Laser & Optoelectronics Progress, Volume. 57, Issue 17, 171408(2020)
High-Temperature Oxidation Characteristics of Al2O3/CoNiCrAlY Coating Obtained via Laser Cladding
To improve the high-temperature oxidation characteristics of the Al2O3/CoNiCrAlY coatings, they are prepared on the surface of the K438 alloy via laser cladding. In addition, the effects of different energy densities on the microstructure and high-temperature oxidation behavior of materials are studied. The experimental results indicate that the Al2O3/CoNiCrAlY coatings comprise α-Co, γ-Ni/Cr, Al2O3, Ni3Al, and Ni2Cr3. The coating will exhibit an appropriate microstructure after the addition of Al2O3. Further, the coating is oxidized at 1100 ℃ to obtain AlN at the grain boundary. The oxide films form on the coating surface comprise an inner layer of α-Al2O3 oxide and an outer layer of Cr2O3 and (Co,Ni)(Al,Cr)2O4 mixed oxide. All the kinetic curves of the high-temperature oxidation of the coating under different energy densities conform to the parabolic law. The coating exhibits optimal high-temperature oxidation resistance when the energy density is 64.97 J/mm 3.
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Rui Zhang, Pan Ren, Yingfei Yang, Jiaoxi Yang, Shengfeng Zhou. High-Temperature Oxidation Characteristics of Al2O3/CoNiCrAlY Coating Obtained via Laser Cladding[J]. Laser & Optoelectronics Progress, 2020, 57(17): 171408
Category: Lasers and Laser Optics
Received: Feb. 21, 2020
Accepted: Mar. 19, 2020
Published Online: Sep. 1, 2020
The Author Email: Zhou Shengfeng (zhousf1228@163.com)