Zircon power alternative coating for casting and preparation method thereof

Abstract

The invention discloses a zircon power alternative coating for casting, which is characterized in that a coating composition comprises carrier liquid consisting of isopropyl alcohol, toluene and ethanol, a suspending agent consisting of organobentonite and attapulgite, an adhesive consisting of thermoplastic phenolic resin and rosin, and refractory aggregate consisting of white alundum powder and andalusite powder. The coating composition comprises the following components by weight percent: 6-10 percent of isopropyl alcohol, 2-4 percent of toluene, 6-10 percent of ethanol, 0.5-1.5 percent of organobentonite, 1-2 percent of attapulgite, 0.2-1.0 percent of thermoplastic phenolic resin, 0.2-1.0 percent of rosin, 15-55 percent of white alundum powder and 15-55 percent of andalusite powder. Compared with the conventional common cast steel zircon power coating, the coating has high thixotropy and leveling property, is smooth and dense and has enough normal temperature and high-temperature strength, so that the casting roughness meets the quality requirement; and moreover, the zircon power alternative coating is low in gas outlet quantity and has proper shielding property, and the defects of the casting air holes can be obviously reduced.

Description

technical field [0001] The invention belongs to the technical field of casting coating and its synthesis process, and in particular relates to a zircon powder substitute coating for casting and a preparation method thereof. Background technique [0002] The chemical composition of zircon powder is ZrO 2 >65%, SiO 2 <33%, TiO 2 <0.4%, Fe 2 o 3 <0.5%, P 2 o 5 <0.5%, Al 2 o 3 <0.3%; Particle size: 95% pass 320 mesh, the rest pass 260 mesh. Required refractoriness: not less than 1550°C; total radioactive specific activity not greater than 2*10 -6 Ci·kg -1 ; Commonly used as a mold coating in the investment casting industry. Zircon powder is not only used as the main material in the ceramic industry, but also used for glazing, which increases the wear resistance and surface finish of the made ceramics. Zircon powder has specialized uses in many chemical industries, including cosmetics, cement, food preservation, tanning, fibers (for making flame reta...

AI Technical Summary

Problems solved by technology

[0004] However, in recent years, the source of zircon powder has become more complicated, and the supply and demand relationship in the domestic and foreign markets has undergone significant changes, resulting in a rise in the price of zircon powder.

In addition, domestically processed zircon powder is generally ground by Raymond mills, which has high impurity content and high radioactivity, which is likely to cause physical harm to workshop employees.

Cast steel coatings currently on the market, in addition to zircon powder coatings, also have high-alumina bauxite coatings, chrome ore powder coatings, etc., but these coatings have poor high temperature stability and are difficult to meet the requirements of cast steel.

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