众所周知,孔隙率对炭材料及其制品在加热、冷却和高温工作时的性状有很大影响,同时能改变它们的热膨胀系数值。和在考虑了制品晶格和晶体结构的热膨胀存在各向异性的基础上,提出了一种利用调节系数γ和β评价孔隙度对石墨热膨胀影响的方法。调节系数根据下列联立方程式计算:式中α_∥和α_⊥分别为平行于和垂直于挤压轴线方向的制品线膨胀系数(KTP),α_a和α_c分别为“c”“a”结晶轴线方向的晶格线膨胀系数;K_1～K_4结构系数。调节系数γ和β决定着“消耗”在能观察到的制品宏观热膨胀上的那部分晶格热膨胀值 It is well-known that porosity affects greatly the behavior of carbon materials and their products during heating, cooling and high temperature operations, while changing their CTE values. Based on the existence of anisotropy of thermal expansion of crystal lattice and crystal structure, a method of evaluating the influence of porosity on thermal expansion of graphite was proposed by using adjustment coefficients γ and β. The adjustment factor is calculated according to the simultaneous equations: where α_∥ and α_⊥ are the product linear expansion coefficients (KTP) parallel to and perpendicular to the extrusion axis, respectively, and α_a and α_c are respectively “c” “a” Of the lattice coefficient of linear expansion; K_1 ~ K_4 structural coefficient. The adjustment factors γ and β determine the portion of the lattice thermal expansion that “consumes” on the macroscopic thermal expansion of the article that can be observed