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

• Published in: Rare metals Vol. 41; no. 4; pp. 1369 - 1374
• Main Authors: Gao, Peng, Jia, Cheng-Chang, Cao, Wen-Bin, Wang, Cong-Cong, Xu, Guo-Liang, Liang, Dong, Cui, Zhao-Wen
• Format: Journal Article
• Language: English
• Published: Beijing Nonferrous Metals Society of China 01.04.2022; Springer Nature B.V
• Subjects: Ball milling; Biomaterials; Ceramics; Chemistry and Materials Science; Dielectric loss; Dielectric properties; Electromagnetic radiation; Energy; Frequency ranges; Materials Engineering; Materials Science; Metallic Materials; Nanoscale Science and Technology; Physical Chemistry; Plasma sintering; Sintering (powder metallurgy); Spark plasma sintering; Dielectric loss; Spark plasma sintering; Molybdenum; Aluminum nitride
• ISSN: 1001-0521; 1867-7185
• DOI: 10.1007/s12598-015-0486-5

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 °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 Ω·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 × 10 3 –1 × 10 6  Hz.