Thermal spraying applications
日期：2017-08-23 20:56:14
1.200m³ spherical tank spray repair
The tank is made of 16MnR, wall thickness of 24mm, the storage medium is H2-containing liquefied petroleum gas, the use of 5 years after the welding head area cracking. To this end in the weld and fusion zone and heat affected zone spraying copper alloy. Pretreatment in the weld and heat affected area with a grinding wheel grinding width of 150 ~ 170mm, with acetone cotton yarn scrub 2 to 3 times. Preheat the sprayed area to 250 to 350 ° C with a liquefied petroleum gas flame. Sprayed nickel clad aluminum blended powder as the bottom layer. Finally, the copper alloy working layer is sprayed, the oxygen pressure is 0.6 ~ 8MPa, the acetylene pressure is 0.05 ~ 0.1MPa, the spraying width is 120 ~ 150mm, and the spraying distance is 150 ~ 200mm. After 120 days of operation assessment, no H2S stress corrosion cracking, the effect is good.
2. Cylinder block spray repair
Cylinder block made of alloy cast iron, the main bearing hole is often due to wear and tear and failure. Before processing the main bearing hole seat for the overall processing, eliminating the oval. With the oxygen - acetylene flame to spray the site heated to 300 ~ 350 ℃, burned its surface microporous and graphite oil, first with trichlorethylene cleaning, with quartz sand surface roughening treatment in the seat surface every 2 ~ 3mm to play a triangle ocular. In the upper and lower half ring planting four height and coating thickness of the same M3 screws to improve the coating and the matrix of the binding force. Spray once again with acetone before spraying. The holes were preheated to 160-180 ° C with oxygen-acetylene flame. Spray 0.1 mm thick nickel clad aluminum base. After removing the deposit with a wire brush, the nickel-based powder working layer is sprayed. Oxygen pressure 0.6 ~ 0.8MPa, acetylene pressure 0.05 ~ 0.03MPa, spraying distance 150 ~ 200mm. The surface temperature of the coating shall not exceed 300 ° C during spraying. After spraying, the lower half of the main bearing hole is embedded in asbestos around 250 ℃ to cool to room temperature. The outer surface of the upper ring is cooled with water to avoid coating. Spray the back seat of the wear resistance and lubrication, and long life, good economic returns.
3. Atomic furnace furnace core components of the spray
The furnace core composition is made of Austenitic stainless steel small diameter pipe, diameter 110 mm, diameter 80mm, length 120mm, the use of small spray gun non-transfer type plasma automatic spraying, argon plus 8% hydrogen, current 100A, The helium was used to deliver 74Ni-13Cr-4Si-3B self-fluxing alloy powder coating material. Rotating to achieve automatic spraying, high efficiency, low cost.
4. Jet Engine Maze Ring Seal Edge Spray Repair
When the jet engine is running, it is required that the gap between the rotating part and the stationary part be kept constant. Therefore, it is required that the edge of the nickel seal sealing member has excellent abrasion resistance and heat resistance. B-747 aircraft GF6-46AZ engine labyrinth ring seal with nickel-based alloy 55.5Ni-19Cr-11Co-10Mo-3Ti-5Al production. Before spraying with fine alumina shot peening and nitric acid erosion alternately, remove the original coating, and then fine alumina shot peening. Cover the non-sprayed area with a heat-resistant tape. Using N2, H2 plasma spray 0.1mm thick working layer, the alloy powder is 94Al2O3-2.5TiO2-2.0SiO2-1.5 other. Current 500A, voltage 75V, powder flow 3kg / h. Preheat temperature 66 ~ 121 ℃, the maximum allowable temperature of 250 ℃, spraying distance of 100mm. After spraying the mask last year, with a special machine on the edge of processing.
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