface were detected. The c-ZrO formed near the interface retained some crystallographic orientations of the initial ZrC before corrosion, presenting an "inheritance in microstructure" between c-ZrO and ZrC. The corrosion behavior mainly followed a parabolic relationship. The incremental rate of weight gain increased with increased corrosion temperature and decreased C/Zr ratio and the carbon vacancy was passive to the decrease of corrosion rate. The main corrosion controlling mechanism changed from phase boundary reactions to surface diffusion and then to grain boundary diffusion with increased temperature.
研究了800至1200℃之间ZrC陶瓷在水蒸气中的腐蚀动力学及机理。结果表明，800℃腐蚀时，腐蚀层中仅存在立方ZrO相，而在1000℃和1200℃腐蚀时，氧化皮由立方和单斜ZrO相的混合物组成。检测到ZrC/c-ZrO界面处的一系列晶体学关系。在界面附近形成的c-ZrO保留了腐蚀前初始ZrC的一些晶体学取向，呈现出c-ZrO与ZrC之间的“微观结构继承”。腐蚀行为主要遵循抛物线关系。增重速率随腐蚀温度升高、C/Zr比降低而增加，碳空位对腐蚀速率降低呈钝态。随着温度升高，主要腐蚀控制机制从相界反应转变为表面扩散，然后转变为晶界扩散。
