高强度中间相沥青基泡沫碳的制备及性能

Preparation and Characterization of High Strength Carbon Foam Derived From Mesophase Pitch

以中间相沥青为原料,通过加入中间相碳微球和溶剂抽提两种方法对中间相沥青进行改性,实现了对中间相沥青基泡沫碳的微观结构的调控,对两种方法进行了对比讨论。结果表明,改性后沥青制备的泡沫碳的裂纹数量较少,长度较短,并且泡沫碳的孔径较小;加入55%中间相碳微球的沥青制备的泡沫碳的炭化(1573K)后的压缩强度高达26.2MPa,在2873K石墨化后强度达到17.7MPa,热导率为41.4W/(m.K)。利用甲苯抽提后的沥青得到的泡沫碳在炭化(1573K)后强度高达30.0MPa,在2873K石墨化后强度达到9MPa,热导率达到80W/(m.K)。

In the present work,the modified mesophase pitches were used as precursors to prepare carbon foam. The modification of mesophase pitch could tailor the microstructure of as-prepared carbon foam. Amount of cracks in as-prepared carbon foam was less than that of carbon foam derived from pure mesophase pitch, and the length of cracks in as-prepared carbon foam was shorter. Moreover, the pore diameter of as-prepared foam was smaller. Carbon foam with compressive strength of 26.2 MPa was obtained by adding 55% MCMBs into mesophase pitch. After graphitization at 2 873 K,carbon foam with compressive strength of 17.7 MPa and thermal conductivity of 43.7 W/（m·K） was obtained. Carbon foams derived from mesophase pitch treated by toluene extraction after carbonization at 1 573 K had a high compressive strength of 30.0 MPa. After graphitization at 2 873 K,the foams had a compressive strength of 9 MPa and a thermal conductivity of 80 W/（m· K）.