期刊
SURFACE & COATINGS TECHNOLOGY
卷 398, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2020.126093
关键词
High-entropy alloy; High-speed laser cladding; Oxidation behavior; CuAlNiCrFe; Thermal barrier coating; Bond coat
资金
- National Key R&D Program of China [2018YFB2002000]
- National Natural Science Foundation of China [51761145108]
- Key Technological Innovations Project of Shandong Province [2019JZZY010802]
A promising new bond coat using CuAlNiCrFe high-entropy alloy was proposed in this paper. The difference in pre-oxidation conditions between the traditional thermal-sprayed MCrAlY bond coat and CuAlNiCrFe high-entropy alloy bond coat deposited using high-speed laser cladding was investigated. The result confirmed that the CuAlNiCrFe high-entropy alloy bond coat deposited using high-speed laser cladding can complete the pre-oxidation faster and form a continuous alpha-Al2O3 thermally grown oxide (TGO), which shortens the initial oxidation stage, thereby avoiding the formation of other oxides and spinel structures. In the subsequent isothermal oxidation process, the block-like structure of the high-speed laser cladding layer and the sluggish diffusion effect of the high-entropy alloy work together to ensure the slow and continuous supply of aluminum element to TGO layer and obtain a low growth rate. Also, the diffusion between the bonding layer and the substrate is controlled at a low level, and the new CuAlNiCrFe bond coat exhibits excellent oxidation and diffusion resistance. With the consumption of aluminum, the phase structure of the high-entropy alloy bond coat changed from BCC to FCC, but it still maintained a stable simple solid solution structure.
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