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首页> 外文期刊>Surface & Coatings Technology >Effects of initial oxidation on β phase depletion and oxidation of CoNiCrAlY bond coatings fabricated by warm spray and HVOF processes
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Effects of initial oxidation on β phase depletion and oxidation of CoNiCrAlY bond coatings fabricated by warm spray and HVOF processes

机译：初始氧化对热喷涂和HVOF工艺制备的CoNiCrAlY粘结涂层的β相耗竭和氧化的影响

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Thermal barrier coatings (TBC) have been applied extensively onto the high-temperature components in turbine engines to prolong their service life in extremely harsh environments. TBCs are typically composed of a ceramic top coating for thermal insulation and a metallic bond coating (BC) for oxidation resistance and providing adhesion to the top coating. MCrAlY, where M stands for Co, Ni or an alloy of these elements, is a widely used material for BC and usually produced by low pressure plasma spraying (LPPS) in industry. Recently high velocity oxy-fuel (HVOF) spraying is attracting significant attention as a more economical alternative procedure to LPPS. In terms of the quality of sprayed coatings, however, LPPS is still superior in terms of oxygen pick-up during coating preparation, which should affect the performance as a bond coating in service. In this study, a modified HVOF process, so called 2-stage HVOF or warm spray (WS) was applied to deposit a CoNiCrAlY alloy. Comparisons between BCs fabricated by HVOF and WS were made in terms of microstructure, surface morphology, and cyclic and isothermal oxidation behaviors in air at 1423. K up to 100. cycles and 100. h respectively. The results showed that rougher and less oxidized BCs were deposited by the WS process, which exhibited slower kinetics of β-phase depletion during oxidation. A simple Al diffusion model revealed that apparently a small difference in the initial oxidation between the two spraying processes had significant influence on the β-depletion phenomena, which may influence the life time as a bond coating.
机译：隔热涂层（TBC）已广泛应用于涡轮发动机的高温部件，以延长其在极端恶劣环境下的使用寿命。 TBC通常由用于隔热的陶瓷面涂层和用于抗氧化并提供对面涂层的附着力的金属粘结涂层（BC）组成。 MCrAlY（M代表Co，Ni或这些元素的合金）是BC广泛使用的材料，通常在工业上通过低压等离子体喷涂（LPPS）生产。最近，作为一种更经济的LPPS替代方法，高速氧燃料（HVOF）喷涂正引起人们的广泛关注。然而，就喷涂涂料的质量而言，LPPS在涂料制备过程中的吸氧方面仍然优越，这会影响使用中作为粘结涂料的性能。在这项研究中，采用了改进的HVOF工艺，即所谓的两阶段HVOF或热喷涂（WS），以沉积CoNiCrAlY合金。比较了HVOF和WS制备的BCs的微观结构，表面形态，以及在空气中在1423. K循环至100. h和100. h时的循环和等温氧化行为。结果表明，WS过程沉积了较粗糙且氧化程度较低的BC，在氧化过程中表现出较慢的β相耗尽动力学。一个简单的Al扩散模型表明，两个喷涂过程之间的初始氧化差异很小，对β耗竭现象有重大影响，这可能会影响粘结涂层的使用寿命。

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