Fused alumina zirconia alcohol based casting coating and preparation method thereof

Abstract

The invention discloses a fused alumina zirconia alcohol based casting coating and a preparation method thereof. The casting coating is prepared from, by weight, 48-50 parts of zircon powder, 95-100 parts of vice-white fused alumina powder, 2.7 parts of lithium based bentonite, 3.6 parts of phenolic resin, 7 parts of lime powder, 4 parts of iron oxide red powder, 1.5 parts of dextrin and 55-60 parts of ethyl alcohol, wherein the grain size of refractory powder ranges from 240 meshes to 330 meshes. The preparation method includes dissolving phenolic resin with ethyl alcohol completely, mixing lithium based bentonite with water to obtain a pastry mixture, pressing the mixture repeatedly, adding in ethyl alcohol with stirring uniformly, processing through a high-speed disperser for 20 minutes, fully stirring the refractory powder, dextrin, the phenolic resin solution, the lithium based bentonite paste, ethyl alcohol and the like in a stirring machine, and processing for 60 minutes by thehigh-speed disperser. The coating is used for pouring of stainless steel castings and alloy steel castings, has good suspension stability, high fire resistance performance, high stability without layering or cracking under high-temperature impact, excellent thixotropy and levelling property, good coating performance and low gas evolution; adding of iron oxide red facilitates caking and sand stripping of the surfaces of castings, and thus, good sand-adhering resistance performance and high coating strength are achieved, defects of the surfaces of the castings are avoided effectively, and the surfaces of the castings keep bright and smooth; further, the preparation method is simple and easy to operate.

Description

technical field [0001] The invention belongs to the technical field of casting coatings, and in particular relates to a zirconium corundum alcohol-based casting coating and a preparation method thereof. Background technique [0002] Foundry coatings refer to casting auxiliary materials that are coated on the surface of the cavity or sand core to improve their surface refractoriness, chemical stability, resistance to liquid metal erosion, and sand sticking resistance. Alcohol-based coatings for foundry are pastes or powders mixed with various refractory materials, binders, suspending agents and thixotropic agents, and then diluted with organic agents such as ethanol and isopropanol. Density, viscosity, suspension and thixotropic coatings. As the output, quality and export volume of castings in my country increase year by year, the requirements for the amount and quality of casting coatings are also getting higher and higher. Compared with water-based coatings, alcohol-based...

AI Technical Summary

Problems solved by technology

However, the improvement of the surface precision of cast stainless steel castings and ferroalloy parts is not good, cracks and gaps are easy to exist between the coatings, and sand particles on the surface of the molding sand infiltrate and adhere to the surface of the castings, which affects the quality of the castings