This study investigates the influence of separate and combined addition of 5 vol.% TiC and/or WC on the isothermal oxidation behaviour of ZrB₂–20 vol.% SiC composites consolidated by a spark plasma sintering route. The oxidation performance of the composites was evaluated in the temperature range of 1500–1600 °C in air for up to 4 h. Following oxidation, the samples were subjected to a detailed characterization of the microstructure, micro-composition, phase aggregate, and oxide scale growth kinetics. The thermodynamic feasibility of probable reactions and the phase stability of Zr–B–O, Zr–Si–O, Ti–B–O, Ti–C–O, Ti–W–O, and W–C–O systems were examined by dedicated software. While addition of TiC or WC was found to result in protective oxide scale formation, the highest oxidation resistance in terms of reduced mass gain and oxide layer thickness was offered by ZrB₂–20SiC–2.5TiC–2.5WC (vol.%) composite at 1500–1600 °C in air.

本研究研究了单独和联合添加 5 vol.% TiC 和/或 WC 对通过放电等离子烧结途径固结的ZrB ₂ –20 vol.% SiC复合材料的等温氧化行为的影响。复合材料的氧化性能在空气中1500-1600°C的温度范围内长达4小时进行评估。氧化后，对样品进行微观结构、微观成分、相聚集和氧化皮生长动力学的详细表征。检查了可能反应的热力学可行性以及 Zr-B-O、Zr-Si-O、Ti-B-O、Ti-C-O、Ti-W-O 和 W-C-O 体系的相稳定性通过专用软件。虽然发现添加 TiC 或 WC 会导致形成保护性氧化皮，但 ZrB ₂ –20SiC–2.5TiC–2.5WC (vol.%) 复合材料在降低质量增益和氧化层厚度方面具有最高的抗氧化性。空气中 1500–1600 °C。