Method for preparing aluminum alloy cast coating

Abstract

The invention belongs to the field of functional coatings, and in particular relates to a method for preparing an aluminum alloy cast coating. The method specifically comprises the following steps: 1) dispersing attapulgite and silicon oil into an ethanol solvent in a mass ratio of 1:3, backflowing and stirring for 2-4 hours at the water bath temperature of 40-60 DEG C, steaming to dry at the water bath temperature of 90 DEG C, and finally transferring the mixture to a muffle furnace for calcinations, thereby preparing a silanization attapulgite powder material; 2) putting the silanization attapulgite powder material prepared in the step 1), silicon powder, ethylene-vinyl acetate, abietate, carboxymethyl cellulose and ethanol into a wet type ball-milling machine for ball-milling for 2-4 hours, thereby preparing the aluminum alloy cast coating. The method has the advantages that firstly, the coating is relatively good in viscosity, good in high-temperature anti-cracking property and good in high-temperature strength, and secondly, due to the adoption of the nano boron nitride powder, the heat conductivity of the coating is improved, the curing speed of a cast piece is increased, and thus the tendency of pores and micro cracks of an aluminum alloy cast piece is reduced.

Description

technical field [0001] The invention belongs to the field of functional coatings, and in particular relates to a preparation method of aluminum alloy casting coatings. Background technique [0002] As a structural material, compared with steel, aluminum alloy has the advantages of low density and high specific strength, and its usage in aviation, aerospace, automobile, medical equipment and other fields is increasing day by day. In the production process of aluminum alloy castings, especially in the manufacturing process of aluminum alloy castings with holes, a large number of hole defects will be generated near the hole structure, resulting in a significant decline in the performance of aluminum alloy castings, especially the mechanical properties and sealing properties, resulting in the failure of the finished product. The efficiency is low, and a lot of energy is wasted, which brings losses to production. The study of void defects in aluminum alloys has long been a hot s...

AI Technical Summary

Problems solved by technology

In the production process of aluminum alloy castings, especially in the manufacturing process of aluminum alloy castings with holes, a large number of hole defects will be generated near the hole structure, resulting in a significant decline in the performance of aluminum alloy castings, especially the mechanical properties and sealing properties, resulting in the failure of the finished product. The efficiency is low, a lot of energy is wasted, which brings losses to production

The study of void defects in aluminum alloys has long been a hot spot in the research of casting aluminum alloys, but there has been no effective process to control or eliminate such void defects