Preparation method of in-situ synthesized titanium-aluminum composite material distributed in network shape

An in-situ self-generated, composite material technology, applied in the field of titanium-aluminum composite materials, can solve problems such as large thermal stress and affect mechanical properties, and achieve the effects of hindering crack propagation, good forming surface quality, and high processing efficiency.

Active Publication Date: 2022-07-12
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The parts of SLM forming technology have high forming precision and good surface quality, which can realize the net shape of parts; however, due to repeated rapid heating and cooling during the forming process, large thermal stress is easily generated during forming, and defects such as cracks are difficult to control
Therefore, it is particularly important to introduce the configuration design of the reinforcement phase. The distribution mode of the reinforcement phase will have a great impact on the activation, movement and packing of dislocations in the crystal structure, and then affect the mechanical properties.

Method used

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Examples

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Comparison scheme
Effect test

preparation example Construction

[0018] A preparation method of an in-situ self-generated titanium-aluminum composite material distributed in a network shape, comprising the following steps:

[0019] Step 1, adding graphene nanosheets and dodecylbenzene sulfonic acid into deionized water, and then performing ultrasonic dispersion treatment, so that the monolayer of graphene is uniformly dispersed in the solution to obtain a graphene solution; the thickness of the graphene nanosheets is: 3 to 10 nm, and the sheet diameter is 5 to 10 μm.

[0020] In step 2, the spherical Ti powder and the graphene solution obtained in step 1 are added into absolute ethanol, and then heated and ultrasonically stirred at a temperature of 80° C. until the evaporation of the solution is completed. The remaining solid after evaporation is then put into a vacuum drying oven for drying treatment at a temperature of 60-80° C. and a drying time of 8-10 h to obtain a Ti / graphene composite powder with a graphene coating on the surface.

...

Embodiment 1

[0024] A kind of in situ self-generated Ti with network distribution 2 AlC / TiAl composite material and preparation method thereof, the specific steps are as follows:

[0025] Step 1. Evenly disperse the graphene nanosheets into deionized water, add organic solvent dodecylbenzene sulfonic acid at the same time, the concentration of the graphene solution is 5-10 mg / ml, and obtain monolayer uniformly dispersed graphene by ultrasonic dispersion Solution (the thickness of graphene nanosheets is 3 to 10 nm, and the diameter of the sheets is 5 to 10 μm).

[0026] Step 2. Add the spherical titanium powder and the graphene dispersion obtained in step 1 into absolute ethanol for heating and ultrasonic stirring (80°C). At this time, a graphene coating will be formed on the surface of the TiAl powder. This process is accompanied by ultrasonic stirring. , until the evaporation of the solution is completed, and then drying in a vacuum drying oven (temperature is 60 ℃ ~ 80 ℃, time 8 ~ 10h) ...

Embodiment 2

[0031] This embodiment is the same as the embodiment of steps 1 to 3 in Example 1, except that the laser scanning pitch is 100 μm, the scanning speed is 600 mm / s, and the laser power is 150 W. Compared with Example 1, the grain structure is obviously refined, and the TiAl matrix composite 2 The AlC enhancement phase is still distributed in the network.

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Abstract

A preparation method of an in-situ synthesis titanium-aluminum composite material distributed in a network shape comprises the following steps: adding graphene nanosheets and dodecylbenzene sulfonic acid into deionized water, and then carrying out ultrasonic dispersion treatment to obtain a graphene solution; the spherical Ti powder and the graphene solution are added into absolute ethyl alcohol, then heating ultrasonic stirring and drying treatment are conducted, and Ti / graphene composite powder with a graphene coating on the surface is obtained; and the spherical Al powder and the Ti / graphene composite powder are added into a ball mill to be subjected to ball milling, selective laser melting forming is conducted on the obtained Ti / Al / graphene composite powder, and the in-situ synthesis Ti2AlC / TiAl composite material distributed in a network shape is prepared. According to the method, heating ultrasonic stirring, ball milling and selective laser melting forming are matched with one another, so that an in-situ synthesized Ti2AlC reinforced phase is uniformly distributed in a TiAl matrix in a network shape, the overall deformation coordinating capacity of the material is improved due to the existence of a network structure, cracks are passivated, crack propagation is hindered, and the plasticity and toughness of the material are improved while the strength is improved.

Description

technical field [0001] The invention relates to the field of titanium-aluminum composite materials, in particular to a preparation method of an in-situ self-generated titanium-aluminum composite material distributed in a network. Background technique [0002] As an advanced high-temperature structural material, TiAl alloy has excellent properties such as light weight, high specific strength, high wear resistance, temperature resistance, corrosion resistance, creep resistance and oxidation resistance, and has wide application prospects in the fields of aerospace and armored ships. However, the poor room temperature plasticity of TiAl alloys restricts its wide application. In order to improve the mechanical properties of TiAl alloys, the most common method is to add alloying elements for alloying or to introduce reinforcing phases for composite treatment. At present, with the gradual deepening of the research on MAX phase, its excellent properties promote the development of M...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04B22F10/28B22F1/16C22C1/05C22C32/00B33Y70/10B33Y10/00
CPCC22C1/058B22F9/04B22F10/28C22C32/0052B33Y70/10B33Y10/00B22F2009/043Y02P10/25
Inventor 柳培王振博王爱琴谢敬佩侯博
Owner HENAN UNIV OF SCI & TECH
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