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Preparation method of high-precision gradient pore filter element

A gradient porosity and high-precision technology, applied in the field of powder metallurgy, can solve the problems of poor bonding between the membrane layer and the tube body, complex manufacturing process, difficult precision control, etc., and achieve the effect of improving filtration efficiency, simple process and high filtration efficiency.

Active Publication Date: 2022-05-24
WESTERN BAODE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, the bonding degree between the film layer and the tube body is poor, the manufacturing process is complicated, and the precision control is difficult, which will lead to problems of uneven coating and easy falling off

Method used

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  • Preparation method of high-precision gradient pore filter element
  • Preparation method of high-precision gradient pore filter element
  • Preparation method of high-precision gradient pore filter element

Examples

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Effect test

preparation example Construction

[0040] like figure 1 As shown, the present invention provides a preparation method of a high-precision gradient pore filter element, comprising:

[0041] Step 1. Mix the metal powder and the pore-forming agent to form a mixed powder with a particle size of 1 μm-100 μm. The specific preparation of the mixed powder includes the following steps:

[0042] Step 101, the raw material of the outermost large-pore filter element is the first mixed powder mixed with metal powder and pore-forming agent, wherein the mass fraction of the pore-forming agent in the first mixed powder is 30w%-50w%; The raw material is the second mixed powder mixed with metal powder and pore-forming agent, wherein the mass fraction of the pore-forming agent in the second mixed powder is 20w%-40w%; the raw material of the innermost small-pore filter element is mixed with metal powder and pore-forming agent The third mixed powder, wherein the mass fraction of the pore-forming agent in the third mixed powder is ...

Embodiment 1

[0060] The following mixed powder raw materials select nickel carbonyl powder with a particle size of 5 μm, adjust the addition amount of urea to carry out the gradient change of pores, and the preparation method is as follows:

[0061] Step 1: Preparation of mixed powder raw materials: The raw materials are 5μm carbonyl nickel powder and urea, wherein the addition amount of urea in the first filter tube of the outermost layer is 30t%; the addition amount of urea in the second filter tube of the middle layer is 20w%. The amount of urea added in the third filter tube of the layer is 10w%. The carbonyl nickel powder and urea were respectively mixed with deionized water to make a mixed solution and canned, and then placed on a roller ball mill and mixed for 3 hours to make the powder mixed evenly. After the mixing is completed, it is dried in an electric furnace, and the powder is stirred during the drying process until the powder is completely dried. Then, the mixed dry materia...

Embodiment 2

[0067] The following mixed powder raw materials select carbonyl nickel powder with particle sizes of 5 μm, 10 μm and 15 μm, adjust the addition amount of urea to 15%, and carry out gradient change of pores. The preparation method is as follows:

[0068] Step 1: Preparation of mixed powder raw materials: As the raw material of the first filter tube in the outermost layer, take 15 μm nickel carbonyl powder and add 15w% urea; as the raw material of the second filter tube in the middle layer, take 10 μm nickel carbonyl powder and add 15w% urea. The raw material of the three filter tubes is 5μm nickel carbonyl powder and 15w% urea is added. The mixing and drying method was the same as that of Example 1, and the mixed powder with a particle size of 50 μm was sieved with a screen. The sieved mixed powder was put into the ball mill and mixed for 3 hours. After the mixing was completed, the subsequent pressing was waited for. Prepare the mixed powder raw materials of the three filter ...

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Abstract

The invention belongs to the technical field of powder metallurgy, and particularly relates to a preparation method of a high-precision gradient pore filter element, which comprises the following steps: mixing metal powder and a pore forming agent to form mixed powder with the particle size of 1-100 mu m; feeding the mixed powder into a mold, and carrying out cold isostatic pressing to obtain three filter tubes with gradient pores; internally sleeving three filter tubes with gradient pores according to the pore size sequence to obtain a green body; and sintering the green body to obtain the integrally sintered high-precision gradient pore filter element. According to the preparation method of the high-precision gradient pore filter element, provided by the invention, the technical problems of gradient layer layering, falling and non-uniform pore density of the filter element can be avoided through a simple process, so that the filter efficiency and the strength of the filter element are improved on the premise of the same filter precision of the filter element.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and particularly relates to a preparation method of a high-precision gradient pore filter element. Background technique [0002] Filter tube is an important part for separating, classifying, purifying and enriching mixed gas or liquid. It is widely used in chemical, petroleum, metallurgy, electric power and other industries and requires high permeability. In current filters, especially dust filters, dust will gradually accumulate on the outside of the filter element during the working process of the filter, resulting in the phenomenon of dust bridging between the filter elements. When the dust accumulation is serious, it will even block the membrane surface of the filter element, which will reduce the filtration efficiency of the filter. Therefore, the filter element of the filter needs to be repaired and replaced frequently, which increases the cost of use. The traditional filter ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/11B22F3/04B22F3/10B22F5/10
CPCB22F3/1109B22F3/04B22F3/10B22F5/10
Inventor 王昱羿昌波张静刘静李来平刘高建雷雨
Owner WESTERN BAODE TECH CO LTD
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