Method for preparing aluminum oxide-based eutectic ceramic through laser powder feeding method

A technology of eutectic ceramics and alumina, which is applied in the field of laser rapid prototyping preparation of high-performance materials, can solve the problems of rare preparation technology and limited laser processing and forming technology, so as to facilitate the study of solidification theory, improve quality and performance, The effect of eliminating pores

Active Publication Date: 2012-07-11
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the high brittleness of ceramics, the application of laser processing and forming t...

Method used

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  • Method for preparing aluminum oxide-based eutectic ceramic through laser powder feeding method
  • Method for preparing aluminum oxide-based eutectic ceramic through laser powder feeding method
  • Method for preparing aluminum oxide-based eutectic ceramic through laser powder feeding method

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Embodiment 1

[0026] This embodiment is a method for preparing alumina-based eutectic ceramics by powder feeding method. This embodiment adopts this method to prepare Al 2 o 3 / YAG eutectic ceramics, the specific process includes the following steps:

[0027] Step 1, prepare Al 2 o 3 / YAG eutectic ceramic powder. 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 Ratio weighing raw materials, adding PVA binder in the weighed raw materials; the added PVA binder is 10% of the total amount of raw materials. The above-mentioned configured raw materials were placed in a PMQW type omnidirectional planetary ball mill and mixed for 4 hours. The speed of the ball mill is 100r / min. Mix the powder evenly to get the prepared Al 2 o 3 / YAG eutectic ceramic powder.

[0028] Step 2, heating in a surface atmosphere heating furnace. Spread the obtained part of the powder evenly on the metal substrate to form Al 2 o ...

Embodiment 2

[0032] This embodiment is a method for preparing alumina-based eutectic ceramics by powder feeding method. This embodiment adopts this method to prepare ternary eutectic ceramics, and its specific process includes the following steps:

[0033] Step 1, prepare Al 2 o 3 / YAG / YSZ eutectic ceramic powder. with high purity Al 2 o 3 , Y 2 o 3 , 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 Ratio Weigh raw materials, add PVA binding agent in the weighed raw materials; The added PVA binding agent is 10% of raw material total amount. The above-mentioned configured raw materials were placed in a PMQW type omnidirectional planetary ball mill and mixed for 4 hours. The speed of the ball mill is 100r / min. Mix the powder evenly to get the prepared Al 2 o 3 / YAG / YSZ eutectic ceramic powder.

[0034] Step 2, heating in a surface atmosphere heating furnace. Spread the obtained part of the powder evenly on the ...

Embodiment 3

[0038] This embodiment is a method for preparing alumina-based eutectic ceramics by powder feeding method. This embodiment adopts this method to prepare Al 2 o 3 / GdAlO 3 (GAP) eutectic ceramics, the specific process includes the following steps:

[0039] Step 1, prepare Al 2 o 3 / GAP eutectic ceramic powder. with high purity Al 2 o 3 、Gd 2 o 3 Powder as raw material, according to eutectic mole percentage Al 2 o 3 :Gd 2 o 3 The ratio of =77:23 weighs the raw materials, and adds PVA binder in the weighed raw materials; the added PVA binder is 10% of the total amount of raw materials. The above-mentioned configured raw materials were placed in a PMQW type omnidirectional planetary ball mill and mixed for 4 hours. The speed of the ball mill is 100r / min. Mix the powder evenly to get the prepared Al 2 o 3 / GAP eutectic ceramic powder.

[0040] Step 2, heating in a surface atmosphere heating furnace. Spread the obtained part of the powder evenly on the metal subst...

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Abstract

The invention relates to a method for preparing aluminum oxide-based eutectic ceramic through a laser powder feeding method. By the method, the thermal stress in the zone-melting process is reduced by heating the eutectic ceramic, so that crack generated in the powder melting process is reduced. The powder is conveyed to be in front of a layer molten pool, laser zone-melting orienting solidification is finished when the powder falls off a substrate, power is conveyed continuously by using a powder feeding device on the eutectic ceramic surface, the powder on a second layer is molten through laser zone-melting, and the power and the laser zone-melting eutectic ceramic are molten and combined into a whole. Repeatedly, the large-volume eutectic ceramic material is prepared by a laser quick forming method. In the heating and forming process, the powder feeding quantity laser power, the scanning speed and the facula are controlled and high-purity inert gas is introduced, so that air in thefurnace body can be escaped completely, air holes in the forming material are eliminated and stable growth of the crystal is realized. Powder is repeatedly molten into a matrix the method of repeatedaccumulation and multi-time cladding, so that the large-volume eutectic ceramic can be prepared.

Description

technical field [0001] The invention relates to the field of laser rapid forming preparation of high-performance materials, specifically a three-dimensional forming using a surface atmosphere heating furnace to assist laser powder feeding to achieve high melting point, high density and low thermal stress, especially alumina-based eutectic ceramics with a large volume Material preparation techniques. 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 obt...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/622
Inventor 苏海军于建政张军刘林傅恒志
Owner NORTHWESTERN POLYTECHNICAL UNIV
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