Effect of milling on properties and consolidation of AlN by high-frequency induction heated sintering

• Published in: Electronic materials letters Vol. 10; no. 2; pp. 337 - 343
• Main Authors: Shon, In-Jin, Kwon, Hanjung, Oh, Hyun-Su
• Format: Journal Article
• Language: English
• Published: Springer The Korean Institute of Metals and Materials 01.03.2014; 대한금속·재료학회
• Subjects: Aluminum nitride; Ball milling; Characterization and Evaluation of Materials; Chemistry and Materials Science; Compacts; Condensed Matter Physics; Consolidation; Crystallites; Densification; Density; Materials Science; Nanotechnology; Nanotechnology and Microengineering; Optical and Electronic Materials; Sintering (powder metallurgy); 전자/정보통신공학; hardness; AlN; nanomaterials; fracture toughness; sintering
• ISSN: 1738-8090; 2093-6788
• DOI: 10.1007/s13391-013-3193-0

Commercial AlN powders were high-energy ball milled for various durations, and consolidated without a binder, using the high-frequency induction heated sintering method (HFIHS). The effect of milling on the sintering behavior, crystallite size and mechanical properties of AlN compacts were evaluated. A dense AlN compact with a relative density of up to 96% could be readily obtained within 1 min. The ball milling effectively refined the crystallite structure of AlN powders, and facilitated the subsequent densification. The sinter-onset temperature was reduced appreciably, by the prior milling for 10 h from 750°C to 600°C. Accordingly, the relative density of AlN compact increased, as the milling time increased. It is clearly demonstrated that a quick densification of AlN bulk materials to near the theoretical density could be obtained by the combination of HFIHS and the preparatory high-energy ball milling process.