A kind of high temperature resistant wedge-shaped wave absorbing material and preparation method thereof

Abstract

The invention relates to a high-temperature-resistant wedge-shaped microwave absorbing material. The high-temperature-resistant wedge-shaped microwave absorption material adopts a conductive glass material system which contains a glass phase and a conductive phase, the glass phase is used as the matrix, pyrolysis carbon black is used as the conductive phase of the system, and the conductive phase is uniformly distributed in the glass phase. The method for preparing the high-temperature-resistant wedge-shaped wave absorbing material comprises the steps of mixing raw materials, granulating, pressing, sintering, processing one face after another and coating an antioxidation coating, wherein an organic compound is added in the step of mixing raw materials and participates in the subsequent steps of granulating, pressing and sintering, and is used as different functional additives; the organic compound is used as a particle forming agent in the step of granulating; in the step of pressing, the organic compound is used as an adhesive for glass powder which is used for pressing forming of green bodies; and in the step of sintering, the organic compound is used as a precursor of the conductive phase in the target product conductive glass material system. The high-temperature-resistant wedge-shaped microwave absorbing material disclosed by the invention can satisfy the requirements of testing high temperature electromagnetic performance and high power density of materials and devices under the condition of microwave radiation.

Description

technical field [0001] The invention mainly relates to a wave-absorbing material and a preparation process thereof, in particular to a wave-absorbing wedge and a preparation method thereof. Background technique [0002] With the development of communication technology, stealth technology, simulation test technology and various electronic equipment, microwave anechoic chambers and absorbing materials have been developed rapidly, and are widely used in communication, microwave technology, aerospace and other fields. With the rapid development of electronics and informatization, higher requirements are put forward for the performance of the microwave anechoic chamber, and the performance of the microwave anechoic chamber depends to a large extent on the wave-absorbing wedge. [0003] At present, the commonly used microwave-absorbing wedges mainly use carburized polyurethane foam materials, which have the following problems when used in microwave anechoic chambers: 1) Since the ...

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Problems solved by technology

[0003] At present, the commonly used microwave-absorbing wedges mainly use carburized polyurethane foam materials, which have the following problems when used in microwave anechoic chambers: 1) Since the base material is a foam material, it is prone to moisture absorption, which affects the performance of the wedges; 2 ) In the long-term use process, especially the wedges that often need to be moved, the problem of carbon powder falling is prone to occur, resulting in a decrease in the performance of the wedge; 3) The mechanical properties of the foam material are poor, and it is prone to damage, resulting in a shorter life of the wedge ; 4) The flame retardant performance is poor, and it is prone to fire; 5) Due to the use of organic materials, the temperature resistance of the wedge is limited, and it is difficult to apply under high-power microwave irradiation and high temperature conditions

No. CN1286474A Chinese patent literature (application number 00109462.9) has announced a kind of foam glass wave-absorbing material, adds mineral material, chemical material and electromagnetic absorber in foam glass, or coats absorber on its bottom surface, makes it have to radar wave For microwave absorption, the temperature resistance of the glass substrate used has been significantly improved compared with organic substrates such as polyurethane, but the microwave absorption performance of the published patent in the 2-18GHz frequency range can only reach -8-25dB, and the microwave absorption performance is relatively low. Difference

CN101985551A Chinese Patent Document (Application No. 201010259819.1) discloses a wave-absorbing material in which zinc powder and manganese dioxide are added to borosilicate foam glass and its preparation method. Its temperature resistance is good, but its wave-absorbing performance is In the 8-13GHz frequency range, only -7-12dB absorption can be achieved, and the absorption performance is poor

[0008] From the current status of microwave-absorbing wedges, it can be found that the problem of microwave-absorbing wedges applied at room temperature and with low radiation power has been better solved, but the microwave-absorbing wedges that can be used at high temperatures and can withstand high-power microwave radiation The wave-absorbing wedge is still blank

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