| 摘要: |
| 航空发动机低压气机机匣内表面 Al 基封严涂层的使用，可以通过其自身的磨耗实现保护 TC4 叶尖的目的，但同时 Al 基封严涂层中以 Al 为主的基体材料易于大量黏着转移至 TC4 叶尖表面，使叶尖长度增加，影响发动机运行稳定性。采用直流脉冲磁控溅射工艺在钛合金表面沉积 TiB2 涂层，以期实现抗 Al 黏着磨损目的。具有致密结构的 TiB2涂层在钛合金表面膜基结合临界载荷(LC4)达 85.4 N。在高温销-盘摩擦磨损试验机上评价钛合金表面 TiB2涂层与纯铝销对摩(室温至 450 ℃) 的抗 Al 黏着磨损性能。与 TC4 基体相比较，TiB2 涂层可有效抑制 Al 的黏着转移。对摩铝销磨斑具有拖尾特征和剪切舌特征。 铝销向 TiB2涂层表面的机械涂抹和铝销对 Al 黏着转移层的剪切去除作用相互竞争，共同控制 Al 的黏着转移行为。TiB2涂层磨痕内保持低表面粗糙度可减小高温软化铝销的机械涂抹倾向。同时 TiB2涂层与 Al 黏着转移层间优异的化学稳定性可阻碍界面反应进行，降低界面结合强度，进而促进铝销对 Al 黏着转移层的剪切去除作用。钛合金表面 TiB2 涂层通过抑制铝销机械涂抹并增强铝销对 Al 黏着转移层的剪切去除而获得优异的抗 Al 黏着磨损性能。 |
| 关键词: 二硼化钛 纯铝 高温摩擦磨损 黏着转移 |
| DOI：10.11933/j.issn.1007-9289.20211101003 |
| 分类号:TH117 |
| 基金项目:辽宁省航发材料摩擦学重点实验室开放基金资助项目(SKLAMT201801) |
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| High-temperature Adhesive Wear Behavior Between TiB2 Coating on TC4 Substrate and Pure Al |
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WU Bi, GAO Siyang, XUE Weihai, DUAN Deli, LI Shu
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SHI Changxu Advanced Material Innovation Center, Chinese Academy of Sciences, Shenyang 110016 , China
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| Abstract: |
| The application of the Al-based seal coating on the inner case of the compressor of the aero-engine can protect the TC4 blade tip by the abrasion of the seal coating itself. However, the Al-based seal coating is apt to adhesively transfer to the blade tip and increase the blade length, which will deteriorate the stability of the rotating system. The TiB2 coating is deposited on the TC4 substrate by D.C. pulsed magnetron sputtering. The dense TiB2 coating deposited on TC4 substrates has an adhesive critical load (LC4) up to 85.4 N. The tribology behavior of the TiB2 coating against pure Al pin is evaluated on a high-temperature Pin-on-disc wear test rig (R.T.~450℃). Comparing with TC4 substrate, TiB2 coating can inhibit the adhesive transfer of Al. The Al pin shows the smear tail and shear tongue characteristics. There is a competition between the mechanical smearing effect of the Al pin and the shear effect of Al adhesive-transfer layer by the Al pin, which controls the process of Al adhesive transfer. The mechanical smearing effect of high-temperature softened Al pin is reduced for the lower roughness in the wear track of the TiB2 coating. Meanwhile, the interface reaction between the TiB2 coating and Al adhesive is restrained for the chemical inertness of TiB2. Its interface strength is reduced and the shear effect of Al adhesive-transfer layer is improved. Therefore, the TiB2 coating on TC4 substrate can reduce the Al-adhesive transfer by inhibiting the mechanical smear and enhancing the shear removal of Al pin. |
| Key words: titanium diboride aluminum high-temperature wear adhesive transfer |
