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Activated sintering method of aluminum or aluminum alloy

A technology of activated sintering and aluminum alloy, which is applied in metal processing equipment, transportation and packaging, etc. It can solve the problems of residual sintering, poor surface layer, high equipment requirements, etc., and achieve the effect of improving sinterability, simple process and enhancing material transfer

Active Publication Date: 2017-05-10
NBTM NEW MATERIALS GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have high requirements on equipment, and the surface of sintered parts often has a poorly sintered surface layer.

Method used

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  • Activated sintering method of aluminum or aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In this embodiment, pure aluminum is taken as an example to illustrate the activation sintering method of aluminum or aluminum alloy, which specifically includes the following steps:

[0031] (1) Preparation of mixed salt powder

[0032] With deionized water as solvent, under the action of heating and magnetic stirring, LiCl, KCl, K 2 ZrF 6 Mixed salt solutions with mass fractions of 20%, 4%, and 1.5% were stirred evenly and fully dried at 60°C to obtain mixed salt powder;

[0033] (2) Surface modification of aluminum powder

[0034] Disperse a certain quality of the above mixed salt powder in absolute ethanol, and the weight ratio of the mixed salt powder to absolute ethanol is 1:40, fully dissolve the added mixed salt powder under magnetic stirring, and then add a certain quality of aluminum powder, so that the mass ratio of the mixed salt mass to the aluminum powder is 0.01, continue to stir for 90 minutes, and then fully dry at 50°C to obtain a surface-modified r...

Embodiment 2

[0040] This embodiment takes 2014 aluminum alloy parts as an example to illustrate the activation sintering method of aluminum or aluminum alloy, which specifically includes the following steps:

[0041] (1) Preparation of mixed salt solution

[0042] With deionized water as solvent, under the action of heating and magnetic stirring, LiCl, KCl, K 2 ZrF 6 For mixed solutions with mass fractions of 12%, 2%, and 1%, respectively, after the three powders are fully dissolved, continue heating and stirring for 5 minutes and then stop;

[0043] (2) Surface modification of 2014 aluminum alloy powder

[0044] Add a certain mass of 2014 aluminum alloy powder to the above mixed salt solution, the mass ratio of the above mixed salt to it is 0.001, fully disperse the added powder under magnetic stirring, continue stirring for 60 minutes, and then fully dry at 60°C to obtain surface modification 2014 aluminum alloy powder;

[0045] (3) Forming

[0046] Using a V-shaped mixer, mix 0.5wt...

Embodiment 3

[0050] In this embodiment, taking 6061 aluminum alloy as an example, the activated sintering method of aluminum or aluminum alloy is described, which specifically includes the following steps:

[0051] (1) Preparation of mixed salt solution

[0052] With deionized water as solvent, under the action of heating and magnetic stirring, LiCl, KCl, K 2 ZrF 6 Mixed solutions with mass fractions of 18%, 5%, and 0.1%, respectively, after the three powders are fully dissolved, continue heating and stirring for 8 minutes and then stop;

[0053] (2) Surface modification of 6061 aluminum alloy powder

[0054] Add a certain mass of 6061 aluminum alloy powder to the above mixed salt solution, the mass ratio of the above mixed salt to it is 0.008, fully disperse the added powder under magnetic stirring, continue stirring for 60 minutes, and then fully dry at 50°C to obtain surface modification 6061 aluminum alloy powder;

[0055] (3) Forming

[0056] Using a ball mill, mix 1.5wt% zinc st...

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Abstract

The invention relates to an activated sintering method of aluminum or aluminum alloy. Mixed salt capable of generating an activating reaction with oxidation films on the surface of aluminum powder or aluminum alloy powder is prepared in advance before aluminum or aluminum alloy part forming and fully mixed with the aluminum powder or the aluminum alloy powder; when sintering is conducted, a uniform mixture of LiCl, KCl and K2ZrF6 is melted to react with oxides on the surfaces of aluminum powder or aluminum alloy powder particles at the temperature of 560 DEG C to 620 DEG C, so that the oxidation films are expanded, crinkled, broken, integrally loosened and stripped by being influenced by liquid phase flowing, then the oxidation films are effectively removed, and substrates of the aluminum particles are exposed outside; substance transmission can be enhanced through the exposed oxidation-free surfaces, metallurgical bonding can be achieved among the powder particles, the sinterability of the aluminum or aluminum alloy is greatly improved, and the physical property and the mechanical property of a sintered part are improved. According to the sintering method, the processes are simple, ordinary powder metallurgy equipment is needed, the universality is achieved, and large-scale production and popularization are promoted.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy of aluminum or aluminum alloy, in particular to the technical field of a sintering method capable of breaking the oxide film on the surface of aluminum powder particles, and specifically refers to an activated sintering method of aluminum or aluminum alloy. Background technique [0002] Powder metallurgy is an environmentally friendly mass production technology with energy saving, material saving, excellent performance, high product precision and good stability. The problem of oxide film on the surface of aluminum particles. 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 widel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/10B22F1/00
CPCB22F3/1003B22F3/1007B22F2999/00B22F1/14B22F1/10B22F2201/02
Inventor 颜巍巍包崇玺秦晓东
Owner NBTM NEW MATERIALS GRP
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