溶胶-凝胶法CeO_2涂覆钨纤维工艺  

Process of CeO_2 coating on tungsten fibers by sol-gel method

作　　者：马运柱[1] 黄倩芳[1] 刘文胜[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《中国有色金属学报》2012年第11期3107-3112,共6页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(50774098)

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。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.

关 键 词：钨纤维 溶胶凝胶 CeO2涂层 涂覆工艺 

分 类 号：TQ342[化学工程—化纤工业]