A novel magnetic aluminum-based composite material, its preparation method and its use

Abstract

The invention discloses a novel magnetic aluminum-based composite material, a preparation method and an application thereof, belonging to the field of magnetic materials. The new magnetic aluminum-based composite material uses light, strong and tough aluminum alloy as the matrix, and disperses the magnetic particles in the matrix in the form of fine composite particles. The main steps include: high-energy ball milling powder mixing, magnetic field static pressure forming, microwave sintering, homogenization treatment, rolling annealing, and solution treatment; the main advantages are: using light, strong and tough aluminum alloy as the matrix, overcoming the existing There are disadvantages such as heavy and brittle magnetic materials; the NdFeB magnetic powder is dispersed into the aluminum matrix in the form of small particles, the particles are in a coated state, and do not directly contact the air during use, which can effectively improve the "easy to oxidize and high service conditions". The disadvantages of "; the electrical conductivity of aluminum is two orders of magnitude higher than that of magnetic materials, and the thermal conductivity of aluminum is 237W / (m K), which is about 5 times that of steel materials. Using aluminum as the matrix can effectively improve the new generation of magnetic materials. electrical and thermal conductivity.

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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