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Composite structure alumina/alumina-zirconia layered composite material and preparation method

A layered composite material, alumina layer technology, applied in layered products and other directions, can solve problems such as difficulty in preparation, and achieve the effects of simple preparation process, high surface hardness and excellent mechanical properties

Active Publication Date: 2015-08-26
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still great difficulties in the preparation of large-volume nano-ceramics, and nano-ceramic composite materials with micro-nano composite structures are currently the closest to industrialized nano-ceramics.

Method used

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  • Composite structure alumina/alumina-zirconia layered composite material and preparation method
  • Composite structure alumina/alumina-zirconia layered composite material and preparation method
  • Composite structure alumina/alumina-zirconia layered composite material and preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Ball mill 50 grams of alumina, 10 grams of zirconia, 2.5 grams of titanium oxide and 0.5 grams of copper oxide with a particle size range of 100-200 mesh in an alcohol medium for 24 hours to obtain alumina-zirconia mixed powder; 50 grams of alumina, 2 grams of titanium oxide and 0.5 grams of copper oxide were ball-milled in an alcohol medium for 24 hours to obtain alumina mixed powder. Alternate layers of ball-milled alumina and alumina-zirconia powders are laid in graphite molds with a layer thickness of 0.5mm, put into a hot-press furnace for sintering, the heating rate is 15°C / min, and the sintering temperature is 1350°C , the sintering pressure is 25MPa, the sintering time is 100 minutes, and the whole sintering process is carried out under the protection of argon. According to X-ray diffraction and SEM analysis of the finally obtained sintered sample, the phase composition is mainly α-alumina and tetragonal zirconia, and there is a small amount of monoclinic zircon...

Embodiment 2

[0020] Mill 50 grams of alumina, 5 grams of zirconia, 2 grams of titanium oxide and 0.5 grams of copper oxide with a particle size ranging from 100 to 200 meshes in an alcohol medium for 24 hours to obtain alumina-zirconia mixed powder. 50 grams of alumina, 2 grams of titanium oxide and 0.5 grams of copper oxide were ball-milled in an alcoholic medium for 24 hours to obtain a mixed alumina powder, and the ball-milled alumina and alumina-zirconia powder were laid alternately in a graphite mold. The layer thickness is 1.5mm, put it into a hot-press furnace for sintering, the heating rate is 15°C / min, the sintering temperature is 1350°C, the sintering pressure is 25MPa, and the sintering time is 100 minutes. The whole sintering process is under the protection of argon. conduct. According to X-ray diffraction and SEM analysis of the finally obtained sintered sample, the phase composition is mainly α-alumina and tetragonal zirconia, and there is a small amount of monoclinic zirconi...

Embodiment 3

[0022] Mill 50 grams of alumina, 5 grams of zirconia, 2 grams of titanium oxide and 0.5 grams of copper oxide with particle sizes ranging from 100 to 200 meshes in an alcohol medium for 24 hours to obtain alumina-zirconia mixed powder; mix 100 to 200 meshes 50 grams of alumina, 2 grams of titanium oxide and 0.5 grams of copper oxide were ball-milled in an alcohol medium for 24 hours to obtain alumina mixed powder. Alternate layers of ball-milled alumina and alumina-zirconia powders are laid in a graphite mold, the layer thickness of the alumina layer is 0.5mm, and the layer thickness of the alumina-zirconia layer is 0.8mm, and placed in a hot-press furnace For medium sintering, the heating rate is 15°C / min, the sintering temperature is 1350°C, the sintering pressure is 25MPa, and the sintering time is 100 minutes. The whole sintering process is carried out under the protection of argon. The final obtained sintered sample is analyzed by X-ray diffraction and SEM. The phase comp...

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Abstract

The invention discloses an alumina / alumina-zirconia laminar composite with a composite structure and a preparation method thereof. The laminar composite is composed of an alumina layer and an alumina-zirconia layer, wherein the thickness of the alumina layer and the alumina-zirconia layer can be adjusted at will, the ratio of the thickness of the alumina layer to the thickness of the alumina-zirconia layer can be adjusted at will, a surface layer is alumina, phase composition of the composite is alpha-alumina and tetragonal-phase zirconia, and the composite has a micro-nano composite structure. According to the invention, the alumina / alumina-zirconia laminar composite with the micro-nano composite structure and excellent comprehensive properties like high density, high purity, high rupture work, high surface hardness and controllable bending strength can be prepared by using a simple layering / in-situ hot pressing process at a low temperature with alumina and zirconia powders as raw materials.

Description

technical field [0001] The invention relates to a high-performance ceramic composite material and a preparation method, in particular to a micro-nano composite structure alumina / alumina-zirconia layered composite material prepared by layering / in-situ hot pressing and a preparation method. Background technique [0002] The emergence of biomimetic structural ceramics provides a new research and design idea for the strengthening and toughening of ceramic materials. By designing the shell-like layered structure of ceramic materials, advanced structural ceramics with high strength and toughness can be obtained (Clegg W J, Kendall K, Alford N M, et al. A simple way to make tough ceramics. Nature, 1990, 347: 455). Especially in recent years, the gradual and in-depth research on nano-ceramics has brought new hope to the development and application of ceramic materials. However, there are still great difficulties in the preparation of large-volume nano-ceramics, and nano-ceramic com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B9/00C04B35/10C04B35/622
Inventor 张永胜齐亚娥胡丽天
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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