Materials composed of two or more substances with different properties or different organizational phases, combined in a microscopic or macroscopic form, can be called
For composite materials. Compared with traditional homogeneous materials, the biggest feature of composite materials is that they can be processed according to the performance characteristics of the components.
Reasonable design, giving full play to the advantages of the components, overcoming the shortcomings of a single material, so that the composite material can obtain excellent comprehensive properties that a single component does not have.
Composite performance, that is, composite materials have performance designability. At present, most composite materials are structural composite materials, which are characterized by specific strength
High specific modulus. With the development of science and technology, there is an increasing demand for functional materials and higher performance requirements. The use of composite materials
Research on new functional composite materials based on the principles and methods of materials has become an important direction in the development of functional materials. Bonded NdFeB magnets
It is a kind of magnetic composite material. It is composed of magnetic NdFeB powder and non-magnetic binder.
Research on multi-element composite bonded NdFeB magnets
In recent years, the research on multi-element composite bonded magnets has begun to attract the attention of scholars at home and abroad. Multi-element composite bonded magnets refer to magnets containing
There are more than two different magnetic powders. Since bonded NdFeB magnetic powder has a high performance-price ratio, other magnetic powders are combined with NdFeB magnetic powder.
Composite bonded NdFeB magnets made after mixing have attracted much attention. The composite system includes a combination of fast-quenching NdFeB magnetic powder and ferrite magnetic powder.
The composite of fast quenching NdFeB magnetic powder and samarium cobalt powder, the composite of isotropic and anisotropic NdFeB powder. Composite bonded NdFeB may be used in
There is hope for breakthroughs in the following aspects:
2.Low price. Since the price of Rapidly-quenched neodymium iron boron permanent magnetic powder , especially MQ magnetic powder, is relatively expensive, it has a great impact on the bonding of NdFeB.
Boron is widely used, using the combination of ferrite magnetic powder and quick quenching powder, or the combination of low-priced magnetic powder and Rapidly-quenched neodymium iron boron permanent magnetic powder to obtain low-cost
Cost bonded NdFeB magnets.
2.Low temperature coefficient. Utilize the temperature compensation effect of different magnetic powders in composite bonded magnets and the combination of anisotropic magnetic powder and isotropic magnets.
The temperature compensation effect of powder can effectively reduce the temperature coefficient. For example, Yoshihiko Matsuyama combines anisotropic ferrite with
The temperature coefficient of the bonded magnet prepared by mixing NdFeB powder and isotropic NdFeB magnetic powder can be reduced to 0.098%/℃, showing a certain Prospects.
3.Magnetic performance design. In the preparation of bonded NdFeB magnets, ferrite and other magnetic powders are added and can be prepared through composition design.
It can produce bonded magnets with continuously adjustable magnetic energy product in the range of 2~12MGOe, especially those with magnetic energy product in the range of 4~8MGOe.
The magnetic performance of the magnet is between that of sintered ferrite and bonded NdFeB, and its price is lower than that of single bonded NdFeB. It can meet certain requirements Design requirements for some occasions。
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