ZHI Xiaojie ^1,2 ,PENG Jinhui ^1,2 ,GUO Shenghui ^1,2 ,MENG Bin ^1,2 ,CHEN Guo ^1,2, LI Jun ^1,2 ,WU Xiaofang ¹

(1. Faculty of Materials and Metallurgical Engineering, Kunming University of Science and Technology, Kunming 650093;2. Key Laboratory of Unconventional Metallurgy (Kunming University of Science and Technology), National Ministry of Education, Kunming 650093)

Abstract: Analytical reagent MgO, Al₂O₃ and SiO₂ were used to prepare Mg-Al-Si-O ceramics by the method of direct sintering at 1400℃ and the nano-SiO₂ was added to the raw materials. The effects of nano-SiO₂ contents on the mechanical and dielectric properties of the ceramics were described. The results show that nano-SiO₂ addition at the content of 10wt%~20wt% can effectively reduce the dielectric constant, and the samples show the highest density and bending strength with 30wt% nano-SiO₂.

Keywords: Mg-Al-Si-O ceramic, nano-SiO₂, dielectric constant