A kind of nickel-molybdenum-aluminum rare earth coating and preparation method thereof

Abstract

The invention discloses Ni-Mo-Al-rare earth coating and a preparation method thereof. The Ni-Mo-Al-rear earth coating comprises four elements including Ni, Mo, Al and rare earth and particularly comprises the following four elements in percentage by mass: 53.90-19.47% of Ni, 33.68-42.83% of Mo, 9.00-18.50% of Al and 3.42-19.20% of rare earth. The preparation method comprises the following steps: firstly adding a nickel salt, a molybdenum compound, an aluminum salt and a rare earth salt into an ionic liquid, and stirring for dissolving to obtain a nickel salt-molybdenum compound-aluminum salt-rare earth salt-ionic liquid electroplating liquid; then, adding a to-be-plated part serving as a negative pole and Ni serving as a positive pole into the electroplating liquid and electroplating at 30-60 DEG C for 10-60min under the conditions that the current density is 10-25A / dm<2> and the rotating speed is 100-600rpm; washing the electroplated part by the end of the electroplating; and drying to finally obtain Ni-Mo-Al-rare earth coating with good oxidation corrosion resistance on the surface of the electroplated part.

Description

technical field [0001] The invention relates to a nickel-molybdenum-aluminum rare earth coating and a preparation method thereof. Background technique [0002] With the development of aero-engines toward high thrust-to-weight ratios, the design inlet temperature of aero-engines continues to increase, and the use of high-temperature structural materials alone cannot meet the urgent requirements of the rapid development of advanced aero-engines. At present, the practical way to greatly increase the operating temperature of aero-engines is to use thermal barrier coating technology. Most of the thermal barrier coatings that have been applied in practice have a double-layer structure, and the ceramic layer is used as the surface layer of the thermal barrier coating because of its heat insulation, corrosion resistance, erosion and erosion properties. Due to the thermal expansion coefficient mismatch between ceramics and high-temperature structural materials, a metal bonding layer...

AI Technical Summary

Problems solved by technology

[0003] At present, thermal barrier coatings use nickel coating, nickel molybdenum coating, nickel molybdenum rare earth coating, nickel molybdenum-molybdenum disilicide coating, nickel molybdenum rare earth-molybdenum disilicide coating as the bonding layer, but the above-mentioned bonding layer materials all have oxidation resistance. Corrosion performance is not very strong and other technical problems