氢气流量对大气等离子喷涂TiO<sub>2</sub>涂层导电性的影响

氢气流量对大气等离子喷涂TiO₂涂层导电性的影响

摘要: 采用大气等离子喷涂方法制备TiO₂涂层,研究氢气流量的变化对TiO₂涂层的显微结构、相结构以及导电性的影响.随着氢气流量的增加,TiO₂涂层的孔隙率减少,缺氧相增加,涂层的电阻率随之减小.同时在通电升温条件下涂层的电导率随温度的升高而增加.结果表明,大气等离子喷涂TiO₂涂层主要由金红石相、锐钛矿相和缺氧相Magneli(Ti_nO_2n-1,n=4~10)组成,各相的含量与等离子气中氢气的流量有关.

Abstract: TiO₂ coatings were produced by atmospheric plasma spraying system.H₂ flow rate was adjusted to investigate its effect on the microstructure, phase and electrical conductivity of TiO₂ coatings.The results show that TiO₂ coating is mainly composed of rutile, anatase and deoxidization phases Magneli(Ti_nO_2n-1, n=4-10), and the contents of them depend on H₂ flow rate.With the increasing of H₂ flow rate, porosity decreases, deoxidization phase Magneli and the electrical conductivity of coatings increase.The electrical conductivity of TiO₂ coatings also increases with temperature.