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多孔炭在高温下易被氧化,限制了其在高温领域的应用。为了提高多孔炭高温下的抗氧化能力,分别以氧化硼、碳化硼为供硼剂对煤质多孔炭进行固体渗硼。采用X射线衍射、红外光谱、热重、扫描电镜及透射电镜对改性前后多孔炭样品进行了表征。结果表明,分别以碳化硼和氧化硼为渗硼剂的两种固体渗硼方法均能显著提高煤基多孔炭高温下的抗氧化性,氧化失重可由渗硼前的67.7%降低至16.8%。需要指出的是,不同渗硼剂的抗氧化性效果与温度有关。在较低温度下,氧化硼改性多孔炭的抗氧化性略优于碳化硼改性多孔炭,而在600℃以上高温时,碳化硼改性多孔炭的抗氧化性明显优于氧化硼改性多孔炭。
Porous carbon is susceptible to oxidation at high temperatures, limiting its use in high temperature applications. In order to improve the anti-oxidation ability of porous carbon under high temperature, Boron oxide and boron carbide were used as boron-supplying agents to solidify the porous carbon of coal. The samples before and after modification were characterized by X-ray diffraction, FTIR, TG, SEM and TEM. The results show that the two solid borosilicate solutions with boron carbide and boron oxide as boronators can significantly improve the oxidation resistance of coal-based porous carbon at high temperature, and the weight loss can be reduced from 67.7% before boronizing to 16.8%. It should be pointed out that the different anti-oxidation boronizing effect and temperature-related. At lower temperature, the oxidation resistance of boron oxide-modified porous carbon is slightly better than that of boron carbide modified porous carbon, while the oxidation resistance of boron carbide modified porous carbon is obviously better than that of boron oxide at 600 ℃ and above Porous carbon.