A high-temperature-resistant wave-absorbing wedge and its preparation method

Abstract

The invention relates to a high temperature-resistant wave absorbing wedge which is a right square pyramid with a hollow structure and comprises a substrate layer and a high temperature-resistant resistance coating uniformly coated and sintered on the surface of the substrate layer; the substrate layer is made of aluminum oxide or mullite fiber reinforced mullite; the high temperature-resistant resistance coating takes Bi2O3-Al2O3-SiO2 glass as a binding phase and RuO2 as a conductive phase. A preparation method of the high temperature-resistant wave absorbing wedge comprises the following steps: (1) preparing the substrate layer of the right square pyramid with the hollow structure by the aluminum oxide or the mullite fiber reinforced mullite; (2) preparing resistance slurry and printingthe resistance slurry on the surface of the substrate layer prepared in the step (1) by adopting a wire mesh; (3) performing high-temperature sintering on the substrate layer on which the resistance slurry is printed in the step (2) to obtain the high temperature-resistant wave absorbing wedge. The high temperature-resistant wave absorbing wedge provided by the invention has excellent broadband wave-absorbing performance, and the wave absorbing frequency band can cover 2-18 GHz.

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 communications, microwave technology, aerospace and other fields. With the rapid development of electronic and information technology, higher requirements are put forward for the performance of microwave anechoic chambers, and the performance of microwave anechoic chambers depends to a large extent on the absorbing wedge. With the development of high-power microwave devices and the need to test the electromagnetic characteristics of high-temperature absorbing materials, higher requirements are put forward for the temperature resista...

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Problems solved by technology

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

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 It can only reach -7~-12dB in the frequency range of 8~13GHz, and the wave absorption performance is poor

CN104369498A Chinese Patent Document (Application No. 20140631078.3) discloses a wave-absorbing wedge composed of fiber-reinforced resin-based composite material, conductive coating and resin protective coating, which has good wave-absorbing performance but poor temperature resistance

[0004] It can be found from the current situation of absorbing wedges that the absorbing material wedges that can be used at high temperatures and can withstand high-power microwave radiation are still blank.

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