短碳纤维增强铝基复合材料的制备工艺及性能研究

发布时间：2018-04-04 18:19

  本文选题：铝基复合材料　切入点：碳纤维镀铜　出处：《河南科技大学》2015年硕士论文

【摘要】：碳纤维是目前的热门材料之一,它的低热膨胀系数、高强度、以及耐磨减磨等优异性能被用于越来越多的高科技行业。碳纤维增强的铝基复合材料具有良好的耐磨性,低的热膨胀系数,优异的导电、导热性等使其拥有着非常广阔的应用前景。本文采用粉末冶金的方法制备碳纤维增强的铝基复合材料,为了避免碳纤维与铝基体的浸润性差、易发生反应等问题的发生,本文对碳纤维进行了化学镀铜的研究,优化了镀铜工艺。使用了热压法进行复合材料的制备,研究出了合适的热压工艺,并对复合材料的拉伸强度、热膨胀系数、摩擦系数、磨损率进行了研究,实验的结果表明如下:1.在化学镀铜中,在电动机械搅拌下,最佳的镀铜工艺为:CuSO4·5H2O浓度20g/L、EDTA-2Na浓度25g/L、酒石酸钾钠浓度25g/L、甲醛15ml/L、二联吡啶15mg/L、亚铁氰化钾20mg/L、氢氧化钠16g/L、温度为60℃、pH值为12、碳纤维加入量为3g/L。2.碳纤维对于铝基复合材料的硬度、致密度、抗拉强度、热膨胀系数、摩擦系数以及磨损率有着显著的影响。复合材料的致密度随着碳纤维的质量分数的增加而下降,而布氏硬度和抗拉强度在碳纤维质量分数为5%时经过热处理达到最高,为HB102.6和278MPa;铝基复合材料的热膨胀系数受碳纤维的加入影响比较大,热处理后碳纤维质量分数为5%时比无碳纤维添加的复合材料的热膨胀系数减小了47.4%;复合材料的摩擦系数随着碳纤维质量分数的提升而逐渐减小,在碳纤维质量分数为5%时,复合材料的磨损率达到最小。综合上述,碳纤维的质量分数为5%时,复合材料的综合性能最佳。3.碳纤维增强铝基复合材料的磨损机理主要为磨粒磨损和粘着磨损,碳纤维的增强机理主要为细化晶粒、载荷转嫁和约束机体形变。
[Abstract]:Carbon fiber is one of the most popular materials at present. Its excellent properties such as low thermal expansion coefficient, high strength, wear resistance and wear reduction are used in more and more high-tech industries.Carbon fiber reinforced aluminum matrix composites have good wear resistance, low thermal expansion coefficient, excellent electrical conductivity, thermal conductivity and so on.In this paper, carbon fiber reinforced aluminum matrix composites were prepared by powder metallurgy. In order to avoid the problems of poor wettability and easy reaction between carbon fiber and aluminum matrix, the electroless copper plating of carbon fiber was studied in this paper.The copper plating process was optimized.The hot pressing method was used to prepare the composite material, and the suitable hot pressing process was studied. The tensile strength, thermal expansion coefficient, friction coefficient and wear rate of the composite were studied. The experimental results showed as follows: 1.鍦ㄥ寲瀛﹂晙閾滀腑,鍦ㄧ數鍔ㄦ満姊版悈鎷屼笅,鏈，

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