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Integral step-by-step multiple-stage heat-preserving sintering process of metal porous membrane tube

A multi-stage heat preservation and metal porous technology, which is applied in the direction of semi-permeable membrane separation, membrane technology, filtration separation, etc., can solve the problems of deformed metal porous performance, sintering cracking, poor performance, etc., and achieve simple and reasonable process steps and easy operation and control , combined with a firm effect

Active 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

At the same time, additives are generally added during the preparation of the metal film, and they must be removed during the sintering process. If the sintering method is improper, sintering cracking, deformation or poor metal porous properties often occur during the sintering process of the metal porous film. question
Usually, the connection between the metal porous pipe and the flange is connected by argon arc welding, which produces a heat-affected zone between the pipe body and the flange, forming microcracks, affecting the connection strength between the pipe body and the flange, and shortening the length of the metal porous pipe. The service life of the tube also has this problem for the metal porous membrane tube. At the same time, because the welding affects the integrity of the membrane layer, the performance of the metal membrane tube is reduced.

Method used

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  • Integral step-by-step multiple-stage heat-preserving sintering process of metal porous membrane tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] like figure 1 As shown, the overall step-by-step multi-stage heat preservation and sintering process of the metal porous membrane tube of the present invention comprises the following steps:

[0027] Step 1. Process the flange according to the inner diameter of the processed metal porous membrane tube blank, and assemble the two tightly. The metal porous membrane tube is composed of a porous support tube body and a metal film layer attached thereto , the metal film layer includes metal powder and sol dispersant and / or water. The metal porous membrane tube described in step 1 has an outer diameter of 50±5mm and an inner diameter of 44±4mm.

[0028] In this embodiment, the metal film layer is composed of stainless steel powder, polyvinyl alcohol and water, and the particle size of the stainless steel powder is -500 mesh. In addition, the outer diameter of the metal porous membrane tube is 50 mm, and the inner diameter is 44 mm.

[0029] Step 2: Furnace loading: First, ...

Embodiment 2

[0046] In this embodiment, the metal film layer is composed of stainless steel powder and paraffin substance, and the particle size of the stainless steel powder is 300 mesh to 400 mesh. In addition, the outer diameter of the metal porous membrane tube is 50 mm, and the inner diameter is 44 mm.

[0047] In this embodiment, 40° C. to 100° C. is the stage of paraffin softening and starting to decompose, and the heating rate is 2° C. / min. The early stage of volatilization of sol dispersant is the initial stage of paraffin decomposition and volatilization: the temperature rise ranges from 100°C to 180°C and the heating rate is 1°C / min, and 180°C is the temperature at which paraffin begins to volatilize; when the temperature rises to 180°C, after 30 minutes of heat preservation, Continue to sinter. The mid-stage of volatilization of the sol dispersant is the mid-stage of paraffin wax decomposition and volatilization: the temperature rise ranges from 180°C to 360°C and the temperat...

Embodiment 3

[0051] The difference between this embodiment and Embodiment 1 is that the metal film layer is composed of nickel powder, polyvinyl alcohol, water and other substances, and the particle size of the nickel powder is -500 mesh. In addition, the outer diameter of the metal porous membrane tube is 50 mm, and the inner diameter is 44 mm. All the other steps and relevant processing conditions are the same as in Example 1.

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Abstract

The invention discloses a process for an integral multiple-step multistage heat preservation sintering of a metallic porous membrane tube, which comprises the following steps: step one, processing a flange according to the inside diameter size of a tube blank of a processed and formed metallic porous membrane tube, and assembling the flange and the tube in tight fit; step two, furnace charging, which is to charge the assembled metallic porous membrane tube with the flange into a vacuum high temperature sintering furnace to perform sintering; and step three, sintering, which comprises the following steps: the stage for water evaporation, the volatilization initial stage of a sol dispersant, the volatilization intermediate stage of the sol dispersant, the volatilization final stage of the sol dispersant, the stage of temperature rise, the stage of presintering shrinkage, the stage of sintering, and the stage of temperature reduction. The process has reasonable steps, is simple and convenient to operate and control, and can effectively overcome the problems of heat affected zone generated by an argon arc welding between the metallic porous membrane tube and the flange, and peeling, shedding and the like generated by a metallic membrane layer in the sintering process.

Description

technical field [0001] The invention relates to a sintering process for metal porous membrane tubes, in particular to an integral step-by-step multi-stage heat preservation sintering process for metal porous membrane tubes. Background technique [0002] With the development of modern industrial technology, the filtration industry has higher and higher requirements for the filtration accuracy of materials, and the penetration rate is also increasing. The filtration accuracy of traditional metal porous materials is between 1 and 70 μm. When the filtration accuracy is 1 μm, the relative air permeability coefficient is less than 10m 3 / (m 2 ·h·Kpa), which can no longer meet the requirements of modern industry, so metal porous materials with high filtration accuracy and large permeation have become the research hotspots of metal porous materials in recent years. Through the optimization of the material structure, the metal porous membrane effectively alleviates the contradictor...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D69/04B22F3/11B22F3/22B01D39/20
Inventor 汤慧萍汪强兵奚正平杨保军谈萍张文彦
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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