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Method for preparing Si-Al-Y composite infiltrated layer on surface of Ti2AlNb alloy by two-step method

A compound infiltration and alloying technology, which is applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problems of reduction, resource waste and benefit, and achieve the effect of low process cost and strong practicability

Active Publication Date: 2017-10-20
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the Si-Al-Y infiltrated layer is prepared by the embedding co-infiltration method, in order to obtain the infiltrated layer with the designed structure, the ratio of the element powder to be infiltrated in the infiltrated agent and other process parameters (such as catalyst type, temperature, etc.) are required. , time, etc.) to carry out a lot of exploration, even if the thermodynamic calculation of the co-infiltration process can be carried out with the help of software such as ChemSage, HSC or Thermo-Cacl before the experiment, so as to optimize its parameters, but due to the diffusion of various elements and phase in the subsequent preparation process Forming the difference between thermodynamics and kinetics, many experiments are still needed to determine the optimal conditions of multi-component co-infiltration, which has caused the waste of resources and the reduction of benefits in the scientific research process (Zhang Ping. Nb-Si-based alloy Si Microstructure and oxidation resistance of -Al-Y diffusion layer. Xi'an: Northwestern Polytechnical University, 2014.)

Method used

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  • Method for preparing Si-Al-Y composite infiltrated layer on surface of Ti2AlNb alloy by two-step method
  • Method for preparing Si-Al-Y composite infiltrated layer on surface of Ti2AlNb alloy by two-step method
  • Method for preparing Si-Al-Y composite infiltrated layer on surface of Ti2AlNb alloy by two-step method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The first step: preparation of Si-Y co-infiltration layer

[0051] (1) Put Ti 2 AlNb-based alloy samples are wire-cut into cuboid samples of 10mm×10mm×5mm, and each surface is cut with 80-1500 # Sand with SiC water sandpaper step by step, after ultrasonic cleaning in absolute ethanol for 10 minutes, dry it for later use; (2) prepare penetrating agent. The components of the penetrating agent are 15%Si-2%Y by weight percentage 2 o 3 -8%NaF-75%Al 2 o 3 , where Si powder and Y 2 o 3 The particle size of powder is 100 mesh, Al 2 o 3 The particle size of the powder is 200 mesh; (3) Put the prepared penetrating agent in a ball mill and grind it at 200r / min for 3 hours to make it fully mixed; (4) Put the penetrating agent in an oven with a temperature of 100°C to keep warm Dry for 1 hour; (5) Put half of the dried infiltration agent into the crucible and compact it, embed the cleaned and dried sample in the infiltration agent, cover with the other half of the infiltrat...

Embodiment 2

[0056] The first step: preparation of Si-Y co-infiltration layer

[0057] (1) Put Ti 2 AlNb-based alloy samples are wire-cut into cuboid samples of 10mm×10mm×5mm, and each surface is cut with 80-1500 # Sand with SiC water sandpaper step by step, after ultrasonic cleaning in absolute ethanol for 10 minutes, dry it for later use; (2) prepare penetrating agent. The components of the penetrating agent are 10%Si-3%Y by weight percentage 2 o 3 -8%NaF-79%Al 2 o 3 , where Si powder and Y 2 o 3 The particle size of powder is 100 mesh, Al 2 o 3 The particle size of the powder is 200 mesh; (3) Put the prepared penetrating agent in a ball mill and grind it at 200r / min for 3 hours to make it fully mixed; (4) Put the penetrating agent in an oven with a temperature of 100°C to keep warm Dry for 1 hour; (5) Put half of the dried infiltration agent into the crucible and compact it, embed the cleaned and dried sample in the infiltration agent, cover with the other half of the infiltrat...

Embodiment 3

[0062] The first step: preparation of Si-Y co-infiltration layer

[0063] (1) Put Ti 2 AlNb-based alloy samples are wire-cut into cuboid samples of 10mm×10mm×5mm, and each surface is cut with 80-1500 # Sand with SiC water sandpaper step by step, after ultrasonic cleaning in absolute ethanol for 10 minutes, dry it for later use; (2) prepare penetrating agent. The components of the penetrating agent are 15%Si-3%Y by weight percentage 2 o 3 -8%NaF-74%Al 2 o 3 , where Si powder and Y 2 o 3 The particle size of the powder is 100 mesh, Al 2 o 3 The particle size of the powder is 200 mesh; (3) Put the prepared penetrating agent in a ball mill and grind it at 200r / min for 3 hours to make it fully mixed; (4) Put the penetrating agent in an oven with a temperature of 100°C to keep warm Dry for 1 hour; (5) Put half of the dried infiltration agent into the crucible and compact it, embed the cleaned and dried sample in the infiltration agent, cover with the other half of the infil...

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Abstract

The invention relates to a method for preparing a Si-Al-Y composite infiltrated layer on the surface of Ti2AlNb alloy by a two-step method. The method comprises the following steps: arranging Si-Y2O3 on the surface of Ti2AlNb-based alloy in a pack infiltration manner; and then carrying out Al pack cementation to prepare a high-temperature-resistant oxidized infiltrated layer with certain Si, Al and Y contents on the surface. A one-step Si-Al-Y infiltration process is divided into two steps or multiple steps, and although a preparation process of the infiltrated layer is slightly complicated, element infiltration procedures can be adjusted flexibly according to characteristics of various elements about to be infiltrated. In every procedure, process parameters such as the type, the temperature and the time of a catalyst can be selected in a targeted manner according to physical and chemical properties of the infiltrated elements, and therefore, the infiltrated layer with a designed structure can be easily obtained.

Description

technical field [0001] The invention belongs to the technical field of metal material surface modification and relates to a Ti 2 Method for preparing Si-Al-Y composite impregnated layer by two-step method on AlNb alloy surface Background technique [0002] Ti 2 AlNb-based alloys are in α-Ti 3 Developed on the basis of Al, an intermetallic compound based on an ordered orthorhombic structure O phase. Relative to Ti with low Nb content 3 Al, this O-phase alloy with high Nb content has higher strength (especially high temperature yield strength), fracture toughness and creep resistance, and low notch sensitivity. But at high temperature, too high Nb content (above 15%) will lead to Al in the oxide film 2 o 3 The volume fraction of the decrease, the increase of non-protective oxides, such as AlNbO 4 , a stable protective oxide layer cannot be formed on the alloy surface. [0003] Applying a protective coating on the surface of the alloy is an important method to improve t...

Claims

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Application Information

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IPC IPC(8): C23C10/58
CPCC23C10/58
Inventor 谢发勤项嘉义吴向青
Owner NORTHWESTERN POLYTECHNICAL UNIV
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