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Process method for embedding cementation of Al-Si-Y on TiAl on alloy surface

A process method and co-infiltration technology, which is applied in the direction of metal material coating process, coating, solid diffusion coating, etc. The preparation technology and its application are still blank, etc., to achieve the effects of good high temperature oxidation resistance, good coating adhesion, and easy realization.

Inactive Publication Date: 2012-10-31
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the oxidation resistance of titanium-aluminum-based superalloys is poor, and it is difficult to meet the requirements of its use at high temperatures. Therefore, it is necessary to prepare a coating on the surface of the alloy to improve its oxidation resistance.
[0003] In recent years, there have been few studies on high-temperature oxidation-resistant coatings on the surface of titanium-aluminum alloys, and they mainly focus on plasma spraying and ion infiltration. (2) The chemical activity of titanium element is high, and conventional embedding infiltration catalysts (such as NH 4 Cl, NaF) is difficult to achieve a good quality infiltration layer
Some researchers use the embedding method to prepare SI-Al infiltrated layer on the surface of TiAl, but vacuum furnace and argon protection are required, the process is complicated, and there are no stable and reliable processes and application examples.
[0004] At present, the preparation technology and application of Al-Si-Y infiltrated layer on the surface of titanium-aluminum alloy that resist high temperature oxidation are still blank

Method used

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  • Process method for embedding cementation of Al-Si-Y on TiAl on alloy surface
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  • Process method for embedding cementation of Al-Si-Y on TiAl on alloy surface

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Experimental program
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Effect test

Embodiment 1

[0037] ① Prepare the sample: the sample is polished by 400# sandpaper, ultrasonically cleaned, and dried; ② Prepare the penetrating agent: accurately weigh the penetrating agent according to the amount, and the proportion of the penetrating agent is: 5% silicon (≤100 mesh) , 10% aluminum (≤100 mesh), 1% hexahydrate and aluminum chloride are analytically pure, 5% diyttrium trioxide (≤100 mesh), and the rest is aluminum oxide (≤200 mesh); The prepared penetrating agent was ground in a ball mill to make it fully mixed; ④Drying: Put the milled penetrating agent in an oven at 100°C for 1 hour to keep warm for drying; Put the sample into the crucible, and embed the sample in the infiltration agent. The distance between adjacent parallel samples is not less than 8mm. ⑥Seal: Cover the crucible with the sample and seal it with silica sol and aluminum oxide. Place in a high-temperature resistance furnace; ⑦Embedding infiltration: heat up to 1050°C for 1h, keep warm at 1050°C for 3h, and...

Embodiment 2

[0039] ① Prepare the sample: the sample is polished by 400# sandpaper, ultrasonically cleaned, and dried; ② Prepare the penetrating agent: accurately weigh the penetrating agent according to the amount, and the proportion of the penetrating agent is: 10% silicon (≤100 mesh) , 2% aluminum (≤100 mesh), 10% hexahydrate and aluminum chloride are analytically pure, 0.5% diyttrium trioxide (≤100 mesh), and the rest is aluminum oxide (≤200 mesh); The prepared penetrating agent was ground in a ball mill to make it fully mixed; ④Drying: Put the milled penetrating agent in an oven at 100°C for 1 hour to keep warm for drying; Put the sample into the crucible, and embed the sample in the infiltration agent. The distance between adjacent parallel samples is not less than 8mm. ⑥Seal: Cover the crucible with the sample and seal it with silica sol and aluminum oxide. Place in a high-temperature resistance furnace; ⑦Embedding: heat up to 1050°C for 1 hour, keep warm at 1050°C for 1 hour, and t...

Embodiment 3

[0041] ① Prepare the sample: the sample is polished by 400# sandpaper, ultrasonically cleaned, and dried; ② Prepare the penetrating agent: accurately weigh the penetrating agent according to the amount, and the proportion of the penetrating agent is: 8% silicon (≤100 mesh) , 5% aluminum (≤100 mesh), 5% hexahydrate and aluminum chloride are analytically pure, 3% diyttrium trioxide (≤100 mesh), and the rest is aluminum oxide (≤200 mesh); The prepared penetrating agent was ground in a ball mill to make it fully mixed; ④Drying: Put the milled penetrating agent in an oven at 100°C for 1 hour to keep warm for drying; Put the sample into the crucible, and embed the sample in the infiltrant. The distance between adjacent parallel samples is not less than 8mm. ⑥Seal: Cover the crucible with the sample and seal it with silica sol and aluminum oxide. Place in a high-temperature resistance furnace; ⑦Embedding infiltration: heat up to 1050°C for 1h, keep warm at 1050°C for 2h, then air coo...

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Abstract

The invention discloses a process method for embedding cementation of Al-Si-Y on a TiAl alloy surface. Firstly, a sample is cleaned and blow-dried after being ground; a prepared diffusion agent is placed in a ball mill, completely mixed and dried; the sample is embedded in the diffusion agent, sealed by silica sol and aluminum oxide, placed in a high-temperature resistance furnace for heating and subjected to air cooling to a room temperature after the temperature is preserved; and the embedded diffused sample is cleaned and dried and the process is completed. A vacuum furnace is not required, argon is not be required to be filled in for protection, then an infiltrated layer which is good in bonding force, uniform and compact is obtained, the high-temperature oxidation resistant performance of TiAl alloys is improved, the process is simple, the operation is simple, the cost is low, the implementation is easy, the efficiency is high and the method is suitable to production and application.

Description

technical field [0001] The invention relates to a method for preparing a TiAl alloy surface infiltrated layer, which is specially used for the production and application of the TiAl alloy surface Al-Si-Y modified titanium compound infiltrated layer, and belongs to the technical field of metal material surface modification. Background technique [0002] The new multi-component titanium-aluminum-based superalloy based on Ti / Al has the characteristics of high specific strength, specific stiffness, and high creep resistance. It is one of the strong competitors for high-temperature structural materials for high-performance gas turbine engines in the future. However, the oxidation resistance of titanium-aluminum-based superalloys is poor, and it is difficult to meet the requirements of its use at high temperatures. Therefore, it is necessary to prepare a coating on the surface of the alloy to improve its oxidation resistance. [0003] In recent years, there have been few studies o...

Claims

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Application Information

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IPC IPC(8): C23C10/52
Inventor 谢发勤李涌泉吴向清
Owner NORTHWESTERN POLYTECHNICAL UNIV
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