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Outline
In this study，B4C-C green containing carbon fibers are prepared by hot pressure molding process used carbon fiber，boron carbide powder，and graphite powder as raw materials，phenolic resin as molding agent，wherein，carbon fiber and powder are dispersed through shear mixing. Then B4C composites （RBBC） are prepared by reaction sintering of B4C-C green at 1550 ℃. The influence of carbon fiber content on the density，composition，structure，and mechanical properties of composites is studied.The results show that the RBBC has the best synthetic property when the volume fraction of carbon fiber reaches 5% in the green.The bending strength，fracture toughness，elastic modulus，and hardness reach 453 MPa，6.7 MPa·m1/2，349 GPa，and 23.5 GPa，respectively. Carbon fiber partially reacts with silicon as a "slow-release" carbon source during the reaction sintering process，slowing down the reaction rate，avoiding material cracking and deformation during the reaction sintering process. It is also helpful for reducing the size of Si islands and content of residual Si in composites，refining the SiC grains generated by the reaction.
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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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