Method for preparing zirconia-alumina composite material by way of zirconia-alumina-carbon oxidation

A technology of zirconia and carbon oxidation, which is applied in the field of preparation of high-performance composite ceramic materials, and can solve the problems of impracticality of nanocrystalline or ultrafine-crystalline composite materials

Inactive Publication Date: 2010-09-08
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

This method uses ZrAl 4 C 4 、Zr 2 al 3 C 4 、Zr 3 al 3 C 5 、Zr 2 al 4 C 5 and Zr 3 al 4 C 6 Zirconia-alumina (ZrO 2 -Al 2 o 3 ) Nanocrystalline or ultrafine-crystalline composite phase materials, solving the problem of zirconia-alumina (ZrO 2 -Al 2 o 3 ) Nanocrystalline or ultrafine-crystalline composite materials are not practical and other issues

Method used

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  • Method for preparing zirconia-alumina composite material by way of zirconia-alumina-carbon oxidation
  • Method for preparing zirconia-alumina composite material by way of zirconia-alumina-carbon oxidation
  • Method for preparing zirconia-alumina composite material by way of zirconia-alumina-carbon oxidation

Examples

Experimental program
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Effect test

Embodiment 1

[0022] The raw material is Zr with a particle size of about 200 mesh 3 Al 3 C 5 10 grams of powder, ball milled for 5 hours, in-situ oxidation reaction in an air furnace at a heating rate of 10°C / min to 900°C-1500°C for 5 minutes to prepare ZrO 2 -Al 2 o 3 Composite powder, powder particle size 0.1-10μm, ZrO 2 and Al 2 o 3 Homogeneous mixing at the nanoscale. ZrO in the resulting composite nanopowder 2 and Al 2 o 3 The stoichiometric ratio is ZrO 2 :Al 2 o 3 =2:1. The corresponding X-ray diffraction pattern is attached figure 1 given in.

Embodiment 2

[0024]The raw material is Zr with a particle size of about 400 mesh 2 Al 3 C 4 Powder 20 grams, ball milled for 20 hours, in-situ oxidation reaction in an air furnace at a heating rate of 2°C / min to 1000°C for 20 hours to prepare ZrO 2 -Al 2 o 3 Composite powder, powder particle size 0.1-10μm, ZrO 2 and Al 2 o 3 Homogeneous mixing at the nanoscale. ZrO in the resulting composite nanopowder 2 and Al 2 o 3 The stoichiometric ratio is ZrO 2 : Al 2 o 3 =2:1.5. The corresponding X-ray diffraction patterns are listed in the attached figure 2 (a) on.

Embodiment 3

[0026] The multi-phase powder obtained in Example 2 was cold-pressed into a cake under a pressure of 10 MPa, and the cold-pressing time was 5 minutes. / min heating rate increased to 1100 ℃ in situ reaction hot pressing for 1 hour, the hot pressing pressure was 40MPa, the obtained ZrO 2 -Al 2 o 3 Nano-composite materials, the size of the composite ceramic bulk material is Φ25mm×10mm, and the average grain size of the material is 30nm. The corresponding X-ray diffraction patterns are listed in the attached figure 2 (b), the TEM pictures are listed in the attached image 3 above, the density and hardness values ​​are listed in the attached Figure 5 superior.

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Abstract

The invention relates to a preparation method for high-performance composite ceramic material, in particular to a method for preparing a zirconia-alumina nano-grained or ultrafine-grained composite material by oxidating ternary zirconia-alumina-carbon compound in situ. The invention solves the problem that the zirconia/alumina nano-grained or ultrafine-grained composite material prepared by the prior part is not practical. Firstly, synthetic zirconia-alumina-carbon ceramic powder is adopted as material, and is ball-milled, heated to 700 DEG C to 1500 DEG C in the air and oxidated in situ for 0 to 100 hours, so that zirconia-alumina composite powder with uniformly mixed nanoscale is prepared; then, the zirconia-alumina composite powder is cold-pressed to form a cake, which is loaded into a graphite mould, the cake is heated to 1000 DEG C to 1600 DEG C and hot-pressed in situ in a hot-pressing furnace filled with inert gas as protective gas (or under vacuum) for 0.5 to 4 hours, and the hot-pressing pressure is 20MPa to 40MPa. The method can synthesize the zirconia-alumina nano-grained or ultrafine-grained composite material under the relatively low temperature and in a short time, and the material prepared by the method can be used as a structural ceramic part and bioremediation alternative material.

Description

technical field [0001] The invention relates to the preparation technology of high-performance composite ceramic materials, and particularly provides a method for preparing zirconia-alumina (ZrO 2 -Al 2 o 3 ) method for nanocrystalline or ultrafine-crystalline composite materials. Background technique [0002] Zirconia-alumina (ZrO 2 -Al 2 o 3 ) Nanocrystalline or ultrafine-grained composite material is a kind of ceramic composite material with broad application prospects. It combines the advantages of high hardness, high modulus, high strength, high toughness, corrosion resistance, low thermal conductivity, and excellent biocompatibility. It has broad application prospects in high-tech fields such as industrial structural parts, thermal barrier coatings and artificial bioremediation alternative materials. Although zirconia-alumina (ZrO 2 -Al 2 o 3 ) Nanocrystalline or ultrafine-crystalline composite materials have such excellent properties, but the difficulty in p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/48C04B35/622
Inventor 周延春何灵峰包亦望
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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