摘要
作者对不锈钢基体上TiO2陶瓷膜的制备技术进行了探索。试验以304不锈钢片为基体,采用溶胶-凝胶法在其表面制备TiO2陶瓷膜层,探讨了溶胶的浓度、pH值、黏合剂和烧结温度对TiO2膜层形貌的影响,并利用X射线衍射技术(XRD)研究了膜层的物相结构。结果表明,添加1%的聚乙烯醇(PVA1750)黏合剂于浓度0.07M、pH2.0的溶胶中制得涂膜液,用该涂膜液浸涂304不锈钢片,干燥后于600℃烧结,可以得到均匀的片状结构TiO2陶瓷膜,经XRD分析,该膜层以金红石相为主,另含少量锐钛矿相;添加0.3%的甲基纤维素(MC)黏合剂于浓度0.07M的溶胶中,用该溶胶浸涂304不锈钢片,干燥后于700℃烧结,得到纯金红石相的颗粒状TiO2陶瓷膜层。添加两种不同黏合剂的溶胶均可在不锈钢表面形成连续的TiO2陶瓷膜层,但两者的添加量不同,需要的烧结温度也不同,所得的物相结构及形貌亦不同。两种不同形貌的片状及颗粒结构之间分别形成较为均匀的孔隙,可以作为过滤时的截留孔。
Metallic membranes were gradually used in filtration and separation because of their high strength compared with organic and inorganic membranes; however, less reports about their preparation technology were found. In this work, the fabrication technology was studied. Sol-Gel method was used to fabricate TiOz ceramic membranes on 304 stainless steel substrates （SUS）. Some factors, such as concentration, pH value of the sol, binders and sintering temperature were explored. Two type binders （polyvinyl alcohol （PVA） and methyl cellu- lose （MC）） were used to prepare casting solutions. One casting solution marked as 1# was prepared by adding 1% PVA into 0.07M sol and adjusting its pH value to 2.0, the other marked as 2 # was prepared by adding 0.3% MC into 0. 07M sol, 304 SUS pieces were then dip-coated into the solutions. The dried pieces dip-coated into 1# solution were sintered at 600℃ and those dip-coated into 2 # were sintered at 700℃. A flake-like morphology and a grain-like morphology were obtained, respectively. Besides, the XRD results showed that the anatase and rutile phase existed in the membrane with flake-like morphology and the pure rutile phase was obtained in the membrane with grain-like morphology. Both of the casting solutions were able to form continuous TiO2 membranes on 304 SUS. The obtained two types of morphologies existed pores which can be used to filtrate. The results show that sol-gel method is a promising method to obtain membranes with pores on metal substrates.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2005年第9期1-6,共6页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家"十五"科技攻关项目(2001BA501A)
西北农林科技大学2004科研专项(04ZM056)
关键词
金属膜
陶瓷膜
不锈钢基体
TiO2陶瓷膜
膜分离
溶胶-凝胶法
metallic membrane
ceramic membrane
stainless steel substrate
titanic membrane
membrane filtration
Sol-Gel method
