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A preparation method of an integral powder sintered external light filter tube

An integral, powder-based technology, applied in the field of powder metallurgy products, can solve the problems of difficulty in meeting the service life requirements of filter tubes, easy corrosion and cracking of welds, and high bonding strength of filter cakes on the outer surface, achieving significant economic and social benefits. Benefit, low cost, excellent sintering strength

Active Publication Date: 2022-02-18
WESTERN BAODE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This structure has the following problems: ①Due to stress concentration and material differences at the weld, corrosion and cracking are prone to occur at the weld, making it difficult to meet the requirements of the modern industry for the service life of the filter tube; ②The filter cake on the outer surface is combined during filtration High strength, not easy to blow back or wash off, it is difficult to ensure long-term operation
At present, the patent of the outer light filter tube with flange and bottom is only "A kind of internal pressure cold isostatic pressing mold with flange powder filter tube", the publication number is CN200720031815, because the mold (porous) mandrel is uniform The thickness of the powder at the variable diameter flange is greater than that of the tube body. After the isostatic pressing process, the powder compression distance at the flange is greater than the compression distance at the tube body, resulting in the inner diameter of the variable diameter section of the flange being a " Bell mouth" structure, as the ratio of filter tube flange outer diameter: (filter tube flange outer diameter - filter tube outer diameter) increases, the "bell mouth" angle becomes larger. After the finished product is finished (sealing surface), the French The more serious the "thin-wall and weak area" at the blue diameter is, it is not conducive to the long-term use of the filter tube

Method used

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  • A preparation method of an integral powder sintered external light filter tube
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  • A preparation method of an integral powder sintered external light filter tube

Examples

Experimental program
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Effect test

Embodiment 1

[0059] The preparation of the integral powder sintered external light filter tube adopts a cold isostatic pressing mold; the cold isostatic pressing mold includes a core tube 6 and an outer mold sleeve 3, the outer mold sleeve 3 is set on the outside of the core tube 6, and the outer wall of the core tube 6 is sleeved There is an inner rubber sleeve 5, and the end of the inner rubber sleeve 5 close to the opening of the core tube 6 is sequentially installed with a centering ring 8 and a rubber ring sleeve 9, and the end of the outer mold cover 3 close to the opening of the core tube 6 is fixedly connected with the centering ring 8, and the outer The other end of the mold cover 3 is equipped with a steel plug 2, and the top of the steel plug 2 is equipped with a rubber plug 1, and the outside of the rubber plug 1 and the outer mold cover 3 are equipped with an outer rubber sleeve 7; the steel plug 2, the inner rubber sleeve 5, the outer An n-type cavity is arranged between the d...

Embodiment 2

[0069] The cold isostatic pressing mold that adopts is identical with embodiment 1.

[0070] The preparation method of an integral powder sintered external light filter tube of the present invention is as follows:

[0071] (1) The cold isostatic pressing mold is placed on the vibration table, and the metal powder 4 is filled with the metal powder 4 by the centering ring 8 and is vibrated for later use; wherein, the metal powder 4 is pure nickel; the particle size of the metal powder 4 is 100 / 160 mesh, the volume is 316L;

[0072] (2) Place and fix the cold isostatic pressing mold loaded with metal powder 4 into the working cavity of the cold isostatic pressing machine, press the metal powder 4 and lower it to normal pressure, take out the cold isostatic pressing mold, and remove the rubber Plug 1, steel plug 2, inner rubber sleeve 5, core pipe 6, outer rubber sleeve 7, centering ring 8 and rubber ring sleeve 9, to obtain a powder green body with outer mold sleeve 3; wherein,...

Embodiment 3

[0078] The cold isostatic pressing mold that adopts is identical with embodiment 1.

[0079] (1) The cold isostatic pressing mold is placed on the vibrating table, and the metal powder 4 is filled with the metal powder 4 by using the centering ring 8 and is vibrated for subsequent use; wherein the metal powder 4 is a monel alloy; the particle size of the metal powder 4 is 60 / 100 mesh, take 400L;

[0080] (2) Place and fix the cold isostatic pressing mold loaded with metal powder 4 into the working cavity of the cold isostatic pressing machine, press the metal powder 4 and lower it to normal pressure, take out the cold isostatic pressing mold, and remove the rubber Plug 1, steel plug 2, inner rubber sleeve 5, core pipe 6, outer rubber sleeve 7, centering ring 8 and rubber ring sleeve 9, to obtain a powder green body with outer mold sleeve 3; wherein, the cold isostatic press The pressing pressure is 180MPa, and the holding time is 6min;

[0081] (3) Evenly load white corundum...

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Abstract

The invention discloses a method for preparing an integral powder sintered external light filter tube. Firstly, a cold isostatic pressing mold is assembled, followed by powder filling, preparation of a powder green body, preparation of a green body assembly, and sintering to obtain the outer light filter tube. The light-type powder sintered filter tube semi-finished product, and finally the flange sealing surface of the external light-type powder sintered filter tube semi-finished product is machined to obtain an integral powder sintered external light filter tube. The preparation method of an integral powder sintered outer light filter tube of the present invention can not only effectively solve the poor blowback or cleaning and regeneration effect of the traditional outer hair inner light tube, but also solve the problem that the existing outer light tube is broken and damaged at the welding joint, and the service life short question.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy products, in particular to a method for preparing an integral powder sintered external light filter tube. Background technique [0002] It is essential to apply powder sintered filter tubes in the production of nuclear industry, petrochemical industry, coal chemical industry, polysilicon and other fields. The powder sintered filter tube has good stability in many corrosive media such as gas-solid separation and dust removal, hydrofluoric acid, alkali, seawater, nitric acid, organic acid, etc., especially in high-temperature environments. Efficient operation is more prominent. [0003] At present, the structure of sintered metal porous elements is mostly implemented with reference to GB6886-2017 (sintered stainless steel filter elements) and GB6887-2007 (sintered metal filter elements), which stipulate that tubular metal elements are welded flange structures. Therefore, most of the powd...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/04B22F3/03B22F5/12
CPCB22F3/04B22F3/03B22F5/106B22F2998/10
Inventor 邓颖刘高建周济李永利
Owner WESTERN BAODE TECH CO LTD
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