溶胶-凝胶法和固相合成法 化学专业

摘 要本文通过溶胶-凝胶法和固相合成法两种方法研究 Ca2Co2O5 氧化物热电陶瓷材料的制备过程。湿法制备前驱体粉，以 Ca（NO3）2・4H2O 和 Co（NO3）2・6H2O 为原料，纯净水为溶剂，柠檬酸为络合剂。采用溶胶-凝胶法制备 Ca2Co2O5 粉末，以 CaO 和Co3O4 为原料，采用固相合成法制备 Ca2Co2O5 粉末，采用常压烧结的方法，在1000℃、950℃、900℃三种温度下进行烧结，并利用 TG-DSC、XRD、SEM 等手段对Ca2Co2O5 的热分解过程，物相组成和形貌进行表征。结果表明：干粉 800℃热处理，湿法 950℃烧结时，块体呈现致密的片层结构，相组成成分纯度高[1～3]。关键词：溶胶凝胶法；固相混合；致密度；Ca2Co2O5 粉末.第 I 页AbstractThe preparation of ca2 co2o5 oxide thermoelectric ceramic materials was studied by sol-gel method and solid phase method. Wet preparation of precursor powder to Ca (NO3) 2 ・ 4 h2o and Co (NO3) 2 ・ 6 h2o as raw materials, pure water as the solvent, citric acid as complexing agent. Using sol-gel method Ca2Co2O5 powder to CaO and Co3O4 as raw material, USES in solid preparation Ca2Co2O5 powder method, using the method of atmospheric pressure sintering at 1000 ℃ and 950 ℃, 900 ℃, three kinds of sintering temperature, and by using TG, DSC, XRD, SEM and other means of thermal decomposition of Ca2Co2O5 phase composition and morphology were characterized. Results show that the powder 800 ℃ heat, wet 950 ℃ sintering, block present dense layer structure, phase composition of high purity.Key Words: Sol gel method; Solid phase mixing; Density; Ca2Co2O5 powder.第 II 页目 录摘 要......................................................................................................................................IAbstract...........................................................................................................................................II第 1 章 绪论.......................................................................