Preparation method of aluminium base powder metallurgy part with densifying surface

A powder metallurgy and densification technology, applied in the field of preparation of aluminum-based powder metallurgy parts, can solve the problems of lack of wear resistance and strength, and achieve the effects of reduced workload, good wear resistance and wide application range

Active Publication Date: 2016-04-06
NBTM NEW MATERIALS GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current application of powder metallurgy aluminum products is still limited to a specific field that seeks high cost performance and near-net forming. Because of the existence of voids in powder metallurgy parts, most of the current general-purpose aluminum-based powder metallurgy products do not have High wear resistance and strength

Method used

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  • Preparation method of aluminium base powder metallurgy part with densifying surface
  • Preparation method of aluminium base powder metallurgy part with densifying surface
  • Preparation method of aluminium base powder metallurgy part with densifying surface

Examples

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Effect test

Embodiment 1

[0045] The preparation method of the aluminum-based powder metallurgy parts with densified surface in the present invention comprises the following steps:

[0046] (1) Design material composition: by weight percentage, the materials used include pure aluminum powder, the pure aluminum powder is atomized aluminum powder, the oxygen content in the atomized aluminum powder is less than 0.02%, the silicon content is less than 0.05%, pressed Performance greater than 2.60g / cm2 at 250MPa 3 , bulk density greater than 1.05g / cm 3 , the flow rate is 30s / 50g, and the average particle size range is 10μm;

[0047] (2) Mixing: add lubricant accounting for 0.2% of the total mass of mixing to the atomized aluminum powder of step (1);

[0048] (3) Compression: The mixture obtained in step (2) is pressed to a density greater than 2.6g / cm under a pressure of 300MPa 3 green parts, such as Figure 5 shown;

[0049] (4) Sintering: Sinter the green body of the part obtained in step (3) in a non...

Embodiment 2

[0054] The preparation method of the aluminum-based powder metallurgy parts with densified surface in the present invention comprises the following steps:

[0055] (1) Design material composition: by weight percentage, the materials used include pure aluminum powder, the pure aluminum powder is atomized aluminum powder, the oxygen content in the atomized aluminum powder is less than 0.02%, the silicon content is less than 0.05%, pressed Performance greater than 2.60g / cm2 at 250MPa 3 , bulk density greater than 1.05g / cm 3 , the flow rate is 30s / 50g, and the average particle size range is 150μm;

[0056] (2) Mixing: add lubricant accounting for 0.8% of the total mass of mixing in the atomized aluminum powder of step (1);

[0057] (3) Compression: The mixture obtained in step (2) is pressed to a density greater than 2.6g / cm under a pressure of 300MPa 3 green parts, such as Figure 6 shown;

[0058] (4) Sintering: Sinter the green body of the part obtained in step (3) in a no...

Embodiment 3

[0063] The preparation method of the aluminum-based powder metallurgy parts with densified surface in the present invention comprises the following steps:

[0064] (1) Design material composition: by weight percentage, the materials used include copper 4.5%, magnesium 1.0%, silicon 1.0%, unavoidable impurities not exceeding 2%, and the balance of aluminum; copper is in the form of electrolytic copper powder Add; Mg is added in the form of Al-Mg master alloy powder, and the Mg content in the Al-Mg alloy master powder is 25 (wt)%; Si is added in the form of Al-Si master alloy powder, and Si in the Al-Si alloy master powder The content is 37 (wt)%; the remaining Al is added in the form of atomized aluminum powder;

[0065] (2) Mixing: According to the material composition of step (1), each component is mixed to obtain a mixed powder, and a lubricant that accounts for 1.5% of the total mass of the mixed material is added to the mixed powder; Material machine, the speed of the mix...

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Abstract

The invention relates to a preparation method of an aluminium base powder metallurgy part with a densifying surface. According to the preparation method, a special extrusion female die used for extruding the external surface of a part and an extrusion core rod used for extruding the internal surface of the part are adopted, an upper punch die and a lower punch die which are used for clamping the part achieve an auxiliary effect, and particular extrusion steps are adopted for matching. During use, the part is fixed, the corresponding extrusion die is moved to complete extrusion, and in such a way, the crack defect of the part generated after the part is extruded and then subjected to die stripping is avoided. Compared with energy required for surface plastic property densifying after the sintering step in the prior art, the preparation method has the advantages that large deformation depth is obtained in small extrusion allowance; the energy requirement is remarkably reduced; the production cost is reduced; the densifying degree is improved; the whole intensity of a product after extrusion can exceed 2.75g/cm<3>; the relative intensity of the product surface can reach 99% or above; the coverage rate of a densifying layer is high; the aluminium base powder metallurgy part has good abrasive resistance and high intensity.

Description

technical field [0001] The invention relates to a preparation method of an aluminum-based powder metallurgy part with a densified surface. Background technique [0002] Powder metallurgy is a process technology for producing metal powder or using metal powder (or a mixture of metal powder and non-metal powder) as raw material, forming and sintering to manufacture metal materials, composite materials and various types of products. The powder metallurgy method has similarities with the production of ceramics, and both belong to the powder sintering technology. Therefore, a series of new powder metallurgy technologies can also be used for the preparation of ceramic materials. Due to the advantages of powder metallurgy technology, it has become the key to solve the problems of new materials and plays a pivotal role in the development of new materials. Powder metallurgy parts are widely used in automobiles, home appliances, etc. due to their advantages of saving raw materials, e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/18C22C21/16C22C21/14C22C21/12C22C21/10C22C21/08C22C21/06C22C21/02C22C21/00B22F3/16
CPCB22F3/16B22F3/168C22C21/00C22C21/02C22C21/06C22C21/08C22C21/10C22C21/12C22C21/14C22C21/16C22C21/18
Inventor 朱锋包崇玺王劲松詹学救孙华苗
Owner NBTM NEW MATERIALS GRP
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