高强度中间相沥青基泡沫碳的制备及性能

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(1573 K)后的压缩强度高达26.2 MPa,在2 873 K石墨化后强度达到17.7 MPa,热导率为41.4 W/(m·K).利用甲苯抽提后的沥青得到的泡沫碳在炭化(1 573 K)后强度高达30.0 MPa,在2 873 K石墨化后强度达到9 MPa,热导率达到80 W/(m·K).

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

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 2873K,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).