Efficient lost-wax composite coating

Abstract

An efficient composite paint for the investment casting contains primary component (20-28 Wt%) prepared from two or more of water glass, silicon sol and ethyl silicate, refractory powder (70-76) and secondary component (1-5). Its advantages are high stability, high hardening speed, high wettability and high high-temp strength.

Description

technical field [0001] The invention relates to a coating, in particular to a composite coating made by mixing water glass, silica sol and ethyl silicate as the main raw material and other auxiliary agents; it belongs to the field of metal casting. Background technique [0002] Investment casting, also known as "lost wax casting", is an ancient casting method. The earliest investment casting found in my country was the early Warring States period more than 2,400 years ago, starting from the 1950s; investment casting was used in industrial production, after more than 40 years of development; investment casting has become the basic process in my country's machinery manufacturing industry , and form a unique industry. Investment casting of carbon steel mechanical parts is the main body of investment casting production in my country. The annual output of investment castings is about 150,000 tons, accounting for about 95% of the total output of investment castings. The production...

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Problems solved by technology

[0006] The present invention mainly aims at the high surface roughness, low dimensional accuracy, low high-temperature strength of the molded shell, many layers of the molded shell, poor performance stability of the casting, slow drying, and long shell-making cycle in the castings obtained in the pr

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