Method for obtaining aluminum oxide-based ternary melt grown ceramic tissue morphology

A technology of melt growth and microstructure morphology, which is applied in the field of material processing engineering, can solve the problems of difficult microstructure, failure to retain solid-liquid interface morphology, and difficult experimental analysis, so as to improve the temperature gradient of the solid phase and compensate for the thermal conductivity Insufficient, the effect of increasing the superheat of the melting zone

Active Publication Date: 2011-08-17
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 aluminum oxide-based ternary melt grown ceramic tissue morphology
  • Method for obtaining aluminum oxide-based ternary melt grown ceramic tissue morphology
  • Method for obtaining aluminum oxide-based ternary melt grown ceramic tissue morphology

Examples

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Embodiment 1

[0030] This example is a method for Al 2 o 3 / YAG / ZrO 2 The method for directional solidification of laser suspension zone melting and directional solidification of ternary eutectic melt grown ceramics, the number of directional solidified preforms is 13, and the specific process includes the following steps:

[0031] 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 the 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; 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; Sinter the blank of the pressed preform in the atmosphere to increase the strength of the preform, the sintering tem...

Embodiment 2

[0035] This embodiment is a method for A1 2 o 3 / YAG / ZrO 2 The method for directional solidification of laser suspension zone melting and directional solidification of ternary hypoeutectic melt grown ceramics, the number of directional solidified preforms is 14, and the specific process includes the following steps:

[0036] 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 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 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; Sinter the blank of the pressed preform in the atmosphere to increase the strength of the preform, the sinterin...

Embodiment 3

[0040] This example is a method for Al 2 o 3 / YAG / ZrO 2 Method of directional solidification in the laser suspension zone of ternary hypereutectic melt-grown ceramics The method of directional solidification in the laser suspension zone of melt-grown ceramics, the number of preforms to be directional solidified is 15, and the specific process includes the following step:

[0041] 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 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; Sinter the blank of the pressed preform in the atmosph...

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Abstract

The invention discloses a method for obtaining aluminum oxide-based ternary melt grown ceramic tissue morphology, which comprises the following steps of: combining zone melting and liquid metal cooling, and performing directional solidification on a plurality of precast bodies formed by using aluminum oxide, yttrium oxide and zirconium oxide respectively; and taking the longitudinal sections and the transverse sections of the directional solidified precast bodies, performing conventional metallographic treatment, and performing surface metal spraying to obtain tissue morphology and interface morphology of the aluminum oxide-based ternary eutectic oxide melt grown ceramic at different growth rates. In the directional solidification, the withdrawing rate is 1 to 10,000mum/s, and the laser power is 200 to 1,500W. The obtained directional solidification tissues are greatly different from the tissues in a melting zone and have no obvious tissue transition zone, and the interface morphologyis preserved perfectly.

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] Al 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. In addition, Al 2 o 3 / YAG / ZrO 2 Under the conditions of high temperature gradient and high solidification rate, the solidification structure of ternary eutectic ox...

Claims

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Application Information

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