Preparation method of TiAl-base alloy

A technology of base alloy and purpose, applied in the field of high-temperature structural material preparation, can solve the problems of volume expansion, different diffusion coefficients, difficulty in guaranteeing alloy composition uniformity and structure uniformity, etc., and achieves the effect of high cost.

Inactive Publication Date: 2014-02-12
GUANGZHOU RES INST OF NON FERROUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the diffusion coefficients of Al and Ti are different, the volume expansion is easy to occur during the sintering process, and the uniformity of composition and structure of the alloy is difficult to guarantee.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] 300 mesh TiAl 3 Powder and 500 mesh Ti powder are mixed according to the mass ratio of 1:2, and mixed on the powder mixer for 72 hours to obtain a uniformly mixed powder; after the uniformly mixed powder is cold pressed into a blank under a pressure of 800 MPa, the vacuum degree is 5× 10 -2 The low-carbon steel sleeve is sealed under Pa; the cold-pressed billet with the low-carbon steel sleeve is heated to 1050℃ at a heating rate of 50℃ / min, and after holding for 30 minutes, it is placed in a mold for extrusion forming to obtain a density of 98% , TiAl-based alloy with an average grain size of 20μm and a compressive strength of 1800MPa.

Embodiment 2

[0014] 300 mesh TiAl 3 Powder and 500 mesh Ti powder are mixed according to the mass ratio of 1:3, and mixed on a powder mixer for 72 hours to obtain a uniformly mixed powder; after the uniformly mixed powder is cold pressed into a compact under a pressure of 800MPa, the vacuum degree is 5× 10 -2 The low-carbon steel sleeve is sealed under Pa; the cold-pressed billet with the low-carbon steel sleeve is heated to 1050℃ at a heating rate of 50℃ / min, and after holding for 30 minutes, it is placed in a mold for extrusion forming to obtain a density of 98% , TiAl-based alloy with an average grain size of 20μm and a compressive strength of 1850MPa.

Embodiment 3

[0016] 300 mesh TiAl 3 Powder and 500 mesh Ti powder are mixed according to the mass ratio of 1:2, and mixed on the powder mixer for 72 hours to obtain a uniformly mixed powder; after the uniformly mixed powder is cold pressed into a blank under a pressure of 800 MPa, the vacuum degree is 5× 10 -2 The low-carbon steel sleeve is sealed under Pa; the cold-pressed billet with low-carbon steel sleeve is heated to 1150℃ at a heating rate of 50℃ / min, and after holding for 30 minutes, it is placed in a mold for extrusion to obtain a density of 99% , TiAl-based alloy with an average grain size of 25μm and a compressive strength of 2102MPa.

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Abstract

The invention discloses a preparation method of a TiAl-base alloy. The preparation method is characterized by comprising the following steps: (1) evenly mixing TiAl3 powder with the granularity of 300 meshes and Ti powder with the granularity of 500 meshes at a mass ratio of (1:2)-(1:5); (2) performing cold pressing on the mixture under a pressure of 800MPa so as to obtain billets and encapsulating the billets into a low-carbon steel sleeve when the vacuum degree is 5*10<-2>Pa; (3) heating the cold-pressed billets with the low-carbon steel sleeve to 1050-1250 DEG C at a heating speed of 50 DEG C/min, and putting the cold-pressed billets with the low-carbon steel sleeve into a mold to extrude and form after carrying out heat preservation for 30-60 minutes. The preparation method is simple in process and low in cost; the problem of high cost of a pre-alloying method is solved; meanwhile, the problem of volume expansion when the TiAl alloy is prepared from Ti and Al elements by a powder method is avoided; the TiAl-base alloy with high compactness and even and fine tissue can be obtained.

Description

Technical field [0001] The invention belongs to the technical field of preparation of high-temperature structural materials, and particularly relates to a preparation method of a TiAl-based alloy. Background technique [0002] TiAl-based alloys have a series of characteristics necessary for high-temperature structural materials, which have attracted the attention of a large number of scientific researchers. Countries have also invested a lot of manpower, material resources, and financial resources in research and have achieved some results. TiAl-based alloy has outstanding advantages such as light density, high temperature resistance, and oxidation resistance. It has shown a very broad application prospect in the aerospace field and has become the material of choice for advanced military aircraft engine compressors and low-pressure turbine blades. [0003] Investment casting is currently the most widely used TiAl-based alloy forming technology. It can cast complex shapes and thin-w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C14/00
Inventor 李达人韩胜利崔利群蔡一湘
Owner GUANGZHOU RES INST OF NON FERROUS METALS
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