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制备钛酸钡粉体主要有两种方法,目前还没有文献对两种制备方法进行系统比较,本文采用两种方法即溶胶凝胶法和固相反应法制备钛酸钡粉体,并对粉体的微观形貌和相组成进行比较分析,结果表明两种方法均能成功制备钛酸钡粉体,而溶胶凝胶法制备的粉体由于颗粒细小均匀,因此性能优于固相反应法制备的粉体。分别将两种方法所得粉体经成型烧结制备陶瓷,并对其进行性能检测和微观形貌观察,结果表明采用溶胶凝胶法所得粉体制备的陶瓷由于晶粒发育良好、结构紧密及气孔较少,因此具有较高的体积密度及优良的PTC性能,其体积密度ρ=3.11g/cm3,室温电阻率ρ=60Ω.cm,电阻温度系数α25=16.7%.℃-1。
Preparation of barium titanate powder There are two main methods, there is no literature comparison of the two preparation methods, this paper uses two methods of sol-gel method and solid-state reaction method to prepare barium titanate powder, and powder The results showed that both of the two methods can successfully prepare barium titanate powders. However, the powders prepared by sol-gel method are superior to those prepared by solid-phase reaction because of the fine and uniform particles. Powder. The powders obtained by the two methods were respectively sintered by sintering to prepare ceramics. The properties of the ceramics were observed and the microstructure was observed. The results show that the ceramics prepared by the sol-gel method have good grain growth, compact structure and porosity Less bulk density and excellent PTC performance. The bulk density ρ = 3.11g / cm3, the room temperature resistivity ρ = 60Ω.cm, the temperature coefficient of resistance α25 = 16.7%. ℃ -1.