High-temperature oxidation behaviour of Ti3Si(1�?����?)Al𝑥C2 in air

[摘要] The oxidation behaviours of bulk Ti₃Si_{(1â€�?�ð�?��?)}Al_ð‘�?C₂ prepared by hot pressing were investigated. The results showed that the isothermal oxidation behaviour of Ti₃SiC₂ obeyed a parabolic law between 900 and 1100°C, and followed a two-step parabolic rate law between 1200°C and 1300°C. The cyclic oxidation behaviour of material is assumed to obey a three-step parabolic rate law at 1100°C and 1200°C. The calculated activation energy of isothermal oxidation is 101.43 kJ.mol^-1. The oxide layers consisted of a mass of ð›�?-Al₂O₃ and little TiO₂ and SiO₂ are observed on Ti₃SiC₂ as a dense and adhesive protect scale. The oxidation mechanism varies with the additive aluminum that greatly improves the oxidation resistance of Ti₃SiC₂.

[学科分类] 材料工程

[关键词] Ti3SiC2;isothermal oxidation;cyclic oxidation;oxidation kinetics.