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1.引言在生产炭和石墨制品的传统工艺过程中,大部份制品都是用挤压工艺成型的。挤压中各向异性的发展除了受到骨科类型及压缩比(如图1)的影响外,还在很大程度上受焦炭—沥青混合料的流变特性所控制。此外,成型操作中的一项重要参数即挤压制品所需的压力也与焦炭一沥青混合料的流变特性有直接的关系。一些已发表的研究报告表明,焦炭-沥青混合料的流变特性可以模拟成宾汉体。然而,所有的实验都县在毛细流变仪或平行板流变仪中进行
1. Introduction In the traditional process of producing carbon and graphite products, most of the products are formed by extrusion. In addition to the influence of orthopedic type and compression ratio (Figure 1), the development of anisotropy in extrusion is largely controlled by the rheological properties of coke-asphalt mixtures. In addition, an important parameter in the forming operation, the pressure required for extruding the product, is also directly related to the rheological behavior of the coke-asphalt mixture. Some published studies have shown that the rheological properties of coke-asphalt mixtures can be modeled as Bingham’s body. However, all experiments were performed in capillary rheometer or parallel plate rheometer