Solidification preparation method for aluminum oxide-based ternary nanometer eutectic/amorphous ceramic

An alumina-based and ternary technology, which is applied in the field of rapid solidification preparation, can solve the problems of difficulty in studying the effect of cooling rate and failure to obtain it, and achieve the effects of wide solidification rate range, high solidification rate and rich solidification structure.

Active Publication Date: 2018-02-06
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since it fails to obtain the eutectic phase size distribution and eutectic-amorphous structure evolution law at different rates, it is difficult to study the effect of cooling rate on the solidification structure of different materials

Method used

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  • Solidification preparation method for aluminum oxide-based ternary nanometer eutectic/amorphous ceramic
  • Solidification preparation method for aluminum oxide-based ternary nanometer eutectic/amorphous ceramic
  • Solidification preparation method for aluminum oxide-based ternary nanometer eutectic/amorphous ceramic

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Experimental program
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Effect test

Embodiment 1

[0032] This embodiment is a method of melting samples in a laser levitation directional solidification zone and performing liquid metal quenching on falling melt droplets by surface tension effect to prepare alumina-based nano-eutectic / amorphous ceramic materials. This embodiment adopts this method to prepare Al 2 o 3 -Er 2 o 3 -ZrO 2 Ternary system nano-eutectic / amorphous ceramics, the specific process includes:

[0033] Step 1, Al 2 o 3 -Er 2 o 3 -ZrO 2 Preparation of ternary system eutectic component powders. Select Al with a purity of 99.99% 2 o 3 Powder, Er 2 o 3 Powder and ZrO 2 powder. According to Al 2 o 3 -Er 2 o 3 -ZrO 2 Al 2 o 3 -Er 2 o 3 -ZrO 2 Mix powder. Weigh 100g of the mixed powder obtained, and add 15ml of polyvinyl alcohol solution and 60ml of absolute ethanol to the weighed mixed powder, and use a ball mill to fully mix; the speed of the ball mill is 550r / min, and the ball milling time is 5h. Put the mixed powder into a drying ove...

Embodiment 2

[0039] This embodiment is a method of melting samples in a laser levitation directional solidification zone and performing liquid metal quenching on falling melt droplets by surface tension effect to prepare alumina-based nano-eutectic / amorphous ceramic materials. This embodiment adopts this method to prepare Al 2 o 3 -Y 2 o 3 -ZrO 2 Ternary system nano-eutectic / amorphous ceramics, the specific process includes:

[0040] Step 1, Al 2 o 3 -Y 2 o 3 -ZrO 2 Preparation of ternary system eutectic component powders. Select Al with a purity of 99.99% 2 o 3 Powder, Y 2 o 3 Powder and ZrO 2 powder. According to Al 2 o 3 -Y 2 o 3 -ZrO 2 Al 2 o 3 -Y 2 o 3 -ZrO 2 Mix powder. Weigh 100g of the mixed powder obtained, and add 10ml of polyvinyl alcohol solution and 50ml of absolute ethanol to the weighed mixed powder, and use a ball mill to fully mix; the speed of the ball mill is 500r / min, and the ball milling time is 3h. Put the mixed powder into a drying oven and...

Embodiment 3

[0046] This embodiment is a method of melting samples in a laser levitation directional solidification zone and performing liquid metal quenching on falling melt droplets by surface tension effect to prepare alumina-based nano-eutectic / amorphous ceramic materials. This embodiment adopts this method to prepare Al 2 o 3 -Gd 2 o 3 -ZrO 2 Ternary system nano-eutectic / amorphous ceramics, the specific process includes:

[0047] Step 1, Al 2 o 3 -Gd 2 o 3 -ZrO 2 Preparation of ternary system eutectic component powders. Select Al with a purity of 99.99% 2 o 3 Powder, Gd 2 o 3 Powder and ZrO 2 powder. According to Al 2 o 3 -Gd 2 o 3 -ZrO 2 Al 2 o 3 -Gd 2 o 3 -ZrO 2 Mix powder. Weigh 100g of the mixed powder obtained, and add 20ml of polyvinyl alcohol solution and 80ml of absolute ethanol to the weighed mixed powder, and use a ball mill to fully mix; the speed of the ball mill is 600r / min, and the ball milling time is 6h. Put the mixed powder into a drying ove...

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Abstract

The invention relates to a solidification preparation method for aluminum oxide-based ternary nanometer eutectic / amorphous ceramic. A laser floating zone-melting directional solidification device is adopted for preparing an oxide ceramic material, and the heating capacity, relative moving capacity and combination with liquid metallic quenching phase of the laser floating zone-melting directional solidification device are utilized to quickly cool the melt and acquire the nanometer eutectic / amorphous ceramic in a wide solidification rate range. According to a melt falling liquid metal quenchingmethod based on a laser floating zone-melting directional solidification method provided by the invention, the ultrahigh cooling speed can be achieved at the moment of leaving the laser irradiation, namely, falling into the liquid metal for quenching, the cooling rate distribution spans at least four orders of magnitudes (10-10<6> micron / s), the solidification structure is abundant and the preparation for oxide nanometer eutectic / amorphous ceramic is easily realized.

Description

technical field [0001] The invention relates to a method for preparing alumina-based ternary nano-eutectic / amorphous ceramics. Specifically, it uses laser suspension zone melting equipment to melt rare earth oxide preforms with non-conductivity, high melting point and low thermal conductivity, and uses the surface tension effect to control the size of the sample for liquid metal quenching to obtain alumina-based ternary nanoeutectics / Rapid solidification preparation technology of amorphous ceramics. Background technique [0002] Alumina-based eutectic autogenous composite ceramics have excellent high-temperature structural stability, chemical stability, high-temperature strength, creep resistance, corrosion resistance and oxidation resistance, and are expected to work in harsh environments above 1650°C for long-term ultra-high temperature Structural materials. Some of the oxide system eutectic autogenous composite ceramics not only have excellent high-temperature mechani...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/626C04B35/653
CPCC04B35/10C04B35/62645C04B35/653C04B2235/3224C04B2235/3225C04B2235/3244C04B2235/658C04B2235/665C04B2235/76C04B2235/781C04B2235/783
Inventor 苏海军任群卢泽张军刘林傅恒志
Owner NORTHWESTERN POLYTECHNICAL UNIV
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