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Surface tin removing method for liquid metal cooling and directional solidifying blade

A liquid metal cooling and directional solidification technology, applied in the field of superalloys, which can solve problems such as difficulty in removal

Active Publication Date: 2016-03-02
威海凯宏新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually this layer of tin is very thin and firmly attached to the blade surface, making it very difficult to remove

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The precision casting process is used to prepare the blade formwork. The surface coating is prepared by corundum powder (320 mesh) and silica sol solution. The powder-to-liquid ratio is 3.5:1. After the first layer of coating, it is dried at room temperature for 8 hours; Sanding after the second layer of paint, the sanding material is 80 mesh corundum sand, and the drying time is 8 hours; the sanding material after the third layer of paint is 60 mesh corundum sand, and the drying time is 8 hours; the sanding material after the fourth layer of paint It is 32 mesh corundum sand, and the drying time is 8 hours; the fifth-seventh layer is 24 mesh corundum sand, and the drying time is 8 hours. The final sealing layer is surface coating, and the drying time is 8 hours. ;Remove the wax mold by steam method, the steam temperature is 170 °C, and the time is 20 minutes; after the mold shell is dewaxed, put the mold shell into a roasting furnace for roasting, the roasting temperatu...

Embodiment 2

[0018] The precision casting process is used to prepare the blade formwork. The surface coating is prepared by corundum powder (320 mesh) and silica sol solution. The powder-to-liquid ratio is 3.5:1. After the first coating is dried at room temperature, the drying time is 4 hours; Sprinkle sand after the second layer of paint, the sanding material is 60 mesh corundum sand, and the drying time is 4 hours; the sanding material after the third layer of paint is 60 mesh corundum sand, and the drying time is 4 hours; the sanding material after the fourth layer of paint It is 32 mesh corundum sand, and the drying time is 4 hours; the fifth-seventh layer is 24 mesh corundum sand, and the drying time is 4 hours. ;Remove the wax mold by steam method, the steam temperature is 170°C, and the time is 10 minutes; after the mold shell is dewaxed, put the mold shell into a roasting furnace for roasting, the roasting temperature is 850°C, the holding time is 6 hours, and the furnace is cooled ...

Embodiment 3

[0020] The precision casting process is used to prepare the blade formwork. The surface coating is prepared by corundum powder (320 mesh) and silica sol solution. The powder-to-liquid ratio is 3:1. After the first layer of coating, it is dried at room temperature for 8 hours; Sanding after the second layer of paint, the sanding material is 80 mesh corundum sand, and the drying time is 4 hours; the sanding material after the third layer of paint is 60 mesh corundum sand, and the drying time is 4 hours; the sanding material after the fourth layer of paint It is 24 mesh corundum sand, and the drying time is 4 hours; the fifth-seventh layer is coated with 16 mesh corundum sand, and the drying time is 4 hours. The final sealing layer adopts surface coating, and the drying time is 6 hours. ;Remove the wax mold by steam method, the steam temperature is 150°C, and the time is 20 minutes; after the mold shell is dewaxed, put the mold shell into a roasting furnace for roasting, the roast...

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PUM

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Abstract

The invention provides a surface tin removing method for a liquid metal cooling and directional solidifying blade. The method comprises the following process route that 1, a blade mold shell is manufactured through a precision casting process, and a directional column crystal or single crystal blade is manufactured through the liquid Sn cooling and directional solidifying technology; 2, the blade mold shell is cleaned; 3, the blade obtained after shell cleaning is placed in a high-pressure depoling kettle, alkali liquor is injected into the depoling kettle, and tin removal is carried out at certain temperature and pressure; and 4, the surface of the blade obtained after tin removal is neutralized and cleaned with an acid solution, the blade is dried finally, and the blade with the surface free of tin is obtained. Based on the theory that high-temperature alloy does not react with the alkali liquor, and tin and the alkali liquor react to generate salt capable of being dissolved in water, tin on the surface of the blade is removed, and the aim of removing tin on the surface of the blade is achieved.

Description

technical field [0001] The invention belongs to the technical field of high-temperature alloys, and in particular relates to a preparation process for directional solidification blades of high-temperature alloys. Background technique [0002] At present, the directional solidification technology of nickel-based superalloys, which is relatively mature in industry, mainly adopts high-speed solidification (High Rate Solidification, HRS) and liquid metal cooling (Liquid Metal Cooling, LMC) methods. The traditional HRS method increases the temperature gradient by moving the shell shape, and the temperature gradient is generally 20-40°C / cm. The specific method is to place the mold shell on the water-cooled chassis, and use a radiation baffle to isolate the hot zone. After the growth of the single crystal starts, the shell is moved out of the hot zone through the radiation baffle at a preset speed. The notable feature of LMC technology is to use liquid metal as a cooling medium to...

Claims

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Application Information

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IPC IPC(8): B22C9/04B22D29/00B22D31/00
CPCB22C9/04B22D29/002B22D31/002
Inventor 毛萍莉姜卫国
Owner 威海凯宏新材料有限公司