High-temperature oxidation behavior of TiC and TiC + TiB reinforced TB8 matrix composites prepared by spark plasma sintering

TB8 (Ti-13.58Mo-2.15Nb-3.27A1-0.21Si) is a metastable β titanium alloy with excellent mechanical properties. In this paper, TiC/TB8 and TiC + TiB/TB8 titanium matrix composites (TMCs) were prepared by spark plasma sintering (SPS). In addition, the cyclic oxidation interval measurement method was used to compare the high-temperature oxidation behavior of TB8 titanium alloys with different volume fractions of TiC and TiC + TiB reinforced TB8 composites. Studies have shown that after cyclic oxidation at 800 °C for 100 h, the oxidation law of TB8 is a mixture of linear and parabolic, while TMC1 (2.5 vol.% TiC), TMC3 (5 vol.% TiC) and TMC4 (3.5 vol.% TiC + 3.5 vol.% TiB) oxidation mainly follows the parabolic law. Moreover, the oxidation weight gain of TB8 after oxidation is as high as 9.83 mg/cm2, while the oxidation weight gain of TMC1, TMC3 and TMC4 is only 5.95 mg/cm2, 6.81 mg/cm2 and 2.83 mg/cm2. It shows that during the entire oxidation process, the order of excellent high-temperature oxidation resistance is TMC4 > TMC1 > TMC3 > TB8.