Nanometer Al matrix composite powder and preparation method thereof

An aluminum-based composite material and composite material technology, applied in the field of nano-aluminum-based composite material powder and preparation, can solve the problem of material fatigue strength, plasticity and toughness reduction, which cannot fully meet the requirements of high-performance parts manufacturing, high residual stress cracks and holes To achieve the effects of inhibiting recrystallization growth, high strength and plasticity, and improving mechanical properties

Inactive Publication Date: 2018-08-03
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the prepared parts are prone to high residual stress and defects such as micron-level cracks and holes, which will lead to the reduction of fatigue strength, plasticity and toughness of the material.
Therefore, the p

Method used

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  • Nanometer Al matrix composite powder and preparation method thereof
  • Nanometer Al matrix composite powder and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0041] This embodiment provides a kind of nano-aluminum matrix composite material powder, and its preparation method comprises:

[0042] Pure aluminum, pure Ni or Al-Ni master alloy, Al-12Zr master alloy, Al-Cu master alloy, KBF 4 and K 2 TiF 6 In situ self-generated 5wt.%TiB 2 Reinforced Al-10Ni-2.3Cu-3Zr composites. Put high-purity Al into the crucible to melt and heat up to 780°C, and cover it with JZF-03 high-temperature covering agent; put KBF 4 、K 2 TiF 6 Mix evenly according to the mass ratio of 1:2, dry and add to the melt; after the reaction is finished, take out the reaction by-products, add Al-Ni master alloy, Al-12Zr master alloy, Al-Cu master alloy in turn, Add JZJ type harmless aluminum alloy refining agent to the body for degassing refining, let it stand at 750°C for 15 minutes, and then make powder through a gas atomization device.

[0043] The gas atomization device includes a crucible 2, an atomizer 3, an atomization chamber 4, and a collection bucket ...

Embodiment 2

[0047] This embodiment provides a kind of nano-aluminum matrix composite material powder, and its preparation method comprises:

[0048] Pure aluminum, pure Ni or Al-Ni master alloy, Al-12Zr master alloy, Al-Cu master alloy, Al-Ti master alloy, KBF 4 and K 2 TiF 6 In situ self-generated 5wt.%TiB was formulated for the raw material 2 Reinforced Al-10Ni-2.3Cu-3Zr-5Ti composites. Put high-purity Al into the crucible to melt and heat up to 780°C, and cover it with JZF-03 high-temperature covering agent; put KBF 4 、K 2 TiF 6 After mixing evenly according to the mass ratio of 1:2, dry it and add it to the melt; For Ti master alloy, add JZJ type harmless aluminum alloy refining agent to the melt for degassing and refining, let it stand at 750°C for 15 minutes, and then make powder through a gas atomization device. The gas atomization device is the same as that in Example 1, and the gas atomization process is as follows: the melt temperature is 900° C., He is used for protectio...

Embodiment 3

[0051] This embodiment provides a kind of nano-aluminum matrix composite material powder, and its preparation method comprises:

[0052] Pure aluminum, pure Ni or Al-Ni master alloy, Al-Y master alloy, Al-Ce master alloy, KBF 4 and K 2 TiF 6 In situ self-generated 10wt.%TiB was formulated for the raw material 2 Reinforced Al-15Ni-7Ce-6Y composites. Put high-purity Al into the crucible to melt and heat up to 780°C, and cover it with JZF-03 high-temperature covering agent; put KBF 4 、K 2 TiF 6 Mix evenly according to the mass ratio of 1:2, dry and add to the melt; after the reaction is completed, take out the reaction by-products, and add pure Ni or Al-Ni master alloy, Al-Y master alloy, Al-Ce master alloy in turn , adding JZJ type harmless aluminum alloy refining agent to the melt for degassing refining, standing at 750°C for 15 minutes, and then making powder through a gas atomization device. The gas atomization device is the same as that in Example 1, and the gas atomi...

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Abstract

The invention provides nanometer Al matrix composite powder and a preparation method thereof. The preparation method comprises the following steps: pure Al, a pure Ni or Al-Ni intermediate alloy, an Al-Zr intermediate alloy, an Al-Sc intermediate alloy, an Al-Cu intermediate alloy, an Al-Ti intermediate alloy, an Al-Y intermediate alloy, an Al-Ce intermediate alloy, KBF4 and K2TiF6 are taken as raw materials; an in-situ TiB2 micro-nanometer-particle enhanced nanometer Al matrix composite is prepared by adopting an in-situ melt self-growth control method; and TiB2-particle Al matrix composite powder, namely the nanometer Al matrix composite powder, is prepared through a vacuum gas atomization method, wherein the spherical rate, the yield and the laser absorptivity of the prepared powder arecorrespondingly higher than 90%, higher than and equal to 60%, and higher than 55%. Compared with traditional Al alloy powder, the nanometer Al matrix composite powder provided by the invention has the following beneficial effects: (1) nanometer particles are dispersedly distributed in matrix grains, the thermal stability is higher, and the nanometer Al matrix composite powder is applicable to the powder metallurgy technology; and (2), the laser absorptivity is higher, and the nanometer Al matrix composite powder is more applicable to the laser additive manufacturing technology.

Description

technical field [0001] The invention relates to the technical field of material powder preparation, in particular to a nano-aluminum-based composite material powder and a preparation method. Background technique [0002] High-tech fields such as aerospace and weapon manufacturing have strict requirements on the performance and preparation technology of structural materials, not only requiring high strength and high plasticity, but also high specific stiffness and specific modulus. The pursuit of high performance, high reliability, economy and environmental protection in the field of high-end equipment such as large aircraft has led to an increasingly urgent demand for large, sophisticated and complex overall lightweight, high-strength and tough alloy components. [0003] Laser additive manufacturing technology can solve the technical problems of rapid manufacturing of complex shapes and high-performance metal components. However, commercial metal powder preparation methods s...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F9/08C22C21/00C22C32/00
CPCB22F1/0003B22F9/082C22C21/00C22C21/003C22C32/0073
Inventor 陈哲吴一廉清李险峰王浩伟
Owner SHANGHAI JIAO TONG UNIV
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