Hard-seal ball valve with high wear resistance and corrosion resistance and preparation method

A kind of hard sealing, high wear resistance technology, applied in the field of metal surface engineering, can solve the problems of high temperature resistance sealing layer, easy to be damaged, affecting the compactness of the coating, etc., to achieve excellent corrosion resistance, excellent corrosion resistance, The effect of a low coefficient of friction

Inactive Publication Date: 2018-06-08
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the particle size of the sprayed powder directly affects the compactness of the coating. There is a porosity of 1% to 2% on the surface of the sprayed coating, which limits the wear resistance and corrosion resistance of the sprayed coating to a certain extent. The commonly used sprayed coating sealing agent such as SiO 2 、Al 2 o 3 , CrO 3 Although the composite sealing agent has a good sealing effect, the organic or inorganic sealing agent has the disadvantages of not being able to withstand high temperature and the sealing layer is thin when used, and it is easily damaged in an abrasive environment. Conventional sealing agents are suitable for ball valves. The sealing effect of the spray coating still has limitations in use

Method used

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  • Hard-seal ball valve with high wear resistance and corrosion resistance and preparation method

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Embodiment 1

[0025]Example 1: Put the polished stainless steel ball and valve seat in an ultrasonic cleaning machine, first remove oil and wax in acetone at 25°C, and then remove residual acetone in alcohol at 25°C, and finally use the water temperature as Wash with deionized water at 20-30°C, dehydrate and then dry. Then, the ball and the valve seat are sandblasted, and the sandblasting material is brown corundum sand. Use a spray gun to spray the ball and valve seat after sandblasting. The spray powder is WC-12Co, the spray distance is 330mm, the flow rate of oxygen is 50L / h, and the flow rate of kerosene is 30L / h. Grind and polish the sprayed layer with No. 120-1200 sandpaper in sequence to a roughness of Ra0.5 μm, then place it in an ultrasonic cleaner, clean it in alcohol at 25° C., and then dry it. Fix the dried ball and valve seat on the inner turret of the vacuum ion coating machine, and vacuumize to 3.0×10 -4 After Pa, start the turret to make the rotation speed 3r / min until the...

Embodiment 2

[0026] Example 2: Put the polished carbon steel ball and valve seat in an ultrasonic cleaning machine, first remove oil and wax in acetone at 25°C, then remove residual acetone in alcohol at 25°C, and finally use water temperature Wash with deionized water at 20-30°C, dehydrate and then dry. Then, the ball and the valve seat are sandblasted, and the sandblasting material is brown corundum sand. Use a spray gun to spray the ball and valve seat after sandblasting, and the spray powder is Cr 3 C 2 -NiCr, the spraying distance is 380mm, the flow rate of oxygen is 60L / h, and the flow rate of kerosene is 30L / h. Use No. 120-1200 sandpaper to polish the surface of the sprayed coating in sequence, then place it in an ultrasonic cleaner, wash it in alcohol at 25°C, and then dry it. Fix the dried ball and valve seat on the inner turret of the vacuum ion coating machine, and vacuumize to 3.0×10 -4 After Pa, start the turret to make the rotation speed 3r / min until the coating is finish...

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Abstract

The invention discloses a hard-seal ball valve with high wear resistance and corrosion resistance and a preparation method of the hard-seal ball valve with high wear resistance and corrosion resistance and belongs to the technical field of metal surface engineering. The hard-seal ball valve comprises a steel ball valve base body. A carbide cermet coating of the hundreds-of-micron order and a nitride ceramic coating of the micro-nano order are sequentially synthesized on the steel ball valve base body, and the carbide cermet coating is a WC-Co-based or high-temperature-resistant Cr3C2-NiCr-based coating. The nitride ceramic coating is a dense Cr, Ti, AlCr or other binary or polybasic nitride multi-layer coating. The preparation method of the hard-seal ball valve comprises the steps that a metal ceramic hardened layer and a nitride multi-layer hole sealing layer are sequentially synthesized on the surface of the ball valve by the adoption of supersonic flame spraying and vacuum ion plating methods. The surface-modified hard-seal ball valve with high wear resistance and corrosion resistance has the high hardness, low friction coefficient, wear resistance, corrosion resistance and other compound properties, the surface microhardness reaches 1,800-3,000 HV, and the resistance standard salt spray test is performed for more than 240 hours, and the service life of the hard-seal ball valve is prolonged remarkably.

Description

Technical field: [0001] The invention belongs to the technical field of metal surface engineering, and in particular relates to a hard-sealed ball valve with high wear resistance and corrosion resistance and a preparation method thereof. Background technique: [0002] At present, the service life of hard-sealed ball valves is generally short, and its main failure forms are wear, erosion, cavitation, oxidation and corrosion. For the petrochemical industry, the intrusion of tiny hard particles in the fluid into the sealing surface is likely to produce a plowing effect, resulting in scratches, pad damage and abrasive wear on the sealing surface, while corrosive media will accelerate failure. The harsh working environment puts forward higher requirements on the wear resistance and corrosion resistance of the ball and valve seat of the ball valve, especially the gas-solid, liquid-solid or three-phase mixed medium wears the sealing surface of the ball valve very seriously, which c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/00C23C4/129C23C4/06C23C14/32C23C14/06
CPCC23C4/06C23C4/129C23C14/0021C23C14/0641C23C14/325C23C28/324C23C28/34
Inventor 张世宏胡凯张林蔡飞吴朝军
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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