Kobayashi A, Ando Y, Kurokawa K, Hejwowski T
Osaka University, Ibaraki, Osaka, 567-0047, Japan.
J Nanosci Nanotechnol. 2011 Oct;11(10):8853-8. doi: 10.1166/jnn.2011.3450.
In thermal barrier coatings (TBC), failure occurs near or at the interface between the metallic bondcoat and topcoat. On high temperature conditions, an oxide scale which is named thermally grown oxide (TGO) occurs along the bond/topcoat interface. For diminishing the creation of TGO, a dense coating with low residual stress and thermal stress buffer layer was preferable. High hardness ceramic coatings could be obtained by gas tunnel type plasma spraying, and the deposited coating had superior property in comparison with those deposited by conventional type plasma spray method. In this study, the gas tunnel type plasma spraying system was utilized to produce a zirconia/alumina functionally graded thermal barrier coating and discussed its physical and mechanical properties, thermal behavior and high temperature oxidation resistance of the coating are discussed. Consequently, the proposed system exhibited superior mechanical properties and oxidation resistance at the expenses of a slightly lower thermal insulating effect. This interlayer is preferred in order to minimize the detrimental effect of the phase transformation of gamma-Al2O3 to alpha-Al2O3.
在热障涂层（TBC）中，失效发生在金属粘结层和面层之间的界面附近或界面处。在高温条件下，沿着粘结层/面层界面会出现一种名为热生长氧化物（TGO）的氧化层。为了减少TGO的产生，具有低残余应力的致密涂层和热应力缓冲层是优选的。通过气体隧道式等离子喷涂可以获得高硬度陶瓷涂层，与传统等离子喷涂方法沉积的涂层相比，沉积的涂层具有优异的性能。在本研究中，利用气体隧道式等离子喷涂系统制备了氧化锆/氧化铝功能梯度热障涂层，并讨论了其物理和力学性能、热行为以及涂层的高温抗氧化性。结果表明，所提出的系统具有优异的力学性能和抗氧化性，但热绝缘效果略低。为了使γ -Al2O3向α -Al2O3相变的有害影响最小化，这种中间层是优选的。
