کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1528050 | 1511858 | 2007 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Improvement in air oxidation resistance of carbon materials by W2B5 ceramic reinforcement Improvement in air oxidation resistance of carbon materials by W2B5 ceramic reinforcement](/preview/png/1528050.png)
C–W2B5 composites with a W2B5 content ranging from 30 to 60 vol.% at an interval of 10 vol.% were prepared by reaction hot-pressing sintering. Isothermal oxidation behavior of these materials at the temperature range from 700 to 1000 °C in air for 20 h was investigated. The results revealed that all the materials had better oxidation resistance than pure graphite. The oxidation activated energies of the composites increased from 108 to 262 kJ mol−1 with W2B5 content increasing, which was attributed to the formation of a dense and continuous oxide layer of WO3 and B2O3 on the oxidation surface. The composition and morphologies of the oxidation surface and cross-section of the oxide layer were observed by XRD and SEM together with EDX. A general oxidation mechanism of the C–W2B5 composite was proposed.
Journal: Materials Chemistry and Physics - Volume 102, Issues 2–3, 15 April 2007, Pages 111–117