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焦炭试样或颗粒组份的机械强度通常有两种试验方法:一种是焦炭的抗破碎性,另一种是对焦炭颗粒做抗磨性试验。实验结果表明:焦炭的机械强度与气孔和颗粒的定向结构有关。针状焦的体积密度、热膨胀系数和机械强度之间存在着相互联系,而并有着相似的变化规律,当其中一种性能减少就会导致另一些性能也随着减少。这种现象可以用焦炭性质受孔隙和裂缝及结晶的优先定向排列程度等因素支配来解释,也就是孔隙和裂缝的存在及结晶的定向排列程度共同支配着机械强度和热膨胀系数。所以焦炭内部结构的定向性强,裂缝数量即气孔增加,焦炭的机械强度和热膨胀系数则减少。
There are usually two test methods for the mechanical strength of coke samples or particle components: one is the coke resistance and the other is the abrasion resistance test on coke particles. The experimental results show that the mechanical strength of coke is related to the orientation structure of pores and particles. Needle coke bulk density, coefficient of thermal expansion and mechanical strength are interrelated, and have a similar pattern of variation, when one of the performance reduction will lead to other properties also decreases. This phenomenon can be explained by the fact that coke properties are governed by the degree of preferential orientation of pores and fractures and crystallization, that is, the presence of pores and cracks and the degree of directional alignment of the crystallites that together govern the mechanical strength and coefficient of thermal expansion. Therefore, the internal structure of coke is highly directional, and the number of fissures increases, and the coke mechanical strength and thermal expansion coefficient decrease.