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Firing Process of Porous Stainless Steel Membrane

A stainless steel membrane and stainless steel technology, applied in the field of membrane materials, can solve the problems of poor corrosion resistance, lower membrane permeability, and lower porosity, and achieve the effects of avoiding membrane layer collapse, increasing membrane permeability, and improving sintering

Active Publication Date: 2019-07-19
NANJING TECH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Insufficient sintering leads to insufficient membrane strength and poor corrosion resistance, while excessive sintering leads to collapse of the membrane layer, decrease in porosity, and decrease in permeability of the membrane
In addition, due to the complexity of the sintering furnace, the rate of temperature rise and fall during the sintering process is also greatly limited, and it is difficult to balance the fundamental contradiction between the sintering strength of the film and the sintering collapse

Method used

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  • Firing Process of Porous Stainless Steel Membrane
  • Firing Process of Porous Stainless Steel Membrane
  • Firing Process of Porous Stainless Steel Membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) The selected support is a 316L porous stainless steel tube with an outer diameter of 60 mm, a wall thickness of 3 mm, a length of 0.5 m, and an average pore diameter of about 20 μm.

[0019] (2) 200g of 316L type stainless steel powder with an average particle diameter of 3 μm is mixed with 500 ml of a 3% polyvinyl alcohol (PVA) solution and stirred vigorously to form a slurry.

[0020] (3) Spray the slurry on the surface of the support with a pneumatic spray gun, the thickness of the coating is about 150 μm, and let it dry naturally.

[0021] (4) The green body was heated up to 500° C. at a rate of 2° C. / min under an argon atmosphere and kept for 1.5 hours to remove organic components.

[0022] (5) In the vacuum system, the green body is rotated, slowly and uniformly fed from top to bottom into the electric furnace, the rotation speed is 60r / min, the furnace temperature is 1650°C, and the sintering retention time is 20s. After the green body leaves the furnace, it...

Embodiment 2

[0025] (1) The selected support is a 316-type porous stainless steel tube with an outer diameter of 30 mm, a wall thickness of 2 mm, a length of 1 m, and an average pore diameter of about 25 μm.

[0026] (2) 300 g of 316 type stainless steel powder with an average particle diameter of 5 μm and 500 ml of a 3% polyvinylpyrrolidone (PVP) solution were mixed and vigorously stirred to form a slurry.

[0027] (3) The slurry is coated on the surface of the support body by brushing method and baked by an infrared lamp, and the thickness of the coating is about 200 μm.

[0028] (4) Raise the green body to 350°C at a rate of 0.5°C / min in an air atmosphere and keep it for 0.5h to remove the organic components.

[0029] (5) In the vacuum system, the green body is rotated, slowly and uniformly fed from top to bottom into the electric furnace, the rotation speed is 100r / min, the furnace temperature is 1700°C, and the sintering retention time is 20s. After the green body leaves the furnace,...

Embodiment 3

[0031] (1) The selected support is a 316L porous stainless steel tube with an outer diameter of 60 mm, a wall thickness of 4 mm, a length of 0.5 m, and an average pore diameter of about 25 μm.

[0032] (2) 100 g of 316L type stainless steel powder with an average particle diameter of 8 μm was mixed with 500 ml of a 3% gum arabic powder solution and vigorously stirred to form a slurry.

[0033] (3) Use a spray gun to evenly paint the slurry on the surface of the support with a coating thickness of about 250 μm, and dry it in an oven at 120° C. for 2 hours.

[0034] (4) The green body is heated up to 450° C. at a rate of 2° C. / min under a hydrogen atmosphere and kept for 1 hour to remove organic components.

[0035] (5) Under the hydrogen atmosphere, rotate the green body, and send it slowly and uniformly from left to right into the electric furnace, the rotation speed is 100r / min, the furnace temperature is 1750°C, and the sintering retention time is 35s. After the green body ...

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Abstract

The invention relates to a firing process of a porous stainless steel film. The firing process comprises: coating slurry containing stainless steel powder on a stainless steel supporting body to form a blank; conveying the blank into a hearth of a sintering furnace at a rotary state; controlling the temperature of a constant-temperature region of the hearth to be 1300 DEG C to 2200 DEG C and keeping the blank staying in the constant-temperature region for 10s to 300s; rapidly sintering and rapidly cooling the blank under an overheating condition, so as to realize sufficient sintering of the stainless steel powder. By adopting the firing process provided by the invention, the strength and corrosion resistance of the film are improved, a film layer is prevented from collapsing, and the porosity and permeability of the film are improved; furthermore, in a sintering process, the temperature raising speed of the supporting body is relatively slow and heating expansion is relatively small, so that the contradiction of expansion of the supporting body and sintering shrinkage of the film layer is alleviated and the problems that the film layer is cracked and falls off are reduced.

Description

technical field [0001] The invention belongs to the field of membrane materials, and relates to a firing process of a porous stainless steel membrane, that is, a stainless steel carrier is coated with a layer of stainless steel powder as a green body, and the green body is rapidly sintered under overheating conditions and rapidly cooled to prepare a porous stainless steel membrane. . Background technique [0002] The working principle of the membrane is to achieve the separation and purification of substances through pore sieving. It has the advantages of high separation efficiency, energy saving, environmental protection, simple operation, small investment, and easy automation control. It is widely used in water treatment, petrochemical, energy, smelting, and pharmaceutical industries. , environmental protection and other fields are widely used. Membrane materials can be divided into organic membranes and inorganic membranes: organic membranes are susceptible to acid and a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D71/02
CPCB01D67/0041B01D71/022
Inventor 黄彦巩栋栋王凯峰赵倩如岳静怡张凡
Owner NANJING TECH UNIV