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Mold shell for precision casting or directional solidification of TiAl-based alloy and method for manufacturing mold shell

A technology of precision casting and directional solidification, applied in casting molding equipment, metal processing equipment, casting molds, etc., can solve problems such as alloy pollution, and achieve the effect of thin pollution layer, stable performance and high melting point

Inactive Publication Date: 2016-06-08
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the TiAl-based alloy melt has high chemical activity, and it is easy to react with the shell material in the process of investment casting or directional solidification, causing pollution to the alloy, which limits the application of investment casting or directional solidification investment casting technology in TiAl-based alloys. Applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Ti-47Al-2Cr-2Nb (at.%) alloy precision casting mold shell and its preparation method

[0032] Step 1: Prepare formwork inert layer slurry

[0033] The slurry is composed of yttrium oxide powder, alumina powder, aluminum sol, dispersant, surfactant and defoamer, wherein, yttrium oxide powder and alumina powder account for 60% of the total weight of the slurry, and Al2O3 powder accounts for the total weight of the powder. The volume ratio is 30%. The aluminum sol accounts for 39% of the total weight of the slurry, the defoamer accounts for 0.4% of the total weight of the slurry, the dispersant accounts for 0.4% of the total weight of the slurry, and the surfactant accounts for 0.2% of the total weight of the slurry.

[0034] The particle size of the yttrium oxide powder used to prepare the inert layer slurry in this step is 280 mesh, the particle size of the alumina powder is 500 mesh, and the slurry flow cup viscosity of the surface layer and the surface layer is 55s. ...

Embodiment 2

[0056] Ti-46Al-8Nb (at.%) alloy directionally solidified formwork and its preparation method;

[0057] Step 1: Prepare formwork inert layer slurry

[0058] The slurry is composed of yttrium oxide powder, alumina powder, aluminum sol, dispersant, surfactant and defoamer, wherein, yttrium oxide powder and alumina powder account for 80% of the total weight of the slurry, and Al2O3 powder accounts for the total weight of the powder. The ratio of the amount is 10%. The aluminum sol accounts for 19% of the total weight of the slurry, the defoamer accounts for 0.3% of the total weight of the slurry, the dispersant accounts for 0.5% of the total weight of the slurry, and the surfactant accounts for 0.2% of the total weight of the slurry.

[0059] The particle size of the yttrium oxide powder used to prepare the inert layer slurry in this step is 320 mesh, the particle size of the alumina powder is 400 mesh, and the flow cup viscosity of the surface layer and the surface layer slurry ...

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PUM

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Abstract

The invention belongs to the technical field of manufacturing of precision investment casting mold shells, and relates to a mold shell for precision casting or directional solidification of a TiAl-based alloy and a method for manufacturing the mold shell. In slurry of a surface layer and a critical surface layer of the mold shell involved in the method, alumina sol serves as a binder, and high-purity electric smelting yttrium oxide powder and electric smelting white corundum powder serve as fireproof filler; and at least one of Y2O3 and three kinds of yttrium-aluminum oxide, namely, Y3Al5O12, Y4Al2O9 and YAlO3, serves as ingredients of the surface layer of the mold shell obtained after roasting. The mold shell is manufactured through the precision investment casting technology, and the procedures of mold waxing, slurry hanging, sand spreading, dewaxing, roasting and the like are included. The slurry of the mold shell is stable in performance, good in smearing, hanging and flowing performance and easy to store; the mold shell has the beneficial effects of being high in chemical stability, excellent in high-temperature strength, thermal shock resistance and high-temperature creep resistance and the like; and the TiAl-based alloy obtained through precision casting or directional solidification is smooth in surface, and a pollution layer is thin.

Description

technical field [0001] The invention relates to a mold shell for TiAl-based alloy precision casting or directional solidification and a method for preparing the mold shell, belonging to the technical field of investment precision casting mold shell preparation. Background technique [0002] TiAl-based intermetallic compounds have a high melting point (1460°C), low density (3.9-4.2g / cm 3 ), excellent high temperature strength, creep resistance and oxidation resistance, etc., it is the only candidate weight-reducing structural material in the temperature range of 850 ° C to 1050 ° C, and has a very good application prospect in the field of aero-engines. TiAl-based alloy investment precision casting technology can realize nearly no margin or even no margin integral forming of parts of any shape, and is the preferred method for preparing TiAl-based alloy parts. Studies have shown that the properties of TiAl-based alloys are very sensitive to the structure, and the orientation o...

Claims

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Application Information

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IPC IPC(8): B22C9/04C04B35/505C04B35/10C04B35/632C04B35/638
CPCB22C9/04C04B35/10C04B35/505C04B35/62685C04B35/632C04B35/638C04B2235/3217C04B2235/3218C04B2235/3225C04B2235/5418C04B2235/6562C04B2235/75
Inventor 崔永双柴丽华相志磊陈子勇
Owner BEIJING UNIV OF TECH
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