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Method for preparing high-performance aluminum alloy by means of powder injection molding technology

A technology of powder injection molding and injection molding, which is applied in the field of powder metallurgy, can solve the problems of inability to meet the performance requirements of structural materials, high cost of raw material powder, poor mechanical properties, etc., and achieve uniform microstructure, high material utilization rate, and high production efficiency Effect

Active Publication Date: 2018-03-13
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In summary, the current research on aluminum alloy injection molding mainly has the following problems: if pure aluminum powder is used as the main raw material, the density is lower than 96%, and the mechanical properties are poor, which cannot meet the performance requirements of structural materials; The aluminum alloy with pre-alloyed powder as the main raw material, although its density can reach more than 98%, but the cost of the raw material powder is high and the composition is relatively high

Method used

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  • Method for preparing high-performance aluminum alloy by means of powder injection molding technology
  • Method for preparing high-performance aluminum alloy by means of powder injection molding technology
  • Method for preparing high-performance aluminum alloy by means of powder injection molding technology

Examples

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Embodiment 1

[0034] Example 1: Composition Optimization of Injection Molded Aluminum Alloy System

[0035] (a) Ingredients: Mix the designed elements according to the mass percentage (see Table 1) and then dry mix them on the mixer for 2 hours to obtain premixed powder; the binder is a wax-based binder, and each component is Percent paraffin: beeswax: polyethylene wax: low density polyethylene: stearic acid = 24:24:24:24:4 Weighing, the metering accuracy of powder and binder is 0.1g.

[0036] (b) Feed preparation: weigh the mixed powder and the prepared binder according to the loading capacity of 62%, and place them in the CF-1L type powerful pressurized internal mixer according to the steps for mixing. The refining temperature is 170°C, the rotation speed is 30r / min, and the mixture becomes molten after 1.5-2h. After mixing thoroughly, take it out and cool it.

[0037] (c) Injection molding: After the feed material is crushed, it is poured into the cylinder of the CJ80-E injection machin...

Embodiment 2

[0042] Example 2: Composition Optimization of Injection Molding Aluminum Alloy Binder System

[0043] (a) Ingredients: The elements of Al-Mg-Cu-Si-Sn are prepared according to the mass percentage of 91.7:1.5:4.6:2.0:0.2, and then dry-mixed on the mixer for 2 hours to obtain pre-mixed powder; the binder is wax Base binder, each component is weighed according to Table 2 by mass percentage, and the metering accuracy of powder and binder is 0.1g.

[0044] (b) Feed preparation: weigh the mixed powder and the prepared binder according to the loading capacity of 62%, and place them in the CF-1L type powerful pressurized internal mixer according to the steps for mixing. The refining temperature is 170°C, the rotation speed is 30r / min, and the mixture becomes molten after 1.5-2h. After mixing thoroughly, take it out and cool it.

[0045] (c) Injection molding: after crushing the feed material, pour it into the cylinder of CJ80-E injection machine for injection operation, compare the i...

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Abstract

The invention discloses a method for preparing high-performance aluminum alloy by means of a powder injection molding technology and belongs to the technical field of powder injection molding. The technological process provided by the invention comprises the steps that an Al-Cu-MG-Si alloy system serves as the basis, and a small amount of the alloy element Sn is contained; pure aluminum powder serves as the main raw material, the other alloy elements are added in the form of elemental powder or binary alloy powder; the aluminum alloy powder containing specific components is mixed uniformly, then the aluminum alloy powder and a wax-based binder are arranged on a roller mixer for mixing, then injection molding is performed, and an aluminum alloy billet is prepared; and solvent degreasing andthermal debinding are performed, sintering is performed under the high-purity N2 atmosphere, and then an aluminum alloy product is prepared. By controlling the particle size of the raw material powder, optimizing the binder, adding the trace alloy elements, optimizing a sintering system and taking other means, densification sintering of the injection molded aluminum alloy is achieved. The invention provides a technology for preparing high-performance aluminum alloy components in complex shapes at a low cost on a large scale, the density of the prepared aluminum alloy is greater than 98%, andthe tensile strength is greater than or equal to 300 MPa.

Description

technical field [0001] The invention provides a method for preparing high-performance aluminum alloy by using powder injection molding technology, which belongs to the field of powder metallurgy. Background technique [0002] Aluminum alloy has low density, high specific strength, good plasticity, excellent electrical conductivity, thermal conductivity and corrosion resistance, and is widely used in aerospace, power electronics, construction and other industrial fields. In recent years, the demand for high-performance, small and complex-shaped aluminum alloy structural parts has gradually increased in fields such as aerospace, automobiles, and wearable electronic devices. However, the use of mechanical processing technology to prepare small and complex parts has low material utilization and high processing costs, which is not suitable for mass production. However, the ability and precision of the casting process to form complex shapes cannot meet the actual needs, and the u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/22B22F1/00C22F1/057
CPCC22F1/057B22F3/225B22F2999/00B22F1/107B22F2201/02
Inventor 吴茂杜智渊邱婷婷曲选辉
Owner UNIV OF SCI & TECH BEIJING
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