A high temperature protective coating material suitable for single crystal nickel base superalloy blades
A nickel-based superalloy, protective coating technology, applied in metal material coating process, coating, vacuum evaporation plating and other directions, can solve the problem of poor anti-oxidation performance, and achieve excellent high-temperature oxidation resistance and non-diffusion. Obvious, thermally grown oxide film flattening effect
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Embodiment 1
[0023] Vacuum smelting and casting targets are used, the chemical composition of which is Ni-8Co-7Cr-10Al-2.5Re-6Ta-0.1Hf-0.2Y (wt.%), and ground into a flat plate with a size of 380×128×8 mm. The target is installed on a magnetron sputtering apparatus, and a coating is prepared on the surface of the blade of the single crystal nickel-based superalloy René N5, and the thickness of the coating is 30-35 μm. The chemical composition of the coating was measured by EPMA: 9.1wt.% Co, 7.9wt.% Cr, 10.4wt.% Al, 2.0wt.% Re, 5.6wt.% Ta, 0.1wt.% Hf, 0.2wt.% Y, 64.7 wt.% Ni.
[0024] Such as figure 1 , using XRD to analyze the phase composition of the coating, it can be seen that the main crystal phase of the coating is γ'-Ni 3 Al. Subsequently, the γ' phase coating sample of the present invention, the comparative NiCrAlY coating sample and the René N5 substrate sample were subjected to a cyclic oxidation test at 1050° C.×500 h. The result is as figure 2 It can be seen from the obser...
Embodiment 2
[0026] Vacuum smelting casting target material, its chemical composition is Ni-9Co-6Cr-12Al-2W-2Mo-4Ta-0.05Hf-0.3Y (wt.%), processed into a flat plate with a size of 380×128×8mm. The target was installed on the magnetron sputtering apparatus, and the blade prepared by the second-generation single crystal superalloy René N5 was used as the substrate. After the substrate was cleaned, it was loaded into a vacuum chamber to prepare the coating. After the coating was deposited, the as-prepared samples were taken out after the temperature of the vacuum chamber dropped to room temperature, and then placed in a vacuum annealing furnace for annealing at 1050 °C for 1 h. According to EDS energy spectrum analysis, the chemical composition of the coating is: 9.8wt.% Co, 6.4wt.% Cr, 11.2wt.% Al, 1.7wt.% W, 1.6wt.% Mo, 3.6wt.% Ta, 0.1wt .%Y, 65.6wt.%Ni. Wherein the Hf content is too low to be detected.
[0027] Using XRD to analyze the phase composition of the coating, the main crystal ph...
Embodiment 3
[0029] Vacuum melting casting target, its chemical composition is Ni-7Co-8.5Cr-10Al-2.5Re-4.5W-0.5Mo-6.5Ta-0.2Hf-0.1Y (wt.%), processed into a size of Φ100mm×40mm Cylindrical targets. The blade prepared by the second-generation single crystal superalloy CMSX-4 is used as the substrate, and the substrate is loaded into a vacuum chamber after surface cleaning. The coating was deposited using multi-arc ion plating technology, and the specific parameters were as follows: vacuum chamber temperature 200°C, argon gas pressure 0.1Pa, arc current 70A, DC bias voltage -50V, duty cycle 20%. After the coating was deposited, the as-prepared samples were taken out after the temperature of the vacuum chamber dropped to room temperature, and then placed in a vacuum annealing furnace for 2 hours at 600°C and 1 hour at 1050°C.
[0030] In this embodiment, the coating thickness is 35-40 μm. According to EDS energy spectrum analysis, the chemical composition of the coating is: 7.2wt.% Co, 8.3wt...
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