Producing method of polycrystalline diamond complex valve base of pressure reducing valve

A technology of polycrystalline diamond and manufacturing method, which is applied in the field of preparation of wear-resistant and anti-erosion pressure reducing valve seat composite materials, can solve the problems of valve core wear and failure, achieve improved wear resistance, promote bonding, The effect of curbing abnormal growth

Inactive Publication Date: 2009-09-09
SHANGHAI RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The spool and seat of the American FLOWSERER control valve are all made of integral tungsten carbide. After only dozens of hours of use under the process conditions of high temperature, high pressure difference, and solid particle materials, the spool becomes severely worn and fails.

Method used

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  • Producing method of polycrystalline diamond complex valve base of pressure reducing valve
  • Producing method of polycrystalline diamond complex valve base of pressure reducing valve
  • Producing method of polycrystalline diamond complex valve base of pressure reducing valve

Examples

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Effect test

Embodiment 1

[0031] The diamond powder is a diamond micropowder with a complete crystal form, and its particle size ratio is W20:W10:W5=75:20:5. Before sintering, firstly weigh the raw diamond powder and carry out vacuum treatment to remove the suspended gas adsorbed on the surface of the diamond powder. The vacuum purification treatment conditions are: (1~3)×10 -3 Pa, 600°C, vacuum purification for 1h. Add 1-5wt% Fe powder and Si powder as sintering aids to the purified diamond micropowder, mix well, and pack the cemented carbide YG20 processed into a cylindrical structure into a metal molybdenum cup, tungsten (W)-cobalt ( Co)-like cemented carbide matrix structure such as figure 1 As shown, the cylinder 1 is filled with diamond mixture, and then assembled in the pyrophyllite cavity. Place the assembled pyrophyllite cavity on the domestic six-sided top ultra-high pressure and high temperature equipment, adopt the sintering process of first increasing the pressure to 6.0GPa and then incr...

Embodiment 2

[0034] The diamond powder is a diamond micropowder with a complete crystal form, and its particle size ratio is W20:W10:W5=75:20:5. Before sintering, firstly weigh the raw diamond powder and carry out vacuum treatment to remove the suspended gas adsorbed on the surface of the diamond powder. The vacuum purification treatment conditions are: (1~3)×10 -3Pa, 600°C, vacuum purification for 1h. Add 1-5wt% Fe powder and Si powder as sintering aids to the purified diamond micropowder, mix evenly, put the hard alloy YG20 processed into a cylindrical structure into a metal molybdenum cup, and then put the cylinder 1 The inside and one end face are filled with diamond mixture, and then assembled in the pyrophyllite cavity. Place the assembled pyrophyllite cavity on the domestic six-sided top ultra-high pressure and high temperature equipment, adopt the sintering process of first increasing the pressure (6.0GPa) and then increasing the temperature. When the temperature rises to 1450°C, ...

Embodiment 3

[0038] A method for manufacturing a valve seat of a polycrystalline diamond composite pressure reducing valve, using tungsten (W)-cobalt (Co) hard alloy YG11 as a substrate, filling and mixing 1wt% sintering aids Fe powder and Si on the substrate powdered diamond powder. The purpose of adding sintering aid is to fully consider the difference in expansion coefficient between cemented carbide and diamond, to reduce the existence of liquid phase during PCD sintering as much as possible, to curb the abnormal growth of grains, and to avoid the sintering between the two after cooling. Cracks occur at the interface, reducing the service life of the valve seat. Diamond powder is a diamond powder with complete crystal form, and its particle size ratio is W20:W10:W5=70:25:5. Before sintering, first weigh the raw diamond powder with a good ratio, put it into a vacuum purification device, and purify it. treatment to remove the suspended gas adsorbed on the surface of the diamond micropow...

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Abstract

The invention relates to a producing method of a polycrystalline diamond complex valve base of a pressure reducing valve, which is as follows: polycrystalline diamond complex (PDC) is formed by the high-pressure, high-temperature and original-site sintering of diamond powder on an basal body made of wolfram (W)-cobalt (Co) hard alloy, and the valve base made of the polycrystalline diamond complex is made by specific processing technology. Compared with the prior art, the polycrystalline diamond complex valve base of a pressure reducing valve has abrasion resistance, flushing-corrosion resistance and long service life, and in particular solves the bottleneck problem limiting the long-period and stable running of the producing device.

Description

technical field [0001] The invention relates to a method for manufacturing a valve seat of a polycrystalline diamond composite pressure reducing valve, in particular to a wear-resistant and anti-erosion valve used in petroleum, chemical, coal chemical and other working conditions such as high temperature, high pressure difference, and containing solid particles. A preparation method of a valve seat composite material for a pressure reducing valve. Background technique [0002] Polycrystalline diamond composite (Polycrystalline Diamond Composite, PDC) or polycrystalline diamond (Polycrystalline Diamond, PCD) as a superhard, wear-resistant composite material in oil drilling, geological exploration drill bits and machining fields of cutting tools, It has been widely used in drawing touches, trimmers and other various wear-resistant devices. Early PDC products are mainly represented by Compax in situ sintered by American G.E Company and Sydite by British DeBeers Company with in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F7/04B22F5/10
Inventor 彭东辉刘阿龙孙方红章序文梁海波兰建华陈奕峰吴向阳张丽雅
Owner SHANGHAI RES INST OF CHEM IND
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