Preparation method of carbide-reinforced TiAl-based nano composite material

A nano-composite material and carbide technology, applied in additive processing, additive manufacturing, metal processing equipment, etc., can solve problems such as reduced power supply life, material porosity, powder unfused, etc., to optimize distribution uniformity and increase lubrication. Wetness, agglomeration reduction effect

Pending Publication Date: 2021-08-06
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This results in partially unfused powder, porous interior material, and reduced density
In severe cases, the preparation process will be terminated and the life of the power supply will be reduced

Method used

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  • Preparation method of carbide-reinforced TiAl-based nano composite material
  • Preparation method of carbide-reinforced TiAl-based nano composite material
  • Preparation method of carbide-reinforced TiAl-based nano composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A carbide-reinforced TiAl-based nanocomposite material and a preparation method thereof. The high-Nb-TiAl alloy is used as a matrix, and TiC ceramic particles with a purity of more than 99.9% and an average particle size of 200nm are used as additional particles.

[0035] The matrix material is a high Nb-TiAl alloy powder with a particle size of 45-150 μm, and the D50 is 87 μm. It is prepared by a plasma rotating electrode method. The chemical composition of the high Nb-TiAl alloy is: 47.17at.%Al, 7.41at.%Nb, 0.86at.%Cr, 1.90at.%V, the balance is Ti.

[0036] Described a kind of carbide reinforced TiAl-based nanocomposite material and its preparation method, the steps are as follows:

[0037] (1) Using TiC ceramic particles and TiAl alloy powder as raw materials, the added TiC content is 0.7wt.%;

[0038](2) The two materials are mixed by a mechanical ball milling method to obtain a premixed powder in which TiC nanoparticles are evenly distributed on the surface of the...

Embodiment 2

[0050] What is different from Example 1 is: the preheating process is two-step preheating in the belonging step (3), the scanning speed of the first step preheating is 16000mm / s, and the electric current is 22mA, and the scanning speed of the second step preheating is 18000mm / s, the current is 22mA, and the forming temperature is kept at 1030°C. The scanning speed used in the semi-melting process is 4000mm / s, the current is 7mA, the line spacing is 0.03mm, and the defocus is 50mA. The scanning speed of the melting process is 11000mm / s, the current is 10mA, the line spacing is 0.02mm, and the defocus is 20mA. Others remain unchanged.

[0051] image 3 Shown is the SEM photo of the microstructure of the carbide-reinforced TiAl-based nanocomposite prepared in Implementation 2. It can be seen that the microstructure of the TiAl alloy matrix prepared by EBM is uniform and is a two-state structure. The black particles are carbides dispersed on the matrix at the nanometer scale. ...

Embodiment 3

[0054] The difference from Example 2 is that the scanning speed of the melting process in step (3) is 8000mm / s, the current is 10mA, the line spacing is 0.05mm, and the defocus is 20mA. Others remain unchanged.

[0055] After testing, the carbide-reinforced TiAl-based nanocomposite prepared in Example 3 has a microhardness of 440HV 0.2 , The tensile strength is 568MPa, the compressive yield strength is 1160MPa, the compressive strength is 2795MPa, and the compressive breaking strain is 24.8%.

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Abstract

The invention discloses a preparation method of a carbide-reinforced TiAl-based nano composite material. The preparation method comprises the following steps: (1) selecting TiC ceramic particles with the purity of more than 99.9% and the particle size of 50-500 nm and TiAl alloy powder with the particle size of 45-150 [mu]m as raw materials; (2) mixing the two kinds of materials through a mechanical ball milling method, and obtaining premixed powder with TiC nano-particles evenly distributed on the surface of the TiAl alloy powder, wherein the weight of the TiC nano-particles accounts for 0.7-1.2 wt.% of the total weight of the mixed powder; and (3) preparing the TiAl-based nano composite material through layer-by-layer forming by means of the electron beam melting technology till a three-dimensional block sample is machined. A semi-melting step is added in the electron beam melting forming process, and finally the nearly-fully-compact carbide-reinforced TiAl-based nano composite material is obtained. In the forming process, the adjustable range of technological parameters is large, a matrix microscopic structure is uniform, a reinforcing phase is fine and dispersively distributed, and the mechanical property is good. The preparation method of the TiAl-based nano composite material has the characteristics and advantages of electron beam additive manufacturing, so that the preparation method has huge application potential in the field of aerospace.

Description

technical field [0001] The invention belongs to the technical field of TiAl-based composite materials and additive manufacturing, and relates to a forming process of carbide-reinforced TiAl-based nano-composite materials added with TiC ceramic nanoparticles based on electron beam melting technology. Background technique [0002] Due to its high specific elastic modulus, specific strength, good high temperature oxidation resistance and high temperature creep resistance, TiAl alloy has great application prospects in aerospace structural materials. However, the intrinsic brittleness and difficult processing limit its large-scale application. Nanoparticle composite is expected to improve the mechanical properties of TiAl alloy. Ti 2 The AlC phase has good toughness and can effectively hinder crack growth. Compared with graphite and carbon nanotubes, the composite material prepared by adding TiC as carbon source to TiAl alloy can obtain higher hardness and strength. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F10/28B22F9/04B22F1/00B22F1/02C22C1/05B33Y10/00B33Y70/10B33Y80/00
CPCB22F1/0003B22F9/04B33Y10/00B33Y70/10B33Y80/00C22C1/0458C22C1/05B22F2009/043B22F1/16
Inventor 林均品高博洋彭徽梁永锋罗呼学
Owner UNIV OF SCI & TECH BEIJING
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