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High temperature-resistant de-molding paint as well as preparation method thereof

A technology of high temperature resistance and coating, applied in the direction of coating, manufacturing tools, casting molding equipment, etc., can solve the problems of high cost, large amount of graphite powder, high density of ferroalloy liquid/silicon liquid, etc., and achieve low cost, low consumption, uniform thickness effect

Active Publication Date: 2014-02-05
GANSU SANXIN SILICON IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it has many disadvantages: ①The thickness of the graphite powder layer is uneven, and it is difficult to form a protection on the side of the ingot mold; ②The graphite powder layer is too thin to effectively protect the ingot mold, and the amount of graphite powder is too thick. Large, high cost; ③The graphite powder is not bonded to the ingot mold, and the scouring force formed when the high-temperature liquid starts pouring can easily wash away the graphite powder, thereby damaging the ingot mold; ④The density of graphite powder is small, and the density of ferroalloy liquid / silicon liquid Large, part of the graphite powder will float and diffuse into the liquid, and stay in the ingot after cooling, increasing the content of impurity carbon; After the smelting liquid in the ingot mold is cooled, the silicon block / powder will be fused together, which brings more impurities into the smelting liquid, and because a part of the silicon needs to be used as an interlayer, the use efficiency of the ingot mold is reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A high temperature resistant release coating, using SiO 2 100 parts of alkaline silica sol with a content of 30%, 8 parts of 80-100 mesh graphite powder, and 0.5 parts of water glass are prepared after fully stirring and mixing. When in use, use a spray gun to spray it on the surface of the cast steel ingot mold. The coating thickness is about 1mm. After the ingot mold is demoulded, the heat coating can be dried very quickly to form a complete coating. After the paint protective layer is formed, the silicon liquid at a temperature of 1500~1550°C is slowly poured from the silicon bag into the ingot mold sprayed with high-temperature release paint. After the silicon liquid is cooled and solidified, the ingot mold is poured, and the silicon blocks fall off easily and the surface is smooth. After use, the ingot mold coating is basically complete without erosion damage.

Embodiment 2

[0025] A high temperature resistant release coating, using SiO 2 100 parts of alkaline silica sol with a content of 20%, 15 parts of 80-100 mesh graphite powder, and 0.5 parts of water glass. Prepared after thorough stirring and mixing. When in use, use a spray gun to spray it on the surface of the cast steel ingot mold, the coating thickness is about 2mm, and the heat coating can be dried extremely quickly after the ingot mold is demoulded. After the paint protective layer is formed, the silicon liquid at a temperature of 1500~1550°C is slowly poured from the silicon bag into the ingot mold sprayed with high-temperature release paint. After the silicon liquid is cooled and solidified, the ingot mold is poured, and the silicon blocks fall off easily and the surface is smooth. After use, the ingot mold coating is basically complete without erosion damage.

Embodiment 3

[0027] A high temperature resistant release coating, using SiO 2 100 parts of alkaline silica sol with a content of 40%, 8 parts of 80-100 mesh graphite powder, and 0.8 parts of water glass. Prepared after thorough stirring and mixing. When in use, use a spray gun to spray it on the surface of the cast steel ingot mold. The coating thickness is about 1.5mm. After the ingot mold is demoulded, the heat coating can be dried extremely quickly. After the paint protective layer is formed, the silicon liquid at a temperature of 1500~1550°C is slowly poured from the silicon bag into the ingot mold sprayed with high-temperature release paint. After the silicon liquid is cooled and solidified, the ingot mold is poured, and the silicon blocks fall off easily and the surface is smooth. After use, the ingot mold coating is basically complete without erosion damage.

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Abstract

The invention discloses high temperature-resistant de-molding paint which is prepared from alkaline silica sol, graphite powder and a dispersing agent in a proportion of 100:(5-20):(0.1-1), wherein SiO2 content of the alkaline silica sol is 20%-40%; and grain size of the graphite powder is 30 meshes-100 meshes. According to the high temperature-resistant de-molding paint as well as the preparation method disclosed by the invention, conglutination of the paint can be greatly lowered by adding the graphite powder in the alkaline silica sol, a paint protective layer obtained by coating is uniform in thickness, flat and smooth, and bottom and sides are protected; moreover, dosage is a little, and a firm protective film can be formed by only spraying a thin layer of paint; besides, the graphite powder and the silica sol are uniformly fixed, and after forming the protective layer, the graphite powder is dispersed in the silica sol and not dispersed inside a cast ingot to affect product quality.

Description

technical field [0001] The invention relates to a high-temperature-resistant coating, in particular to a coating capable of protecting an ingot mold from being eroded by high-temperature erosion. Background technique [0002] High-temperature coatings generally refer to special functional coatings that can withstand temperatures above 200°C for a long time, and can maintain certain physical and chemical properties, so that the protected objects can function normally in high-temperature environments. As a protective material, coating is widely used in machinery, electronics, aerospace, chemical industry, construction and other fields. [0003] With the expansion of the coating field, some conventional coatings gradually cannot meet the new application requirements, including the temperature resistance of the coating. Most of the coatings we use are organic coatings, and their use temperature is mostly limited to a slightly higher temperature, generally not exceeding 250 °C. ...

Claims

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Application Information

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IPC IPC(8): B22C3/00
Inventor 张旭东曾富强汤才洲
Owner GANSU SANXIN SILICON IND CO LTD
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