Synthesis of TiB2-TiC-Ti3SiC2 Composites by Reactive Hot Pressing of B4C-SiC-Ti Powder Mixtures

Autor: Shigeaki Sugiyama, Hitoshi Taimatsu, Shuhou Koseki
Rok vydání: 2008
Předmět:
Zdroj: MATERIALS TRANSACTIONS. 49:2335-2340
ISSN: 1347-5320
1345-9678
DOI: 10.2320/matertrans.mra2008174
Popis: TiB2-TiC-Ti3SiC2 composites were reaction-sintered from B4C-xSiC-(3 þ 2x)Ti (x ¼ 0 to 1) powder mixtures using reactive hot pressing, and the phase relation of reaction products and sintering behavior were investigated. The reaction B4C þ xSiC þ (3 þ 2x)Ti ! 2TiB2 þ (1 � x)TiC þ xTi3SiC2 proceeded fundamentally during hot pressing. Although the reaction demands no production of TiC phase at x ¼ 1, TiC phase was formed due to the nonstoichiometry of TiC and Ti3SiC2 phases produced. The hot-pressed composites containing the layered compound Ti3SiC2 had no preferential texture. Both TiB2 and TiC were first produced near 960 � C during heating, and then Ti3SiC2 near 1200 � C. The product Ti3SiC2 contributed effectively to the densification of the composites above 1450 � C. [doi:10.2320/matertrans.MRA2008174]
Databáze: OpenAIRE