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High-temperature resistant coating for refining crystal grains of casting and preparation method of high-temperature resistant coating

A technology for high-temperature resistant coatings and castings, which is applied to casting molding equipment, coatings, casting molds, etc. It can solve problems such as coarseness, scrapping, and substandard grain size of batch castings, and achieves difficult qualitative changes, simple operation process, and convenient application Effect

Inactive Publication Date: 2013-05-15
CHONGQING JIANGJIN SHIPBUILDING IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the application, the above-mentioned components are mixed uniformly by mechanical stirring and then used to make the surface layer of the mold shell. Because the components do not add substances that refine the grains of the castings, the grains of the castings produced are relatively coarse. The average grain size of castings is mostly 2.8mm~8.0 mm, and the grain size grade is five to eight. For castings with higher grain size requirements, it is easy to cause batch castings to fail to meet the grain size and be scrapped

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A high-temperature-resistant coating for refining casting grains, which is composed of the following substances: containing SiO 2 24 Kg of ordinary commercially available silica sol with a mass percentage of 30%, 60Kg of fused white corundum powder of 270 mesh to 325 mesh, 3 Kg of cobalt aluminate powder with a particle size of less than 320 mesh after grinding, and ordinary commercially available sodium dodecylsulfonate (wetting agent) 0.261 Kg, n-octanol (defoamer) 0.174Kg; the high temperature resistant coating is specifically prepared according to the following steps:

[0020] Add the silica sol in the container, add the white corundum powder while stirring, add the cobalt aluminate powder after stirring evenly, add wetting agent and defoamer while stirring, and finally use the high-temperature resistant coating Stir evenly with a mixer, and measure the viscosity at 38s with a standard viscosity flow cup to obtain the high temperature resistant coating.

[0021] Th...

Embodiment 2

[0024] A high-temperature-resistant coating for refining casting grains, which is composed of the following substances: containing SiO 2 47.8 Kg of silica sol with a mass percentage of 30%, 120 Kg of fused white corundum powder of 270 mesh to 325 mesh, 6 Kg of cobalt aluminate powder with a particle size of less than 320 mesh after grinding, common commercially available sodium dodecyl xanthate (wetting agent) 0.52 Kg, n-octanol (defoamer) 0.35 Kg; the high temperature resistant coating is specifically prepared according to the following steps:

[0025] Add the silica sol in the container, add the white corundum powder while stirring, add the cobalt aluminate powder after stirring evenly, add wetting agent and defoamer while stirring, and finally use the high-temperature resistant coating Stir evenly with a mixer, and measure the viscosity at 37s with a standard viscosity flow cup to obtain the high temperature resistant coating.

[0026] The cobalt aluminate powder is unifor...

Embodiment

[0029] A high-temperature-resistant coating for refining casting grains, which is composed of the following substances: containing SiO 2 36 Kg of silica sol with a mass percentage of 31.5%, 90Kg of fused white corundum powder of 270 mesh to 325 mesh, 4.5Kg of cobalt aluminate powder with a particle size of less than 320 mesh after grinding, and commercially available cetyltrimethylammonium bromide ( wetting agent) 0.39Kg, n-octanol (defoamer) 0.26Kg; the high temperature resistant coating is specifically prepared according to the following steps:

[0030] Add the silica sol in the container, add the white corundum powder while stirring, add the cobalt aluminate powder after stirring evenly, add wetting agent and defoamer while stirring, and finally use the high-temperature resistant coating Stir evenly with a mixer, and measure the viscosity at 41s with a standard viscosity flow cup to obtain the high temperature resistant coating.

[0031] The cobalt aluminate powder is unif...

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Abstract

The invention relates to a high-temperature resistant coating for refining crystal grains of a casting. The high-temperature resistant coating comprises silica sol and white fused alumina powder as main components. The high-temperature resistant coating is characterized by also comprising cobalt aluminate as the main component, wherein the addition proportion of the cobalt aluminate to the silica sol to the white fused alumina powder is (0.07-0.15):1: (2.4-2.6). The high-temperature resistant coating provided by the invention has the advantages that fine grains of a casting crystal grain refiner are uniformly inlaid in the inner surface of a shell in the shell making process to play a role of catalyzing the formation of a condensation nucleus in the casting pouring, solidification and formation processes, so that the average size of the crystal grains of the casting can be up to 0.4-0.8mm, the grain size can be up to the first-level or third-level, and then, the aim of more conveniently and reliably refining the crystal grains is achieved.

Description

technical field [0001] The invention relates to a surface coating for investment casting production, in particular to a high-temperature-resistant coating for refining casting crystal grains and a preparation method thereof. Background technique [0002] At present, the surface coating commonly used in the investment casting production process is mainly composed of surface silica sol and refractory powder fused corundum powder for bonding, and the addition ratio is 1:2.6~3.0 by mass ratio; And add wetting agent and defoaming agent as auxiliary materials, among them, wetting agent is usually selected from sodium dodecylsulfonate, cetyltrimethylammonium bromide or n-octanol phosphate ammonium salt, etc., and the addition amount is 3 / 1000 of the total weight of the main components; the defoamer is usually n-octanol, ethylene glycol butyl ether phosphate or a composite defoamer with simethicone as the main body, and the added amount is the total weight of the main components tw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C3/00B22C9/04
Inventor 牛兴军陈有金夏洪举
Owner CHONGQING JIANGJIN SHIPBUILDING IND
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