Effect of graphene nanosheets on melting point and wettability of AgCuTi filler
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摘要: 采用球磨法在AgCuTi钎料中添加不同质量分数的石墨烯纳米片(GNSs)制备出复合钎料，利用差示扫描量热仪(DSC)，SEM以及XRD等方法研究了微量的石墨烯纳米片对AgCuTi钎料微观形貌、熔点以及在蓝宝石表面润湿性的影响. 结果表明，球磨法对GNSs-AgCuTi复合钎料的物相没有影响，石墨烯均匀地分散在AgCuTi颗粒周围；复合钎料熔点随着石墨烯含量的增加而降低，当石墨烯含量为0.5%，熔点降低了3.2 ℃；微量的石墨烯，改善钎料在蓝宝石表面的润湿性，0.3%GNSs-AgCuTi复合钎料的润湿角减小了4.4°，铺展面积增加了10 mm2，而过多的石墨烯也使得复合钎料的润湿性变差；石墨烯与元素Ti反应生成TiC，复合钎料与蓝宝石界面反应产物为Ti3Cu3O相.Abstract: Graphene nanosheets (GNSs) with different mass fractions were added to the AgCuTi filler by ball milling. The effects of trace amounts of graphene nanosheets on the morphology, melting point and wettability of AgCuTi fillers were investigated by differential scanning calorimetry (DSC), SEM and XRD. The results showed that the ball milling method had no effect on the phase of the GNSs-AgCuTi composite filler, and the graphene was uniformly dispersed around the AgCuTi particles. The melting point of the composite filler decreased as the graphene content increased. When the graphene content was 0.5%, the melting point was reduced by 3.2 °C. A trace amount of graphene improved the wettability of the filler on the sapphire surface. The wetting angle of the 0.3% GNSs-AgCuTi composite brazing filler was reduced by 4.4°, and the spreading area was increased by 10 mm2, while the excessive graphene also deteriorated the wettability of the composite brazing filler. Graphene reacted with the element Ti to form TiC. The interfacial reaction product of the composite filler and sapphire was Ti3Cu3O phase.
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Keywords:
- composite filler /
- sapphire /
- melting point /
- wettability
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