Method for realizing metal injection molding by injection slurry

A technology of injection molding and slurry, which is applied in the field of metal injection molding by injecting slurry, which can solve the problems of complex process, large metal specific surface area, and the risk of aggravating powder oxidation, and achieve the effect of simplifying the process and avoiding component segregation

Inactive Publication Date: 2021-10-01
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the metal has a large specific surface area in the powder state, and some active metals, such as titanium, are highly sensitive to interstitial elements such as oxygen and carbon, and need to be heated during the feeding and injection processes, which exacerbates the risk of powder oxidation
At the same time, traditional feeding needs to use solvent stripping or acid stripping to remove the main binder in the injection body for subsequent degreasing and sintering, and the process is complicated

Method used

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  • Method for realizing metal injection molding by injection slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for injecting slurry to realize metal injection molding, the specific preparation steps are as follows:

[0029] (1) Design the mold according to the target shape. The mold core of the mold is made of porous 45 steel with a relative density of 88% and is full of connected pores. The mold base is made of Q235 steel, and the vent hole is reserved.

[0030] (2) Mix 40 μm spherical titanium powder with isopropanol, polyvinyl acetate, and oleic acid in a volume percentage of 60:19:20:1, and mix evenly with a ball mill to obtain a uniform powder suspension slurry;

[0031] (3) Heat the mold to 50°C with a mold temperature controller, inject the injection slurry in step (2) into the mold, set the mold clamping time to 15s, and take out the injection body after the solvent is volatilized and solidified;

[0032] (4) Degumming and sintering the injection green body in step (3) in a degreasing and sintering furnace. The degumming process is 300°C for 2h, 500°C for 3h, an...

Embodiment 2

[0034] A method for injecting slurry to realize metal injection molding, the specific preparation steps are as follows:

[0035] (1) Design the mold according to the target shape. The mold core of the mold is made of porous 45 steel with a relative density of 85% and is full of interconnected pores. The mold base is made of Cr12 steel, and vent holes are reserved.

[0036] (2) Mix 10 μm 316L stainless steel powder with tert-butanol, polyisobutylene, and polyethylene glycol at a ratio of 53:25:20:2, and beat with ultrasonic vibration to obtain a uniform powder suspension slurry;

[0037] (3) Heat the mold to 40°C with a mold temperature controller, inject the injection slurry in step (2) into the mold, set the mold clamping time to 10s, and take out the injection body after the solvent is volatilized and solidified;

[0038] (4) Degumming and sintering the injection green body in step (3) in a degreasing and sintering furnace. The degumming process is to keep warm at 450°C for ...

Embodiment 3

[0040] A method for injecting slurry to realize metal injection molding, the specific preparation steps are as follows:

[0041] (1) Design the mold according to the target shape. The mold core of the mold is made of porous Cr12 steel with a relative density of 80% and is full of interconnected pores. The mold base is made of Q235 steel, and vent holes are reserved.

[0042] (2) Mix 20 μm high-speed steel W18Cr4V powder with deionized water, chlorosulfonated polyethylene, and ammonium citrate at a ratio of 60.5:18:20:1.5, and mix evenly by ultrasonic vibration to obtain a uniform powder suspension slurry;

[0043] (3) Heat the mold to 55°C with a mold temperature controller, inject the injection slurry in step (2) into the mold, set the mold clamping time to 8s, and take out the injection body after the solvent is volatilized and solidified;

[0044] (4) Degumming and sintering the injection body in step (3) in a degreasing and sintering furnace. The degumming process is 400°C...

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Abstract

The invention discloses a method for realizing metal injection molding by injection slurry and belongs to the field of metal injection molding. According to the invention, metal powder, a polymer monomer, a dispersing agent and a solvent serve as raw materials and are evenly mixed to obtain the injection slurry, the injection slurry is injected into a heated mold through an injection machine (a mold core of the mold is made of porous metal), bubbles and the solvent in the slurry are removed through a porous channel, and solvent volatilization is realized under the effect of mold temperature; and then in-situ curing forming of an injection green body is realized, and the injection green body obtained after demolding is degreased and sintered to obtain a metal part in a complex shape. solvent volatilization of the injection slurry is realized by using the porous metal as an injection mold, so that in-situ curing is triggered, and an injection green body is obtained. The preparation and injection of the injection slurry can be carried out at normal temperature, so that the requirements on the production environment are reduced, the traditional solvent removal/acid removal process is omitted, degumming and sintering can be directly carried out, and the method is simple in process, short in flow, high in applicability and suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of metal injection molding and provides a method for injecting slurry to realize metal injection molding. Background technique [0002] Metal Injection Molding (MIM) is a near-net forming technology that combines plastic injection molding with new powder metallurgy technology. A binder is added to the metal powder to make it have a certain fluidity, and it is injected into the mold and formed, and then removed. Binder and sintered to obtain metal products with high strength and good wear resistance. Metal injection molding combines the advantages of plastic injection molding and powder metallurgy. It can not only produce metal parts with complex shapes, but also minimize the segregation of alloy components, that is, both shape and performance are taken into account. [0003] Generally speaking, in the process of making injection feed, it is necessary to heat the binder to a molten state so that it can be evenly mixed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/22B22F3/10
CPCB22F3/225B22F3/1021
Inventor 杨芳常慧荣王海英郭志猛陈存广隋延力杨松
Owner UNIV OF SCI & TECH BEIJING
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