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Preparation of pitch-based carbon-copper composites for electrical applications

机译：沥青基碳铜复合材料的制备

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Carbon-copper composites were prepared from ternary systems consisting of a mixture of pitch/graphite/copper, using a binder coal-tar pitch, two types of graphite (natural and synthetic graphite) and electrolytic copper powder. Prior to the preparation of the carbon-copper composites, pitch: graphite mixtures (30:70 and 50:50 wt percent) were thermally treated in order to remove pitch volatiles and improve the carbon yield. The treated mixtures were then combined with copper in different proportions (80:20, 70:30, 60:40 and 50:50 wt percent) by a mechanical procedure. The resultant temary systems were moulded (200 and 300 MPa) into prismatic specimens and carbonized to 850 deg C. For comparative purposes, carbon composites were prepared with the treated mixtures using similar experimental conditions to those of carbon-copper composites. The results show coal-tar pitch to be an excellent binder for this type of materials. The presence of copper enhances the electrical conductivity and flexural strength of the composites. However, the right choice of graphite is crucial for obtaining high-performance carbon-copper composites.
机译：碳-铜复合材料是由三元体系制备的，该三元体系由沥青/石墨/铜的混合物，粘结剂煤焦油沥青，两种类型的石墨（天然和合成石墨）和电解铜粉组成。在制备碳-铜复合材料之前，对沥青：石墨混合物（30:70和50:50重量百分比）进行热处理，以去除沥青挥发物并提高碳收率。然后通过机械方法将处理过的混合物与铜以不同比例（80：20、70：30、60：40和50:50重量百分比）结合。将所得的三元体系模制（200和300 MPa）制成棱柱形试样，并碳化至850℃。出于比较目的，使用与碳-铜复合材料相似的实验条件，用处理过的混合物制备碳复合材料。结果表明，煤焦油沥青是这类材料的优良粘合剂。铜的存在增强了复合材料的电导率和抗弯强度。但是，正确选择石墨对于获得高性能碳铜复合材料至关重要。

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