Study on Aluminum Nitride Microwave Attenuation Ceramics with High Thermal Conductivity

To solve the problems of high toxicity and poor consistency of traditional beryllium oxide microwave attenuation ceramics, a kind of AlN-FeSiAl microwave attenuation ceramic based on aluminum nitride with high thermal conductivity was developed. The material belongs to environment-friendly material by adding FeSiAl to the AlN matrix. In order to obtain high thermal conductivity and good electromagnetic performance, the effects of different aluminum nitride powders, FeSiAl additive amount and sintering process on composite properties were studied. The results show that when adopting Toyo aluminum nitride, adding 10 wt% FeSiAl, and vacuum hot pressing sintering under 1650℃ and 85 MPa, the high attenuation performance of microwave attenuation ceramics is realized, and material thermal conductivity is 88.2 W/m•K, close to that of the microwave attenuation ceramics based on aluminum nitride in Ceradyne company. © 2020, Science Press. All right reserved.