The Multishot Damage of Supersonic Plasma Sprayed Al2O3-PF Composite Coating Deposited on Insulator

Abstract

Al₂O₃-PF composite coating is effectively generated on the surface of glass fiber reinforced resin by supersonic plasma spraying technology, which prolonged the service life of traditional insulator in the small-diameter launch devices with high-density current. The thermal properties of Al₂O₃-PF composite coatings had been extensively explored. Moreover, the protective effect of Al₂O₃-PF composite coating on the traditional glass fiber reinforced resin insulator in terms of ablative carbonization, metal contamination and insulating performance during the launching process was thoroughly investigated. The results indicate that Al₂O₃-PF composite coating has attractive thermal stability. After the same number of launching tests, the metal deposition on the surface of Al₂O₃-PF composite coating is less than that of traditional glass fiber reinforced resin insulator, as is the degree of ablative carbonization at the muzzle. These factors achieve a considerable improvement in insulation performance of the insulator during the linear drive experiment. Especially after ten launching tests, surface resistivity of the Al₂O₃-PF composite coating in the acceleration section is around 10⁶ times that of the GFEP insulator. The research provides an efficient method to improve the service life and stability of traditional glass fiber reinforced resin insulator.