LI Hongwei¹ , YANG Qinghua ¹  ,Ma Hongping ²  ,WANG Huanping ¹  ,WANG Shifeng ¹  ,XU Shiqing ¹

(1. College of Materials Science and Engineering, China Jiliang University, Hangzhou, Zhejiang 310018; 2. School of Mechanical & Automotive Engineering, Zhejiang University of Science and Technology, Hangzhou, Zhejiang 310023)

Abstract: With 30～60 nm, 80～120 nm, 120～150 nm and 150～180 nm submicron AlN powders as additives, the influences of different contents and different sizes of the submicron powders on the sintering behavior and thermal conductivity of micro-AlN ceramics were investigated. The results indicated that a proper addition of submicron powders to the micro-sized AlN powders could promote the sintering process and lower the sintering temperature to 1800℃, and the optimal addition was 1.5 wt% and the optimal size of submicron powders was 120～150 nm. With 1.5 wt% submicron powders in the size of 120～150 nm, the AlN ceramics showed better sintering behavior, and the bulk density and thermal conductivity were 3.12 g·cm-3 and 64.87 W/(m·K), respectively.

Key words:  AlN; ceramics; submicron; modified