Oxidation of Titanium Matrix Composites Reinforced with (TiB + TiC) Particulates

• DOI: 10.1007/s12540-018-00212-z
• Publication Date: 2019-01-01T00:58:32Z
• Authors: Young-Jig Kim; Poonam Yadav; Junhee Hahn; Xiao Xiao; Dong Bok Lee
• Keywords: 0205 materials engineering; 02 engineering and technology

Titanium matrix composites reinforced with (5, 10, 20) vol% (TiB + TiC) particulates were in situ synthesized using melting-investment casting method by reacting Ti with B4C powder. Their oxidation behavior was studied at 800–1000 °C in air. Formed scales consisted of transient TiO3 and stable rutile-TiO2. More dispersed (TiB + TiC) particulates had higher oxidation resistance due to strong Ti–B and Ti–C bonding which required higher activation energy for oxidation compared to Ti–Ti bonding in the matrix. However, such increment in oxidation resistance was limited by the formation of semi-protective titanium oxides, volatile B2O3, and CO2 gas. With increment of (TiB + TiC), scales progressively became thinner, thus improving scale adherence.