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Nano-crystalline NiAl-Al2O3-Y composite material and preparation method thereof

A composite material and nanocrystalline technology, which is applied in the field of nanocrystalline NiAl-Al2O3-Y composite material and its preparation, can solve the problems of reducing the oxidation resistance of NiAl and limiting its application

Inactive Publication Date: 2011-02-23
谭丽霞 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of oxides will partially reduce the oxidation resistance of NiAl, thus limiting its application to a certain extent.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0006] 1. Mechanical alloying

[0007] Preparation of NiAl-Al by High Energy Ball Mill 2 o 3 In situ composite powder.

[0008] Select the nickel and aluminum element powders whose purity and particle size are 99.9% and 300 mesh respectively. According to the nominal ratio NiAl-(5~15)vol.%Al 2 o 3 Weigh nickel powder and aluminum powder and mix well. Then measure absolute ethanol according to 3-5% of the mass fraction of the mixed powder; add the prepared mixed powder and the measured absolute ethanol into the stirring high-energy ball mill, and the ball mill tank is cooled by circulating water. Ball mill under the condition of 250-280r / min. After 2 hours of ball milling, open the ball mill tank, let in air, and continue ball milling in the air atmosphere for 20 hours, and the mechanical alloying is completed. Obtain fully alloyed and grain-refined NiAl-Al 2 o 3 In situ composite material powder, Al in powder 2 o 3 The content varies according to the content of nicke...

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PUM

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Abstract

The invention relates to a nano-crystalline NiAl-Al2O3-Y composite material and a preparation method thereof. The material consists of NiAl, 5-15vol.% Al2O3 and rare earth element Y. The added amount of Y is 0.05 to 0.5 percent of the mass percent of the NiAl-Al2O3. By adding the rare earth element Y into the NiAl-Al2O3, the mechanical property and the high-temperature antioxidation performance of the material can be well balanced. The room temperature compressive strength of the material is more than 1,800MPa (which is changed according to different Al2O3 contents), the room temperature compressive plasticity is over 13 percent (which is changed according to different Al2O3 contents), the high-temperature strength (1,200 DEG C) is more than 110MPa (which is changed according to different Al2O3 contents), and the fracture toughness is more than 8.2MPa.m1 / 2 (which is changed according to different Al2O3 contents). The material has high oxidation resistance, and the test results of cyclic oxidation at 700 to 1,200 DEG C and constant-temperature oxidation show that oxide skins have no cracks and flaking, and the oxidation weight gain is less than 1.5 mg / cm<2>.

Description

technical field [0001] The invention relates to a nanocrystalline NiAl-Al 2 o 3 -Y composite material and preparation method thereof Background technique [0002] The development of aerospace technology has put forward higher requirements on the service temperature of materials, and the commonly used nickel-based superalloys have reached the limit of their service temperature (0.8T m ), so it is imperative to develop its alternative materials. Due to the advantages of high melting point, low density and good oxidation resistance, NiAl intermetallic compounds have attracted extensive attention in recent years and are expected to be widely used in the aerospace field. However, low high-temperature strength and low creep resistance limit the practical application of NiAl. In order to improve its comprehensive performance, a series of researches have been carried out at home and abroad in recent years. Among them, adding oxides to NiAl, through the grain refinement brought ...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22C19/00C22C32/00
Inventor 谭丽霞谭娟
Owner 谭丽霞