Preparation method of TiAl alloy investment casting shell

A technology of investment casting and alloying, which is applied in casting molding equipment, molds, mold components, etc., and can solve the problems of serious interface reaction and high cost.

Inactive Publication Date: 2015-09-16
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of high cost and serious interface reaction of the existing TiAl alloy investment casting ceramic shell, and provide a preparation method for the TiAl alloy investment casting shell

Method used

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  • Preparation method of TiAl alloy investment casting shell
  • Preparation method of TiAl alloy investment casting shell
  • Preparation method of TiAl alloy investment casting shell

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Experimental program
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specific Embodiment approach 1

[0029] Specific embodiment one: the preparation method of a kind of TiAl alloy investment casting mold shell of this embodiment is carried out according to the following steps

[0030] 1. Preparation of surface layer slurry: Add defoamer and wetting agent to ammonium zirconium carbonate at a stirring speed of 20r / min to 40r / min to obtain a mixed solution, and then add it at a speed of 200g / min to Add ZrO to the mixture at 300g / min 2 and CaCO 3 , Stir and mix until the ZrO 2 and CaCO 3 Uniformly disperse in the mixed liquid, then stir for 22h-24h at a stirring speed of 80r / min-100r / min, and then stand still for 8h-12h to obtain the surface layer slurry;

[0031]The ZrO 2 with CaCO 3 The mass ratio of (1.0 ~ 1.5): 1; the ZrO 2 with CaCO 3 The mass ratio of the sum of the masses of zirconium carbonate to ammonium zirconium carbonate is (2.5~3.0): 1; the mass ratio of described ammonium zirconium carbonate to defoamer is 100: (0.05~0.2); The mass ratio of wet agent is 100:...

specific Embodiment approach 2

[0046] Specific embodiment two: the difference between this embodiment and specific embodiment one is: ZrO described in step one 2 The particle size is 320 mesh. Other steps and parameters are the same as those in the first embodiment.

specific Embodiment approach 3

[0047] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the CaCO described in step one 3 The particle size is 320 mesh. Other steps and parameters are the same as those in Embodiment 1 or 2.

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Abstract

The invention provides a preparation method of a TiAl alloy investment casting shell. The preparation method of the TiAl alloy investment casting shell aims at solving the problems of high cost and heavy interface reaction of the existing TiAl alloy investment casting ceramic shell. The method comprises the steps of 1, preparing the slurry of a surface layer, 2, preparing a surface-layer shell, 3, preparing an impending surface-layer shell, 4, preparing a back-layer shell, 5, sealing, and 6, dewaxing and roasting. The preparation method is used for remarkably reducing the degree of the TiAl alloy investment casting interface reaction and achieving the purposes of reducing the TiAl alloy investment casting cost and reducing the interface reaction. The shell casting is bright in surface without obvious sand burning; the thickness of the interface reaction is about 30 microns and the interface reaction degree is weaker than that of the traditional shell.

Description

technical field [0001] The invention relates to a method for preparing a TiAl alloy investment casting mold shell. Background technique [0002] Due to its low density, high specific strength, high temperature creep resistance and oxidation resistance, TiAl alloy has broad application prospects in aerospace and industrial fields. The preparation methods of TiAl alloy can be divided into three typical preparation routes: powder metallurgy, ingot metallurgy + thermomechanical treatment and precision casting. The preparation of TiAl alloy by investment casting has incomparable advantages over other processes, especially in the production of thin-walled components with complex shapes. Loss, improve material utilization. General Electric Company of the United States has designed and manufactured TiAl alloy investment castings in the 1990s and applied them to civil aircraft. With the development of the past 20 years, TiAl alloy investment casting technology has become more and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22C1/00
Inventor 陈玉勇曹守臻肖树龙韩建超贾燚
Owner HARBIN INST OF TECH
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