CAJ | 학술논문

以中间相沥青和添加中间相炭微球的沥青为原料,调整发泡压力和发泡湿度制备沥青泡沫,经1273K炭化和2973 K石墨化,制备了高密度石墨泡沫.为了进一步提高石墨泡沫的密度,采用573 K的沥青反复浸渍炭化未添加中间相炭微球的沥青在1273K下所制的泡沫炭,再经2973K石墨化获得增密度后的石墨泡沫.而后制备了相应石墨泡沫/石蜡复合材料.研究了石墨泡沫热物理性能的影响因素和石墨泡沫/石蜡复合材料的热行为.研究表明:沥青组分、发泡温度和发泡压力决定了石墨泡沫的结构和热物理性能,而石墨泡沫的热导率决定了复合材料的热行为.与石蜡相比,石墨泡沫/石蜡复合材料的热扩散系数提高了768至1588倍.石墨泡沫/石蜡复合材料的潜热与石蜡的质量分数成正比.该复合材料是快速响应电子散热材料的良好选择.
이중간상력청화첨가중간상탄미구적력청위원료,조정발포압력화발포습도제비력청포말,경1273K탄화화2973 K석묵화,제비료고밀도석묵포말.위료진일보제고석묵포말적밀도,채용573 K적력청반복침지탄화미첨가중간상탄미구적력청재1273K하소제적포말탄,재경2973K석묵화획득증밀도후적석묵포말.이후제비료상응석묵포말/석사복합재료.연구료석묵포말열물이성능적영향인소화석묵포말/석사복합재료적열행위.연구표명:력청조분、발포온도화발포압력결정료석묵포말적결구화열물이성능,이석묵포말적열도솔결정료복합재료적열행위.여석사상비,석묵포말/석사복합재료적열확산계수제고료768지1588배.석묵포말/석사복합재료적잠열여석사적질량분수성정비.해복합재료시쾌속향응전자산열재료적량호선택.
High-density graphite foams (GFs) were prepared from mesophase pitch with or without mesocarbon microbeads at different foaming temperatures and pressures,followed by carbonization and graphitization at 1273 and 2973 K,respectively.In one case,pitch was repeatedly infiltrated into the graphitized foam at 573K followed by carbonization to increase its density.Paraffin was infiltrated into the GFs to form GF/paraffin composites.Factors determining the thermophysical properties of the GFs and thermal behavior of the GF/paraffin composites were investigated.The microstructure and thermophysical properties of the foams were found to be greatly influenced by the pitch fraction,foaming temperature and foaming pressure.The thermal conductivity of the foams determines the thermal behavior of the GF/paraffin composites.The thermal diffusivity of the GF/paraffin composites investigated can be increased 768 to 1588-fold compared with that of paraffin.The latent heat of the composites has an almost linear relationship with the mass fraction of paraffin in the composites.The composites are suitable candidates for passive cooling of electronics.