以丙烯为碳源,利用磁悬浮天平热重系统研究了化学气相沉积热解碳的原位动力学,采用气质联用仪对热解气相冷凝物进行了定性和半定量分析.结果表明:当稀释比为4,总压力为6kPa,丙烯流量为20sccm时,丙烯在850~1100℃之间的热解反应表观活化能为(201.9±0.6)kJ/mol,沉积过程为气相均相反应控制,高温时冷凝物以单环芳烃为主,低温时主要为双环和多环芳烃;在900和1000℃下,丙烯分压在0.3~6.5kPa范围内的热解为一级反应;由于受有效反应时间和丙烯通量的共同作用,沉积速率随滞留时间的延长先增大后减小,在900℃下滞留时间为0.6s时出现最大值.
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