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.
CN104907495AInactive Publication Date: 2015-09-16HARBIN INST OF TECH
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
HARBIN INST OF TECH
Publication Date
2015-09-16
Estimated Expiration
Not applicable ยท inactive patent

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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.
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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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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