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首页> 外文期刊>Journal of Materials Engineering and Performance >Interfacial Characteristics Investigation for One-Step EDM Drilling of Cooling Holes in TBCs
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Interfacial Characteristics Investigation for One-Step EDM Drilling of Cooling Holes in TBCs

机译：TBCS中冷却孔一步EDM钻孔的界面特征研究

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In this study, the one-step electrical discharge machining of inclined cooling holes is performed in thermal-barrier-coated nickel-based superalloys via the assisting electrode method. The effects of the process parameters, including the inclination angle, peak current, pulse duration, and duty cycle, on interfacial characteristics of cooling holes were investigated. The research results are as follows: After machining, the hardness of TBCs increases slightly and the adhesion strength of ceramic coating has a slight reduction. Delamination prevailingly appears at the ceramic coating/bonding coating interface, and its length at the trailing edge is greater than that at the leading edge. Increasing either the discharge energy or the duty cycle also aggravates the severity of the delamination. Under an excessive peak current of 22.5A, the complete spalling of the ceramic coating occurs in the vicinity of the holes. Additionally, a reduction in the inclination angle results in a significant increase in delamination cracking and poorer interface integrity. The interfacial microstructure features of the holes vary with the inclination angle. The large-scale spalling of ceramic coating is prone to occur at the trailing edge when using an inclination angle of 30 degrees. The spattering is susceptible to appear at the entrance of the holes under inclination angles of 60 degrees and 75 degrees, and its composition is primarily Ni, C, Zr, Cr, Nb, Fe, and Cu.
机译：在该研究中，倾斜冷却孔的一步放电加工通过辅助电极方法在热障涂覆的镍基超合金中进行。研究了处理参数，包括倾斜角度，峰值电流，脉冲持续时间和占空比的工艺参数对冷却孔的界面特性的影响。研究结果如下：加工后，TBCS的硬度略微增加，陶瓷涂层的粘合强度略有减少。陶瓷涂层/粘合涂布界面具有典型化的分层，并且其在后缘的长度大于前缘的长度。增加放电能量或占空比也加剧了分层的严重程度。在22.5A的过度峰值电流下，陶瓷涂层的完整剥落发生在孔附近。另外，倾斜角的降低导致分层裂缝和较差的界面完整性的显着增加。孔的界面微结构特征随倾斜角度而变化。当使用30度的倾斜角度时，在后缘处容易发生陶瓷涂层的大规模剥落。溅射易刻在60度和75度的倾斜角下出现在孔的入口处，其组合物主要是Ni，C，Zr，Cr，Nb，Fe和Cu。

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