Sintering and characterization of Al2O3-TiB2 composites

✍ Scribed by Isao Kimura; Noriyasu Hotta; Yukio Hiraoka; Natsukaze Saito; Yuji Yokota

• Publisher: Elsevier Science
• Year: 1989
• Tongue: English
• Weight: 476 KB
• Volume: 5
• Category: Article
• ISSN: 0955-2219
• DOI: 10.1016/0955-2219(89)90005-8

✦ Synopsis

A bstra ct

AI203-TiB 2 composites containing 0-50 wt% TiB 2 were prepared by sintering at 1600-1750°C ,for 15-120min in a vacuum. Relative density increased with TiB 2 addition from 97% (no TiB2) to about 99% ( lO-40wt% TiB2) on sintering at 1750°C Jbr 60 min. TiB 2 behaved as a sintering aid to promote densification by inhibiting rapid grain growth of A l 2 03. Bending strength and microhardness increased with increasing relative density. In particular, microhardness was so improved as to exceed that of Al20 3 and reach 30"IGPa. Resistivity decreased with increasing TiB 2 content and dropped down to 3 × 10 2 f~ m with 30 wt% TiB 2.