Novel special inorganic hole-sealing agent for thermal-spraying coating as well as preparation method and application for same

Abstract

The invention discloses a novel special inorganic hole-sealing agent for a thermal-spraying coating as well as a preparation method and an application thereof. The special inorganic hole-sealing agent is prepared from the following raw materials in percentage by weight: 30-38% of SiO2, 3-8% of Al2O3, 15-19% of B2O3, 16-20% of Na2CO3, 2-5% of CaF2, 5-8% of ZnO, 2-3% of Ni2O3, 4-7% of Na5P3O10, 3-5% of TiO2 and 1% of CoO; and during preparation, the raw materials aforementioned are mixed, heated to 500-600 DEG C and insulated for 20-30 minutes, then heated to 800-900 DEG C and insulated for 1-2 hours, water-quenched, and ball-milled to obtain minus 325-mesh powder, and the powder is added in 40wt% anhydrous alcohol and then sealed and stood. The hole-sealing coating treated by the hole-sealing agent disclosed by the invention is of an amorphous structure, excellent in corrosion resistance and good in thermal stability.

Description

technical field [0001] The invention relates to an inorganic sealing agent and sealing technology for thermal spraying coatings. Aiming at thermal spraying coatings used in corrosive environments, an inorganic sealing agent and sealing agent with excellent high temperature stability and corrosion resistance are designed. Hole process, eliminating the impact of pores in the coating on corrosion resistance. Background technique [0002] Thermal spraying is a surface treatment method that impacts molten or semi-molten particles onto the surface of the substrate at high speed, deforms and deposits them, and obtains a coating with specific properties. The structure of the thermal spray coating is a lamellar structure composed of superimposed deformed particles. There must be pores between the superimposed deformed particles. This is determined by the principle of thermal spray coating formation and is unavoidable. The presence of voids in the coating will inevitably reduce the c...

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Problems solved by technology

[0004] Aiming at the technical defects of the existing sealing agent that the sealing is not resistant to high temperature, the sealing process is relatively complicated and the sealing cost is high, the present invention provides a new type of special inorganic sealing agent for thermal spray coating and its preparation method and sealing process. After the coating is sealed, it has excellent high temperature resistance and corrosion resistance, the water absorption rate of the coating is greatly reduced, and the water resistance performance is significantly improved, which will greatly improve the insulation and corrosion resistance of the ceramic coating and expand the application of the ceramic coating. range, especially in some occasions that require high temperature and high pressure resistance, corrosion resistance, and high insulation performance

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