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Powder metallurgy aluminum base material and preparation method thereof

An aluminum-based material and powder metallurgy technology, applied in the field of powder metallurgy, can solve problems such as hindering mass production and sintering deformation, and achieve the effects of avoiding sintering deformation, low cost and improving mechanical properties

Active Publication Date: 2019-09-10
NBTM NEW MATERIALS GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the characteristics of aluminum alloy liquid phase sintering lead to serious sintering deformation. At present, mold design is commonly used in the field of powder metallurgy to solve the problem of sintering deformation; however, the sintering deformation of aluminum alloy has inhomogeneity and randomness, which is difficult to eliminate through mold design.
Sintering deformation is one of the key technical problems of powder metallurgy aluminum-based materials, which seriously hinders its mass production

Method used

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  • Powder metallurgy aluminum base material and preparation method thereof
  • Powder metallurgy aluminum base material and preparation method thereof
  • Powder metallurgy aluminum base material and preparation method thereof

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Embodiment 1

[0030] In this embodiment, taking the pure aluminum matrix as an example, the preparation method of the powder metallurgy aluminum-based material is described, which specifically includes the following steps:

[0031] (1) Powder mixing: the aluminum elemental powder with an average particle size of 60 μm and the calcium hydride powder with an average particle size of 45 μm are uniformly ground and mixed with a mortar to obtain a raw material powder, wherein the mass fraction of the calcium hydride powder in the raw material powder is 0.05 %, the balance is aluminum elemental powder. The calcium hydride powder used in this step may preferably have a purity of 99%.

[0032] (2) Forming: The powder obtained in step (1) is subjected to compression molding, the pressing pressure is 150 MPa, and the holding time is 15 s.

[0033] (3) Sintering: use a tube furnace for sintering, the sintering protective atmosphere is high-purity N2, the sintering temperature is 650°C, the sintering ...

Embodiment 2

[0036] In this embodiment, taking the 2014 aluminum alloy substrate as an example, the preparation method of the powder metallurgy aluminum-based material is described, which specifically includes the following steps:

[0037] (1) Powder mixing: the 2014 aluminum alloy powder with an average particle size of 78 μm and the calcium hydride powder with an average particle size of 10 μm are mixed to obtain a raw material powder, and the raw material powder is ball milled on a planetary ball mill with a rotation speed of 110 r / min for 10 h and mixed evenly. The mass fraction of calcium hydride powder in the raw material powder is 4%, and the balance is 2014 aluminum alloy powder. The calcium hydride powder used in this step preferably has a purity of 92%.

[0038] (2) Forming: Utilize a V-shaped mixer to mix into the powder obtained in step (1) and account for 0.5wt% zinc stearate as a lubricant as a lubricant in the powder obtained in step (1), after mixing evenly, the powder is m...

Embodiment 3

[0043] In this embodiment, taking the 7039 aluminum alloy substrate as an example, the preparation method of the powder metallurgy aluminum-based material is described, which specifically includes the following steps:

[0044](1) Powder mixing: the 7039 aluminum alloy powder with an average particle size of 45 μm and the calcium hydride powder with an average particle size of 16 μm are mixed to obtain a raw material powder, and the raw material powder is ball milled on a planetary ball mill with a rotation speed of 70 r / min for 6 hours and mixed evenly. The mass fraction of calcium hydride powder in the raw material powder is 0.01%, and the balance is 7039 aluminum alloy powder. The calcium hydride powder used in this step may preferably have a purity of 99%.

[0045] (2) Forming: use a spiral mixer to mix zinc stearate that accounts for 0.8% of the mass fraction of the raw material powder into the powder obtained in step (1) as a lubricant, and after mixing evenly, the powder...

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Abstract

The invention relates to a powder metallurgy aluminum base material, the raw material powder comprises the following components by mass percent: 0.01-10% of calcium hydride powder and balance of aluminum base powder, wherein the aluminum base powder is aluminum elemental powder or aluminum alloy powder or aluminum base composite material powder. The invention further relates to a preparation method for the powder metallurgy aluminum base material; and the method comprises the following steps of (a) mixing powder; (b) forming; (c) sintering; and (d) thermal treatment. The powder metallurgy aluminum base material has a small amount of sintering deformation; and with the advantages of simple process and high production efficiency, the preparation method is suitable for high-volume production.

Description

technical field [0001] The invention relates to the field of powder metallurgy, in particular to a powder metallurgy aluminum-based material and a preparation method thereof. Background technique [0002] Aluminum alloy is a light material with low density and high specific strength. After aluminum alloy replaces iron-based and copper-based parts, it is beneficial to reduce self-weight, energy saving and emission reduction. Aluminum alloy is used in aerospace, automobile, machinery manufacturing, shipbuilding, and chemical industries. and other fields have been widely used. For example, beams of supersonic fighter jets, high-pressure cylinders, automotive cantilever components, engine blades, casings and cylinder liners, automotive engine and gearbox parts, etc. are widely used in aluminum alloy. However, many parts not only require light weight and good mechanical properties, such as hardness, strength, wear resistance, thermal expansion coefficient, high temperature mecha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/11C22C21/00
CPCB22F1/0003B22F3/1125C22C21/00B22F2998/10B22F2009/043B22F2003/023B22F3/02B22F3/1021B22F2003/248
Inventor 颜巍巍秦晓冬杨浩包崇玺
Owner NBTM NEW MATERIALS GRP
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