Method for preparing TiAl alloy bars

A technology of alloy rods and aluminum-silicon alloys, which is applied in the field of alloy rod preparation, can solve the problems of low density, difficulty in hot extrusion of TiAl alloy rods, and easy introduction of impurities into TiAl alloy rods, so as to reduce the production cost , easy to squeeze, fine tissue effect

Inactive Publication Date: 2011-09-21
HARBIN INST OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the problems of difficult hot extrusion of TiAl alloy rods prepared by the existing casting metallurgy method, easy introduction of impurities and low density of TiAl alloy rods prepared by powder metallurgy, and provides a preparation method of TiAl alloy rods. method

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  • Method for preparing TiAl alloy bars
  • Method for preparing TiAl alloy bars

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specific Embodiment approach 1

[0009] Specific embodiment one: the preparation method of the TiAl alloy bar of this embodiment is carried out according to the following steps: 1. Add spherical titanium powder with a mass purity ≥ 99.5% into a steel mold, and cold press it into a porosity of 45% to 55%. % of the block, and then put the block into the vacuum sintering furnace, pump the vacuum degree of the vacuum sintering furnace to 0.005Pa ~ 0.01Pa, then raise the temperature to 900°C ~ 1200°C and keep it for 1h ~ 3h to obtain the porous titanium prefabricated Two, the porous titanium prefabricated body is placed in the steel mould, and the mol ratio of the titanium in the porous titanium prefabricated body obtained through step 1 and the aluminum in the aluminum-silicon alloy is 1: 1 to take the aluminum-silicon alloy, And place the aluminum-silicon alloy on the porous titanium prefabricated body in the steel mold to form a hot-pressed part; 3. Put the hot-pressed part formed in step 2 into a vacuum hot-pre...

specific Embodiment approach 2

[0012] Embodiment 2: This embodiment differs from Embodiment 1 in that: the particle size of the spherical titanium powder in step 1 is 100 μm-150 μm. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0013] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the particle size of the spherical titanium powder described in step 1 is 120 mm. Others are the same as in the first or second embodiment.

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Abstract

The invention provides a method for preparing TiAl alloy bars, relating to a method for preparing alloy bars. The invention solves the problem of difficult hot extrusion in preparation of the TiAl alloy bars by the existing casting metallurgical method and the problems of easy introduction of impurities and low compactness of the TiAl alloy bars prepared by the powder metallurgical method. The method of the invention is as follows: 1) preparing Ti powder into porous Ti by cold compressing and sintering; 2) forming a hot-pressing piece by the porous Ti and alusil alloy; 3) preparing Ti-Al bimetal complexes by using a vacuum pressure infiltration method; 4) extruding to obtain Ti-Al bimetal composite bars; and 5) performing heat treatment to obtain the TiAl alloy bars. In the invention, theextrusion operation of the bars is carried out at lower temperature, the bar has the advantages that the extrusion is easy, no ball milling process is needed, the impurities are less, the tissues of the bars are uniform and fine, the compactness is 97-99%, and the tensile strength is 730-780 MPa, thereby be capable of being used in the fields of aviation, spaceflight and automobile.

Description

technical field [0001] The invention relates to a method for preparing alloy rods. Background technique [0002] TiAl alloy is a new generation of light-weight and high-temperature-resistant structural materials. It has the advantages of high melting point, low density, high-temperature strength, good flame retardancy and oxidation resistance, and is widely used in aerospace and automotive fields. There are two main methods for preparing TiAl alloy rods. One is to use casting metallurgy technology. First, the raw materials are cast and cut to obtain billets, and then the billets are extruded into TiAl alloys at a temperature of 1250 ° C to 1400 ° C. Alloy rods, brittle TiAl-based alloy ingots obtained by casting have a high hot extrusion deformation temperature, and extrusion is extremely difficult; the second is to use powder metallurgy technology, firstly press the raw material powder into shape, and then use static pressure or sintering for densification Processing, this...

Claims

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Application Information

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IPC IPC(8): C22C1/04
Inventor 李爱滨梁策耿林张杰李峰崔喜平
Owner HARBIN INST OF TECH
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