科研之友
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摘要
C-SiC-B4C-TiB2 composites were hot pressed at 2000°C with graphite flake, SiC, B4C and TiO2 as raw materials. The oxidation behavior of C-SiC-B4C-TiB2) composites in steady atmosphere at 600-1400°C was analyzed in view of isothermal oxidation with oxidation mechanism studied through TG/DTA thermal analysis, and XRD and SEM were used for the phase composition and cross-sectional morphology of oxide layer. The results showed that the oxidation kinetic curves of the composites are in form of parabola. No matter what content of graphite flake is the oxide layer comprises oxide film and transition layer. The composite with 20% graphite flake content has an excellent oxidation resistance with self-reduction properties at 1400°C and forms a compact oxide film which is composed of TiO2 or SiO2·TiO2 solid solution that has not become glass yet and its morphology shows dendritic structure.
- 出版日期2007
- 单位东北大学
