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Method for preparing metal polyporous material core for accurate controlling of baffling and micro-flow quantity

A metal porous and precise control technology, which is applied in the field of preparation of metal porous material cores, can solve the problems of low precision and unsatisfactory, and achieve the effect of improving service life and reliability and simple process

Active Publication Date: 2008-01-30
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the currently used structures are bare structures, without integral peripheral sealing devices, and have low precision, which cannot meet the requirements of high performance, high reliability, and long life in harsh working environments with alternating high and low temperatures and vibration and shock.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Preparation of stainless steel micro-flow control core: select stainless steel powder with a suitable particle size within the range of -80 to -400 mesh, directly pack it into a dense stainless steel tube, and mold it at 2.5 to 5.0 MPa, and use pressure sintering at a pressure of 2 to 5 MPa. 15KPa, vacuum sintering at 1000-1250°C for 1-2 hours. The prepared stainless steel micro-flow control core body is sealed airtight between the porous inner core and the dense outer shell, and the porosity is 25-40%. When the test pressure is 0.18-0.2MPa, the gas flow is adjustable in the range of 100-800Sccm.

Embodiment 2

[0012] Preparation of titanium micro-flow control core: select titanium powder with a suitable particle size within the range of -80 to -500 mesh, directly pack it into a dense titanium tube, and mold it at 2.5 to 5.0 MPa, using pressure sintering at a pressure of 2 to 15KPa, vacuum sintering at 800-1100°C for 1-2 hours. The prepared titanium micro-flow control core body has airtight sealing between the porous inner core and the dense outer shell, and the porosity is 10-40%. When the test pressure is 0.18-0.2MPa, the gas flow rate is adjustable in the range of 10-500Sccm.

Embodiment 3

[0014] Preparation of nickel micro-flow control core: select nickel powder with a suitable particle size within the range of -80 to -400 mesh, directly pack it into a dense nickel tube, and press molding at 2.5 to 5.0 MPa, using pressure sintering method, the pressure is 2 to 15KPa, vacuum sintering at 1100-1300°C for 1-2 hours. The prepared nickel micro-flow control core body is sealed and airtight between the porous inner core and the dense outer shell, and the porosity is 20-40%. When the test pressure is 0.18-0.2MPa, the gas flow rate is adjustable within the range of 100-600Sccm.

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PUM

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Abstract

The invention discloses a preparation method of a metal porous material core body for a throttle and slight flux precise control. The method is that the metal powder with the granularity ranging from minus 80 grids to minus 500 grids is directly positioned into a compact pipe for compression molding with the forming pressure ranging from 2.5 MPa to 5.0 MPa; after that, the pressurization and burning method is adopted on the condition of pressure ranging from 2 KPa to 15 KPa and the temperature ranging from 600 DEG C to 1300 DEG C for vacuum burning to obtain the metal porous material slight flux control core body with the porosity ranging from 10 percent to 40 percent; the internal core is the porous material and the shell is the compact material. The invention has simple process, and the porosity of the prepared porous material is different with the changes of the granularity, pressing pressure and the burning temperature of the original powder, thus adjusting the flux changes of the slight flux controller and reaching different throttle effects; when the test pressure ranges from 0.18 MPa to 0.2 MPa, the gas flux is adjustable in the range ranging from 1.0 Sccm to 800 Sccm, and the service life of the throttleer is prolonged and the reliability of the throttleer is improved.

Description

technical field [0001] The invention relates to a method for preparing a metal porous material core body for precise control of throttling and micro-flow. Background technique [0002] International companies that produce micro-flow controllers mainly include MOTT and GKN, and the flow control range is 28300cm 3 / min~1×10 -6 cm 3 / min, pressure difference up to 10.2MPa, materials include 316L stainless steel, Inconel, Monel, Hastelloy, nickel, etc. [0003] At present, domestic porous materials are generally used in filtration and separation, but are rarely used in flow-limiting micro-flow controllers. Most of the cores of domestic flow restrictors are traditional throttling bodies (capillary tubes, round tubes, microporous valves, etc.), which have low precision in controlling flow and large flow fluctuations. In recent years, with the improvement of micro-flow control requirements, the traditional throttling body can no longer meet the requirements, and the porous mate...

Claims

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Application Information

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IPC IPC(8): B22F3/16C22C1/08
Inventor 汤慧萍谈萍康小录康新婷余水林汪强兵李程朱纪磊廖际常
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH