Method for preparing alloy-ceramic lamellar coating through atmospheric plasma spraying
An alloy ceramic and plasma technology, which is applied in metal material coating process, coating, melting spray plating, etc., can solve the problems that powder cannot be fully mixed, cannot be mass-produced, destroy original powder, etc., and achieve high temperature corrosion resistance. Excellent, the effect of improving high temperature wear resistance and corrosion resistance, high fracture toughness
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Embodiment 1
[0046] 1. Use acetone to ultrasonically clean the surface of the substrate to be sprayed, and then place it in an oven at 80-100°C for 2 hours.
[0047] 2. Use brown corundum with a particle size of 20 mesh to carry out sandblasting roughening treatment on the surface of the substrate to be sprayed, so that many tiny pits appear on the surface of the substrate, and the surface roughness of the roughened substrate is not lower than Ra7.0.
[0048] 3. Weigh 2000 g of NiCrBSi powder with a particle size range of -75~+40 μm, and the weight percentage of each component is: 15~20% chromium, 3~4.5% boron, 3.5~5.5% silicon, and 0.5~1.1% carbon , iron <5%, and the balance is nickel. 2000 g of YSZ powder with a particle size ranging from -53 to +15 μm was placed in an oven at 80 to 100 °C for 2 h to ensure good fluidity of the powder during the spraying process.
[0049] 4. The alloy powder and ceramic powder are fed into the plasma arc at the same time by means of two-way powder feedi...
Embodiment 2
[0056] The difference between this embodiment and Embodiment 1 is that in step 5, the powder feeding rate of the metal powder feeder 1 is 29.8 g / min, and the powder feeding amount of the ceramic powder feeder 2 is 3.4 g / min. Adjust the plasma spraying process current to 517 A, voltage to 58 V, flow of plasma generating gas Ar to 50 L / min, H 2 The flow rate is 8 L / min, the spraying distance is 120 mm, the gun translation speed is 300 mm / s, the gun translation distance is 3 mm, the number of spraying repetitions is 5, and the cooling method is 0.3 Mpa air cooling.
[0057] Hardness test was done on the prepared NiCrBSi-YSZ coating, coating hardness HV 0.1 The Vickers hardness can reach 742.
[0058] The reciprocating friction and wear test was carried out on the prepared coating, in which the load was 20 N, the frequency was 4 Hz, the wear scar length was 8 mm, the duration was 1 h, and the total sliding distance was 72 m. The wear rate of the sprayed NiCrBSi-YSZ coating was 4....
Embodiment 3
[0060] The difference between this embodiment and Embodiment 1 is that in step 5, the powder feeding rate of the metal powder feeder 1 is 29.8 g / min, and the powder feeding amount of the ceramic powder feeder 2 is 8.2 g / min. Adjust the plasma spraying process current to 517 A, voltage to 58 V, flow of plasma generating gas Ar to 50 L / min, H 2 The flow rate is 8 L / min, the spraying distance is 120 mm, the gun translation speed is 300 mm / s, the gun translation distance is 3 mm, the number of spraying repetitions is 5, and the cooling method is 0.3 Mpa air cooling.
[0061] Hardness test was done on the prepared NiCrBSi-YSZ coating, coating hardness HV 0.1 The Vickers hardness can reach 754.
[0062] The reciprocating friction and wear test was carried out on the prepared coating, in which the load was 20 N, the frequency was 4 Hz, the wear scar length was 8 mm, the duration was 1 h, and the total sliding distance was 72 m. The wear rate of the sprayed NiCrBSi-YSZ coating was 4....
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