A metal-based high-temperature insulating layer and its preparation method
A high-temperature insulation, metal-based technology, applied in metal layered products, metal material coating processes, chemical instruments and methods, etc. Stress increase and other problems, to reduce the possibility of cracking and shedding, reduce leakage channels, and improve insulation performance.
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[0032] A method for preparing a metal-based high-temperature insulating layer, comprising the following steps:
[0033] A. Surface treatment of the substrate: use (length×width×thickness) 30×95×5 nickel (Ni)-based alloy as the substrate. Scratch; Then use acetone, ethanol and deionized water to clean the surface of the substrate in turn, and dry it with nitrogen after cleaning for later use;
[0034] B. Preparation of NiCrAlY alloy transition layer: place the cleaned Ni-based alloy substrate in a vacuum of 5×10 -3 In Pa vacuum (i.e. background vacuum) environment, NiCrAlY alloy is used as the target material, and argon gas with a purity of 99.99% (volume percentage) is introduced as the sputtering medium. Air pressure) is under the condition of 0.35Pa, adopts the method for DC magnetron sputtering to deposit a 12 μ m thick NiCrAlY alloy transition layer on the Ni-based alloy substrate;
[0035] C.α-Al 2 o 3 Layer preparation: the composite substrate obtained in step B was ...
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