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Nano AlN particle reinforced mixed crystal heat-resistant aluminum-based composite material and preparation method

A technology of particle reinforcement and composite materials, applied in the field of composite materials, can solve the problems of low plasticity of materials, and achieve the effects of high comprehensive mechanical properties, good wettability, and high purity

Active Publication Date: 2019-12-20
NANJING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the existence of a single fine grain, the plasticity of the material is extremely low

Method used

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  • Nano AlN particle reinforced mixed crystal heat-resistant aluminum-based composite material and preparation method
  • Nano AlN particle reinforced mixed crystal heat-resistant aluminum-based composite material and preparation method
  • Nano AlN particle reinforced mixed crystal heat-resistant aluminum-based composite material and preparation method

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preparation example Construction

[0031] The invention provides an AlN particle-reinforced aluminum-based mixed crystal composite material with excellent comprehensive performance, and proposes a preparation method with simple process and suitable for industrial production. The present invention uses industrial pure aluminum powder and magnesium nitride powder as raw materials, and adopts the method of low-temperature sintering, heat treatment and deformation to prepare a high-strength, high-toughness, heat-resistant AlN-reinforced aluminum-based mixed crystal composite material. The boundaries and grains contain a large number of in-situ self-generated AlN reinforced particles. At the same time, the magnesium element is solid-dissolved in the matrix around the AlN-reinforced particles. The elements are fine grained, and the AlN-enhanced grain-poor zone is mainly coarse grained. The mass percentage of AlN in the composite material is 0.80-12.30, and the size is 10nm-300nm; the mass percentage of Mg element is ...

Embodiment 1

[0040] Step 1, pretreatment: Prepare the required raw materials according to the following mass percentages: 97.15% of aluminum powder with a particle size of ≤50μm, 2.50% of magnesium nitride powder with a particle size of ≤2μm, and 0.35% of activated carbon with a particle size of ≤3μm, wherein activated carbon is the active agent; the prepared Aluminum powder, magnesium nitride powder and activated carbon are mixed and then degassed and wrapped.

[0041] Step 2, sintering treatment: under the protective atmosphere of oxygen barrier and argon gas, hot isostatic pressing sintering is carried out on the degassed raw materials; the pressure condition is 100MPa, the sintering temperature is 620°C, and the sintering time is 6h;

[0042] Step 3, solution treatment: place the sintered block in a heat treatment furnace for solution treatment; the solution temperature is 300°C, the solution time is 2 hours, and the solution medium is water;

[0043] Step 4, forming treatment: put the...

Embodiment 2

[0045] Step 1, pretreatment: Prepare the required raw materials according to the following mass percentages: 89.50 of aluminum powder with a particle size of ≤50 μm, 10.00 of magnesium nitride powder with a particle size of ≤2 μm, and 0.50 of activated carbon with a particle size of ≤3 μm, wherein activated carbon is the active agent; the prepared Aluminum powder, magnesium nitride powder and activated carbon are mixed and then degassed and wrapped.

[0046] Step 2, sintering treatment: under the protective atmosphere of oxygen barrier and argon gas, hot isostatic pressing sintering is carried out on the degassed raw materials; the pressure condition is 150MPa, the sintering temperature is 550°C, and the sintering time is 10h;

[0047] Step 3, solution treatment: place the sintered block in a heat treatment furnace for solution treatment; the solution temperature is 330°C, the solution time is 3 hours, and the solution medium is water;

[0048] Step 4, forming treatment: put t...

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Abstract

The invention belongs to the field of metal materials, and relates to a high-strength and high-toughness heat-resistant AlN particle reinforced aluminum-based mixed crystal composite material and a preparation method thereof. The material takes aluminum as a substrate, two kinds of aluminum grains with different refining degrees and different hardness are constructed in situ in the aluminum substrate, the ingredients in the coarse crystal are essentially industrial pure aluminum, in the fine-grain region, aluminum-magnesium alloy and AlN nanoparticles with magnesium elements are subjected to solid solution, the mass percentage of Mg element is 0.72%-10.80%, the mass percentage of AlN is 0.80%-12.3%, and the size is 10nm-300nm. Significant back stress strengthening is generated between thesoft and hard grains, and the high-strength and high-toughness heat-resistant aluminum-based composite material is obtained in combination with the synergistic effect of the self-generated AlN nanoparticles. According to the nano AlN particle reinforced mixed crystal heat-resistant aluminum-based composite material and the preparation method, the composite material is excellent in comprehensive performance, has good industrial application prospect, by combining the solid solution strengthening of the magnesium and the synergistic effect of the AlN nanoparticles, the high-strength and high-toughness heat-resistant aluminum-based composite material is obtained.

Description

technical field [0001] The invention belongs to the field of composite materials, and in particular relates to a nano-AlN particle-reinforced mixed-crystal heat-resistant aluminum-based composite material and a preparation method thereof. Background technique [0002] Aluminum and aluminum alloys have excellent comprehensive properties, such as good corrosion resistance, good plasticity and processability. In addition, aluminum alloy materials also have good high temperature performance, formability, machinability, riveting performance and surface treatment performance. Therefore, aluminum has been widely used in various fields such as aerospace, navigation, aviation, automobiles, transportation, bridges, construction, electronics, energy and power, metallurgy and chemical industry, agricultural drainage and irrigation, machinery manufacturing, packaging anticorrosion, electrical furniture, daily style and so on. Very wide range of applications. The tensile strength of ind...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C1/10C22C21/06C22C21/00C22C32/00
CPCC22C1/058C22C21/00C22C21/06C22C32/0068
Inventor 聂金凤陆峰华刘相法
Owner NANJING UNIV OF SCI & TECH
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