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Metal porous membrane tube and preparation method thereof

A metal porous, membrane tube technology, applied in separation methods, chemical instruments and methods, membrane technology, etc., can solve the problems of reducing membrane tube permeability, unsynchronized sintering shrinkage, etc., to overcome sintering peeling, precision control layer Uniform and large penetration effect

Inactive Publication Date: 2009-05-20
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the membrane tube is removed from the dense tube after the inner wall of the dense tube is formed once, and the thickness is 1-5mm. If it is too thin, the blank cannot come out. If it is too thick, the sintering shrinkage of the inner and outer walls of the tube cannot be synchronized or the permeability of the membrane tube will be reduced.

Method used

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  • Metal porous membrane tube and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 80g of stainless steel powder with a particle size of 2.7μm, and prepare a powder suspension slurry with a pore size of 25μm and an air permeability of 130m 3 / (m 2 .h.Kpa) The outer wall of the porous support tube is covered with plastic, one end is sealed, the prepared slurry is loaded into the porous metal support tube from the other end, and then the other end of the porous support is sealed and fixed in the centrifugal cylinder. Start the centrifugal deposition device, and adjust the rotation speed from 0 to 6000 rpm for 300 minutes. The prepared stainless steel film, its microstructure is as follows figure 1 As shown, the average pore size of the medium flow in the precision control layer is 4.2 μm using the PMI capillary flow analyzer, and the relative air permeability of the filter tube is 100 m using the FBP-3I porous material tester. 3 / (m 2 .h.Kpa), the film thickness observed by scanning electron microscope is 100μm.

Embodiment 2

[0025] The steps are the same as in Example 1, the aperture of the porous stainless steel support tube is 25 μm, and the air permeability is 130 m 3 / (m 2 .h.Kpa), weighing 40g of 2.7μm stainless steel powder, preparing stainless steel slurry, the porous stainless steel membrane tube produced, using the PMI capillary flow analyzer to test the average pore size of the precision control layer is 4.7μm, using FBP-3I porous The relative air permeability coefficient of the filter tube tested by the material tester is 120m 3 / (m 2 .h.Kpa), the film thickness observed by scanning electron microscope is 50μm.

Embodiment 3

[0027] The steps are the same as in Example 1, the aperture of the porous support titanium tube is 15 μm, and the air permeability is 70 m 3 / (m 2 .h.Kpa), weighing -500 mesh titanium powder 40g, preparing titanium powder slurry, the prepared titanium porous membrane tube, using PMI capillary flow analyzer to test the average pore size of the precision control layer is 0.7 μm, using FBP-3I The relative air permeability coefficient of the filter tube tested by the type porous material tester is 70m 3 / (m 2 .h.Kpa), the film thickness observed by scanning electron microscope is 100μm.

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Abstract

The invention provides a metallic porous membrane tube and a method for preparing the same. A pore precision control layer is attached on the inner wall of a porous metallic supporting tube with a larger pore size, wherein the thickness of the precision control layer is smaller than 500 mu m and the pore size thereof is smaller than 10 mu m. The preparation process is as follows: mixing powder and a dispersant to prepare a slurry; using plastic to coat the outer wall of the supporting tube, sealing one end of the supporting tube, filling the prepared slurry into the porous metallic supporting tube from the other end and sealing the other end of the porous supporting tube, and fixing the porous supporting tube in a centrifugal cylinder; and starting a centrifugal graded putting-down machine, taking out the porous supporting tube with a pore layer from the centrifugal cylinder, and drying and sintering the porous supporting tube to obtain the finished product membrane tube. The metallic porous membrane tube can achieve high filtering precision and large transmission simultaneously; and the preparation method is simple and can avoid the cracks, peelings or local shedding and the like of the precision control layer after the tube is sintered.

Description

technical field [0001] The invention relates to a metal porous tube and a preparation method thereof, in particular to a metal porous membrane tube used for filtration, separation, fluid distribution, mass transfer and heat transfer in the fields of petroleum, chemical industry, energy, environmental protection, food, pharmacy, etc. its preparation method. Background technique [0002] Metal porous material is a kind of metal material with obvious pore characteristics (porosity up to 98%). Due to the existence of pores, it presents a series of special functions different from metal dense materials. It is widely used in metallurgical machinery, petrochemical industry Filtration and separation, fluid penetration and distribution control, fluidization, high-efficiency combustion, enhanced mass transfer and heat transfer, flame retardant and explosion-proof in industrial processes such as energy and environmental protection, national defense and military industry, nuclear techno...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D69/04B01D69/10B01D39/20B22F3/11B22F3/22B22F5/12
Inventor 汤慧萍奚正平汪强兵王建永杨保军李增峰
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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