Preparation method of uniform composite powder of dual-scale silicon carbide and aluminum powder

Through ethanol ultrasonic dispersion of nano SiCp and combined with high-energy vacuum ball milling technology, the problem of uniform dispersion of double-scale silicon carbide and aluminum powder composites in powder metallurgy is solved, and the low-cost preparation of high-density and high-performance SiCp/Al matrix composites is achieved.

CN115921876BActive Publication Date: 2025-03-28CSIC NO 12 RES INST
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Patent Information

Application Number
CN202211611606.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-12-13
Publication Date
2025-03-28
Estimated Expiration
2042-12-13

AI Technical Summary

Technical Problem

When the existing powder metallurgy method prepares double-scale silicon carbide and aluminum powder composite materials, it is difficult to achieve uniform dispersion of nano SiCp, micro SiCp and aluminum powder, resulting in agglomeration and stratification, affecting the yield and physical properties of the material.

Method used

The nano-SiCp is dispersed with ethanol ultrasonic and combined with high-energy vacuum ball milling technology to form mechanical bonds to aluminum powder. The surface pretreatment and secondary ball milling are used to ensure uniform dispersion of micro-SiCp and aluminum powder, and avoid the use of binders.

Benefits of technology

The uniform composite powder preparation of double-scale silicon carbide and aluminum powder is achieved, which improves the density and physical properties of the material, reduces the sintering and degassing time, is simple in process, environmentally friendly, and reduces the preparation cost.

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Abstract

The present invention discloses a method for preparing a uniform composite powder of dual-scale silicon carbide and aluminum powder, a powder mixing method for uniformly dispersing dual-scale silicon carbide of nano-SiCp and micron-SiCp with a total volume content of no more than 50% in aluminum powder, utilizing the adsorption effect of nano-SiCp to make it into a slurry with aluminum powder and then ball milling and mixing it, utilizing the hardness difference and activity of the two to form a mechanical bond between the nano-SiCp and the aluminum powder during the high-energy ball milling process of the aluminum powder, and then adding pre-mixed micron-SiCp or a mixed powder of micron-SiCp and aluminum powder for mechanical mixing to achieve uniform mixing of dual-scale SiCp and aluminum powder. The present invention discloses a method for preparing a composite powder, which does not add a binder and can uniformly mix dual-scale SiCp and aluminum powder, and will not cause secondary agglomeration or stratification in the subsequent use of the composite powder. The composite powder preparation method is simple, effective, safe and environmentally friendly.
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