紀要論文

紀要論文

text

Transactions of JWRI. 2011, 40(1), p. 53-58

Cyclic Oxidation Behavior of CoNiCrAlY Coatings Produced by LVPS and HVOF Processes

英語

text

2011-06

CoNiCrAlY bond coatings for thermal barrier systems were produced by low vacuum plasma spray (LVPS) and high velocity oxy fuel (HVOF) on the nickel base superalloy, IN738LC. High temperature cyclic oxidation resistance of coated samples was performed in 1100℃ for 100 cycles including 1h holding at high temperature and cooling to room temperature by air flow. Oxidation kinetics were determined by weight gain measurement of samples in each cycle, microstructural characterizations of coatings and oxide scales were investigated by scanning electron microscope equipped with EDS, and X-ray diffraction methods. The results proved better cyclic oxidation of CoNiCrAlY-HVOF coatings at the initial stage of oxidation and better oxidation behavior of LVPS coatings at continuation. The enhanced cyclic oxidation resistance of the HVOF coating at the initial stage was due to the nucleation of α-Al₂O₃ during the coating process and formation of continuous protective oxide layer at the initial stage of oxidation, but at continuation, large grain oxide, unsuitable adherence and existence of some microcracks in the TGO cause to easily spallation and severe oxidation in the HVOF samples was observed.

10.18910/8718

8718

Cyclic Oxidation Behavior of CoNiCrAlY Coatings Produced by LVPS and HVOF Processes

大阪大学接合科学研究所

英語

2011-06

Transactions of JWRI

40

1

53

58

https://hdl.handle.net/11094/8718

10.18910/8718

https://doi.org/10.18910/8718