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High-temperature-resistant AlN and Al2O3 co-reinforced aluminum-base composite material and method for preparing same

An aluminum-based composite material and high-temperature-resistant technology, applied in the field of metal-based composite materials, can solve the problems of melting, high cost, powder agglomeration, etc., and achieve the effect of increasing the surface alumina content, improving production efficiency, and ensuring repeatability

Active Publication Date: 2019-03-01
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large amount of heat generated during the nitriding of aluminum powder, the powder will form agglomerates or even melt, resulting in uncontrollable billet quality and affecting the regulation of the number of nitrides. Therefore, it is necessary to control the nitrogen content and flow rate in the tube furnace, and add tin element suppress
This method is costly and complicated, and it is difficult to prepare large-scale batches

Method used

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  • High-temperature-resistant AlN and Al2O3 co-reinforced aluminum-base composite material and method for preparing same

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Select 10 kg of spherical aluminum powder with an average particle size of 2.5 microns, put it into a cylindrical steel mold with an inner diameter of 130 mm after cold isostatic pressing, and drill 15 round holes with a diameter of 1 mm at each end after sealing. Place in an air furnace at 400°C for 4 hours, then raise the temperature to 600°C for 5 hours, then take out the mold directly, and use a press to pressurize to 100T to complete sintering. The sintered ingot was hot extruded at 450°C with an extrusion ratio of 16:1. The extruded round bar was annealed at 450°C for 8 hours to obtain the final profile. The microscopic transmission photos of the material are shown in figure 1 .

[0030] The high temperature (AlN+Al 2 o 3 ) / Al composite material was sampled at different locations, and the tensile strength at room temperature was 260-300MPa. The tensile strength at 375°C is 120-130MPa. After high-temperature annealing at 600°C for 12 hours, the strength at roo...

Embodiment 2

[0041] Select 1000g of spherical aluminum powder with an average particle size of 2.5 microns, cold isostatically press to a density of 85%, take out the ingot, place it in an air furnace at 350°C for heating and heat preservation for 10 hours, then raise the temperature to 580°C for 2 hours, and place it to cool to After room temperature, extrusion molding is carried out at 500°C, with an extrusion ratio of 9:1. The extruded strip was annealed at 450°C for 8 hours to obtain the final material.

[0042] The high temperature (AlN+Al 2 o 3 ) / Al composite material at room temperature tensile strength 280MPa. The tensile strength is 123MPa at 375°C. After 12h high-temperature annealing at 600°C, the strength of the composite material at room temperature can still reach 270MPa, and the tensile strength at 375°C can reach 116MPa.

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Abstract

The invention discloses a high-temperature-resistant AlN and Al2O3 co-reinforced aluminum-base composite material and a method for preparing the same, and belongs to the technical field of metal-basecomposite materials. The method includes compressing superfine aluminum powder until the porosity of the superfine aluminum powder is appropriate, loading the superfine aluminum powder in jackets, sealing the jackets and drilling the peripheries of the jackets to allow an appropriate quantity air to flow into the jackets; placing the jackets in air furnaces, heating the jackets at the low temperatures and thickening oxidation films; increasing the temperatures until the temperatures reach the high temperatures, generating AlN and Al2O3 from nitrogen and oxygen in the air, sintering powder treated at the high temperatures, and carrying out heat processing on the powder to obtain the high-temperature-resistant AlN and Al2O3 co-reinforced aluminum-base composite material which is an (AlN+Al2O3) / Al composite material with excellent high-temperature strength and heat resistance. The high-temperature-resistant AlN and Al2O3 co-reinforced aluminum-base composite material and the method have the advantages that the air is used as oxygen and nitrogen sources, and complicated equipment can be omitted; risks such as aluminum powder combustion can be prevented, the quantities of oxide and nitride can be easily regulated and controlled, and the high-temperature-resistant AlN and Al2O3 co-reinforced aluminum-base composite material and the method are short in period, low in cost, easy to control and suitable for large-scale industrial preparation.

Description

technical field [0001] The invention relates to the technical field of metal matrix composite materials, in particular to a high temperature resistant AlN and Al 2 o 3 Co-reinforced aluminum matrix composites and methods for their preparation. Background technique [0002] Aluminum (alloy) and its composite materials have been widely used in aerospace, transportation and other fields due to their low density, high thermal conductivity, low price and good corrosion resistance. After decades of research, traditional high-strength aluminum alloys have excellent mechanical properties at room temperature, but when the temperature reaches 150°C, the precipitates in it begin to grow, coarsen, and even dissolve, so the high-temperature strength of aluminum alloys and their composites bad. In recent years, people have devoted themselves to the development of heat-resistant aluminum, and strive to realize the long-term use of aluminum-based materials at 300 ° C to replace the curre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/10C22C1/05C22C21/00
Inventor 马宗义昝宇宁肖伯律王全兆王东倪丁瑞
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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