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Integrated crucible and mold for low cost 'gamma'-tial castings

A monolithic, crucible technology

Inactive Publication Date: 2003-02-12
ALLIED SIGNAL INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the use of calcium oxide as a crucible material is impractical in commercial and industrial settings

Method used

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  • Integrated crucible and mold for low cost 'gamma'-tial castings
  • Integrated crucible and mold for low cost 'gamma'-tial castings
  • Integrated crucible and mold for low cost 'gamma'-tial castings

Examples

Experimental program
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Effect test

Embodiment 1

[0021] A model turbocharger rotor made of polystyrene plastic was fitted with wax into the recess in the bottom of the graphite crucible to allow the model to be attached to the crucible. The plastic was dipped into a topcoat slurry formulated with yttrium oxide, which is inert to gamma-TiAl. After the dip coating is partially dried and / or cured, ceramic plaster and dip coating are alternately applied to the form and the lower area of ​​the graphite crucible until a shell of the desired thickness is formed. It is then dip-coated several times with a support coating formulated with flint grains and alumina-silicate powder to form figure 1 The overall investment casting mold is shown. The crucible / investment mold containing the plastic turbocharger model was thoroughly dried and fired in air at a temperature close to 1000°C for 0.5 hours. The graphite crucible / turbocharger investment mold assembly was then removed from the furnace while hot, charged with a molten billet of ca...

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PUM

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Abstract

The present invention relates to an integral crucible for casting of reactive metals, which is formed by combining a graphite sleeve and an investment pattern connected thereon, a laminate of alternating layers of facecoat slurry and ceramic stucco are applied to the outside of the pattern to form an investment shell. The layers of the laminate extend over a mating portion of the sleeve. After the shell is calcinated, the investment pattern is vaporized to leave the sleeve and shell, that is an integral crucible.

Description

[0001] Cross References to Related Applications [0002] This application acknowledges the benefit of the filing date of provisional application 60 / 036041, entitled Integral Crucibles and Molds for Low Cost Casting of Gamma-TiAl, filed January 27, 1997. Background of the invention [0003] field of invention [0004] The present invention relates generally to casting crucibles and, more particularly, to a unitary monolithic crucible and investment mold for casting reactive metals, especially reactive metals of complex shape. [0005] Related technical description [0006] Melting and casting of reactive metals such as titanium or titanium aluminide is difficult because the molten metal reacts with crucibles containing alumina, zircon or silicates; This kind of crucible is usually used when working with metals. Turbocharger rotors are usually cast from a nickel superalloy that is conveniently melted and cast using an investment mold w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/04
CPCB22C9/04
Inventor J·C·拉萨勒D·G·杰文斯J·F·赖安
Owner ALLIED SIGNAL INC