实验研究了 Ti3AlC2体材料在700~1000℃氢气氛中的热稳定性。通过 XRD、SEM、EDS、XPS 和 Raman分析手段对反应产物和材料形貌进行了表征,通过热力学软件Factsage对气体产物进行了理论模拟。在700~1000℃氢气氛(低O压)条件下,固态产物是Al2O3、TiO2和石墨,气态产物是CH4,未检测到氢化物的生成。SEM分析表明,样品表面未生成明显的孔洞和裂缝。通过Ti3AlC2临氢前后的物相及形貌变化分析结果,初步表明这种材料具有良好的抗氢性能,可能的原因是反应产物中生成的氧化物对Ti3AlC2基体起到了保护作用。
Ti3AlC2 is a new type of nano-layered machinable ceramic with numerous salient properties. Therefore, recently it is considered to be a promising candidate for new generation reactors as the key structural material. In this work, the reaction product and material morphology between nano-layered Ti3AlC2 and hydrogen were investi-gated by XRD, SEM, EDS, XPS and Raman. The resulted gaseous products were calculated by Factsage sofeware. Under the condition of 700?1000℃, hydrogen atmosphere (low oxygen pressure), solid products are Al2O3, TiO2 and C and gaseous product is CH4. Hydrides are not detected in the current experiments. The SEM results indicate that the reacted samples keep intact and cracks are not formed on the surface, indicating the high temperature ther-mal stability of Ti3AlC2 in hydrogen. These results can be attributed to the formation of oxides on the surface of specimens.
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