Bonding and anti-oxidation properties of cermet composite coatings with Ni on surface of nickel-based superalloy for aviation engines
GAO Bo1, ZENG Fanhao1,2, GU Yi3, LI Yi1
1. The State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China; 2. The National Key Laboratory of Science and Technology on High-Strength Lightweight Structural Materials, Changsha 410083, China; 3. School of Materials Science and Engineering, Central South University, Changsha 410083, China
Abstract In order to make the nickel alloy used in aerospace engine work safely and efficiently under the conditions of high temperature, high pressure and oxygen enrichment. A new Ni/cermet coating containing B2O3-A12O3- BaO-CeO2-ZrO2 (Ni/BACZ) were prepared on GH4586 nickel-based alloy by slurry method. The surface and cross section morphologies and the phase composition of the coating were analyzed by SEM and XRD respectively. The properties of coating were analyzed by the stretching test, oxidation test and thermal shock experiment. The results show that the structure of Ni/BACZ coating is compact and solid with the matrix, and the main phases are Ni, Al2O3 and CeBO3. The coating is firmly combined with the matrix, and the tensile strength is more than 55 MPa. Furthermore, the oxidation resistance of GH4586 nickel-base alloy with cermet coating is improved 7 times than that of the uncoated alloy at 900 ℃. Ni can reduce the coating cracks produced by the high temperature thermal stress, improve the toughness of the coating so that it has a great thermal shock resistance.
GAO Bo,ZENG Fanhao,GU Yi, et al. Bonding and anti-oxidation properties of cermet composite coatings with Ni on surface of nickel-based superalloy for aviation engines[J]. Materials Science and Engineering of Powder Metallurgy, 2018, 23(5): 527-533.
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2018, Vol. 23 
