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Method for obtaining texture topography of alumina-based binary eutectic melt growth ceramic

A technology based on binary eutectic and melt growth, which is applied in the field of material processing engineering, can solve problems such as the inability to retain the solid-liquid interface morphology, the difficulty of microstructure, and the difficulty of experimental analysis, so as to make up for the lack of thermal conductivity and improve solid Phase temperature gradient, the effect of increasing the superheat of the melting zone

Active Publication Date: 2011-04-20
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that the solidification rate cannot be controlled, and the obtained tissue morphology is difficult to match with the solidification parameters, which brings difficulties to experimental analysis and cannot preserve the solid-liquid interface morphology.

Method used

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  • Method for obtaining texture topography of alumina-based binary eutectic melt growth ceramic
  • Method for obtaining texture topography of alumina-based binary eutectic melt growth ceramic
  • Method for obtaining texture topography of alumina-based binary eutectic melt growth ceramic

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Embodiment 1

[0032] This embodiment is a method of obtaining Al through melting and directional solidification in the laser levitation zone. 2 o 3 / YAG binary eutectic melt growth method for the microstructure and interface morphology of ceramics, the number of directional solidified preforms is 13, and the specific process includes the following steps:

[0033] The first step is to make the prefabricated body; Al 2 o 3 and Y 2 o 3 Two powders with a purity of 4N according to Al2 o 3 / YAG eutectic components are mixed and put into a mortar, 10% PVA binder is added, the powder is mixed and ground by conventional methods until there is no agglomerated lump; 10 grams of the mixed powder is put into the cavity with a size of In a 68×10mm mold, the mold is clamped and pressurized at 25MPa, and the pressure is kept for 5 minutes, and the powder is pressed into a plate of about 68×10×5mm to form a blank of the preform; the blank of the pressed preform is processed under the atmosphere Sinte...

Embodiment 2

[0037] This embodiment is a method of obtaining Al through melting and directional solidification in the laser levitation zone. 2 o 3 The microstructure and interface morphology of EAG binary eutectic melt growth ceramics, the number of directional solidified preforms is 14, and the specific process includes the following steps:

[0038] The first step is to make the prefabricated body; Al 2 o 3 、Er 2 o 3 Two kinds of powder Al with a purity of 4N 2 o 3 / EAG eutectic components are mixed and placed in a mortar, 10% PVA binder is added, the powder is mixed and ground by conventional methods until there is no agglomerated lump; 10 grams of the mixed powder is put into the cavity with a size of In a 68×10mm mold, the mold is clamped and pressurized at 25MPa, and the pressure is kept for 5 minutes, and the powder is pressed into a plate of about 68×10×5mm to form a blank of the preform; the blank of the pressed preform is processed under the atmosphere Sintering, in order t...

Embodiment 3

[0042] This embodiment is a method of obtaining Al through melting and directional solidification in the laser levitation zone. 2 o 3 / GAP method for the microstructure and interface morphology of binary eutectic melt growth ceramics, the number of directional solidified preforms is 15, and the specific process includes the following steps:

[0043] The first step is to make the prefabricated body; Al 2 o 3 、Gd 2 o 3 Two powders with a purity of 4N according to Al 2 o 3 / GAP eutectic components are mixed and placed in a mortar, 10% PVA binder is added, the powder is mixed and ground by conventional methods until there is no agglomerated lump; 10 grams of the mixed powder is put into the cavity with a size of In a 68×10mm mold, the mold is clamped and pressurized at 25MPa, and the pressure is kept for 5 minutes, and the powder is pressed into a plate of about 68×10×5mm to form a blank of the preform; the blank of the pressed preform is processed under the atmosphere Sint...

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Abstract

The invention provides a method for obtaining the texture topography of alumina-based binary eutectic melt growth ceramic. The method comprises the following steps of: with a laser beam as a heating source and liquid gallium-indium-tin alloy as a cooling medium, respectively carrying out directional solidification on prefabticated members consisting of alumina and rare earth oxide; taking the vertical section and the cross section of each prefabticated member and performing conventional metallographical treatment; and carrying out surface metal spraying to finally obtain the texture topographies and the interface topographies of the alumina-based binary eutectic melt growth ceramic at different growth rates. In directional solidification, draw rate is 1mu m / s-10000 um m / s, and laser poweris 200W-1500W. By using the method, the obtained directional texture is quite different from a texture in a melting area and has no obvious texture transition area, and interface topography is preserved very well.

Description

technical field [0001] The invention relates to the field of material processing engineering, in particular to a method and a device for obtaining a ceramic structure grown from an alumina-based binary eutectic melt and a solid-liquid interface morphology. Background technique [0002] In recent years, oxide melt-grown ceramics obtained by directional solidification have attracted extensive attention from scholars and engineers at home and abroad. Due to their intrinsic chemical stability, oxides first overcome the insufficient oxidation resistance exhibited by many metals at high temperatures. Secondly, creep resistance, one of the bottlenecks of oxides used in high-temperature structural materials, has also been solved to a large extent in research and production. Its fracture toughness is also gradually improved. As ion conductors, proton conductors and selective high-temperature emission materials, oxides have shown great potential. However, ceramics grown from oxide ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622
Inventor 张军刘林宋衎苏海军傅恒志
Owner NORTHWESTERN POLYTECHNICAL UNIV
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