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A Method for Improving Formability of Ceramic Core

A ceramic core and formability technology, which is applied in the direction of cores, mold components, casting molding equipment, etc., can solve the problems of complex structural ceramic cores such as compression deformation, improve fluidity, prevent deformation, and increase firing shrinkage Effect

Active Publication Date: 2018-07-31
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems existing in the prior art, the present invention provides a method for improving the formability of the ceramic core, the purpose of which is to improve the fluidity of the ceramic core slurry and realize the compression molding of the complex structure ceramic core when the mold temperature is normal temperature , so as to solve the problem of pressing and deformation of complex structure ceramic cores; it can also realize the compression molding of 0.3mm thick vent slot cores under low temperature conditions, and meet the needs of the development of thin-walled thick single crystal blades

Method used

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  • A Method for Improving Formability of Ceramic Core

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Effect test

Embodiment 1

[0016] The method for improving the moldability of the ceramic core of the present embodiment is carried out according to the following steps:

[0017] (1) Preparation of ceramic core slurry: according to weight percentage, put 40% of F220 quartz glass powder, 25% of F600 quartz glass powder, 30% of zircon powder and 5% of quartz glass fiber chopped strands into a ball mill jar In the process, the diameter of the chopped quartz glass fiber is 8 μm~10 μm, the length is 1mm~3mm, and the mixture is obtained by ball milling for 2 hours; the plasticizer accounting for 20% of the weight of the mixture is added to the stirrer, heated to 110 °C, Adding the mixture to the melted plasticizer and stirring for 20 hours to obtain ceramic core slurry;

[0018] (2) Press the core on the core injection machine, the ceramic core slurry injection temperature is 105°C, the mold temperature is 28°C, the injection pressure is 1Mpa, and the pressure is maintained for 50s to obtain a complex structu...

Embodiment 2

[0020] The method for improving the moldability of the ceramic core of the present embodiment is carried out according to the following steps:

[0021] (1) Preparation of ceramic core slurry: according to weight percentage, put 45% of F220 quartz glass powder, 22.5% of F600 quartz glass powder, 30% of zircon powder and 2.5% of quartz glass fiber chopped strands into a ball mill jar In the method, the diameter of the chopped quartz glass fiber is 8μm~10μm, the length is 1mm~3mm, and the mixture is obtained by ball milling for 2.5 hours; the plasticizer accounting for 22% of the weight of the mixture is added to the stirrer, heated to 120°C, Adding the mixture to the melted plasticizer and stirring for 24 hours to obtain ceramic core slurry;

[0022] (2) Press the core on the core injection machine, the ceramic core slurry injection temperature is 95°C, the mold temperature is 30°C, the injection pressure is 3Mpa, and the pressure is maintained for 50s to obtain a complex struct...

Embodiment 3

[0024] The method for improving the moldability of the ceramic core of the present embodiment is carried out according to the following steps:

[0025] (1) Preparation of ceramic core slurry: according to the weight percentage, put 49.5% of F220 quartz glass powder, 20% of F600 quartz glass powder, 30% of zircon powder and 0.5% of quartz glass fiber chopped strands into a ball mill jar Among them, quartz glass fiber chopped strands have a diameter of 8 μm to 10 μm and a length of 1 mm to 3 mm. They are ball milled and mixed for 2.5 hours to obtain a mixture; add a plasticizer accounting for 17% of the weight of the mixture into the stirrer and heat to 115 ° C. Adding the mixture to the melted plasticizer and stirring for 25 hours to obtain ceramic core slurry;

[0026] (2) Press the core on the core injection machine, the ceramic core slurry injection temperature is 100°C, the mold temperature is 25°C, the injection pressure is 2Mpa, and the pressure is maintained for 50s to o...

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Abstract

The invention belongs to the field of precision casting of single crystal blades, and in particular relates to a method for improving the formability of a ceramic core. In the present invention, quartz glass powder, zircon powder and 0.5%~5% of quartz glass fiber chopped strands are ball milled to obtain a mixture, and the mixture is added to the melted plasticizer and stirred for at least 20 hours to obtain a ceramic core slurry Material, press the core on the core injection machine, the mold temperature is 25 ℃ ~ 30 ℃ to get a complex structure ceramic core, or preheat the mold to 38 ℃ ~ 42 ℃, injection pressure 1 ~ 3Mpa, hold pressure 50s, A ceramic core with a thickness of 0.3mm is obtained. The invention improves the fluidity of the ceramic core slurry, realizes the compression molding of the ceramic core with a complex structure under normal temperature mold temperature, makes the core completely cool in the mold, and prevents the core from being deformed when it is ejected and placed. Deformation, can realize the compression molding of the 0.3mm thick vent slot core at the mold temperature of 35 ℃ ~ 42 ℃.

Description

technical field [0001] The invention belongs to the field of precision casting of single crystal blades, and in particular relates to a method for improving the formability of a ceramic core. Background technique [0002] At present, the conventional pressing process of the complex structure ceramic core is heating the mold to 40 ℃ ~ 45 ℃ → pressing the core → orthopedic tire correction. However, due to the poor fluidity of the ceramic core slurry, in order to press the complex structure of the ceramic core, the mold is usually heated to 40 ° C ~ 45 ° C, resulting in the ceramic core slurry cannot be completely cooled in the mold, and the The stress generated at the time causes the plastic deformation of the ceramic core. Although the orthopedic tire can achieve a certain orthopedic effect, it is often not ideal, and it is difficult to form a ceramic core with a thickness of only 0.3mm for the exhaust seam. [0003] The traditional method to improve the fluidity of the cer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/10
Inventor 张世东郭伟杰张松胜张明俊
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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