中间相碳微球悬浮体的流变性及凝胶注模成型工艺的研究

Rheological Behavior and Gelcasting of Mesocarbon Microbead Suspensions

以Tween 80为分散剂,制备了水基中间相碳微球(MCMB)悬浮体.Zeta电位测定 结果表明,当Tween 80的用量为1％(以MCMB质量分数计)时,该悬浮体的Zeta,电位绝对 值可达到55mv(pH=7).进一步研究了分散剂用量和固含量对悬浮体流变学性能的影响,发现 悬浮体最佳分散剂用量为1％,随固含量的增加,其粘度也逐渐增加.在此基础上,制得了固含 量达到62.5wt％(53.1vol％)的悬浮体.研究了凝胶注模成型素坯及烧结体的力学性能及显微结 构,并通过该工艺制备了形状复杂的碳板材料.

The aqueous mesocarbon microbead (MCMB) suspensions were prepared by using Tween 80 as dispersant. Zeta potential measurements showed that the Zeta potential of MCMB suspension was 55 mV (pH=7) in absolute when the amount of dispersant was 1wt% (based on MCMB mass). The effects of dispersant amount and solid loading on the rheological behavior of MCMB suspensions were studied. It was found that the optimum content of dispersant was 1%. As the increase of MCMB amount in the suspensions, the viscosity of MCMB suspensions increased. The MCMB suspension with a solid loading of 62.5wt% (53.1vol%) was prepared successfully. The properties and microstructures of MCMB green bodies and sintered bodies were measured and observed, respectively. A carbonaceous plate with complex shape was also fabricated by gelcasting process.