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A kind of preparation method of metal fine powder coarsening

A technology of coarsening and aluminum powder, which is applied in the field of coarsening of metal fine powder, can solve the problems of increasing consumables and costs, reducing material density, and reducing mechanical strength, so as to reduce die loss, improve fluidity, Mutual friction force weakening effect

Active Publication Date: 2018-09-21
江峰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Now the ideal way is to coarsen the fine powder to 80μm~150μm. This kind of coarsened powder has the characteristics of large surface energy, easy shrinkage and high density of fine powder during sintering, and it is easy to add other elements. Advantages, while avoiding the problem of mold jamming caused by too fine powder, the more common method to obtain coarser fine powder is: first mix the powder to make the ball particles larger, and add a binder when the powder is mixed. It brings new problems. To eliminate the binder added to the powder (usually called "dewaxing"), some new processes need to be added to eliminate the binder. The purpose of roughening through the binder has the following disadvantages : First, the binder not only increases consumables and costs, but also tends to cause sintering atmosphere problems; second, the binder achieves dewaxing through high temperature or oxidation, which is easy to pollute the environment or the furnace; third, often reduces material sintering Density after sintering, resulting in reduced mechanical strength after sintering

Method used

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  • A kind of preparation method of metal fine powder coarsening
  • A kind of preparation method of metal fine powder coarsening
  • A kind of preparation method of metal fine powder coarsening

Examples

Experimental program
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Embodiment 1

[0019] The process of coarsening the aluminum powder in this embodiment includes four processes of mixing materials, pressing into cakes, crushing and sieving, and the specific process steps are:

[0020] (1) Mixing: 67.5-68.3wt.% high-purity gas atomization (GasAtomization) aluminum powder, 20wt.% silicon carbide (SiC), 7.4wt.% Al50-Cu50 (that is, containing 50wt.% Copper aluminum alloy) alloy powder, 3.6wt.% Al50-Mg50 (that is, aluminum alloy containing 50wt.% magnesium) alloy powder and 0.7-1.5wt.% lubricant are uniformly mixed together to obtain loose fine powder;

[0021] (2) pressing into cake: adopt press and mold to compress the loose fine powder that step (1) makes to obtain powder cake;

[0022] (3) crushing: the powder cake obtained by pressing step (2) is first ground into large particles, and then finely ground and crushed to obtain crushed powder;

[0023] (4) Sieving: use a sieving machine to sieve the powder after step (3) into three groups according to the pa...

Embodiment 2

[0026] In this embodiment, the coarsening process of water atomization (WaterAtomization) ferroalloy powder includes four processes of mixing materials, pressing into cakes, crushing and sieving. The specific process steps are:

[0027] (1) Mixing: 92.2-96.9wt.% atomized iron alloy powder (containing 0.45-1.80wt.% molybdenum and 0.0-1.8% nickel), 1.0-3.0wt.% copper powder, 1.0-3.0 wt.% nickel powder, 0.5-0.8wt.% graphite powder and 0.6-1.0wt.% lubricant are uniformly mixed together to obtain loose fine powder;

[0028] (2) pressing into cake: adopt press and mold to compress the loose fine powder that step (1) makes to obtain powder cake;

[0029] (3) crushing: the powder cake obtained by pressing step (2) is first ground into large particles, and then finely ground and crushed to obtain crushed powder;

[0030](4) Sieving: use a sieving machine to sieve the powder after step (3) into three groups according to the particle size, the diameter is less than 80 μm, the diameter i...

Embodiment 3

[0033] In this embodiment, the coarsening process of water atomized copper powder includes four processes of mixing materials, pressing into cakes, crushing and sieving, and the specific process steps are:

[0034] (1) Mixing: uniformly mix not less than 69% of high-purity water atomized copper powder, 30wt.% of tungsten powder particles and no more than 1.0wt.% of lubricant to obtain a loose fine powder;

[0035] (2) pressing into cake: adopt press and mold to compress the loose fine powder that step (1) makes to obtain powder cake;

[0036] (3) crushing: the powder cake obtained by pressing step (2) is first ground into large particles, and then finely ground and crushed to obtain crushed powder;

[0037] (4) Sieving: use a sieving machine to sieve the powder after step (3) into three groups according to the particle size, the diameter is less than 80 μm, the diameter is 80 μm ~ 150 μm, and the diameter is greater than 150 μm. Among them, the particle diameter is 80 μm ~ 150...

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Abstract

The invention belongs to the technical field of pretreatment before metal powder pressing and forming, and relates to a preparation method for coarsening metal fine powder. Firstly, the dry powder of each component is uniformly mixed together in proportion to obtain loose fine powder, and then a press and a mold are used. Press the loose fine powder in the step to obtain a powder cake; then grind the powder cake into large particles first, and then perform fine grinding for crushing to obtain the crushed powder; finally use a sieving machine to sieve the crushed powder according to the particle size points; the process is simple, the operation is convenient, the formed powder can fill the middle mold smoothly, the weight consistency is good, it is easy to press, and it can reduce the loss of the mold, prolong the life of the mold, and improve the size and accuracy of the product at the same time, and the particles are not easy to Fragmentation, easy transportation and storage, less dust and pollution, especially suitable for powders with high surface activity at room temperature.

Description

Technical field: [0001] The invention belongs to the technical field of pretreatment before metal powder pressing and forming, and relates to a preparation method for coarsening metal fine powder. Background technique: [0002] Powder metallurgy is a material-saving, energy-saving, quick-acting, non-polluting, and less-cutting, no-cutting, high-efficiency metal forming process suitable for mass production. It is also an important technology for manufacturing special metal materials. Powder metallurgy can be used in different processes , Consolidate various powdered single-element metals or alloys into near-net shape or final shape parts, and then sinter in a protective atmosphere at a temperature lower than the melting point of the main metal component, through the metallurgical bonding between powder particles, endow Part materials are based on mechanical strength and various physical properties. The consolidation method is mainly press forming. The purpose of forming is to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/04B22F1/00
CPCB22F9/04B22F1/10
Inventor 刘福平王丰元胡彬王华磊韩悦
Owner 江峰
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