GUO Linlin (1979-), female, Ph.D., Associate Professor. E-mail: guoll@tju.edu.cn
To improve the low-temperature oxidation resistance of MoSi2, a core-shell structured MoSi2@SiO2 was prepared by a direct preoxidation method, and the preoxidation conditions, as well as the structure and the low-temperature oxidation resistance of MoSi2@SiO2 composite, were investigated. Results show that the core-shell structured MoSi2@SiO2 can be obtained under preoxidation at 800 ℃ for 1 h. The obtained SiO2 shell is amorphous which is formed due to the non-selective oxidation of MoSi2 and the evaporation of the oxidation product MoO3. The oxidation mass gain rate of MoSi2@SiO2 is <1.6% after isothermal cyclic oxidation at 400-700 ℃ for 12 h.
| 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 |