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Laser Titanium Infiltration Technology of Valve Core Sealing Surface of Steam Pipe High and High Pressure Valves

A steam pipe and sealing surface technology, which is applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problems of reduced sealing performance, short service life, easy corrosion, etc., and achieve reduced deformation and long service life , the effect of stabilizing surface properties

Active Publication Date: 2015-08-19
NINGBO FUSHIDA ELECTRIC ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a laser titanium infiltration process for the sealing surface of the valve core of the steam pipeline high and medium pressure valve, so as to solve the problem that the valve core is easy to corrode in the environment of high temperature, high pressure and corrosive fluid medium contact, resulting in reduced sealing performance and short service life problem, the process of the present invention is simple, low in cost and high in efficiency, and the valve core sealing surface after treatment has excellent cavitation resistance and high temperature corrosion resistance, and has a long service life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Heat the sealing surface of the valve core to 450°C in an oxidation furnace, keep it warm for 50 minutes, pickle it in 8% hydrochloric acid for 20 seconds to remove the oxidation film after cooling, and dry it at 50°C after washing with water.

[0025] (2) Evenly spread a layer of powdered titanizing agent with a thickness of 1mm on the sealing surface of the valve core. The formula of the titanizing agent is as follows: 54% ferrotitanium powder (commercially available), 4% ammonium chloride, and 5% perchlorethylene , Aluminum oxide 37%.

[0026] (3) Heat the laid titanium infiltrating agent with laser for 2.5 minutes, laser irradiates the titanium infiltrating agent vertically, and the power density of the laser is controlled at 10 4 W / cm 2 .

[0027] (4) Step (3) After the laser treatment is completed, immediately wrap the insulation layer on the sealing surface of the valve core, and let it cool down to room temperature naturally. The material of the insulation...

Embodiment 2

[0029] (1) Heat the sealing surface of the valve core to 650°C in an oxidation furnace (argon atmosphere), keep it warm for 25 minutes, pickle it in hydrochloric acid with a mass concentration of 10% to remove the oxide film for 10 minutes after cooling, and dry it at 60°C after washing with water .

[0030] (2) Evenly spread a layer of powdered titanizing agent with a thickness of 1.5mm on the surface of the sealing surface of the valve core. The formula of the titanizing agent is as follows: 45% ferrotitanium powder, 6% ammonium chloride, 5% perchlorethylene, oxidized Aluminum 44%.

[0031] (3) Heat the laid titanium infiltrating agent with a laser for 2 minutes, the laser irradiates the titanium infiltrating agent vertically, and the power density of the laser is controlled at 10 6 W / cm 2 .

[0032] (4) Step (3) After the laser treatment is completed, immediately wrap the insulation layer on the sealing surface of the valve core, and let it cool down to room temperature ...

Embodiment 3

[0034] (1) Heat the sealing surface of the valve core to 500°C in an oxidation furnace, keep it warm for 30 minutes, pickle it in 9% hydrochloric acid for 15 seconds to remove the oxidation film after cooling, and dry it at 55°C after washing with water.

[0035] (2) Evenly lay a layer of powdered titanium infiltration agent with a thickness of 1.2mm on the surface of the valve core sealing surface after surface treatment. The formula of the titanium infiltration agent is as follows: 50% titanium iron powder, 5% ammonium chloride, perchlorethylene 3%, alumina 42%.

[0036] (3) Heat the laid titanium infiltrating agent with laser for 1.2min, laser irradiates the titanium infiltrating agent vertically, and the power density of the laser is controlled at 10 6 W / cm 2 .

[0037] (4) Step (3) After the laser treatment is completed, immediately wrap the insulation layer on the sealing surface of the valve core, and let it cool down to room temperature naturally. The material of the...

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Abstract

The present invention discloses a laser titanizing process for a valve core sealing surface of a steam pipeline high-medium pressure valve. In the prior art, a valve core easily corrodes at a high temperature under a high pressure in a corrosive fluid medium contact environment so as to cause reduced sealing performance and short service life. A purpose of the present invention is to solve the problems in the prior art. The process comprises the following main steps: (1) carrying out a surface treatment on a valve core sealing surface, (2) uniformly paving a layer of a powdery titanizing agent on the surface treated valve core sealing surface, wherein a thickness is 1-1.5 mm, (3) adopting laser to heat the paved titanizing agent for 1.2-2.5 min, wherein a laser power density is controlled to 104-106 W / cm<2>, and (4) after completing the laser treatment in the step (3), immediately wrapping a thermal insulation layer on the valve core sealing surface, and naturally cooling to a room temperature. The process has characteristics of simpleness, low cost and high efficiency. The treated valve core sealing surface has characteristics of excellent cavitation erosion resistance, high temperature corrosion resistance and long service life.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to a laser titanium infiltration process on the sealing surface of a valve core of a high-medium pressure valve in a steam pipeline. Background technique [0002] High and medium pressure valves in the power industry are widely used. The valve core is a valve part that uses its movement to realize the basic functions of direction control, pressure control or flow control. Since the sealing surface of the valve core is directly in contact with high temperature, high pressure and corrosive fluid medium, the working environment is harsh, so its sealing performance and service life are greatly affected. [0003] Titanium infiltration is a newly developed chemical heat treatment process. The corrosion resistance and wear resistance of steel and alloys after titanium infiltration increase by several times or dozens of times. Therefore, it has received the attention of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C10/30C23C10/60
Inventor 朱明程陈朝阳
Owner NINGBO FUSHIDA ELECTRIC ENG
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