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Asymmetric metal filter core and preparation method thereof

A metal filter element, asymmetric technology, applied in separation methods, chemical instruments and methods, filtration and separation, etc., can solve the problems of difficulty in filter element preparation, unclear gradient structure, and few preparation methods involved, and achieve good application prospects. Long service life and excellent regeneration performance

Inactive Publication Date: 2012-06-13
ADVANCED TECHNOLOGY & MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently reported asymmetric powder filter mainly adopts the centrifugation method to make the powder form a gradient, but the gradient structure is not obvious, and it is also difficult to realize the preparation of a longer filter element, and it is difficult to prepare an asymmetric powder filter element by brushing process. and specific preparation methods are rarely involved

Method used

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  • Asymmetric metal filter core and preparation method thereof
  • Asymmetric metal filter core and preparation method thereof
  • Asymmetric metal filter core and preparation method thereof

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Experimental program
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Effect test

Embodiment approach

[0027] The structure of the asymmetric metal powder filter element formed by powder composite sintering of the present invention is as follows figure 1 As shown, the powder filter element is formed by composite sintering of a framework layer 2 with a larger pore size and higher permeability and a working layer 3 with a smaller pore size. Skeleton layer 2 is Shape, that is, one end has a tube bottom and one end is open. In addition, the open end of the framework layer 2 is welded with a connector 1 (the connector can be any one of a threaded joint, a straight pipe, a venturi or a Raoul throat), and the filter element size of the framework layer 2 is d×l ×δ=φ(30~100)×(100~2000)×(1.2~5)mm, the average pore diameter is 5~35um (according to the inventor’s experience, it can be compounded into 0.1μm based on the 5μm framework layer pores The asymmetric filter element can be compounded into a 10 μm asymmetric filter element on the basis of 35 μm pores. The composite filter element h...

Embodiment 1

[0050] The framework layer filter element is prepared by isostatic pressing process. According to the structure of the frame layer filter element, the corresponding tubular mold is designed. The 316L stainless steel metal powder raw material is sieved and graded with a particle size of -150+250 mesh; filled in the corresponding tubular mold, vibrated on the vibrating table, and then directly formed by a cold isostatic press, the forming pressure is 200MPa, and the The pressing time is 10 minutes; a vacuum high-temperature sintering furnace is used to sinter the demolded green body. The sintering temperature is 1250℃, the holding time is 2 hours, and the vacuum degree is -1 Pa. After the sintering is completed, the joint is welded, the welding current is 50A, the welding speed is 8mm / min, and the prepared framework layer filter element is φ60×1000mm.

[0051] The particle size of the working layer powder is 0.1um. Add 2% binder and 2 times diluent to the powder material of a cert...

Embodiment 2

[0053] The framework layer filter element is prepared by isostatic pressing process. According to the structure of the frame layer filter element, the corresponding tubular mold is designed. The 316L stainless steel metal powder raw material is sieved and graded with a particle size of -100+200 mesh; filled in the corresponding tubular mold, vibrated on the vibrating table, and then directly formed by a cold isostatic press, the forming pressure is 200 MPa, and the The pressing time is 10min; a vacuum high-temperature sintering furnace is used to sinter the demoulded green body, the sintering temperature is 1260℃, the holding time is 2 hours, and the vacuum degree is -1 Pa. After the sintering is completed, the joint and the tube bottom are welded, the welding current is 50A, the welding speed is 8mm / min, and the prepared framework layer filter element is φ60×1000mm.

[0054] The particle size of the working layer powder is 5um. Add 4% binder and 2 times diluent to a certain par...

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Abstract

The invention provides an asymmetric metal filter core and a preparation method thereof. The asymmetric metal filter core is prepared by carrying out composite sintering on powder and comprises a tubular skeleton layer and an operational layer. The operational layer is covered above an external surface of the skeleton layer; the metal filter core has a dimension of d*l* delta equal to phi (30-100)*(100-2000)*(1.7-5.5)mm, wherein d*l* delta respectively represent an external diameter, a length and a wall thickness of the metal filter core; the skeleton layer of the metal filter core has an average aperture of 5-35 mum; the asymmetric metal filter core has an aperture of 0.1-10 mum and an amount of porosity of 25-60%; and the aperture of the skeleton layer is 5-25 mum larger than that of the operational layer. Compared with a homogeneous filter core with a same aperture, the asymmetric powder composite filter core has advantages of high permeability, good regeneration performance and long service life, etc., applies to gas-solid separation and liquid-solid separation and has good application prospects in the fields of gas purification, petroleum chemistry and energy and environmental protection, etc.

Description

Technical field [0001] The present invention relates to a metal filter element in the field of powder metallurgy products and a preparation method thereof, in particular to an asymmetric metal filter element obtained by powder composite sintering and a preparation method thereof. The asymmetric metal filter element is widely used in the petrochemical industry, Especially as a high-precision filter element, it is widely used in dust removal, filtration or purification in the field of gas-solid and liquid-solid separation. Background technique [0002] Metal powder porous materials are a type of porous material that integrates pore functional characteristics and metal structural characteristics, and has excellent comprehensive performance. Compared with other porous materials, it has excellent properties such as stable pore shape, controllable porosity and pore size, good mechanical properties, high temperature resistance and thermal shock resistance, processability and welding. I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/20
Inventor 王凡郭辉进王浩杨军军夏海滨安永涛陈利军韩振武
Owner ADVANCED TECHNOLOGY & MATERIALS CO LTD
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