Novel magnetic aluminum-based composite material and preparation method and application thereof

Abstract

The invention discloses a novel magnetic aluminum-based composite material and a preparation method and application thereof, and belongs to the field of magnetic materials. The novel magnetic aluminum-based composite material adopts light aluminum alloy with good toughness as a matrix, and magnetic particles are dispersed in the matrix in the form of fine composite particles. The method comprisesthe main steps of high-energy ball milling and powder mixing, magnetic field static pressure forming, microwave sintering, homogenizing treatment, rolling annealing and solution treatment. The composite material has the main advantages that the aluminum alloy with light weight and good toughness is used as the matrix, so that the defects of heavy weight, brittleness and the like of the existing magnetic material are overcome; neodymium iron boron magnetic powder is dispersed into an aluminum matrix in a small particle form, so that particles are in a coated state and do not make direct contactwith air during use, and the defects of easiness in oxidation and high service condition can be effectively overcome; The conductivity of aluminum is two orders of magnitudes higher than that of themagnetic material, the heat conductivity coefficient of the aluminum material is 237 W / (m.K) and is about 5 times that of a steel material, and the conductivity and heat conductivity of a new generation magnetic material can be effectively improved by taking aluminum as the matrix.

Description

technical field [0001] The invention relates to magnetic materials, in particular to a novel magnetic aluminum-based composite material, a preparation method and an application thereof. Background technique [0002] Permanent magnet materials have become an important material basis for modern science and technology, such as computer technology, information technology, aerospace technology, communication technology, transportation technology, office automation technology, home appliance technology and health care technology. The world's demand for permanent magnet materials The amount is increasing at a rate of 20% to 30% per year. With the promotion of national energy saving and consumption reduction and green environmental protection policies, the lightweight and miniaturization of devices has become a rigid demand for magnetic material components in many fields. Taking automobiles and other means of transportation as an example, with the development of lightweight automob...

AI Technical Summary

Problems solved by technology

[0004] (2) Poor thermal conductivity

[0005] (3) Easy to oxidize and corrode

[0006] (4) Temperature stability needs to be improved

[0007] (5) The mechanism of high magnetism is still not clarified

The interface characteristics are crucial to the magnetic properties of NdFeB. Studies have shown that the distribution of Nb-containing phases on the surface of NdFeB is the key factor. When other elements are added, its magnetic properties will be improved, but the conclusions and mechanisms are not clear and Systematization is the place where theoretical research needs to be deepened

[0008] (6) The last point is also very critical, the magnetic properties of magnetic materials are not perfect

The advantage of NdFeB magnets lies in its high saturation magnetization, but there are still weaknesses such as low Curie temperature, large reversible temperature coefficient, high remanence temperature coefficient, no anisotropy, and the magnet is not easy to achieve multi-pole magnetization. Still at a disadvantage when competing with iron-cobalt-nickel and rare-earth-cobalt alloys

These deficiencies limit the application fields of NdFeB to a certain extent

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