Highly corrosion-resistant, wear-resistant and anti-fouling coating for flue gas turbine blades and its preparation process
A flue gas turbine and anti-scaling coating technology, which is applied in the direction of metal material coating technology, coating, melt spraying, etc., can solve the problems of spraying composite coatings, achieve good corrosion resistance, improve stability, and improve The effect of service life
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Embodiment 1
[0028] After the blade is clamped by the tooling, first fix the blade with sandblasting tooling, use 16 mesh and 24 mesh mixed brown corundum with a ratio of 3:1 for sandblasting, the pressure is 0.7MPa, the spray angle is 90°, and the sandblasting distance is 0.15m ; The material composition of the cermet coating is NiCr 25%, Cr 3 C 2 75% mixed powder, the preparation process is air pressure 0.8MPa, propane pressure 0.7MPa, powder feeding speed 20g / min, spraying distance 200mm, spraying angle 90°, spraying speed 500mm / s, step distance 3mm, substrate temperature less than 150 ℃; then the composition of the material used for spraying the ceramic coating is Al 2 o 3 87%, TiO 213%, the preparation process is spraying voltage 50V, current 700A, main gas pressure 0.6MPa, main gas flow 60L / min, auxiliary gas pressure 0.5MPa, auxiliary gas flow 6L / min, carrier gas flow 5L / min, powder feeding speed 40g / min, the spraying distance is 100mm, the spraying angle is 90°, the spraying s...
Embodiment 2
[0030] After the blade is clamped by the tooling, first fix the blade with sandblasting tooling, use 16 mesh and 24 mesh mixed brown corundum with a ratio of 3:1 for sandblasting, the pressure is 0.7MPa, the spray angle is 90°, and the sandblasting distance is 0.15m ; The material composition of the cermet coating is NiCr40%, Cr 3 C 2 60% mixed powder, the preparation process is air pressure 0.7MPa, propane pressure 0.55MPa, powder feeding speed 20g / min, spraying distance 200mm, spraying angle 90°, spraying speed 500mm / s, step distance 3mm, substrate temperature less than 150 ℃; then the composition of the material used for spraying the ceramic coating is Al 2 o 3 92%, TiO 2 8%, the preparation process is spraying voltage 55V, current 650A, main gas pressure 0.6MPa, main gas flow 60L / min, auxiliary gas pressure 0.5MPa, auxiliary gas flow 6L / min, carrier gas flow 5L / min, powder feeding speed 40g / min, the spraying distance is 100mm, the spraying angle is 90°, the spraying s...
Embodiment 3
[0032] A high-corrosion-resistant, wear-resistant, and anti-scaling coating for flue gas turbine blades is composed of a 0.1mm-thick chromium carbide cermet coating on the inner layer and a 0.1mm-thick alumina-titanium oxide ceramic coating on the outer layer. The chemical composition and mass percentage content of the chromium carbide cermet coating are: NiCr alloy 25%, Cr 3 C 2 Ceramic 75%; the chemical composition and mass percentage content of alumina titanium oxide ceramic coating are: Al 2 o 3 60%, TiO 2 40%.
[0033] The preparation process of the high-corrosion-resistant, wear-resistant and anti-fouling coating for the flue gas turbine blade is characterized in that it comprises the following steps:
[0034] (1) Surface cleaning: first use acetone and then use absolute ethanol to manually clean the blade surface to remove oil and ensure the cleanliness of the flue gas turbine blade surface;
[0035] (2) Shielding protection: Use blade spraying tooling to shield ...
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