Effect of milling on properties and consolidation of TiO2 by high-frequency induction heated sintering

• Published in: Electronic materials letters Vol. 9; no. 2; pp. 219 - 225
• Main Authors: Shon, In-Jin, Lee, Geon-Woo, Doh, Jung-Mann, Yoon, Jin-Kook
• Format: Journal Article
• Language: English
• Published: Springer The Korean Institute of Metals and Materials 01.03.2013; 대한금속·재료학회
• Subjects: Ball milling; Characterization and Evaluation of Materials; Chemistry and Materials Science; Condensed Matter Physics; Consolidation; Crystallites; Densification; Density; Materials Science; Nanostructure; Nanotechnology; Nanotechnology and Microengineering; Optical and Electronic Materials; Sintering (powder metallurgy); Titanium dioxide; 전자/정보통신공학; hardness; nanomaterials; fracture toughness; TiO; sintering
• ISSN: 1738-8090; 2093-6788
• DOI: 10.1007/s13391-012-2142-7

Commercial TiO 2 powders were high-energy ball milled for various durations and consolidated using highfrequency induction heated sintering (HFIHS). The effect of milling on the sintering behavior, crystallite size and mechanical properties of TiO 2 powders were evaluated. A nanostructured dense TiO 2 compact with a relative density of up to 98% was readily obtained within 1 min. The ball milling effectively refined the crystallite structure of TiO 2 powders and facilitated the subsequent densification. The sinter-onset temperature was noticeably reduced by the prior milling for 10 h. Accordingly, the relative density of TiO 2 compact increased as the milling time increases. Furthermore, the microhardness and fracture toughness of sintered TiO 2 increased as the density increases. It is clearly demonstrated that a quick densification of nano-structured TiO 2 bulk materials to near theoretical density could be obtained by the combination of HFIHS and the preparatory high-energy ball milling processes.