A kind of preparation method of bn/carbide coating composite carbon fiber electromagnetic shielding material

Abstract

The invention discloses a composite carbon fiber electromagnetic shielding material with a BN / carbide coating and a preparation method thereof. The electromagnetic shielding material is composed of acarbon fiber matrix and the BN / carbide composite coating on the surface of the carbon fiber matrix, wherein the lower layer of the BN / carbide composite coating is a BN coating, and the upper layer ofthe BN / carbide composite coating is a coating of carbide such as TiC, VC or ZrC. The preparation method comprises the following steps of carrying out high-temperature treatment on a carbon fiber, washing the carbon fiber with acetone, and then taking the carbon fiber as the matrix and sequentially preparing the BN coating and the carbide coating on the surface of the carbon fiber through magnetronsputtering. The prepared electromagnetic shielding material has a good electromagnetic shielding effect in a very wide frequency band range, the electromagnetic parameters of the carbon fiber can beeffectively adjusted, and meanwhile, the composite fiber keeps the excellent performance of the original carbon fiber; the electromagnetic shielding material is provided with comprehensive performanceof high strength, high modulus, corrosion resistance, excellent thermal stability and the like; change of the diameter of the composite carbon fiber is small, the flexibility is good, and the composite carbon fiber can be used for spinning; and the preparation method of the electromagnetic shielding material is simple to operate, low in cost and capable of meeting the requirements of industrial production.

Description

technical field [0001] The invention relates to an electromagnetic shielding material, in particular to a BN / carbide coated composite carbon fiber electromagnetic shielding material and a preparation method thereof, belonging to the field of electromagnetic shielding materials. Background technique [0002] With the rapid development of modern electronic technology, electronic appliances and radio communications are widely used, and the electromagnetic radiation problem is becoming more and more serious. It has become another pollution after noise pollution, air pollution, water pollution and solid waste pollution. Big public nuisance. Electromagnetic waves not only interfere with the normal operation of various electronic devices and affect human health, but also cause information leakage and threaten the country's political, economic and military security. Therefore, exploring efficient electromagnetic shielding materials has become an urgent problem to be solved. [000...

AI Technical Summary

Problems solved by technology

[0008] Aiming at the drawbacks of existing coated carbon fiber materials such as difficulty in meeting the requirements for use at high temperatures, the first purpose of the present invention is to provide a BN / carbide coating that has both excellent mechanical properties and good electromagnetic shielding properties and can be used at high temperatures. The multi-layer composite carbon fiber electromagnetic shielding material solves the problem that the existing carbon fiber used as an electromagnetic shielding material has low electromagnetic parameters and cannot meet the requirements of electromagnetic shielding materials at high temperatures.

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