Kanlayakan Waroot, Lhosupasirirat Siraprapa, Amnatsin Chonradee, Verojpipath Nattarut, Pragobjinda Boonsueb, Srikhirin Toemsak
School of Materials Science and Innovation, Faculty of Science, Mahidol University, Nakhon Pathom 73170, Thailand.
Thai Carbon & Graphite Co., Ltd., 15/2 Phutthamonthon Sai IV Road, Kratumban District, Samutsakorn 74130, Thailand.
ACS Omega. 2023 Jul 21;8(30):27312-27322. doi: 10.1021/acsomega.3c02688. eCollection 2023 Aug 1.
A carbon block is a carbonaceous material used in various applications such as bearings, mechanical seals, and electrical brushes. This work aims to fabricate carbon blocks from industrial graphite waste, a residue from the cutting and tooling process of graphite block production. The ball milling process was used to fabricate ultrafine graphite waste to enhance the packing of carbon blocks. The milling performance was profoundly affected by dispersing agents in which sodium dodecyl sulfate (SDS), lignosulfonate (LS), and mixed dispersant (LS-SDS) were applied. The results showed that LS-SDS had the best milling performance, the greatest grinding index, and a flowable slurry, indicating the potentiality of this formulation for the environmentally friendly manufacture of ultrafine graphite waste. Carbon blocks were prepared from oven-dried ultrafine graphite waste, which was mixed with amorphous carbon and pitch. This carbon mixture was formed a block by compaction before carbonization and impregnation. The density of the fabricated carbon blocks increased from 1.76 to 1.83 g/cm after impregnation along with the increase in hardness, flexural strength, and reduction in electrical resistivity from 83, 62 MPa, and 40 μΩ m to 88, 81 MPa, and 39 μΩ m, respectively. The physical properties of carbon blocks prepared from ultrafine graphite waste were comparable to the properties of typical pristine carbon products.
碳块是一种碳质材料，用于各种应用，如轴承、机械密封和电刷。这项工作旨在利用工业石墨废料制造碳块，该废料是石墨块生产的切割和加工过程中产生的残余物。采用球磨工艺制备超细石墨废料，以提高碳块的填充性能。研磨性能受到分散剂的深刻影响，其中应用了十二烷基硫酸钠（SDS）、木质素磺酸盐（LS）和混合分散剂（LS-SDS）。结果表明，LS-SDS具有最佳的研磨性能、最大的研磨指数和可流动的浆料，表明该配方在环保制造超细石墨废料方面具有潜力。由烘干的超细石墨废料制备碳块，将其与无定形碳和沥青混合。这种碳混合物在碳化和浸渍之前通过压实形成块状。浸渍后，所制造碳块的密度从1.76 g/cm增加到1.83 g/cm，同时硬度、抗弯强度增加，电阻率从83、62 MPa和40 μΩ·m分别降低到88、81 MPa和39 μΩ·m。由超细石墨废料制备的碳块的物理性能与典型的原始碳产品的性能相当。
