Building a nano-crystalline alpha-alumina layer at a liquid metal/sapphire interface by ultrasound
Building a nano-crystalline alpha-alumina layer at a liquid metal/sapphire interface by ultrasound
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通过超声波在液态金属/蓝宝石界面构建纳米晶α-氧化铝层
DOI：
10.1016/j.ultsonch.2014.05.008
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发表时间：
2015
影响因子：
8.4
通讯作者：
an
中科院分区：
文献类型：
--
作者：
Cui Wei;Yan Jiuchun;Dai Yan;Li D;an
金属/陶瓷界面过渡层在陶瓷连接中起着非常重要的作用。在这项研究中，蓝宝石块超声浸渍在液体锡锌铝合金。结果表明，在230 °C的环境气氛中，超声能促进Sn-Zn-Al/蓝宝石界面处Al的快速氧化反应，生成纳米晶α-Al 2 O3层（NCAL）。在NCAL的0.2nm边界层中，晶格与蓝宝石衬底很好地匹配。因此，通过NCAL形成从蓝宝石到金属的晶格的平滑过渡。采用Sn-Zn-Al钎料对蓝宝石进行了超声钎焊。接头的压剪强度达到了43-48 MPa，与其它Sn合金中掺杂Ti或稀土元素的Al 2 O3接头相比，具有较高的抗压剪强度。从而揭示了超声波钎焊的一种新机理，即在固体表面形成氧化物过渡层。我们希望这种声化学过程适用于其他金属/氧化物系统。
Transitional layers at the metal/ceramic interface play an very important role in ceramic joining. In this study, sapphire blocks were ultrasonically dipped in liquid Sn–Zn–Al alloy. It is found that the ultrasound promoted rapid oxidation reaction of aluminum at the Sn–Zn–Al/sapphire interface at 230 °C in the ambient atmosphere, resulting in the formation of a nano-crystalline α-Al2O3layer (NCAL). In a ∼2 nm boundary layer of the NCAL, the lattice matches the sapphire substrate well. Thus, a smooth transition of the lattice from sapphire to metal was formed through the NCAL. Ultrasonically soldered sapphire joints were made with Sn–Zn–Al as the filler alloy. Compressive shear strength of the joints reached 43–48 MPa, which is relatively high comparing to other Al2O3joints made of Sn alloys doped with Ti or Rear Earth elements. Thus, a new mechanism of ultrasonic soldering, i.e. building an oxide transitional layer on the surface of the solid, was revealed. We expect this sonochemical process to be applicable to other metal/oxide systems.