氢气流量对大气等离子喷涂TiO2涂层导电性的影响
Effect of H2 flow rate on electrical conductivity of APS TiO2 coatings
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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(TinO2n-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(TinO2n-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.
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Keywords:
- TiO2 coating /
- atmospheric plasma spraying /
- H2 flow rate /
- electrical conductivity
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