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Preparation method for ceramic shell for nickel-based superalloy single crystal/directional solidification

A nickel-based high-temperature alloy, directional solidification technology, applied in casting molding equipment, metal processing equipment, casting molds, etc., can solve the problem of chemical reaction between the surface of the mold shell and the molten alloy, etc.

Active Publication Date: 2017-05-31
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the surface of the existing superalloy single crystal directional solidification ceramic shell is prone to chemical reactions with the molten alloy, the purpose of the present invention is to provide a nickel-based superalloy single crystal / ceramic shell for directional solidification The preparation method of the ceramic shell prepared by this method can ensure the strength of the shell and the surface quality of the casting, and improve the pollution of the impurity element silicon from the shell into the alloy liquid during the directional solidification process of the single crystal, thereby ensuring the quality of the casting alloy

Method used

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  • Preparation method for ceramic shell for nickel-based superalloy single crystal/directional solidification
  • Preparation method for ceramic shell for nickel-based superalloy single crystal/directional solidification
  • Preparation method for ceramic shell for nickel-based superalloy single crystal/directional solidification

Examples

Experimental program
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Effect test

Embodiment 1

[0028] 1. Prepare the surface coating, prepare EC95 (320 mesh) chemical composition as shown in Table 1, silica sol (830), wetting agent (JFC), defoamer (n-octanol); the preparation ratio is silica sol and The weight ratio of EC95 (320 mesh) is 1:4, the volume of wetting agent and defoaming agent is 0.12% of silica sol; pour a certain amount of silica sol into the paint bucket, and then add wetting agent and defoaming agent in proportion, At the same time, start the mixer and slowly add EC95 (320 mesh) while stirring. After the stirring time is more than 2 hours, measure the viscosity once or twice during the stirring (the viscosity should be slightly higher than the specified viscosity), and then pour it into the L-shaped mixer and continue stirring for 24 hours before use. . The viscosity requirement is 35-40s.

[0029] 2. Prepare the reinforcement layer coating. The ratio of reinforcement layer preparation is about 1:1.60 between silica sol (1430) and EC95 (320 mesh). The ...

Embodiment 2

[0039]1. Prepare the surface coating, prepare the chemical composition of corundum (320 mesh) powder as shown in Table 1, silica sol (830), wetting agent (JFC), defoamer (n-octanol); the preparation ratio is silica sol The weight ratio to corundum powder (320 mesh) is 1:4, and the wetting agent and defoaming agent are both 0.12% by volume of silica sol; pour a certain amount of silica sol into the paint bucket, and then add wetting agent and defoaming agent in proportion At the same time, start the mixer and slowly add corundum powder (320 mesh) while stirring. After stirring for more than 2 hours, measure the viscosity once or twice during stirring (the viscosity should be slightly greater than the specified viscosity) and then pour it into the L-shaped mixer and continue stirring for 24 hours. available later. The viscosity requirement is 35-40s.

[0040] 2. Prepare the reinforcement layer coating. The ratio of reinforcement layer preparation is about 1:1.6 between silica s...

Embodiment 3

[0050] 1. Prepare the surface coating and prepare the chemical composition of corundum (320 mesh) powder as shown in Table 1, aluminum sol, wetting agent (JFC), defoamer (n-octanol); the preparation ratio is aluminum sol and corundum powder (320 mesh) The weight ratio is 1:3.8, the wetting agent and defoaming agent are both aluminum sol volume 0.15%; pour a certain amount of aluminum sol into the paint bucket, and then add wetting agent and defoaming agent in proportion, at the same time Start the mixer and add corundum powder (320 mesh) slowly while stirring. After stirring for more than 2 hours, measure the viscosity once or twice during stirring (the viscosity should be slightly higher than the specified viscosity), then pour it into the L-shaped mixer and continue stirring for 24 hours before use. . The viscosity requirement is 35-40s.

[0051] 2. Prepare the reinforcement layer coating. The ratio of reinforcement layer preparation is about 1:1.7 between silica sol (1430)...

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Abstract

The invention discloses a preparation method for a ceramic shell for nickel-based superalloy single crystal / directional solidification and belongs the technical field of preparation of ceramic shells. The method comprises the steps of surface layer slurry preparation, reinforcing layer slurry preparation, smearing operation of the shell, dewaxing of the shell and roasting of the shell. Surface layer slurry is composed of emery powder, alumina sol, a wetting agent JFC and a defoaming agent (n-caprylic alcohol); and according to the ratios of all the components, the weight ratio of the alumina sol to the emery powder is 1:(3.5-4.25), and the volume of the wetting agent and the volume of the defoaming agent are 0.1-0.15% of that of the alumina sol. According to the ceramic shell prepared through the method, on the basis that the strength of the shell and the surface quality of a casting are ensured, the situation that the impurity element silicon enters liquid alloy and pollutes alloy in the single crystal directional solidification process is reduced, and thus the casting alloy quality is ensured.

Description

technical field [0001] The invention relates to the technical field of ceramic shell preparation, in particular to a method for preparing a nickel-based superalloy single crystal / ceramic shell for directional solidification, and the method is suitable for preparing a nickel-base superalloy single crystal / ceramic shell for directional solidification. Background technique [0002] The single crystal directional solidification process has been continuously improved and perfected, becoming more and more mature, and has been successfully applied to the manufacture of castings such as aero-engines and industrial gas turbine blades. As the temperature of aviation and gas turbine blades is getting higher and higher, the size of castings is getting larger and larger, so the working conditions of the ceramic shell for directional solidification are very harsh. In contact with alloy liquid, this requires the shell to have high refractoriness, high load softening temperature and thermoc...

Claims

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Application Information

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IPC IPC(8): B22C1/00B22C3/00B22C9/04B22D27/04
CPCB22C1/00B22C3/00B22C9/043B22D27/045
Inventor 郑伟申健卢玉章徐正国楼琅洪张健
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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