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Preparation method for powder metallurgy high-strength copper aluminum materials

A powder metallurgy, copper-aluminum alloy technology, applied in the field of powder metallurgy materials, can solve the problems of restricting development and application, hindering powder sintering, and sample expansion, etc., and achieves the effects of uniform and small pores, reduced oxides, and uniform structure.

Inactive Publication Date: 2019-04-23
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The strength of Cu-Al alloy prepared by powder metallurgy method is low at present, because aluminum (Al) powder is preferentially oxidized during sintering, forming a strong oxide coating film, which will hinder the sintering between powders; and the sample occurs during sintering Expansion makes sintering difficult to control, which limits its development and application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1) Add 11-13% pure Al powder to pure Cu powder, the pure aluminum powder is -300 mesh gas atomized powder, and the pure copper powder is -300 mesh electrolytic powder. (2) Mix the metal raw materials with the mixer at a speed of 30-80r / min for 1-2h. (3) Uniaxial compaction in a split steel mold with a pressure of 500 MPa and a holding time of 1 min to prepare a compact. (4) The formed body is sintered in a tubular sintering furnace, using H 2 Protection, heat preservation at a heating rate of 5°C / min to 380°C for 1 hour, then heat preservation at 5°C / min to 660°C for 1 hour, and finally heat preservation at 5°C / min to 980-1010°C for 2 hours, and heat at 5-10°C after sintering / min is cooled to normal temperature to obtain the copper-aluminum alloy.

Embodiment 2

[0016] (1) Add 11-13% pure Al powder to pure Cu powder, the pure aluminum powder is -300 mesh gas atomized powder, and the pure copper powder is -300 mesh electrolytic powder. (2) Mix the metal raw materials with the mixer at a speed of 30-80r / min for 1-2h. (3) Uniaxial compaction in a split steel mold with a pressure of 300 MPa and a holding time of 1 min to prepare a green compact. (4) The formed body is sintered in a tubular sintering furnace, using H 2 Protection, heat preservation at a heating rate of 5°C / min to 380°C for 1 hour, then heat preservation at 5°C / min to 660°C for 1 hour, and finally heat preservation at 5°C / min to 980-1010°C for 2 hours, and heat at 5-10°C after sintering / min is cooled to normal temperature to obtain the copper-aluminum alloy.

Embodiment 3

[0018] (1) Add 11-13% pure Al powder to pure Cu powder, the pure aluminum powder is -500 mesh gas atomized powder, and the pure copper powder is -500 mesh electrolytic powder. (2) Mix the metal raw materials with the mixer at a speed of 30-80r / min for 1-2h. (3) Uniaxial compaction in a split steel mold with a pressure of 500 MPa and a holding time of 1 min to prepare a compact. (4) The formed body is sintered in a tubular sintering furnace, using H 2 Protection, heat preservation at a heating rate of 5°C / min to 380°C for 1 hour, then heat preservation at 5°C / min to 660°C for 1 hour, and finally heat preservation at 5°C / min to 980-1010°C for 2 hours, and heat at 5-10°C after sintering / min is cooled to normal temperature to obtain the copper-aluminum alloy.

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Abstract

The invention discloses a preparation method for powder metallurgy high-strength copper aluminum materials, and belongs to the field of powder metallurgy. Copper aluminum alloys comprise components of11-13% of Al and 87-89% of Cu; materials are mixed by a mixer by 1-2 h at a speed of 30-80 r / min; pressing blanks are prepared in a split steel mold; and formed blanks are sintered, are protected byadopting H2, are heated to 380 DEG C at a heating speed of 5 DEG C / min for insulation by 0.5-1.5 h, are heated to 660 DEG C at a heating speed of 5 DEG C / min for insulation by 0.5-1.5 h, are finally heated to 980-1010 DEG C at a heating speed of 5 DEG C / min for insulation by 1.5-2.5 h, and are cooled to a normal temperature after sintering to obtain copper aluminum alloys. The copper aluminum alloys prepared by the method are uniform in structure; pearlites in the alloys are uniformly laminar without segregating; holes in the alloy structures are uniform, fine and round; oxides in the alloys are reduced, so that the expansion in the sintering process is prevented, and the sintering density can be preferably controlled; and the tensile strength of the prepared sintering samples exceeds 400MPa.

Description

technical field [0001] The invention belongs to the field of powder metallurgy materials, and relates to a method for preparing powder metallurgy materials, in particular to a method for preparing powder metallurgy copper-aluminum alloys. Background technique [0002] Powder metallurgy is a process technology that uses metal powder (or a mixture of metal powder and non-metal powder) as a raw material, after forming and sintering, to manufacture metal material composite materials and various types of products. The advantages of powder metallurgy: firstly, it can avoid the segregation of components, and ensure that the alloy has a uniform structure and stable performance; secondly, it can use the combination effect of metal and metal, metal and non-metal to produce materials with various special properties. Due to the advantages of low density and high specific strength, powder metallurgy aluminum alloy materials have attracted widespread attention in recent years. [0003] A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/02B22F3/10C22C9/01
CPCB22F1/0003B22F3/02B22F3/1007B22F3/1017B22F2999/00C22C9/01B22F2201/013
Inventor 尹海清邓正华张国飞曲选辉
Owner UNIV OF SCI & TECH BEIJING
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