(中南大学 粉末冶金国家重点实验室，长沙 410083)
摘 要: 以硝酸铈作为原料，采用溶胶−凝胶法对预处理后的钨纤维进行CeO2涂覆改性，探讨Ce溶胶的制备工艺，研究溶胶特性、煅烧温度、升温速度以及涂覆层数对涂覆效果的影响。采用红外光谱 (FT-IR)分析Ce溶胶的特征基团，X射线衍射(XRD)分析Ce凝胶煅烧后的物相组成，扫描电镜(SEM)分析CeO2涂层纤维的微观形貌，电子能谱仪(EDS)分析涂层纤维的物质组成。结果表明：溶胶制备中加入二甲基乙酰胺(DMAC)可提高溶胶稳定 性，有利于钨纤维的涂覆改性；在真空气氛中，采用1 ℃/min的升温速度并在600 ℃煅烧2 h的一次涂覆工艺，制备了均匀、致密、完整的CeO2涂层。
关键字: 钨纤维；溶胶−凝胶；CeO2涂层；涂覆工艺
（State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:Taking the cerium nitrate as raw material, CeO2 coating on the pretreated tungsten fiber was fabricated by sol-gel method. The preparation process of Ce sol was explored, and coating effects were studied systematically via variable conditions, such as sol characteristics, calcination temperature, heating rate and coating layers. The characteristic functional groups of the sol were analyzed by FT-IR, the phase composition of Ce gel after calcining was analyzed by XRD, the microstructure and composition of the CeO2 coated tungsten fibers were characterized by SEM and EDS, respectively. The results show that, during the sol preparation, DMAC addition can enhance the stability of the sol and improve the effect of CeO2 coating on tungsten fiber. The uniform, dense and complete CeO2 coating can be obtained after being coated only once under the conditions of calcining at 600 ℃ for 2 h and heating rate of 1 ℃/min in the vacuum atmosphere.
Key words: tungsten fiber; sol-gel method; CeO2 coating; coating process
