Dielectric properties of AlN/Mo composite ceramics prepared by spark plasma sintering method at different processing conditions

In this study, the effects of powder mixed method, sintering temperature, and the additive amount of the conductive phase on the dielectric loss tangent and permittivity constant of AlN/Mo composite ceramics were investigated. All the ceramic samples were prepared by spark plasma sintering (SPS). AlN composite ceramics with additional 10 vol% Mo sintered at 1400 degrees C holding for 5 min exhibit the best dielectric loss tangent, which is greater than 0.23. AlN/Mo ceramics with additional 20 vol% Mo become conductive, with the resistivity of 0.05-0.06 omega center dot m. High-energy ball milling is better than magnetic stirring powder mixing method. In addition, the additive Mo and lower sintering temperature lead to a better property with the increase in the electromagnetic wave frequency range of 1 x 10(3)-1 x 10(6) Hz.

Automated summary

This study investigated the effects of powder mixed method, sintering temperature, and the additive amount of the conductive phase on the dielectric loss tangent and permittivity constant of AlN/Mo composite ceramics. The results showed that AlN composite ceramics with an additional 10 vol% Mo sintered at 1400 degrees C for 5 minutes exhibited the best dielectric loss tangent of over 0.23. AlN/Mo ceramics with an additional 20 vol% Mo became conductive with a resistivity of 0.05-0.06 omega center dot m. High-energy ball milling was found to be more effective than magnetic stirring powder mixing method. Additionally, the additive Mo and lower sintering temperature improved the properties in the electromagnetic wave frequency range of 1 x 10^3-1 x 10^6 Hz.