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A kind of preparation method of porous stainless steel membrane

A technology of stainless steel membrane and stainless steel, applied in the field of preparation of porous stainless steel membrane, can solve the problems of peeling, shrinkage mismatch, easy peeling off of the membrane layer, etc., to reduce the sintering temperature, optimize the performance of membrane materials, and expand the scope of use.

Active Publication Date: 2016-01-20
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods have some common problems: 1. The step-by-step sintering process is complicated, and the energy consumption of multiple sintering is high; 2. Since the substrate has been sintered, the expansion of the substrate during the sintering process does not match the sintering shrinkage of the coating, and it is easy to crack , Peeling, low yield
But as we all know, the thermal expansion coefficients of powders of different materials are different and the sintering temperature of the same powder with different particle sizes is inconsistent. Due to these objective reasons, the current preparation process of asymmetric porous stainless steel or the excessive film layer The sintering flux is low, or the film layer is easy to peel off, and the mechanical strength is poor

Method used

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  • A kind of preparation method of porous stainless steel membrane

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Effect test

Embodiment 1

[0023] A kind of preparation steps of porous stainless steel membrane:

[0024] 1. Add stainless steel powder with an average particle size of 100 μm to the saturated nickel sulfate solution, stir and add an appropriate amount of zinc powder. After the zinc powder reacts completely, filter out the stainless steel powder and dry it.

[0025] 2. Use a tablet press to press a porous stainless steel body with a diameter of 30mm, the pressing pressure is 10Mpa, and the holding time is 100s.

[0026] 3. Prepare 100ml of 5wt.% PVA aqueous solution, add 10g of 5μm stainless steel powder, and stir to disperse.

[0027] 4. Prepare a 5 μm stainless steel powder film layer on the porous stainless steel body by spraying.

[0028] 5. Put the asymmetric porous stainless steel body into a high-temperature furnace. The first step is to heat it to 500°C at a heating rate of 2°C / min in an argon atmosphere, and keep it for 1 hour to remove additives; the second step is to heat it in a hydrogen a...

Embodiment 2

[0031] A kind of preparation steps of porous stainless steel membrane:

[0032] 1. Add stainless steel powder with an average particle size of 100 μm to the saturated copper sulfate solution, stir and add an appropriate amount of aluminum powder. After the aluminum powder reacts completely, filter out the stainless steel powder and dry it.

[0033] 2. Use a tablet press to press a porous stainless steel body with a diameter of 20mm, the pressing pressure is 15Mpa, and the holding time is 200s.

[0034] 3. Prepare 100ml of 5wt.% PVB ethanol solution, add 10g of 10μm stainless steel powder, and stir to disperse.

[0035] 4. Prepare a 10 μm stainless steel powder film layer on the porous stainless steel body by brushing.

[0036] 5. Put the asymmetric porous stainless steel body into a high-temperature furnace. The first step is to heat it to 500°C at a heating rate of 2°C / min in an argon atmosphere, and keep it for 1 hour to remove additives; the second step is to heat it in a ...

Embodiment 3

[0038] A kind of preparation steps of porous stainless steel membrane:

[0039] 1. Add stainless steel powder with an average particle size of 100 μm to the saturated silver nitrate solution, stir and add appropriate amount of zinc powder, after the zinc powder reacts completely, filter out the stainless steel powder and dry it.

[0040] 2. Use a tablet press to press a porous stainless steel body with a diameter of 15mm, the pressing pressure is 20Mpa, and the holding time is 300s.

[0041]3. Prepare 100ml of 2wt.% PVP solution, add 10g of 15μm stainless steel powder, and stir to disperse.

[0042] 4. Prepare a 15 μm stainless steel powder film layer on the porous stainless steel body by spraying.

[0043] Put the asymmetric porous stainless steel body into a high-temperature furnace. The first step is to heat it up to 500°C with a heating rate of 2°C / min in an argon atmosphere, and keep it for 1 hour to remove additives; the second step is to use a hydrogen atmosphere. The...

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Abstract

The invention discloses a preparation method of a porous stainless steel film. The preparation method comprises the following steps: firstly, carrying out compression molding on large-grain-size stainless steel powder coated with a low-melting-point metal layer on the surface through a powder compressing machine; secondly, preparing a stainless steel powder film layer on a molded blank body; and finally, sintering to obtain the highly-asymmetrical porous stainless steel film. According to the preparation method provided by the invention, the stainless steel powder surface of the base body for preparation is coated with the low-melting-point metal layer so as to reduce the sintering temperature of stainless steel powder of the base body. Therefore, the base body and the film layer are sintered together; the asymmetrical degree of the prepared porous stainless steel film material is high; the pore diameter distribution of the film layer is narrow; the film layer and the base body are firmly combined; the low-melting-point metal on the surface of the base body powder and the base body powder are alloyed by high temperature sintering; meanwhile, the mechanical intensity of the film material is ensured, and the other metal properties of the porous stainless steel film are improved.

Description

technical field [0001] The invention relates to a preparation method of a porous stainless steel membrane, in particular to a preparation method of a porous stainless steel membrane with the characteristics of low preparation cost, high degree of asymmetry, narrow pore size distribution, strong membrane adhesion and the like. Background technique [0002] Energy issues have a major impact on the development of the world today, and energy conservation is one of the hotspots of current scientific research. In chemical production, the purification and separation of products consumes a lot of energy. Therefore, the use of low-energy methods to separate substances can result in a significant reduction in energy consumption. Membrane separation is an emerging low-energy separation technology. [0003] Compared with well-known traditional separation methods such as evaporation and fractionation, the membrane separation process has the outstanding advantages of high efficiency, lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/02B01D67/00B22F7/02
Inventor 黄彦俞健徐吉权胡小娟魏磊刘强谌洪图蔡毅
Owner NANJING TECH UNIV
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