CAJ | 학술논문

本研究采用大气等离子与真空等离子喷涂技术制备了Al/BN、TiAl/BN两种金属和陶瓷复合型多孔涂层，用于航空发动机压气机部位的叶尖可磨耗封严。通过电化学测试和盐雾腐蚀实验对两种涂层的盐雾腐蚀性能进行了研究。结果表明，TiAl/BN涂层的腐蚀电位明显高于Al/BN涂层（约450mV）。同时，在极化曲线测试过程中发现TiAl/BN涂层出现了明显的钝化现象。经过960h标准盐雾腐蚀试验后，发现Al/BN涂层发生了较严重的腐蚀，而TiAl/BN涂层仅发生轻微的腐蚀。腐蚀后涂层的XRD分析表明，TiAl/BN涂层的腐蚀产物主要为Al(OH)3和AlO，没有发现Ti的腐蚀产物。TiAl/BN复合涂层中形成的TiAl合金是该涂层比Al/BN涂层更耐中性盐雾腐蚀的原因。
본연구채용대기등리자여진공등리자분도기술제비료Al/BN、TiAl/BN량충금속화도자복합형다공도층，용우항공발동궤압기궤부위적협첨가마모봉엄。통과전화학측시화염무부식실험대량충도층적염무부식성능진행료연구。결과표명，TiAl/BN도층적부식전위명현고우Al/BN도층（약450mV）。동시，재겁화곡선측시과정중발현TiAl/BN도층출현료명현적둔화현상。경과960h표준염무부식시험후，발현Al/BN도층발생료교엄중적부식，이TiAl/BN도층부발생경미적부식。부식후도층적XRD분석표명，TiAl/BN도층적부식산물주요위Al(OH)3화AlO，몰유발현Ti적부식산물。TiAl/BN복합도층중형성적TiAl합금시해도층비Al/BN도층경내중성염무부식적원인。
In this study, Al/BN and TiAl/BN composite porous coating which were used as abradable gap sealing between blade tip and shroud of aircraft turbine engines were prepared by atmospheric plasma spray and vacuum plasma spray, respectively. Corrosion behaviors of the coatings were investigated via the electrochemical and salt spray corrosion tests. The results indicate that, the potentiodynamic polarization curves of the TiAl/BN coating exhibits typical passivation, and the corrosion potential of TiAl/BN coating is about 450mV higher than that of Al/BN coating. After 960h salt corrosion tests, TiAl/BN coating occurred slight corrosion, by contrast, Al/BN has suffered serious corrosion damage. XRD analysis showed that, the major compositions of the corrosion products of the TiAl/BN coating were Al(OH)3 and AlO, in the absence of Ti. TiAl alloy which was generated during the fabricated process of TiAl/BN coating is the main reason for the superior corrosion resistance of TiAl/BN, compared with Al/BN coating.