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A kind of titanium/aluminum gradient material and preparation method thereof

A gradient material and particle size technology, applied in the field of high-performance materials and their preparation, can solve the problems of difficulty in obtaining a titanium/aluminum gradient structure, difficult interface reaction control, and high connection temperature, so as to avoid excessive grain growth and ensure uniform composition. The effect of reducing the segregation of components

Active Publication Date: 2018-11-30
CENT SOUTH UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to solve the problem that it is difficult to obtain a titanium / aluminum gradient structure with high bonding strength due to the high connection temperature, large residual stress, and difficult control of interface reactions in the existing preparation process, and to provide a high-performance titanium alloy based on aerospace applications. / Aluminum gradient material and its powder metallurgy preparation method

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  • A kind of titanium/aluminum gradient material and preparation method thereof

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Embodiment 1

[0048] The powder metallurgy preparation method of the high-performance titanium / aluminum gradient material described in this embodiment is carried out according to the following steps:

[0049] Step 1: Powder pretreatment; TC4 powder with a particle size of 58 μm and 2A12 powder with a particle size of 58 μm were dried in an oven at 80° C. for 4 hours.

[0050] Step 2: Molding; a hard alloy mold with a diameter of 40 mm is used, and a layer of stearic acid is pre-coated on the inner wall of the mold to facilitate demoulding. The TC4 powder and the 2A12 powder were respectively placed in the mold for compression molding, and the pressing pressure was 20 MPa, and the holding time was 20 s to obtain titanium matrix and aluminum matrix compacts respectively, and the thickness of the prepared matrix was 10 mm.

[0051] Step 3: Sintering and densification of the titanium substrate; firstly, the temperature is raised from room temperature to 600°C at a heating rate of 10°C / min and k...

Embodiment 2

[0057] The powder metallurgy preparation method of the high-performance titanium / aluminum gradient material described in this embodiment is carried out according to the following steps:

[0058] Step 1: Powder pretreatment; TC4 powder with a particle size of 45 μm and 2A12 powder with a particle size of 58 μm were dried in an oven at 80° C. for 4 hours.

[0059] Step 2: Molding; a hard alloy mold with a diameter of 40 mm is used, and a layer of stearic acid is pre-coated on the inner wall of the mold to facilitate demoulding. The TC4 powder and the 2A12 powder were respectively placed in the mold for compression molding, and the pressing pressure was 10 MPa, and the holding time was 30 s to obtain titanium matrix and aluminum matrix compacts respectively, and the thickness of the prepared matrix was 15 mm.

[0060] Step 3: Sintering and densification of the titanium substrate; firstly, the temperature was raised from room temperature to 600°C at a heating rate of 10°C / min and ...

Embodiment 3

[0066] The powder metallurgy preparation method of the high-performance titanium / aluminum gradient material described in this embodiment is carried out according to the following steps:

[0067] Step 1: Powder pretreatment; TC4 powder with a particle size of 48 μm and 2A12 powder with a particle size of 53 μm were dried in an oven at 80° C. for 6 hours.

[0068] Step 2: Molding; a cemented carbide mold with a diameter of 20 mm is used, and a layer of stearic acid is pre-coated on the inner wall of the mold to facilitate demoulding. The TC4 powder and the 2A12 powder were respectively placed in the mold for compression molding, and the pressing pressure was 10 MPa, and the holding time was 30 s to obtain titanium matrix and aluminum matrix compacts respectively, and the thickness of the prepared matrix was 15 mm.

[0069] Step 3: Sintering and densification of the titanium substrate; first, the temperature was raised from room temperature to 600°C at a heating rate of 10°C / min ...

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Abstract

The invention relates to a high-performance material based on aerospace application and a preparation method, in particular to a powder metallurgy preparation technology of a titanium / aluminum gradient material, and aims to solve the problem of difficult obtaining of a titanium / aluminum gradient structure with high bonding strength due to high joining temperature, high residual stress and difficult interface reaction control in a traditional preparation process. A titanium sintering body and an aluminum presintering body are prepared by a powder metallurgy forming and sintering method; and then, two prefabricated bodies are laminated to be subjected to powder metallurgy sintering to obtain the high-performance titanium / aluminum gradient material. The obtained high-performance titanium / aluminum gradient material has no obvious matrix deformation, and reaches the interface stretching resistant strength of not less than 100 MPa. The preparation method is suitable for preparation of larger-size titanium / aluminum gradient material, and can be expanded to other dissimilar metal gradient structure. The preparation method is simple in operation, easy to control and convenient for industrial application.

Description

technical field [0001] The invention relates to a high-performance material based on aerospace applications and a preparation method thereof, in particular to a titanium / aluminum gradient material and a preparation method thereof. Background technique [0002] In the field of aerospace, researchers have higher and higher requirements for reducing fuel consumption, increasing loading capacity and range, so lightweight structures have become an inevitable trend. Both titanium and aluminum have excellent properties such as low density, high specific strength and high specific stiffness, and are currently the most widely used lightweight metal materials in the aerospace field. The development of lightweight titanium / aluminum gradient structures can effectively reduce the overall mass of all titanium structures. At the same time, the performance advantages of the two materials can be brought into full play. In addition, the density gradient characteristics of the new titanium / al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F7/02B22F3/16C22C1/04
CPCB22F3/16B22F7/02C22C1/0416C22C1/0458
Inventor 刘文胜龙路平马运柱伍镭刘超刘阳
Owner CENT SOUTH UNIV
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