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SiO2f/SiO2 ceramic matrix composites exhibit excellent high−temperature mechanical properties and thermal stability. It proposes an on−line testing technology for mechanical properties and an in−situ micro−observation technology under a controllable water vapor atmosphere based on high−frequency induction heating. A complex near−service water−oxygen corrosion environment for SiO2f/SiO2 composites was simulated, and water−oxygen corrosion tests were conducted on the SiO2f/SiO2 ceramic matrix composites. The fracture surfaces of the composites were characterized and analyzed using scanning electron microscopy (SEM) and micro−computed tomography (micro−CT). The results show that in a high−temperature water vapor environment, the SiO2 matrix of the composite was corroded and reacted with surface groups. Water vapor diffuses through the internal voids of the composite, generating elongated cracks along the fiber distribution, and the quartz fiber matrix was also corroded. After 20 hours of water−oxygen corrosion, the mechanical property retention rate was only 23%. Fracture morphology and failure mode analysis were performed under high−temperature conditions of 600℃ and 1000℃, yielding the fracture behaviors of the material in the high−temperature loading environment. Which provides essential support for the long−term storage, structural performance optimization, and failure mechanism investigation of SiO2f/SiO2 ceramic matrix composites.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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