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Preparation and application methods of barium zirconate ceramic core

A technology of ceramic core and barium zirconate, which is applied in the field of ceramic core to achieve high room temperature strength, high dimensional stability, and good chemical stability at high temperature

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, Nb-Si-based alloys are 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 its temperature bearing capacity and cooling efficiency during use.

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0021] The invention provides a kind of preparation method of barium zirconate ceramic core, comprises the following steps:

[0022] mixing barium zirconate, beeswax and paraffin wax to obtain barium zirconate ceramic paraffin wax slurry;

[0023] Die-casting the barium zirconate ceramic paraffin wax slurry to obtain a barium zirconate ceramic core blank;

[0024] The barium zirconate ceramic core blank is powder-buried and sintered to obtain the barium zirconate ceramic core.

[0025] In the present invention, unless otherwise specified, the raw material components are commercially available products well known to those skilled in the art.

[0026] The invention mixes barium zirconate, beeswax and paraffin wax to obtain barium zirconate ceramic paraffin wax slurry. In the present invention, the barium zirconate is preferably obtained by mixed ball milling of coarse barium zirconate grains and fine barium zirconate grains; in the present invention, the particle size of the c...

Embodiment 1

[0047] 200g of coarse grains with a particle diameter of 325 mesh and 400g of fine grains with a particle diameter of 1000 mesh were mixed and ball-milled, and vacuum-dried at 120°C for 24 hours to obtain barium zirconate;

[0048] Mix 7g of beeswax and 60g of paraffin, heat up to 90°C and melt to obtain a molten mixture of beeswax and paraffin;

[0049] Under the stirring condition that the rotating speed is 50rpm, slowly add 600g of barium zirconate into the molten mixture of beeswax and paraffin, and continue to stir for 10h after adding, to obtain barium zirconate ceramic paraffin wax slurry;

[0050] Continue to keep the barium zirconate ceramic paraffin wax slurry at 90°C and stir at a rate of 10rpm to keep the slurry uniformly dispersed for die-casting. The pressure of die-casting is 20MPa, and the holding time is 50s. Cooling and demoulding to obtain the barium zirconate ceramic core blank;

[0051] Using industrially calcined barium zirconate powder as the embedded p...

Embodiment 2

[0054] 200g of coarse grains with a particle size of 500 mesh and 400g of fine grains with a particle size of 2000 mesh were mixed and ball-milled, and vacuum-dried at 120°C for 24 hours to obtain barium zirconate;

[0055] Mix 7g of beeswax and 60g of paraffin, heat up to 90°C and melt to obtain a molten mixture of beeswax and paraffin;

[0056] Under the stirring condition that the rotating speed is 50rpm, slowly add 600g of barium zirconate powder into the molten mixture of beeswax and paraffin, and continue stirring for 10h after adding, to obtain barium zirconate ceramic paraffin wax slurry;

[0057] Continue to keep the barium zirconate ceramic paraffin wax slurry at 90°C and continue to stir at a rate of 10rpm to keep the slurry uniformly dispersed for die-casting. The pressure of die-casting is 20MPa, and the holding time is 50s , cooling, and demoulding to obtain a barium zirconate ceramic core blank;

[0058] Using industrially calcined barium zirconate powder as th...

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Abstract

The invention relates to the technical field of ceramic cores, particularly to preparation and application methods of a barium zirconate ceramic core. The preparation method of the barium zirconate ceramic core comprises the following steps of mixing barium zirconate, beewax and paraffin to obtain a barium zirconate ceramic paraffin pulp; die-casting the barium zirconate ceramic paraffin pulp to obtain a barium zirconate ceramic core blank; sintering the barium zirconate ceramic core blank to obtain the barium zirconate ceramic core. The barium zirconate ceramic core prepared through the method is high in room temperature strength and high-temperature stability, maintains high size stability before and after being sintered, is applicable to at high temperature casting Nb-Si-based alloy turbine blades, avoids sharp reaction with chemical elements of Nb-Si-based alloy and 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 barium 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 turbine 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 its temperature bearing capacity and cooling efficiency during use. [0003] One of the key technologies of turbine blades is to prepare high-performance ceramic core components. The ceramic core is mainly used to form the inner cavity of the turbine blade, and its performance will affect the quality of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/486C04B35/622B22C9/10B22C1/00B22C9/24
CPCB22C1/00B22C9/10B22C9/24C04B35/486C04B35/622C04B38/00C04B2235/5436C04B2235/6562C04B2235/6567C04B2235/96C04B38/0074
Inventor 余建波任忠鸣
Owner 沃尔曼科技张家港有限公司
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