HfC陶瓷先驱体的制备及其性能研究

Preparation and Properties of HfC Ceramic Precursor

摘要: HfC陶瓷具有优异的耐超高温性能，在航空航天领域具有广阔的应用前景。本文以四氯化铪、乙酰丙酮、甲醇、1,4-丁二醇为原料合成了HfC陶瓷先驱体。采用元素分析、红外光谱、XPS、TG-MS等对先驱体的组成、结构及无机化过程进行了表征。结果表明：先驱体主要含有Hf、C、O、Cl元素，铪与碳以Hf-O-C键的形式相连。在无机化过程中部分碳链断裂，有大量的小分子逸出。另外采用元素分析、XRD、SEM等对陶瓷产物的组成、结构与性能进行了表征。结果表明：Ar气氛下1600℃处理后产物仍存在氧化铪相，真空条件下1200℃碳热还原发生，1600℃热处理后只有碳化铪陶瓷相。

Abstract: As an important ultra-high temperature ceramics (UHTCs), HfC ceramics have been considered to be one of the most promising materials for the application in aerospace. A precursor for HfC ceramic was prepared by using hafnium tetrachloride, methanol, acetylacetone, and 1,4-butanediol as raw materials. The composition, structure and pyrolysis process of the obtained precursor was investigated by elemental analysis, Fourier transform infrared (FTIR), XPS and TG-MS. The results show that, the precursor mainly contains Hf, C, O, Cl, with a linear structure of Hf-O-C. The compo-sition, structure and properties of the pyrolysis products were analyzed by elemental analysis, XRD and SEM. It is found that hafnia still remain in the products after being treated at 1600˚C in argon. In addition, the carbothermal reduction had started at 1200˚C, and only HfC existed after the heat treatment of 1600˚C in vacuum.