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Effect of the average grain size of green pitch coke on the microstructure and properties of self-sintered graphite blocks
New Carbon Materials ( IF 5.7 ) Pub Date : 2020-05-28 , DOI: 10.1016/s1872-5805(20)60483-8
Hong-chao Zhao , Zhao He , Xiao-hui Guo , Peng-fei Lian , Zhan-jun Liu

Three self-sintered graphite blocks (SGs) were prepared from green pitch cokes with different average grain sizes (5.1, 3.1 and 1.9 μm) using cold isostatic compaction. The microstructures and properties of the SGs were characterized by XRD, SEM, mercury porosimetry, mechanical and thermal tests. Results indicated that the microstructures and properties of the SGs were closely related to the green coke granularity. When decreasing the average grain size of the green coke from 5.1 to 1.9 μm, the density, mechanical properties, Shore hardness and coefficient of thermal expansion increased while the degree of graphitization, crystallite diameter, thermal conductivity, median pore diameter and porosity decreased. The median pore diameters of the SGs were all in the nanometer range, which implied that they could effectively inhibit the infiltration of molten salt and might be used in molten salt reactors.



中文翻译:

生沥青的平均粒径对自烧结石墨块组织和性能的影响

使用冷等静压法,由具有不同平均晶粒尺寸(5.1、3.1和1.9μm)的生沥青焦制备三个自烧结石墨块(SGs)。通过X射线衍射,扫描电镜,水银孔隙率法,机械和热测试对SG的微观结构和性能进行了表征。结果表明,SGs的微观结构和性能与生焦粒度密切相关。当将生焦的平均粒度从5.1减小到1.9μm时,密度,机械性能,肖氏硬度和热膨胀系数增加,而石墨化程度,微晶直径,导热率,中值孔径和孔隙率降低。SG的中值孔径均在纳米范围内,

更新日期:2020-05-28
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