Preparation of high performance carbonized/graphitized carbon blocks via self-sintering of MCMBs: Study of sintering behavior and development of organic additives

• Main Authors: Ming-Shiou Yeh, 葉名修
• Other Authors: Jiin-Jiang Jow
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/qy56ah

碩士 === 國立高雄應用科技大學 === 化學工程與材料工程系博碩士班 === 102 === Mesocarbon microbeads (MCMBs) blended with solid resin (SR) were used for the preparation of high performance carbonized/graphitized products in this work. The sintering behavior of the raw materials and the improvement effect of various organic additives were investigated. The effects of SR composition on the sintering behavior and properties of the products were examined by using two different SR samples with and without HNO3 treatment, respectively. The results show that the SR with a lighter component (SR1) is a better one for the manufacture of the carbon products. The HNO3 treatment of the SR leads to a heavier composition and worse properties of the products. The effects of various organic additives, including carbon nanotube (CNT), p-toluene sulfonic acid (PTSA), biphenol A (BPA), acrylic acid (AA), butylated hydroxyanisole (BHA) and poly(isobutyl methacrylate) (PiBMA), on the sintering behavior of SR1 and properties of sintered samples containing MCMB+SR1 were examined. TGA/DTA results show that the weight loss peak (-dw/dT) at around 300~450℃ are reduced in the presence of the CNT, BPA and AA, while that at around 300~450℃ are increased in the presence of PTSA and PiBMA. The results of density and bending strength tests show that the decrease of -dw/dT at around 300~450℃effectively improve the performance of carbonized products, i.e. depressing the weight at around 300~450℃ is important during the sintering reaction of manufacture of sintered MCMB products. BPA were found to be an effective additive to reduce the -dw/dT peak at 300~450℃ and improve the performance of carbonized products, and were further used together with GMA and CB as joint-additive to modify the sintering behavior of the raw materials. TGA/DTA results indicate that there is a cooperative effect of the joint-additive BPA+GMA+ CB on improving the sintering reaction of the materials: the BPA and GMA reduce the formation of pyrolysis volatile gas during the sintering of the MCMB at around 300~450℃, while CB accelerates the pyrolysis reaction and shifts the temperature of the occurrence of the volatile gas to a lower range. The mechanical and electrical properties of the graphitized products are effectively improved in the present of the joint-additive BPA+GMA+CB. The maximum density (2.156 g/cm3) and bending-strength (60.8MP) of the graphitized products with the joint-additive BPA+GMA+CB is 7 and 59% higher, and the minimum electrical resistivity (1.23 mΩcm) is 12% lower, respectively, than those without the additives.