Comparative investigation of ultrafast thermal shock of Ti3AlC2 ceramic in water and air |
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Authors: | Baotong Hu Yiwang Bao Xiaojia Su Detian Wan Qingguo Feng Salvatore Grasso Chunfeng Hu |
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Affiliation: | 1. Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, China;2. State Key Laboratory of Green Building Materials, China Building Materials Academy, Beijing, China |
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Abstract: | In this work, ultrafast thermal shock of Ti3AlC2 ceramic was evaluated in water and air by utilizing the induction heating method. First, the annealed samples were heated to the set temperature in tens of seconds and dropped into the cooling water within 0.1 s which is rather short not to degrade the sample temperature. Compared to the traditional thermal shock method when quenching in water, the abnormal thermal shock phenomenon did not occur, which is owing to that no dense oxide layers were formed on the samples’ surface to act as the thermal barrier. The continuous decrease in residual flexural strength when quenched in water is associated with water infiltration, chemical reaction, and large surface tensile stress. The residual strength has 27.25 MPa upon 1250°C. Second, at the same testing temperature, the residual flexural strength when quenched in air maintains a high value of 388 MPa up to 1400°C. Dense oxide scales existed on the quenched surface of Ti3AlC2 samples. The results exhibit that Ti3AlC2 ceramic possesses excellent thermal shock resistance in water and air, suitable to be applied in extreme environments. |
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Keywords: | mechanism quenching thermal shock resistance Ti3AlC2 |
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