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Method for getting structure appearance of aluminum oxide-based ternary melt growth ceramic

A technology of tissue morphology and melt growth, applied in the field of material processing engineering, can solve problems such as low temperature gradient, high cost, complex structure, etc., achieve good orientation, uniform and small and dense structure, and overcome high cost

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

[0010] In order to overcome the deficiencies in the prior art, such as complex structure, high cost, uneven isothermal surface, or low temperature gradient, the present invention proposes a method for obtaining the morphology of oxide melt grown ceramics

Method used

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  • Method for getting structure appearance of aluminum oxide-based ternary melt growth ceramic
  • Method for getting structure appearance of aluminum oxide-based ternary melt growth ceramic
  • Method for getting structure appearance of aluminum oxide-based ternary melt growth ceramic

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Embodiment 1

[0027] This embodiment is a way to obtain Al 2 o 3 / YAG / ZrO 2 The method for directional solidification structure morphology of ternary eutectic melt grown ceramics under different growth rates, the number of directional solidified preforms is 5, and the specific process includes the following steps:

[0028] The first step is to make 5 prefabricated bodies; the production process of each prefabricated body is to make Al 2 o 3 , Y 2 o 3 and ZrO 2 Three kinds of high-purity (4N) powders are mixed according to mole percentage 65.8 / 15.6 / 18.6 and put into the mortar, add 10% PVA binder, the powders are mixed and ground to no agglomerated lumps by conventional methods; take 10 Put the mixed powder into a mold with an inner cavity size of 68×10mm, close the mold and pressurize at 25MPa, hold the pressure for 5 minutes, and press the powder into a plate of about 68×10×5mm to form a blank of the prefabricated body; The blank of the pressed preform is sintered in the atmosphere ...

Embodiment 2

[0032] This embodiment is a way to obtain Al 2 o 3 / YAG / ZrO 2 The method for the directional solidification structure morphology of ternary hypoeutectic melt grown ceramics under different growth rates, the number of directional solidified preforms is 6, and the specific process includes the following steps:

[0033] The first step is to make the prefabricated body; 2 o 3 , Y 2 o 3 and ZrO 2 Three kinds of high-purity (4N) powders are mixed according to the mole percentage 65.8 / 15.6 / 12 and put into the mortar, add 10% PVA binder, the powders are mixed and ground to no agglomerated lumps by conventional methods; 10 Put the mixed powder into a mold with an inner cavity size of 68×10mm, close the mold and pressurize at 20MPa, hold the pressure for 7 minutes, and press the powder into a plate of about 68×10×5mm to form a blank of the prefabricated body; Sinter the pressed preform in the atmosphere to increase the strength of the preform. The sintering temperature is 1600°C,...

Embodiment 3

[0037] This embodiment is a way to obtain Al 2 o 3 / YAG / ZrO 2 The method for directional solidification structure morphology of ternary hypereutectic melt grown ceramics under different growth rates, the number of directional solidified preforms is 7, and the specific process includes the following steps:

[0038] The first step is to make the prefabricated body; Al 2 o 3 , Y 2 o 3 and ZrO 2 Three kinds of high-purity (4N) powders are mixed according to molar percentage 65.8 / 15.6 / 31.7 and put into the mortar, add 10% PVA binder, the powders are mixed and ground to non-agglomerated lumps by conventional methods; 10 Put the mixed powder into a mold with an inner cavity size of 68×10mm, close the mold and pressurize at 22MPa, hold the pressure for 6 minutes, and press the powder into a plate of about 68×10×5mm to form a blank of the prefabricated body; Sinter the pressed preform in the atmosphere to increase the strength of the preform. The sintering temperature is 1600°C,...

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Abstract

The invention relates to a method for getting the structure appearance of an aluminum oxide-based ternary melt growth ceramic, and a two-way equal-quality laser beam is adopted for zonemelting a plurality of preforms of the aluminum oxide-based ternary melt growth ceramic formed by aluminum oxide, yttrium oxide and zirconium oxide so as to realize directional solidification of the preforms. The structure appearances of the Al2O3 (aluminum oxide) / YAG (yttrium oxide) / ZrO2 (zirconium oxide) ternary oxide melt growth ceramic under different growth rates can be obtained by taking longitudinal cross sections and transverse cross sections of all the preforms after the directional solidification and spraying metal on the surface after the conventional metallurgical processing. In the directionalsolidification, the laser power is 200W, and the rotational speed of a test sample rotating system is 50Rpm; and the withdrawal rate of each preform is 1-300 mu m / s. With the adoption of the method, the purpose of enabling a temperature field on the front edge of a solid-liquid interface of each preform to be uniform and straight can be realized, the defects of high cost and complex structure in the traditional method can be overcome, and the research on structure evolution of the directional solidification can be carried out on non-conductive materials with high melting point.

Description

technical field [0001] The invention relates to the field of material processing engineering, in particular to a method for obtaining the morphology of alumina-based ternary melt-grown ceramics. Background technique [0002] A1 2 o 3 / YAG / ZrO 2 Ternary eutectic oxide melt-grown ceramics are considered to be the most likely materials to replace superalloys as the next generation of high-thrust ratio engine blades due to their excellent high-temperature mechanical properties and corrosion resistance. However, it still needs a lot of research and practice before it is applied in industry, the most important part of which is to reveal the relationship between its solidification structure and solidification conditions, so as to lay the foundation for the system design of a reliable and stable production process. [0003] At present, the morphology of oxide melt grown ceramics is generally obtained by Bridgman method and epitaxial growth method. [0004] The Bridgman method, t...

Claims

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Application Information

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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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