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Al2O3 ceramic composite material with biomimetic structure and preparation method

A ceramic composite material and composite material technology, which is applied in the field of Al2O3/Mo ceramic composite material and preparation based on bionic structure by hot pressing, can solve problems such as uneven distribution of metal phases and material performance degradation, and achieve controllable mechanical properties, The effect of low cost and excellent high temperature tribological properties

Active Publication Date: 2016-01-13
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, problems such as the uneven distribution of metal phases in the material brought about by traditional preparation methods limit the role of each phase to a large extent, resulting in a decline in material performance.

Method used

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  • Al2O3 ceramic composite material with biomimetic structure and preparation method
  • Al2O3 ceramic composite material with biomimetic structure and preparation method
  • Al2O3 ceramic composite material with biomimetic structure and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Al in the graphite mold 2 o 3 Alternately lay layers with metal Mo powder, the layer thicknesses are controlled at 1mm and 0.25mm respectively, and the total number of layers is 37. After laying up the layers, put them into a hot-press furnace for sintering. The heating rate is 15°C / min, the sintering temperature is 1500°C, the sintering pressure is 30MPa, and the sintering time is 60 minutes. The whole sintering process is carried out under the protection of nitrogen. The final obtained sintered sample was analyzed by X-ray diffraction and SEM, and the phase composition was mainly α-alumina and metal Mo, without other impurity phases, Al 2 o 3 layer and metallic Mo layer are 156 μm and 40 μm thick, respectively, figure 1 for Al 2 o 3 Optical photographs of / Mo layered composites, where the light color is the Mo layer and the dark color is Al 2 o 3 layer. From figure 1 It can be seen that there are no large holes and cracks in the layered composite material, th...

Embodiment 2

[0021] Al in the graphite mold 2 o 3 Alternately lay layers with metal Mo powder, the layer thicknesses are controlled at 1.2mm and 0.1mm respectively, and the total number of layers is 27. After laying up the layers, put them into a hot-press furnace for sintering. The heating rate is 15°C / min, the sintering temperature is 1550°C, the sintering pressure is 25MPa, and the sintering time is 100 minutes. The whole sintering process is carried out under the protection of nitrogen. The final obtained sintered sample was analyzed by X-ray diffraction and SEM, and the phase composition was mainly α-alumina and metal Mo, without other impurity phases, Al 2 o 3 layer and the metallic Mo layer have thicknesses of 191 μm and 17 μm, respectively. According to the performance test of the material, its fracture toughness and bending strength are 480MPa and 5.63MPa m respectively. 1 / 2 , The coefficient of friction when rubbing against zirconia ceramics at 850°C is 0.19.

Embodiment 3

[0023] Al in the graphite mold 2 o 3 Alternately layered with metal Mo powder, the layer thickness is controlled at 2mm and 0.4mm respectively, and the total number of layers is 21 layers. After laying up the layers, put them into a hot-press furnace for sintering. The heating rate is 15°C / min, the sintering temperature is 1550°C, the sintering pressure is 30MPa, and the sintering time is 60 minutes. The whole sintering process is carried out under the protection of nitrogen. The final obtained sintered sample was analyzed by X-ray diffraction and SEM, and the phase composition was mainly α-alumina and metal Mo, without other impurity phases, Al 2 o 3 layer and the metallic Mo layer have thicknesses of 320 μm and 65 μm, respectively. According to the performance test of the material, its fracture toughness and bending strength are 325MPa and 9.14MPa m respectively. 1 / 2 , 800 ℃ and alumina ceramic friction coefficient of friction is 0.25. figure 2 It is the curve of the f...

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Abstract

The invention discloses Al2O3 ceramic composite materials with a bionic structure and a preparation method thereof. The ceramic composite materials are in a multiple layers of structure and are formed by Al2O3 and metal Mo in an alternating overlapping mode, a surface layer is an Al2O3 layer, and a spacer layer is a metal Mo layer. After being alternatively overlapped in a graphite mold, Al2O3 powder and metal Mo powder are directly placed in a hot press furnace for hot pressing and sintering, and the Al2O3 ceramic composite materials are obtained. The Al2O3 ceramic composite materials are controllable in mechanical property (mainly breaking tenacity and bending strength), high in purity, excellent in high-temperature friction performance and capable of being used for lubricating and sealing materials in extremely severe environments (high temperature, corrosion, special atmosphere and the like).

Description

technical field [0001] The invention relates to an energy ceramic composite material and a preparation method thereof, in particular to preparation of Al based on a bionic structure by hot pressing. 2 o 3 / Mo ceramic composite material and preparation method. Background technique [0002] Al 2 o 3 / Metal composite material is expected to have the advantages of both metal and ceramics. It is the most popular new material today, and it is also the 2 o 3 The most promising research direction of ceramic materials. However, problems such as the uneven distribution of metal phases in materials caused by traditional preparation methods limit the function of each phase to a large extent, resulting in a decline in material performance. The emergence of biomimetic structural materials provides a new research and design idea for the strengthening and toughening of ceramic / metal composites. The shell-like layered structure design of ceramic / metal composite materials can obtain hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B15/04B32B9/04B32B37/06B32B37/10
Inventor 张永胜齐亚娥胡丽天
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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