Thermal barrier coating for gas turbine blades and preparation method of coating
A technology of thermal barrier coatings and turbine blades, applied in coatings, metal material coating processes, fusion spraying, etc., to achieve compact structure, improve overall performance, and reduce production costs
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[0021] Example 1
[0022] The thermal barrier coating is prepared using the superalloy base material of the gas turbine first-stage turbine blade as the carrier. The process flow is: incoming inspection → acetone degreasing → visual inspection → dry sand blowing → cleaning → fixture protection → clamping → preheating → super Sonic spraying MCrAlY dense layer → supersonic spraying MCrAlY rough layer → heat treatment → plasma spraying YSZ surface layer → inspection.
[0023] Dry sand blowing treatment before spraying is to clean and activate the alloy surface of the parts, thereby improving the bonding strength between the MCrAlY bottom layer and the alloy matrix.
[0024] The coating preparation steps are:
[0025] 1) Supersonic spraying MCrAlY (M=Ni) dense layer with a thickness of 0.13mm, and the particle size of MCrAlY powder used for spraying is -88+16μm;
[0026] 2) Supersonic spraying MCrAlY (M=Ni) rough layer with a thickness of 0.07mm, the particle size of MCrAlY powder used for...
Example Embodiment
[0030] Example 2
[0031] The difference from Example 1 is:
[0032] The thickness of the dense layer of supersonic spraying MCrAlY (M=Ni+Co) is 0.09mm; the thickness of the rough layer of supersonic spraying MCrAlY (M=Ni+Co) is 0.05mm; the surface roughness Ra of the rough layer after spraying is 12μm; plasma spraying The thickness of the YSZ surface layer is 0.35mm. The thermal barrier coating has the advantages of good oxidation and corrosion resistance and high interface bonding strength.
Example Embodiment
[0033] Example 3
[0034] The difference from Example 1 is:
[0035] The thickness of the dense layer of supersonic spraying MCrAlY (M=Co) is 0.15mm; the thickness of the rough layer of supersonic spraying MCrAlY (M=Co) is 0.06mm; the surface roughness Ra of the rough layer after spraying is greater than 10μm; the thickness of the plasma spraying YSZ surface layer It is 0.45mm. The thermal barrier coating has the advantages of good oxidation and corrosion resistance and high interface bonding strength.
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