一、前言 作为碳—石墨制品粘合剂和浸渍剂的煤焦油沥青,含碳量均在90％以上,但在常压焙烧条件下,沥青的析焦量大都在60％左右,这就是说在常压焙烧过程中,沥青所含碳有1/3以上损失掉了。由于这一损失,在碳—石墨制品中产生大量气孔,对制品的结构和性能产生重大影响,降低了这种材料的机械强度、导热性能,增大其电阻率而降低导电性能。 First, the preface As carbon-graphite binder and impregnating agent of coal tar pitch, the carbon content of more than 90%, but under normal pressure roasting conditions, most of the pitch of the asphalt in about 60%, that is to say In atmospheric roasting process, the asphalt contains more than 1/3 of the carbon lost. Due to this loss, a large number of pores are formed in the carbon-graphite product, which greatly affects the structure and properties of the product, reducing the mechanical strength and thermal conductivity of the material, increasing the resistivity and reducing the conductivity.