Composite investment casting refractory material and its production method

A technology of refractory materials and investment casting, which is applied in the field of composite investment casting shell-making refractory materials and its manufacturing. It can solve problems affecting the quality of castings and the stability of silica sol coatings, and achieve low linear expansion coefficient and stability. The effect of improving and widening the range

Inactive Publication Date: 2006-12-20
ZHEJIANG YUDA CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of refractory material has a certain effect on reducing the cracking of the shell, but because it contains electrolyte ions, when preparing silica sol coatings, these ions will also affect the stability of silica sol coatings and affect the quality of castings.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Get 110 grams of alumina sol with a weight content of 20% and a pH value of 2.0, and add 100 grams of coal gangue powder with a particle size of about 10 microns while stirring (commercially available coal gangue powder product has been calcined), After adding the material, continue to stir until the powder is fully wetted, then heat and evaporate water while stirring, until no liquid phase is observed in the material, discharge the material, put it in a constant temperature box at 500°C, continue to dry to constant weight, and cool to Grinding and pulverizing at room temperature until the sieving rate of passing through a 30-micron sieve is not less than 95%, that is, the finished product is obtained. The finished product takes coal gangue powder as the core, and its outer layer is covered with an alumina coating with an average particle size of about 30 microns.

Embodiment 2

[0021] Take 50 kg of aluminum sol with a weight content of 16% of alumina and a pH value of 2.5, add 100 kg of commercially available coal gangue powder with a particle size of about 30 microns while stirring, and continue stirring until the powder is fully wetted , discharge the material, dry and granulate with a spray dryer, control the outlet powder particle size of the spray dryer to be about 40 microns, and the hot air temperature to be about 600 °C. Collecting the powder at the outlet of the spray dryer is the finished product. The finished product is coal gangue powder as the core, and its outer layer is coated with alumina coating, and its average particle size is about 40 microns.

Embodiment 3

[0023] Take 125 grams of aluminum sol with a weight content of 14% of alumina and a pH value of 3.0, add 100 grams of commercially available coal gangue powder with a particle size of about 45 microns while stirring, and continue stirring until the powder is fully wetted , heating and evaporating water while stirring, until no liquid phase is observed in the material, discharge the material, put it in a constant temperature box at 550°C, continue to dry to constant weight, cool to room temperature, grind and pulverize to pass through a 50-micron sieve Not less than 95%, the finished product is obtained. The finished product uses coal gangue powder as the core, and its outer layer is covered with an alumina coating with an average particle size of about 50 microns.

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Abstract

This invention discloses a composite wax mold casting fireproof material, with 30-300 micron particle diameter, which uses quartz, bauxite, or silicate fireproof material as core, coated by aluminum oxide coating, wherein the said silicate fireproof material is kaolinite fireproof material or grammite. The material is produced by mixing the 10-250 micron diameter quartz, bauxite, or silicate fireproof material granules with aluminium collosol at 0.5-1.5:1, and drying granulating. The said drying granulating is performed by heat drying and then by disintegration or spray drying. When this composite fireproof material is used for coating material, it can efficiently prevent the soluble ions leaching in the original fireproof granules, greatly improve the coating material stability, and fully guarantee the quality of the casting articles, which will make it to be a cheap and superior wax mold casting fireproof material.

Description

technical field [0001] The invention relates to a refractory material and a manufacturing method thereof, in particular to a composite investment casting shell-making refractory material and a manufacturing method thereof. Background technique [0002] Refractory materials are the basic materials for investment casting shells. The main properties of the shells, such as high temperature strength, thermochemical stability, thermal expansion, air permeability, shelling, etc., are all affected by the characteristics of refractory materials, so the quality of the selection is excellent. , stable performance, and rich resources of refractory materials are of great significance to investment casting. [0003] According to the China Foundry Association, pages 200-214 of the "Investment Casting Handbook" published by Machinery Industry Press introduce that there are many types of refractory materials used in investment casting shells, which can be roughly divided into: shell surface ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/14C04B35/16C04B35/657
Inventor 章浩龙
Owner ZHEJIANG YUDA CHEM IND
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