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Method for preparing alumina-base eutectic ceramics in laser surface atmosphere heating furnace

A eutectic ceramic and heating furnace technology, applied in the field of laser rapid prototyping of high-performance materials, can solve the problems of material cracking, materials prone to cracks and pores, etc., and achieve the effects of improving compactness, reducing thermal stress, and reducing crack disappearance.

Active Publication Date: 2013-10-16
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims at the disadvantages that cracks and pores are easily generated inside the material or cracks in the material during the process of laser rapid forming of high-performance oxide eutectic ceramic materials, reduces the internal thermal stress and defects of the material, and improves the quality and performance of the formed sample. A method for preparing dense oxide eutectic ceramics using a laser rapid prototyping surface atmosphere heating furnace, especially for the preparation of Al by assisted laser horizontal zone melting 2 o 3 method based on eutectic ceramics

Method used

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  • Method for preparing alumina-base eutectic ceramics in laser surface atmosphere heating furnace
  • Method for preparing alumina-base eutectic ceramics in laser surface atmosphere heating furnace
  • Method for preparing alumina-base eutectic ceramics in laser surface atmosphere heating furnace

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Embodiment 1

[0022] This embodiment is a method for preparing eutectic ceramics in a laser surface atmosphere heating furnace. In this example, a laser surface atmosphere heating furnace is used to prepare Al 2 o 3 / YAG eutectic ceramics, the specific process includes the following steps:

[0023] Step 1, preparation of sintered preform. with high purity Al 2 o 3 , Y 2 o 3 Powder as raw material, according to eutectic mole percentage Al 2 o 3 : Y 2 o 3 =81:19 for preparation, adding 10% PVA binder of the total amount of raw materials. Put the configured powder in PMQW type omnidirectional planetary ball mill and mix for 4h. The speed of the ball mill is 100r / min. The mixed powder is placed in a mold, and pressed into a plate-shaped sample of 70 mm × 9 mm × 6 mm by a press. The pressing pressure is 25 MPa. The obtained sample was placed in a sintering furnace and sintered for 4 hours at a temperature of 1500° C. to increase the strength of the sample so as to obtain a denser s...

Embodiment 2

[0029] This embodiment is a method for preparing eutectic ceramics in a laser surface atmosphere heating furnace. This example uses a surface atmosphere heating furnace to prepare Al 2 o 3 / YAG / YSZ ternary eutectic ceramics, the specific process includes the following steps:

[0030] Step 1, preparation of sintered preform. with high purity Al 2 o 3 , Y 2 o 3 with ZrO 2 Powder as raw material, according to eutectic mole percentage Al 2 o 3 : Y 2 o 3 : ZrO 2 =65.8: 15.6: 18.6 is prepared, and the PVA binding agent that adds raw material total amount 8%. Put the configured powder in PMQW type omnidirectional planetary ball mill and mix for 4 hours. The speed of the ball mill is 100r / min. The mixed powder is placed in a mold, and pressed into a plate-shaped sample of 70 mm × 9 mm × 3 mm by a press. The pressing pressure is 20 MPa. The obtained sample was placed in a sintering furnace and sintered for 3 hours at a sintering temperature of 1400° C. to increase the s...

Embodiment 3

[0036] This embodiment is a method for preparing eutectic ceramics in a laser surface atmosphere heating furnace. This example uses a surface atmosphere heating furnace to prepare Al 2 o 3 / EAG eutectic ceramics, the specific process includes the following steps:

[0037] Step 1, preparation of sintered preform. with high purity Al 2 o 3 、Er 2 o 3 Powder as raw material, according to eutectic mole percentage Al 2 o 3 :Er 2 o 3 =81:19 for preparation, adding 6% PVA binder of the total amount of raw materials. Put the configured powder in PMQW type omnidirectional planetary ball mill and mix for 4h. The speed of the ball mill is 100r / min. The mixed powder is placed in a mold and pressed into a Φ6mm×70mm rod-shaped sample by a press. The pressing pressure is 30MPa. The obtained sample was placed in a sintering furnace and sintered for 2 hours at a sintering temperature of 1200° C. to increase the strength of the sample, thereby obtaining a denser sintered preform. ...

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Abstract

The invention relates to a method for preparing alumina-base eutectic ceramics in a laser surface atmosphere heating furnace, which comprises the following steps: preparing two or more high-purity powder oxide rare-earths as raw materials according to eutectic mol percentage, and sintering at high temperature to obtain a compact prefabricated body; heating the prefabricated body in a surface atmosphere heating furnace to 800-1300 DEG C, introducing argon or nitrogen into the furnace as a protective gas while keeping the temperature, and quickly melting and solidifying the prefabricated body by using a laser device; after the sample is solidified, continuing keeping the temperature in the heating furnace to obtain the eutectic ceramics. By combining the surface atmosphere heating furnace with the laser quick forming technique, the invention can quickly melt the high melting point material, implement high temperature gradient (>3000K / cm), greatly lower the thermal stress of the material generated in the laser forming process, and eliminate bubbles, thereby obtaining the high-compactness crack-free alumina-base eutectic ceramics.

Description

technical field [0001] The invention relates to the field of laser rapid forming preparation of high-performance materials, in particular to a preparation technology for realizing high melting point, high density and low thermal stress eutectic ceramic material by using a laser rapid forming surface atmosphere heating furnace device. Background technique [0002] Oxide eutectic autogenous ceramics have excellent high-temperature strength, thermal stability, creep resistance and high-temperature oxidation resistance. They are ultra-high-temperature structural materials that have been developed in recent years and are expected to be used in harsh environments above 1650 °C for a long time. However, the main preparation technology of oxide ceramic materials is still the powder sintering method so far. Since the powder sintered ceramic materials are all polycrystalline structures, it is usually impossible to obtain single crystal constituent phases, and there are a large number ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/10C04B35/622
Inventor 苏海军张军于建政刘林傅恒志
Owner NORTHWESTERN POLYTECHNICAL UNIV
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