吴海华,钟强,刘智,康怡,戢运鑫,郝佳欢,魏恒,杨增辉

• 1:三峡大学机械与动力学院

摘要(Abstract)：

利用选择性激光烧结成形技术制备的石墨件内部疏松多孔、力学性能和导热性能不佳，难以作为功能结构件使用，因此需要对制备工艺进行优化。研究了中间相碳微球(MCMB)的加入量对多孔石墨预制体初始密度、力学性能和导热性能的影响，在比较液态酚醛树脂和中温沥青两种浸渍剂的浸渍效果基础上，对比研究了不同的浸渍工艺组合方案对多孔石墨预制体的性能影响。结果表明：当MCMB加入量为20 mass%时，其挥发性β树脂对孔隙填充效果最好，此时预制体的密度、抗压强度和导热系数达到最高，分别为0.54 g/cm~3、2.57 MPa和2.32 W·m~(-1)·K~(-1);组合浸渍工艺方案中，先浸渍一次液态酚醛树脂，再浸渍两次中温沥青对预制体的性能改善效果最好，密度由0.54 g/cm~3增加至1.46 g/cm~3,抗压强度由2.57 MPa上升到了14.81 MPa。经石墨化处理后，多孔石墨骨架导热系数达到214 W·m~(-1)·K~(-1),相比石墨化前(11 W·m~(-1)·K~(-1))大幅提高。

关键词(KeyWords)： 多孔石墨骨架;选择性激光烧结成形;浸渍致密化;石墨化

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51575313)

作者(Author): 吴海华,钟强,刘智,康怡,戢运鑫,郝佳欢,魏恒,杨增辉

DOI: 10.13289/j.issn.1009-6264.2023-0064

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