Zinc alloy chilling alcohol group paint by utilizing melt and sublimation of substance to absorb heat

Abstract

The invention relates to a chilling paint, in particular to a cast metal type paint, and specifically relates to a zinc alloy chilling alcohol group paint by utilizing melt and sublimation of a substance to absorb heat. The paint is characterized in that the paint comprises the following components by weight percent: 27-29 percent of graphite powder, 20-22 percent of zinc oxide, 1.5-3 percent tin powder, 1.5-3 percent of sulphur powder, 1.2-1.4 percent of agglomerant, 1.3-1.5 percent of deflocculant, 0.2-0.3 percent of accessory ingredient, and alcohol group solvent in balancing amount. The paint is good in powder heat conductivity, respectively utilizes the melt of the added tin powder and the sublimation of the added sulphur powder to absorb heat, accelerates the speed of the cooling of the surface of an external chill cast, increases the thickness of a chilling layer of the surface of a zinc alloy cast, and improves the surface performance of the cast.

Description

technical field [0001] The invention relates to a chilled coating, in particular to a coating for casting metal molds, in particular to a zinc alloy chilled alcohol-based coating which utilizes material melting and sublimation to absorb heat. Background technique [0002] The thermal conductivity of the chilled coating is large, and when the coating thickness is the same, its thermal resistance is small, which can fully exert the cooling ability of the metal mold on the casting. [0003] For thick-walled castings, during the solidification process of the castings, insufficient feeding occurs due to the slow cooling rate of the castings, resulting in casting defects such as loose structure; a large number of experiments show that: brushing the chilled coating on the mold can effectively improve the quality of thick-walled castings. At the same time, it can refine the matrix structure of the casting to ensure the performance requirements of the casting. [0004] Since the sur...

AI Technical Summary

Problems solved by technology

[0004] Since the surface of metal mold castings and die castings usually needs to be trimmed, if the surface fine-grained region is too thin, the fine-grained region with better mechanical properties will be processed away, resulting in the exposure of the non-fine-grained region, and the small pores in the inner layer ( Defects such as needle voids) and impurities will also be exposed, which will greatly reduce the surface quality of the surface-treated castings

When the thickness of the fine-grained region is not too thick, if part of the fine-grained region structure is to be retained on the machined surface, the design accuracy of the die-casting mold must be improved, which will affect the design efficiency and increase the cost

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