A manufacture method of composite electromagnetic wave absorbing material

Abstract

A method for manufacturing a composite electromagnetic wave absorbing material comprise mixing materials, grinding, calcining, kneading and forming, and hydrostatic pressing. The composite electromagnetic wave absorbing material comprises an NdFeB bonded magnet layer and an electromagnetic wave absorbing agent layer. The manufacture method of the electromagnetic wave absorbing agent layer comprises the following steps: mixing and weighing, smelting and casting, mechanical crushing, mixing ball milling and drying; the composite electromagnetic wave absorbing material is obtained by bonding theNdFeB bonded magnet layer and the electromagnetic wave absorbing agent layer. Compared with the raw materials prepared by the aerosol method and the quick extraction method commonly used in the priorart, the preparation process of the mechanical crushing method is simpler and the cost is more saved. The process is simple, the production condition is low, and the raw material cost is relatively low compared with the traditional magnet, which can help to carry out the production and preparation work of the magnet flexibly and efficiently, and help to reduce the production cost of the magnet.

Description

technical field [0001] The invention relates to the field of electromagnetic wave absorbing materials, in particular to a preparation method of a composite electromagnetic wave absorbing material. Background technique [0002] With the development of modern science and technology, the application of electronic and information technology has developed rapidly, and various modern electronic devices such as mobile phones have become popular rapidly, and people are using and relying on more and more information systems. The radiation and leaked electromagnetic waves of electronic equipment threaten human health and safety; information systems are transmitted by means of digital signals, which are easily interfered by electromagnetic waves and cause errors. It has been found that the electromagnetic wave interference generated by the radiated electromagnetic waves of electronic and information equipment can cause obvious medical and communication failures; one of the methods to s...

AI Technical Summary

Problems solved by technology

At the same time, the current method of preparing raw materials is generally to prepare granular raw materials through the aerosol method of pre-smelted materials, or to prepare thin strips through rapid extraction, which is relatively expensive.

[0004] Bonded magnets are an important part of many current magnets. They have better toughness, plasticity and deformation resistance than sintered magnets in use. Most of the production process is to simply attach and bond the magnetic powder to the flexible substrate. Although it meets the requirements of toughness and plasticity, its density is low and the structural strength is insufficient. At the same time, the grain stability inside the magnet is not good, and the hysteresis loss More serious, the magnetic field is susceptible to external interference and aging, and the compressive capacity and magnet density are relatively small. After long-term use, on the one hand, the magnetism of the magnet decreases significantly and rapidly, on the other hand, the magnet itself is also prone to wire wear or weathering. , which seriously affects the service life and performance of the magnet. In view of this problem, it is urgent to develop a new magnet material and preparation method to meet the needs of actual use.