High thermal conductivity microwave attenuation AlN-based composite material and preparation method thereof

Abstract

The invention discloses a high thermal conductivity microwave attenuation AlN-based composite material and a preparation method thereof, belonging to the field of microwave electronics vacuum technology. According to the high thermal conductivity microwave attenuation AlN-based composite material, (0.1-2.0)vol.% of CNTs (Carbon Nano Tubes) and (1.0-20.0)vol.% of W which are used as metal phases and (100-CNTs-W)vol.% of AlN which is used as a medium phase are used. The preparation method comprises the steps of: mixing the CNTs, the W powder and the AlN powder according to a certain volume ratio to obtain a mixture; and forming and sintering the mixture to obtain a CNTs / W / AlN complex phase microwave absorbing material. The high thermal conductivity microwave attenuation AlN-based composite material has relative density being more than 98 percent, dielectric constant being 17-25 and dielectric loss angle tangent being more than 0.04, has excellent wave absorbing property within a range of 70kHz-1MHz, is especially applicable to preparation of a microwave electric vacuum device, and can be applied to a passive electronic countermeasure and microwave measurement system.

Description

technical field [0001] The present invention relates to a microwave attenuator material and its preparation method, in particular to a green environment-friendly microwave attenuator material and its preparation technology applied under vacuum conditions, specifically a carbon nanotube / tungsten / aluminum nitride (CNTs / W / AlN) composite phase microwave absorbing material and belongs to the field of microwave electron vacuum technology. Background technique [0002] Microwave attenuation materials are widely used in microwave electric vacuum devices. They load high-frequency interaction circuits such as resonant cavities and slow-wave structures to broaden the frequency band, suppress oscillation and eliminate other non-design modes. In addition, microwave attenuating materials are widely used in passive electronic countermeasures. Important facilities on the ground, aircraft in the air, and the construction of confidential microwave isolation rooms all require a large amount o...

AI Technical Summary

Problems solved by technology

[0008] The present invention aims at the defects of existing cermet-based microwave absorbing materials prepared by hot pressing, and aims to provide a microwave attenuation with high density and high loss obtained by rapid sintering of SPS Sintered body, this material can meet the dielectric constant of 17~25, the dielectric loss tangent>0.04, and has good microwave absorption performance in the range of 70kHz~1MHz.