Chilling alcoholic-group coating absorbing heat by using melting, sublimation and vaporization of substances

Abstract

The invention relates to a coating, particularly relates to a coating for a casting metal mold, and more particularly relates to a chilling alcoholic-group coating absorbing heat by using melting, sublimation and vaporization of substances. The chilling alcoholic-group coating is characterized by comprising the following components in percentage by weight: 27-28% of graphite powder, 21-22% of zinc oxide, 1-2% of tin powder, 1-2% of sulphur powder, 1-2% of hexamethyl benzene, 1.2-1.4% of a binding agent, 1.3-1.5% of a suspending agent, 0.2-0.3% of an addition agent and the balance of an alcoholic-group solvent. The powders in the coating have good thermal conductivity; and few tin powder, sulphur powder and hexamethyl benzene are added, so that through heat absorption due to the melting of the tin powder, the sublimation of the sulphur powder and the vaporization of the hexamethyl benzene, the cooling speed of the surface of a metal mold casting, the thickness of the chilling layer of the surface of a zinc alloy casting and the surface properties of the castings can be increased.

Description

technical field [0001] The invention relates to a paint, in particular to a paint for zinc alloy metal mold casting, in particular to a chilled alcohol-based paint that utilizes material melting, sublimation and vaporization to absorb heat. Background technique [0002] Compared with ordinary sand casting, die castings and metal castings have higher mechanical properties due to their denser structures. However, in the continuous production process, due to the increase of the mold temperature, the cooling rate of the casting will decrease when it solidifies, thus affecting the microstructure and mechanical properties of the casting. A large number of experiments have shown that: brushing the chilled coating on the mold can effectively refine the structure of the casting and improve the quality and mechanical properties of the casting. [0003] Since the surface of metal mold castings and die castings usually needs to be trimmed, if the surface fine-grained region is too thi...

AI Technical Summary

Problems solved by technology

[0003] 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

Images