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Preparation and application methods of calcium zirconate ceramic core

A technology of ceramic core and calcium zirconate, which is applied in the field of ceramic core to achieve the effects of good high-temperature dimensional stability, high-temperature deflection, and high-temperature chemical stability

Inactive Publication Date: 2019-04-05
沃尔曼科技张家港有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the Nb-Si-based alloy is limited by the melting point of the alloy itself, and it is necessary to improve the air-cooling structure of the turbine blade to increase the temperature bearing capacity of the blade and the cooling efficiency during use.

Method used

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preparation example Construction

[0022] The invention provides a preparation method of calcium zirconate ceramic core, comprising the following steps:

[0023] Mix acrylamide, cross-linking agent and absolute ethanol to obtain a premix;

[0024] Mixing the premix, dispersant, calcium zirconate and mineralizer to obtain calcium zirconate core slurry;

[0025] mixing the calcium zirconate core slurry, an initiator and a catalyst, and casting to obtain a calcium zirconate ceramic core blank;

[0026] The calcium zirconate ceramic core blank is powder buried and sintered to obtain the calcium zirconate ceramic core.

[0027] In the present invention, unless otherwise specified, the raw material components are commercially available products well known to those skilled in the art.

[0028] The present invention mixes acrylamide, cross-linking agent and absolute ethanol to obtain a premixed liquid. In the present invention, the cross-linking agent is preferably one or more of the cross-linking agent MBAM, the cr...

Embodiment 1

[0053] Mix 20g of acrylamide, 1g of crosslinking agent MBAM and 200g of absolute ethanol to obtain a premix;

[0054] 633g of calcium zirconate with a particle size of 325 mesh and 26g of alumina with a particle size of 500 mesh were vacuum-dried at 120°C for 24 hours, respectively, and set aside;

[0055] Under the condition of stirring, 0.13gTMAH was added to 221g of the premixed solution, and after mixing evenly, a mixture of 633g of calcium zirconate with a particle size of 325 mesh and 26g of alumina with a particle size of 500 mesh was added to it, and ball milled for 12h to obtain Calcium zirconate core slurry with a solid phase volume fraction of 40%;

[0056] Add 0.71 g of ammonium persulfate and 0.71 g of tetramethylethylenediamine to the 659 g of calcium zirconate core slurry, stir evenly, cast into a 3D printed plastic mold, polymerize and solidify for 30 minutes, and After drying for 24 hours, drying at a temperature of 90°C and a humidity of 70% for 26 hours to ...

Embodiment 2

[0060] Mix 20g of acrylamide, 1g of crosslinking agent MBAM and 200g of absolute ethanol to obtain a premix;

[0061] 653g of calcium zirconate with a particle size of 325 mesh and 26g of yttrium oxide with a particle size of 500 mesh were vacuum-dried at 120°C for 24 hours, respectively, and set aside;

[0062] Under the condition of stirring, 0.13g of polyethylene glycol was added in 221g of the premixed liquid, after mixing evenly, the mixture of 325 mesh calcium zirconate and 26g of 500 mesh yttrium oxide with a particle diameter of 653g after drying was added therein, Ball milling for 12 hours to obtain a calcium zirconate core slurry with a solid phase volume fraction of 40%;

[0063] Add 0.71g of ammonium persulfate and 0.71g of tetramethylethylenediamine to the 679g of calcium zirconate core slurry, stir evenly, cast into a 3D printed plastic mold, polymerize and solidify for 30min, and After drying for 24 hours, drying at a temperature of 90°C and a humidity of 70% f...

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Abstract

The invention relates to the technical field of ceramic cores, particularly to preparation and application methods of a calcium zirconate ceramic core. The preparation method of the calcium zirconateceramic core comprises the following steps of mixing acrylamide, crosslinking agent and absolute ethyl alcohol to obtain a premixed solution; mixing the premixed solution, dispersion, calcium zirconate and mineralizer to obtain a calcium zirconate pulp; mixing the calcium zirconate pulp, initiator and catalysts for mold casting to obtain a calcium zirconate ceramic core blank; powder-sintering thecalcium zirconate ceramic core blank to obtain the calcium zirconate ceramic core. The calcium zirconate ceramic core prepared through the method is high in strength and more applicable to at high temperature casting Nb-Si-based alloy turbine blades, and meanwhile, achieves high-temperature chemical stability, avoids sharp reaction with chemical elements of Nb-Si-based alloy and effectively ensures the quality of the inner cavity of Nb-Si alloy hollow blades.

Description

technical field [0001] The invention relates to the technical field of ceramic cores, in particular to a preparation method and application of a calcium zirconate ceramic core. Background technique [0002] In recent years, Nb-Si-based alloys are expected to be used as one of the important materials for the development of high thrust-to-weight ratio aeroengine blade materials due to their high room temperature strength, certain toughness at room temperature, high melting point and low density. However, the Nb-Si-based alloy is limited by the melting point of the alloy itself, and it is necessary to improve the air-cooling structure of the turbine blade to increase the temperature bearing capacity of the blade and the cooling efficiency during use. [0003] One of the key technologies of hollow turbine blades is to prepare high-performance ceramic core components. The ceramic core is mainly used to form the inner cavity of the hollow blade, and its performance will affect th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/488C04B35/622C04B38/00B22C9/10B22C1/00B22C9/24
CPCB22C1/00B22C9/10B22C9/24C04B35/488C04B35/4885C04B35/622C04B38/00C04B2235/3225C04B2235/5436C04B2235/6562C04B2235/6567C04B2235/96C04B38/0074
Inventor 余建波任忠鸣
Owner 沃尔曼科技张家港有限公司
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