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Method for improving high temperature mechanical properties of hollow turbine blade ceramic mold

A technology for turbine blades and ceramic molds, which is applied in the field of improving the high-temperature mechanical properties of ceramic molds for hollow turbine blades. It can solve the problems of large porosity of ceramic molds and high-temperature mechanical properties of ceramic molds that are difficult to meet directional solidification. The effect of high temperature mechanical properties

Active Publication Date: 2013-07-10
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the use of the same ceramic material in the integrated manufacturing process of the ceramic core and shell, and the large porosity of the ceramic mold, it is difficult for the high-temperature mechanical properties of the ceramic mold to meet the technical requirements of directional solidification.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040]A method for improving the high-temperature mechanical properties of hollow turbine blade ceramic molds, comprising the following steps:

[0041] (1) Preparation of alumina-based ceramic body by gel injection molding process

[0042] 1) Weigh acrylamide (AM, monomer) and N,N-methylene bisacrylamide (MBAM, crosslinking agent) according to the mass ratio of 20-25:1, specifically 24:1 And organic matter such as sodium polyacrylate (dispersant) (solid phase powder 2wt%), mixed into deionized water, stirred and dissolved, and prepared into a premixed solution with an organic matter concentration of 15%.

[0043] 2 Weigh the solid powder according to the mass ratio (30~40μm alumina: 2~5μm alumina: 30~40μm magnesium oxide: 20~50nm yttrium oxide: 30~40μm titanium oxide=55~60:26~31:2~ 3:6~8:0.5~1), and stir the solid powder in the container to mix evenly.

[0044] 3) Slowly add the uniformly mixed solid powder into the premixed liquid, and keep stirring, add an appropriate amou...

Embodiment 2

[0056] A method for improving the high-temperature mechanical properties of hollow turbine blade ceramic molds, comprising the following steps:

[0057] (1) Preparation of alumina-based ceramic body by gel injection molding process

[0058] 1) Weigh acrylamide (AM, monomer) and N,N-methylenebisacrylamide (MBAM, crosslinking agent) and sodium polyacrylate (dispersant) (solid phase powder) according to the mass ratio of 25:1 2wt%) and other organic matter, mixed into deionized water, stirred and dissolved, and prepared into a premix solution with an organic matter concentration of 10%.

[0059] 2 Weigh the solid powder according to the mass ratio (30~40μm alumina: 2~5μm alumina: 30~40μm magnesium oxide: 20~50nm yttrium oxide: 30~40μm titanium oxide=40~65:25~38:4~ 5:5~10:0.2~0.5), and stir the solid powder in the container to mix evenly.

[0060] 3) Slowly add the uniformly mixed solid powder into the premixed liquid, and keep stirring, add an appropriate amount of ammonia wate...

Embodiment 3

[0071] A method for improving the high-temperature mechanical properties of hollow turbine blade ceramic molds, comprising the following steps:

[0072] (1) Preparation of alumina-based ceramic body by gel injection molding process

[0073] 1) Weigh acrylamide (AM, monomer) and N,N-methylenebisacrylamide (MBAM, cross-linking agent) and sodium polyacrylate (dispersant) (solid Phase powder 2wt%) and other organic matter, mixed into deionized water, stirred and dissolved, and prepared into a premixed solution with an organic matter concentration of 20%.

[0074] 2 Weigh the solid powder according to the mass ratio (30~40μm alumina: 2~5μm alumina: 30~40μm magnesium oxide: 20~50nm yttrium oxide: 30~40μm titanium oxide=60~65:20~35:1~ 4:7~10:0.5~0.8), and stir the solid powder in the container to mix evenly.

[0075] 3) Slowly add the uniformly mixed solid powder into the premixed solution, and keep stirring, add an appropriate amount of ammonia water to adjust the pH to 9~10, and ...

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PUM

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Abstract

The invention discloses a method for improving high temperature mechanical properties of a hollow turbine blade ceramic mold. According to the invention, a yttrium-aluminum garnet high temperature strengthening phase is synthesized from yttrium oxide and alumina through high temperature sintering, magnesium oxide is utilized at the same time for inhibiting growth of an alumina crystal grain under the condition of high temperature sintering, and titanium oxide is used for solution strengthening of alumina so as to improve high temperature strength of an alumina-based ceramic mold; finally, an yttrium chloride ion solution is used for dipping of the alumina-based ceramic mold to allow yttrium ions to be uniformly distributed in the alumina-based ceramic mold with a complex structure, so on the one hand, chloride ions are enabled to react with impurity Na and K ions in an alumina ceramic material to form sodium chloride and potassium chloride under high temperature sintering, thereby removing the Na element and the K element, and on the other hand, the yttrium ions are enabled to react with alumina under high temperature sintering for secondary formation of the yttrium-aluminum garnet high temperature strengthening phase. The method provided by the invention can be used for improving high temperature mechanical properties of a core-shell integrated alumina-based ceramic mold for a hollow turbine blade and improves a qualified rate of a directionally solidified high temperature alloy blade.

Description

technical field [0001] The invention belongs to the technical field of rapid casting, and relates to a method for improving the high-temperature mechanical properties of hollow turbine blade ceramic molds. Background technique [0002] Turbine blades are the first key components of aero-engines and gas turbines, and are known as the "jewel in the crown" because of their highest operating temperature, most complex stress, and harshest environment. Turbine blades work at higher temperatures to obtain higher power. Studies have shown that when the gas inlet temperature increases by 100°C within the range of 1073K~1273K, the output power of the gas turbine will increase by 20%~25%, saving fuel by 6%. ~7%. However, limited by the melting point of metals, the temperature that existing heat-resistant alloys used to make turbine blades can withstand has reached its limit. In order to solve this problem, a common practice is to cool the turbine blades working in a high-temperature ...

Claims

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Application Information

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IPC IPC(8): C04B41/85C04B35/78C04B35/10C04B35/622
Inventor 李涤尘鲁中良韩香广李奕宁刘涛姜博
Owner XI AN JIAOTONG UNIV
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