焦炭颗粒增强铜-石墨复合材料的制备与性能研究

以改性酚醛树脂为粘结剂,以焦炭粉为颗粒增强相,采用传统模压成型工艺制备了一系列铜-石墨复合材料,并研究了焦炭粉的添加对复合材料的力学性能、导电性能及磨损性能的影响.结果表明:当焦炭粉质量分数为35%时,复合材料具有较好的综合性能.随着焦炭粉的加入,复合材料的弯曲强度有了显著提高,在焦炭粉质量分数为35%时弯曲强度达到最大值68.8MPa,比未添加焦炭粉时提高了近36%;同时,当焦炭粉质量分数为35%时,复合材料的电阻率已经达到了现用浸金属滑板的导电水平;焦炭粉质量分数35%的复合材料具有最低的磨损率,且在磨损过程中能在磨损表面形成较为完整的自润滑膜.

PREPARATION AND CHARACTERIZATION OF COKE PARTICULATE REINFORCED COPPERGRAPHITE COMPOSITES

Copper-graphite composites were prepared by moulding method using a modified phenolic resin as the binder and coke powder as the reinforcing particle. The effect of coke content on the mechanical property, electrical conductivity and wear property of copper- graphite composites was studied in detail The main results show the composites with the coke powder content of 35% have excellent integrated pedormance. The increasing content of coke powder helps to improve the mechanical strength. The maximum bending strength of 68. 8 MPa is obtained at the coke powder content of 35%, which is increased by nearly 36% than that of the specimen without coke powder. In addition, the electrical conductivity of the composite with the coke powder of 35% has reached the level of the applied impregnated metal carbon strips; copper - graphite composites with coke powder content of 35% have the minimum wear rate and form a comparatively whole self-lubricating film on the wear surface during the wear process.