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Method for forming ultrathin-wall porous metal pipe fitting

A porous metal, ultra-thin-walled technology, applied in the field of ultra-thin-walled porous metal pipe fittings, can solve problems such as difficulty in meeting porosity and pore size, particle plastic deformation, and the inability to effectively control the pore size of parts, and improve the forming process. Condition, production cost reduction, avoid complex trait constraints and the effect of energy consumption problems

Inactive Publication Date: 2013-11-06
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the extrusion process, the particles undergo plastic deformation, and the pore size of the product cannot be effectively controlled, and it is difficult to meet the special requirements for the porosity and pore size of the product.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Implementation example 1: Gel injection molding of thin-walled porous stainless steel pipe fittings (diameter 65.5mm, wall thickness 2.0mm, height 150mm, porosity 62.4%, pore size 50~100um)

[0019] 1. Weigh 300g of 325-mesh stainless steel powder and 30g of glucose powder (use a 160-mesh, 300-mesh sieve to take particles with a particle size of 50-100um), add 31 ml of hydroxyethyl methacrylate (HEMA) and 31 ml of toluene In the organic solution, mix and stir;

[0020] 2. Weigh 3g of Solsperse-6000 hyperdispersant and add it to the slurry in the first step, and mix evenly to prepare the suspension slurry;

[0021] 3. Take 0.4g of benzoyl peroxide (catalyst) and 1.5ml of dimethylaniline (initiator) respectively and add them to the suspension slurry, stir well and slowly pour into the pre-prepared mold, and solidify at room temperature after injection Forming to obtain the pipe fitting blank;

[0022] 4. Place the pipe fitting body in a drying oven with a constant tempe...

Embodiment 2

[0024] Implementation example 2: Gel injection molding of thin-walled titanium pipe fittings (outer diameter 90mm, wall thickness 3mm, height 170mm, porosity 68%, pore size 50~100um)

[0025] 1. Weigh 200g of 325-mesh titanium powder and 20g of glucose powder (use 160-mesh, 300-mesh sieve to take particles with a particle size of 50~100um), add 58ml of hydroxyethyl methacrylate (HEMA) and 58ml of toluene In an organic solution, mix and stir;

[0026] 2. Weigh 5g of Solsperse-6000 hyperdispersant and add it to the slurry in the first step, and mix evenly to prepare the suspension slurry;

[0027] 3. Take 0.75g of benzoyl peroxide (catalyst) and 1.3ml of dimethylaniline (initiator) respectively and add them to the suspension slurry. After stirring evenly, slowly pour into the pre-prepared mold, and solidify at room temperature after injection. Forming to obtain the pipe fitting blank;

[0028] 4. Place the pipe fitting body in a drying oven with a constant temperature of 70°C ...

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PUM

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Abstract

A method for forming an ultrathin-wall porous metal pipe fitting belongs to the field of powder metallurgy production and includes the steps: firstly, adding monomers and crosslinking agents into organic solvents or deionized water according to the volume ratio of 1-120:1 to prepare pre-mixed liquor with the concentration of 5-50wt%; secondly, mixing metal powder and pore-forming agents with the prepared pre-mixed liquor of a stable gel system, adding dispersing agents accounting for 0.05-5wt% of the mass of metal powder, adjusting pH (potential of hydrogen) and stirring or ball-milling the mixture for 2-10h to prepare suspending slurry with fine flowability; thirdly, adding 0.1-3.5wt% of catalysts and initiating agents, evenly stirring the mixture, filling the mixture into a large-size mould in a complicated shape after vacuum degassing, demoulding after solidifying the mixture for 30s-30min at the temperature of 30-90 DEG C, and drying a blank in vacuum or protective atmosphere; and finally sintering the blank into a pair. The method can be used for preparing the ultrathin-wall porous metal pipe fitting, so that the problem of easiness of breakage in pressure forming is avoided. By adjusting the content and the granularity of the pore-forming agents, the porosity and the pore size of the part are controlled, and the method is simple in process and low in production cost.

Description

technical field [0001] The invention relates to a method for forming ultra-thin-wall porous metal pipe fittings, which belongs to the field of metal parts preparation in powder metallurgy production technology, and in particular provides a gel injection molding technology for near-net-shaped ultra-thin-wall porous metal pipe fittings. technical background [0002] Porous metal pipe fittings are mainly used for the filtration of polyester, oil, pharmaceuticals, food and beverage and chemical products, as well as for the filtration of water and air. It has excellent corrosion resistance, oxidation resistance, wear resistance, mechanical properties (ductility and impact strength) and other characteristics, and also has the characteristics of simple manufacturing process, long service life, renewable, etc. In addition, it has permeability, Special properties such as noise reduction, so it is widely used in functional fields such as filtration, separation, and fluid distribution ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/11B22F5/10B22F3/22
Inventor 邵慧萍魏然郭志猛林涛杨栋华王军谭易明叶青
Owner UNIV OF SCI & TECH BEIJING
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