Complex crystal sand powder and preparation method thereof

Through separation and purification of bauxite and combination with multi-metal dopants, high-performance complex crystal sand powder is formed, which solves the problems of poor breathability and high production cost of existing complex crystal sand powder, and achieves the effects of high temperature stability and low linear expansion coefficient.

CN119634663AActive Publication Date: 2025-03-18GUANGDONG KESTER TECH CO LTD
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Patent Information

Application Number
CN202411821865.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-11
Publication Date
2025-03-18
Estimated Expiration
2044-12-11

AI Technical Summary

Technical Problem

The existing complex sand powder has poor breathability and high production costs in precision casting, making it difficult to meet the needs of high temperature stability and low linear expansion coefficient.

Method used

By separating and purifying the bauxite, and mixing it with carrageenan and tetrabutylphosphorus hydroxide, a carbon-silicon-aluminum composite material is formed, and multi-metal dopants such as nanotitanium oxide and nanoferrites and modifiers are combined to improve the sintering performance of the mold shell.

Benefits of technology

It significantly improves the high-temperature thermochemical stability, thermal shock resistance and slag corrosion resistance of complex crystal sand powder, reduces the linear expansion coefficient, and improves the breathability and surface quality of the mold shell.

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Abstract

The invention relates to the technical field of casting shell-making materials, and particularly discloses compound crystal sand powder and a preparation method thereof. The invention relates to a preparation method of compound crystal sand powder, which comprises the following steps: 1) separating and purifying bauxite to obtain refined bauxite; 2) taking carrageenan and tetrabutylphosphorus hydroxide, uniformly mixing, drying, performing first-stage calcination treatment, and grinding to obtain a first calcined material; mixing and grinding aluminum powder, silicon powder and the first calcined material, then carrying out second-stage calcining treatment under vacuum, and grinding to obtain a second calcined material; and (3) uniformly mixing the refined bauxite, the second calcined material and the multi-element metal doping material, then adding a modifier, and grinding, thereby obtaining the product, the multi-element metal doping material is prepared from at least two of nano titanium oxide, nano ferrite, nano zirconium oxide and nano zinc oxide. The prepared composite crystal sand powder has the advantages of being low in linear expansion coefficient, high in true porosity after sintering, high in slag corrosion resistance and high in thermal shock resistance.
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