CAJ | 학술논문

以中间相沥青和聚酰胺酸为黏结剂和增密剂，用两种不同方法与预压膨胀石墨进行复合。再经过模压炭化，得到高密度、高取向和高导热的炭/石墨复合材料。同时研究了不同沥青含量和不同聚酰胺酸溶液浓度下复合材料的致密性和导热性能。结果表明，随着沥青用量增加，复合材料的密度增加,并在沥青含量占30％时密度达到最大值。热导率在沥青用量为15%时达到最大，为530.64 W/m·K，比铜的热导率高33%。液相浸渍法下，浸渍溶液浓度为12％时，浸渍效果最好，复合材料的热导率和密度达到最大值。相比而言，中间相沥青比聚酰胺酸对膨胀石墨的密度和热导率提升效果更好，这主要是由于在热压条件下，沥青的软化和流动性造成的，流动的沥青能够更好地填充膨胀石墨的孔隙。
이중간상력청화취선알산위점결제화증밀제，용량충불동방법여예압팽창석묵진행복합。재경과모압탄화，득도고밀도、고취향화고도열적탄/석묵복합재료。동시연구료불동력청함량화불동취선알산용액농도하복합재료적치밀성화도열성능。결과표명，수착력청용량증가，복합재료적밀도증가,병재력청함량점30％시밀도체도최대치。열도솔재력청용량위15%시체도최대，위530.64 W/m·K，비동적열도솔고33%。액상침지법하，침지용액농도위12％시，침지효과최호，복합재료적열도솔화밀도체도최대치。상비이언，중간상력청비취선알산대팽창석묵적밀도화열도솔제승효과경호，저주요시유우재열압조건하，력청적연화화류동성조성적，류동적력청능구경호지전충팽창석묵적공극。
Expanded graphite matrix composite was fabricated by mechanical mixing, mold pressing and liquid impregnation meth-ods with mesophase pitch and polyamide acid(PAA) as additives. The density and thermal conductivity of the composites were inves-tigated. The results showed that the sample with pitch content of 15% had the highest thermal conductivity, and the composite achieved maximum density when pitch content was 30%.The maximum thermal conductivity achieved 530.64 W/m·K, which was higher 30% than that of the pure copper, and the maximum density is 1.72 g/cm3.For liquid impregnation method, the sample im-pregnated with 12%PAA solution achieved the maximum value of the thermal conductivity of 331.20 W/m·K and density of 1.64 g/cm3, respectively. The SEM images revealed different compactness and orientation characteristics of the samples from different meth-ods. Composites fabricated with mechanical mixing and mold pressing had higher densification and filler orientation than those from liquid impregnation method, leading to better thermal conductivity and density performances. The main reason may be due to the in-duced fluidic motion of mesophase pitch during the hot-press process, which flushes the gaps between graphite flakes more effectively.