Process method for plasma spray coating of ceramic coating on hydraulic turbine sealed rotation bracket
A technology of rotating bracket and process method, which is applied in the direction of pressure inorganic powder coating, etc., which can solve the problems of low surface hardness, surface wear and corrosion, and high maintenance cost of the sealing surface, so as to improve the anti-wear ability and anti-corrosion ability, and reduce surface roughness The effect of reducing the coefficient of friction
Inactive Publication Date: 2013-08-07
HARBIN ELECTRIC MASCH CO LTD
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Problems solved by technology
[0002] In the past, the sealing and rotating bracket of the water turbine was made of ordinary carbon steel as a whole, and stainless steel was surfacing on the sealing surface. The sealing surface obtained in this way has the disadvantages of low surface hardness and high surface roughness.
Due to the harsh working conditions and high impact pressure on the sealing surface, the surface is severely worn and corroded, which can easily cause water leakage and failure, resulting in a short service life and high maintenance costs.
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0005] Example 1: A plasma spraying ceramic coating process method for the sealing rotating bracket of a hydraulic turbine is carried out according to the following steps: 1. Combine the four-part workpieces, and machine the surface to be sprayed vertically to form a 0.8mm deep groove; 2. Use argon arc welding to surfacing a stainless steel material with a thickness of 1mm and a width of 4mm at the joints on both sides of each piece of work piece; 3. Combine the four pieces of work piece after edge sealing, and adjust the shape on a vertical car; 4. The surface cleanliness of the sand reaches Sa2.5 level; 5. Plasma sprayed Ni / Al composite powder with a thickness of 0.08~0.12mm; 6. Plasma sprayed with a thickness of Cr 0.3~0.5mm 2 O 3 Powder; 7. Use diamond grinding wheel to grind the sprayed surface to meet the drawing size requirements. After processing by this process method, the sealing surface hardness of the hydraulic turbine sealing rotating support is 900-1100HV, the surf...
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Abstract
The present invention discloses a process method for plasma spray coating of a ceramic coating on a hydraulic turbine sealed rotation bracket. The process method comprises: carrying out workpiece integrating, adopting a vertical lathe to process a surface to be sprayed to form a concave groove, adopting argon arc welding to carry out surfacing welding of a stainless steel material on seam combination positions on both sides of every petal of the workpiece, integrating the edge sealed-workpiece, adopting the vertical lathe to carry out shape correction, carrying out whole body sandblasting on the surface requiring spray coating so as to achieve a surface cleanliness of Sa 2.5 level, carrying out plasma spray coating of Ni-Al composite powder on the sprayed surface, carrying out plasma spray coating of Cr2O3 powder on the sprayed surface, and adopting a diamond grinding wheel to grind the sprayed surface. With the present invention, wear resistance and corrosion resistance of the sealed surface of the hydraulic turbine sealed rotation bracket can be improved so as to prolong a workpiece service life and reduce maintenance cost.
Description
Technical field [0001] The invention relates to a process method for plasma spraying ceramic coating on a sealing rotating support of a hydraulic turbine. Background technique [0002] In the past, the entire sealing rotating support of a hydraulic turbine was made of ordinary carbon steel, and the sealing surface was welded with stainless steel. The sealing surface obtained in this way had the disadvantages of low surface hardness and high surface roughness. Due to the harsh working conditions of the sealing surface and high impact pressure, the surface is severely worn and corroded, which is easy to cause water leakage and failure, resulting in a short life cycle of the workpiece and high maintenance costs. Summary of the invention [0003] The invention is a process method for plasma spraying ceramic coating of the sealing rotating support of a hydraulic turbine. This method can improve the anti-wear and anti-corrosion ability of the sealing surface of the sealing rotating supp...
Claims
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IPC IPC(8): C23C24/04
Inventor 王振凯王国强刘妍
Owner HARBIN ELECTRIC MASCH CO LTD