Corrosion-resistant high-heat-insulation low-emissivity zirconium oxide-based thermal barrier coating and preparation method thereof
A thermal barrier coating, zirconia-based technology, applied in the coating, metal material coating process, sputtering plating, etc., can solve the problems of accelerated material degradation, unstable structure, harsh service conditions, etc., to achieve strong The effect of thermal protection
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Embodiment 1
[0052] (1) Select Φ24.9mm high-temperature alloy Inconel718 rods, prepare alloy test pieces with a thickness of 6mm on a precision wire-cutting machine tool, completely submerge the high-temperature alloy substrate in an ethanol ultrasonic oscillator for 20 minutes, and use absorbent cotton to conduct a preliminary test on the surface of the high-temperature alloy. Wipe and clean, place in a vacuum drying oven at 80°C for 3 hours, then use white corundum to roughen the clean surface at 0.65Mpa pressure, and clean the surface scum with purge gas;
[0053] (1) Clamp the clean sandblasted Inconel718 superalloy substrate on a specific tooling, control the flame to preheat the test piece including the clamping tooling twice, keep the preheating temperature below 350°C, and spray it by supersonic flame spraying A NiCoCrAlYHf bonding layer with a thickness of 150 μm and a porosity of 4% was prepared on the surface of the superalloy Inconel 718 by using the above method; HVOF parameter...
Embodiment 2
[0097] (1) Except that the superalloy is changed to Incoloy825 superalloy, other steps are the same as step 1 of embodiment 1;
[0098] (2) Clamp the Incoloy825 high-temperature alloy base material in the clean sandblasting state on a specific tooling, and preheat the test piece including the clamping tooling twice by controlling the flame, keeping the preheating temperature below 360°C, and spraying it by supersonic flame A NiCoCrAlYRh bonding layer with a thickness of 100 μm and a porosity of 3% was prepared on the surface of the superalloy Incoloy825 by using the above method; HVOF parameter settings: the x-axis and y-axis spray gun speeds were 450mm / s and 200mm / s respectively, and the spray gun pitch was 5.5 mm, spray gun distance 330mm, combustion chamber pressure 72.4Pa, powder feeding 2.5rpm, oxygen and carrier gas flow rates 1500scfh and 19scfh respectively, inlet water temperature and return water temperature 43.1°C and 70°C;
[0099] (3) Replace the Incoloy825 supera...
Embodiment 3
[0109] (1) A bonding layer with a thickness of 200 μm and a porosity of 5% NiCoCrAlYRu was prepared on the surface of superalloy Monel400 by supersonic flame spraying; during the preparation process, the workpiece was preheated twice in the early stage, and the maximum temperature of the workpiece was 360 °C. Parameter settings: x-axis and y-axis spray gun speeds are 700mm / s and 400mm / s respectively, spray gun step distance is 9.5mm, spray gun distance is 350mm, combustion chamber pressure is 84.5Pa, powder feeding is 5.5rpm, oxygen and carrier gas flow rates are 1695scfh and 19.5scfh, the inlet water temperature and return water temperature are 56.6℃ and 94℃ respectively;
[0110] (2) The surface of the bonding layer is prepared by atmospheric plasma spraying with a thickness of 100 μm, a porosity of 10%, and Gd(Ta 0.5 Nb 0.5 )O 4 Oxygen barrier cooling layer; first use Gd 2 o 3 , Nb 2 o 5 and Ta 2 o 5 Spherical Gd (Ta 0.5 Nb 0.5 )O 4 Spherical powder, preheated on...
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