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A method for synchronously improving the density and elongation of powder metallurgy materials

A powder metallurgy and synchronous lifting technology, applied in the field of powder metallurgy preparation, can solve the problems of poor performance, only 5%-6%, low density of sintered aluminum alloy, etc., achieve short pressurization time, low equipment requirements, The effect of applying little pressure

Active Publication Date: 2022-03-18
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the early research on powder metallurgy aluminum alloys was limited by the limitations of raw materials and sintering technology. Most of them used powder mixing method + non-pressure liquid phase technology, resulting in low density of sintered aluminum alloy (density ≤ 95%) and poor performance. (tensile strength≤200MPa, elongation only 5%-6%) and other deficiencies

Method used

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  • A method for synchronously improving the density and elongation of powder metallurgy materials
  • A method for synchronously improving the density and elongation of powder metallurgy materials
  • A method for synchronously improving the density and elongation of powder metallurgy materials

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Experimental program
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Effect test

Embodiment 1

[0051] This invention is mainly accomplished through the following steps

[0052] step one

[0053] Weigh 7g of 2024 aluminum alloy atomized alloy powder (appearance is nearly spherical, particle size Dv50=63μm, see Table 1 for composition), and put it into the inner diameter In the pressing mold, the inner wall of the mold is coated with zinc stearate. After the powder loading is completed, uniaxial pressing is carried out, the pressing pressure is 400 MPa, and the holding time is 3 s; the obtained compact has a diameter of 40 mm and a thickness of 2 mm.

[0054] Table 1 Chemical composition of 2024 atomized alloy powder (mass ratio wt.%)

[0055]

[0056] step two

[0057] Assemble the aluminum alloy compact obtained in step 1 into a high-strength graphite mold whose inner wall is sprayed with boron nitride, and then put them together into a vacuum hot-pressing furnace cavity for vacuuming, with a vacuum degree of ≤10 -3 Pa.

[0058] step three

[0059] When the vacu...

example 1

[0060] The sintered aluminum alloy obtained in Example 1 has a relative density of 99.3%, a main alloy element concentration of Cu: 3.3%, Mg: 1.2%, an average tensile strength of 233.8 MPa, and an average elongation of 9.2%.

Embodiment 2

[0062] Step one to step two are consistent with embodiment 1; The difference is:

[0063] step three

[0064] When the vacuum degree of the furnace reaches the standard of step 2, the temperature starts to rise. In the first stage, the temperature is raised from room temperature to 500°C at a rate of 10°C / min, kept for 30 minutes, and a pressure of 15MPa is applied at the same time. Keep the pressure head tight against the body, continue to heat up to 580°C at 5°C / min, and keep warm for 2 hours; after the second stage is completed, cool down to room temperature at 10°C / min.

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Abstract

The invention belongs to the preparation technology of powder metallurgy materials, in particular to a method for synchronously improving the density and elongation of powder metallurgy materials. The specific operation is: press the raw material powder into shape; obtain the compact; put the obtained compact into the graphite mold and put them into the hot-press furnace together, keep the vacuum state of the furnace, and then sinter by the sintering method of low temperature and high pressure + high temperature and low pressure; to get the finished product. The process of the invention is simple, the pressure to be applied is small, the prepared powder metallurgy product has uniform structure, the density is as high as 99%, the loss of main alloy element components is small, the elongation is nearly 100% higher than that of conventional liquid phase sintering, and its comprehensive mechanical properties obtained a significant improvement.

Description

Technical field: [0001] The invention belongs to powder metallurgy preparation technology, in particular to a method for synchronously improving the density and elongation of powder metallurgy materials. Background technique [0002] As an excellent material preparation process, powder metallurgy technology has many advantages that traditional casting processes cannot match, such as near-net shape, strong material structure design, uniform structure and no segregation. The use of powder metallurgy technology to produce aluminum alloys and aluminum-based composite materials can better broaden their applications in aerospace, transportation and other fields, and meet the development needs of lightweight and functional materials in today's society. However, the early research on powder metallurgy aluminum alloys was limited by the limitations of raw materials and sintering technology. Most of them used powder mixing method + non-pressure liquid phase technology, resulting in lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/14C22C1/04C22C21/14C22C21/16C22C21/18C22C23/02
CPCB22F3/14C22C1/0416C22C21/16C22C21/14C22C21/18C22C1/0408C22C23/02B22F2998/10
Inventor 马运柱伍镭刘文胜刘洋王涛刘超刘阳杨伦颜焕元
Owner CENT SOUTH UNIV
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