Magnetic aluminum matrix composite and preparation method thereof

Abstract

The invention provides a magnetic aluminum matrix composite and a preparation method thereof. Neodymium iron boron (Nd2Fe14B) powder is added into a pure aluminum substrate, and after the neodymium iron boron powder and the pure aluminum substrate are mixed evenly, the magnetic aluminum matrix composite high in magnetism is prepared by adopting a powder metallurgic method combined with isostatic cool pressing combined with a microwave sintering technology. The magnetic aluminum matrix composite prepared by the preparation method provided by the invention has the advantages that the material utilization rate is high, and the cost is low; by selecting the microwave sintering technology and utilizing the advantages of rapidness and overall sintering of the microwave sintering technology, a microstructure of the material is controlled, and a structure guarantee is provided for a new material to have high magnetic performance.

Description

technical field [0001] The invention relates to a magnetic aluminum-based composite material and a preparation method thereof, belonging to the technical fields of composite materials and powder metallurgy. Background technique [0002] At present, the development of magnetic materials in my country is rapidly expanding, and with the development of computers, communications and other industries, the rare earth permanent magnet industry, especially the Nd-Fe-B permanent magnet industry, has developed rapidly and is one of the important basic materials supporting the modern electronic information industry. , is closely related to people's lives; at the same time, emerging fields such as wind power generation, new energy vehicles, frequency conversion appliances, energy-saving elevators and other emerging fields have an increasing demand for high-performance rare earth permanent magnet materials, with huge development space; digital development of information technology and elect...

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Problems solved by technology

[0003] NdFeB (Nd 2 Fe 14 B) It is the fastest growing and most promising permanent magnet material. It has the characteristics of small size and strong magnetism. It is known as the "Magnetic King" in the field of magnetism. However, NdFeB materials have the following performance deficiencies, as follows: first , high density, heavy weight, does not meet the requirements of lightweight; second, the brittleness is very obvious, the tensile strength is small, and even a very small crack will cause its failure, the safety is poor, and there are certain hidden dangers in the use of high-speed motors; high brittleness At the same time, it leads to extremely poor processing performance; third, the resistance is large, the resistivity at room temperature is dozens of times higher than that of the electromagnetic wire, and the conductivity is poor, and the conductivity is slightly insufficient when used as an electroacoustic conversion and electromechanical transmission device; fourth, poor thermal conductivity On the whole, although NdFeB has high magnetic properties, its lack of performance also limits its use and development, and it is difficult to meet the performance requirements of high-performance magnetic materials under the new situation.

[0004] Aluminum is rich in reserves in the earth's crust, and has the characteristics of small specific gravity, good thermal and electrical conductivity, excellent corrosion resistance, and good processability. However, aluminum is not magnetic, so its application in the electronic and magnetic fields is limited. Now aluminum It is completely used in non-magnetic fields, such as aerospace, mechanical equipment, etc.; aluminum-based composite materials combine the advantages of aluminum matrix and composite phase, and have comprehensive and excellent performance such as high strength, high modulus, high wear resistance, and low expansion , has attracted much attention in the research of new materials. At present, domestic research on aluminum matrix composites has achieved a series of huge results, but there are few research reports on magnetic aluminum alloys and their composite materials.

[0005] The research laboratory of the Faculty of Production Engineering of Nihon University first tried to prepare magnetic aluminum materials by adding ferrite composite material powder to the aluminum melt and stirring it. However, due to the high temperature of the melt, magnetic materials such as aluminum and iron powder are prone to reactions, and Intermetallic compounds are formed on the interface, resulting in magnetic loss, and only low magnetic materials can be prepared

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