Method for preparing microporous metal layer on macroporous metal surface

A technology of porous metal and metal layer, which is applied in the production field of porous metal with high gradient pore structure, can solve the problems of reduced corrosion resistance, toughness, and change of metal properties of metal materials, and achieves good film forming effect, quality assurance, and solution The effect of carbon deposition

Active Publication Date: 2015-09-09
江苏七禾新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

This method solves the problem of preparing a gradient film layer on the finished product of the macroporous metal substrate, but when powder coating, because the surface tension of organic fillers such as paraffin is small (for example, the surface tension of paraffin is only 20mN / m), no matter spraying or brushing , powder suspensions are difficult to spread evenly on the surface of the substrate, and pre-treatment of the surface with surfactants not only increases the cost, but also introduces impurity ions
In addition, the heat treatment process of this method should be carried out in a special degreasing furnace, and the degreasing must be thorough, otherwise, in the subsequent sintering process, excessive carbon deposits will lead to changes in the properties of some metals (often resulting in reduced corrosion resistance of metal materials. , toughness decreased)

Method used

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  • Method for preparing microporous metal layer on macroporous metal surface
  • Method for preparing microporous metal layer on macroporous metal surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1) Select a porous stainless steel disc as the substrate, with a diameter of 200mm, a thickness of 2mm, and a pore size of 150um; mix 50g of calcium oxide and 50g of water to prepare a calcium hydroxide slurry; the raw material for preparing the microporous layer is stainless steel powder with an average particle size of 10μm.

[0018] 2) Brush the above-mentioned slurry on the surface of the stainless steel disc by brushing, scrape off the excess slurry with a scraper, put it into a muffle furnace for drying, and pass in carbon dioxide gas; after drying, use 240 and 600 meshes successively Grind the surface of the substrate with sandpaper, rinse the substrate with clean water and dry it in an oven.

[0019] 3) Mix 20g of SS-316L stainless steel powder with an average particle size of 10μm and 100ml of polyvinyl alcohol (PVA) solution with a mass fraction of 0.5%, and ultrasonically 10min to form a uniformly dispersed slurry, which is brushed onto the surface of the subs...

Embodiment 2

[0024] 1) Select a porous stainless steel tube as the substrate, with an outer diameter of 60mm, an inner diameter of 55mm, a length of 1000mm, and a pore diameter of 50um; mix 50g of magnesium hydroxide with 50g of water to prepare a magnesium hydroxide slurry; the raw material for preparing the microporous layer is an average particle size of 2μm of silver powder.

[0025] 2) with the step (2) of embodiment 1

[0026] 3) Mix 200g of silver powder with an average particle size of 2 μm and 1000ml of polymethylcellulose (MC) solution with a mass fraction of 0.2%, and ultrasonically 10min to form a uniformly dispersed slurry, which is brushed onto the surface of the substrate and dried.

[0027] 4) The green body is sintered under an argon atmosphere. The heating program is: heating to 500°C at a rate of 2°C / min, holding for 1 hour, then heating to 800°C at a rate of 1°C / min, holding for 1.5 hours to obtain a gradient silver / stainless steel composite microfiltration membrane ma...

Embodiment 3

[0031] 1) Select a porous copper tube as the substrate, with an outer diameter of 20mm, an inner diameter of 16mm, a length of 100mm, and a pore diameter of 200um; mix 50g of magnesium hydroxide with 50g of water to prepare a magnesium hydroxide slurry; the raw material for preparing the microporous layer is an average particle size of 2μm of silver powder.

[0032] 2) with the step (2) of embodiment 1

[0033]3) Mix 200g of silver powder with an average particle size of 2 μm and 1000ml of polymethylcellulose (MC) solution with a mass fraction of 0.2%, and ultrasonically 10min to form a uniformly dispersed slurry, which is brushed onto the surface of the substrate and dried.

[0034] 4) The green body is sintered under an argon atmosphere. The heating program is: heating to 400°C at a rate of 2°C / min, holding for 1 hour, then heating to 600°C at a rate of 1°C / min, holding for 1.5 hours to obtain a gradient silver / stainless steel composite microfiltration membrane material con...

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Abstract

The present invention relates to a method for preparing a microporous metal layer on the macroporous metal surface. The specific process comprises: brushing a hydroxide slurry on the surface of a macroporous metal substrate by using a brushing method to block pores, drying, and progressively carrying out burnishing, washing and drying on the obtained surface of the metal substrate by using sand paper; mixing metal powder for preparing the microporous metal layer and an organic additive to prepare a suspension, coating on the surface of the metal substrate to form a billet, and carrying out high temperature sintering in an inert or reducing atmosphere; and finally using a chemical reagent and ultrasonic washing to remove the residual inorganic material in the substrate to obtain the high gradient pore structure porous metal.

Description

technical field [0001] The invention relates to a method for preparing a microporous metal layer on the surface of a macroporous metal, in particular to a production method for a porous metal with a high gradient pore structure. Background technique [0002] Porous metal materials have high mechanical strength, controllable pore size, good temperature resistance, and weldability, and are widely used in petroleum, chemical, food, pharmaceutical, environmental protection, automobile, noise reduction and other fields. In particular, metal materials have significantly better resistance to organic solvents and thermal shock than other membrane materials, and are widely used in the filtration section of chemical, pharmaceutical and other industries. In industrial applications, parameters such as filtration accuracy, mass transfer resistance, and mechanical strength of porous metals are very important. However, conventional porous metals (symmetrical porous metal materials) are dif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D69/02B01D67/00
Inventor 李袁杰杨佳辉俞健高阳贺建
Owner 江苏七禾新材料科技有限公司
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