Hot-corrosion behavior of Ti3SiC2 in a eutectic mixture of LiCl–KCl salts in air
Hot-corrosion behavior of Ti3SiC2 in a eutectic mixture of LiCl–KCl salts in air
复制标题
DOI：
10.1039/c4ra15580g
复制
发表时间：
2015-02
期刊：
影响因子：
3.9
通讯作者：
Ning Wang;Changming Cheng;Tian Jie;Sheng Hu;Haibin Zhang;Tao Jiang
中科院分区：
文献类型：
--
作者：
Ning Wang;Changming Cheng;Tian Jie;Sheng Hu;Haibin Zhang;Tao Jiang
乏燃料的热化学后处理需要高耐腐蚀材料。为此，研究了多晶Ti3SiC2在LiCl-KCl熔体共晶混合物中，在550℃、650℃和750℃空气中热腐蚀100 h的行为。结果表明，Ti3SiC2在550℃的LiCl-KCl中表现出优异的耐蚀性。然而，在650℃和750℃时，它经历热腐蚀，单位面积的质量增益分别约为0.4和1.6 mg cm−2。650℃和750℃时的主要腐蚀产物分别是TiO2和Li2TiO3。推测Ti3SiC2在550℃时表现出良好的耐蚀性，在650℃和750℃时氧化产物在试样表面形成稳定的保护膜是部分耐蚀性的原因。最后，利用扫描电子显微镜、能量色散x射线能谱和x射线衍射分析对腐蚀样品的显微组织和相组成进行了研究。
High-corrosion-resistant materials are required for the pyrochemical reprocessing of spent fuels. Towards this end, the hot-corrosion behavior of polycrystalline Ti3SiC2 in a eutectic mixture of LiCl–KCl melts was investigated for 100 h at 550 °C, 650 °C, and 750 °C in air. The results indicate that Ti3SiC2 exhibits excellent corrosion resistance in LiCl–KCl at 550 °C. However, it undergoes hot-corrosion at 650 °C and 750 °C, with the mass gains per unit area being approximately 0.4 and 1.6 mg cm−2, respectively. The main corrosion products at 650 °C and 750 °C were found to be TiO2 and Li2TiO3, respectively. It was surmised that Ti3SiC2 exhibits good corrosion resistance at 550 °C and is partly corrosion resistant because the oxide products form a stable protective film on the specimen surface at 650 °C and 750 °C. Finally, the microstructures and phase compositions of the corroded samples were investigated using scanning electron microscopy/energy-dispersive X-ray spectroscopy and X-ray diffraction analysis.