刘振刚
,
刘宜汉
,
罗洪杰
,
姚广春
材料保护
石墨化学镀铜具有其他金属材料无法比拟的自润滑性能,传统的甲醛化学镀铜存在镀液不稳定、镀层疏松、污染环境等缺点.以锌粉为还原剂、醋酸为分散剂、硫酸铜为主盐对石墨颗粒表面化学镀铜,重点研究了硫酸铜浓度、锌粉用量、醋酸用量以及反应温度、反应时间等因素对铜镀层性能的影响,得出了石墨化学镀铜的最佳工艺参数.结果表明:与传统的甲醛化学镀铜体系相比,此工艺大大提高了镀液的有效装载量,加快了反应速度,缩短了反应时间,降低了反应温度,并且避免了甲醛对环境的污染.
关键词:
化学镀铜
,
石墨颗粒
,
润湿性
,
镀层质量
魏健宁
,
欧阳卫强
,
余剑敏
,
李根梅
机械工程材料
运用空气加压渗流技术制备了宏观石墨颗粒增强的工业纯铝金属基复合材料,在25～400℃温度范围和频率为0.5,1.0和3.0 Hz条件下在多功能内耗仪上测量了不同材料的内耗和相对动力学模量;用透射电子显微镜对材料的显微组织进行了观察;依据内耗测量和微观分析讨论了宏观石墨颗粒对工业纯铝阻尼行为的影响.结果表明:复合材料的阻尼性能随着宏观石墨颗粒体积分数的增加而增大,阻尼性能比致密工业纯铝提高了2～3倍.
关键词:
阻尼
,
内耗
,
石墨颗粒
,
工业纯铝
Zhengang Liu Guoyin Zu Hongjie Luo Yihan Liu Guangchun Yao
材料科学技术（英文）
Al alloy matrix composites reinforced with copper-coated graphite particle have been prepared by melt stirring process in this work. The effect of the addition of Mg on distribution of the graphite particles has been investigated. Scanning electron microscopy (SEM) was used to observe the micro-morphology of Al alloy matrix composites reinforced with graphite particles. Meanwhile, the content of graphite was analyzed in the different position of casting by dissolution method and the mechanical properties of the composites were detected. The results show that the content of graphite increase with increasing Mg content; the graphite particles distribute uniformly in the particle reinforced metal matrix composites (PMMC) with 0.6 wt pct Mg; however, the agglomeration of the graphite particles is observed obviously in the matrix when Mg content is more than 1.0 wt pct. In addition, the proper Mg addition amount is beneficial to enhance the mechanical properties of the graphite particles reinforced Al alloy matrix composites and the abrasion resistance of the materials due to a reduce friction coefficient.
关键词:
Graphite particles
,
铝合金基复合材料；分布；镁；力学性能
