(中南大學(xué) 粉末冶金國家重點(diǎn)實驗室，長沙 410083)
摘 要: 以AR中間相瀝青為原料，在4、5、7、10 MPa下用恒壓自發(fā)泡工藝制備泡沫炭生料，經(jīng)炭化、石墨化處理后分別獲得炭化泡沫炭和石墨化泡沫炭。采用SEM和OM觀察泡沫炭的微觀形貌，采用XRD分析泡沫炭的晶體結(jié)構(gòu)，并測定泡沫炭的壓縮強(qiáng)度和熱導(dǎo)率。結(jié)果表明：隨著發(fā)泡壓力的升高，孔泡變得均勻，韌帶片層結(jié)構(gòu)變得規(guī)則有序，但發(fā)泡壓力增大到一定程度后，閉孔增多，韌帶有序結(jié)構(gòu)變差；當(dāng)發(fā)泡壓力為10 MPa時，炭化和石墨化試樣的壓縮強(qiáng)度達(dá)到最大值，分別為8.16 MPa和3.42 MPa；當(dāng)發(fā)泡壓力為7 MPa時，石墨化試樣的熱導(dǎo)率達(dá)到最大值，61.0 W/(m∙K)。
關(guān)鍵字: AR中間相瀝青；泡沫炭；壓縮強(qiáng)度；熱導(dǎo)率
properties of mesophase-pitch-derived carbon foams
（State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:The nascent foams were prepared from AR mesophase pitch by self-foaming technology at constant pressure under foaming pressures of 4, 5, 7 and 10 MPa. Carbonized and graphitized carbon foams were formed by carbonization and graphitization. The microstructures and crystal parameters of carbon foams were characterized by SEM, OM and XRD. The compressive strength and thermal conductivity were also measured. The results show that the bubble holes distribute uniformly and the structures of the ligaments become more ordered with increasing the foaming pressure. But the number of obturated pores increases and the ligaments become more disorderly when the pressure reaches a certain degree. The maximum compressive strengths of carbonized and graphitized carbon foams are obtained at foaming pressure of 10 MPa, which are 8.19 MPa and 3.42 MPa, respectively. The thermal conductivity of graphitized carbon foam reaches the maximum value of 61.0 W/(m·K) at foaming pressure of 7 MPa.
Key words: AR mesophase pitch; carbon foam; compressive strength; thermal conductivity
