钛合金表面TiB2涂层与纯铝的高温黏着磨损行为  

High-temperature Adhesive Wear Behavior Between TiB2 Coating on TC4 Substrate and Pure Al

作　　者：吴彼 高禩洋[1] 薛伟海 段德莉[1] 李曙[1] WU Bi;GAO Siyang;XUE Weihai;DUAN Deli;LI Shu(SHI Changxu Advanced Material Innovation Center,Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]中国科学院金属研究所师昌绪先进材料创新中心,沈阳110016

出　　处：《中国表面工程》2022年第3期64-72,共9页China Surface Engineering

基　　金：辽宁省航发材料摩擦学重点实验室开放基金资助项目(SKLAMT201801)。

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TiB_(2)涂层,以期实现抗Al黏着磨损目的。具有致密结构的TiB_(2)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TiB_(2)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,TiB_(2)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TiB_(2)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。TiB_(2)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。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 TiB_(2) coating is deposited on the TC4 substrate by D.C.pulsed magnetron sputtering.The dense TiB_(2) coating deposited on TC4 substrates has an adhesive critical load(LC4)up to 85.4 N.The tribology behavior of the TiB_(2) coating against pure Al pin is evaluated on a high-temperature Pin-on-disc wear test rig(R.T.~450℃).Comparing with TC4 substrate,TiB_(2) 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 TiB_(2) coating.Meanwhile,the interface reaction between the TiB_(2) coating and Al adhesive is restrained for the chemical inertness of TiB_(2).Its interface strength is reduced and the shear effect of Al adhesive-transfer layer is improved.Therefore,the TiB_(2) coating on TC4 substrate can reduce the Al-adhesive transfer by inhibiting the mechanical smear and enhancing the shear removal of Al pin.

关 键 词：二硼化钛 纯铝 高温摩擦磨损 黏着转移 

分 类 号：TH117[机械工程—机械设计及理论]