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TiAl-based alloy high-temperature oxidation resistant coating and method for implementing same

An anti-oxidation, alloy-based technology, which is applied in the field of high-temperature anti-oxidation coatings for TiAl-based alloys, can solve problems such as uneven deformation of TiAl-based alloys, decreased oxidation resistance of alloys, and difficulty in separating the sheath from the alloy. Deformability, good bonding performance, and low cost of process implementation

Inactive Publication Date: 2009-09-02
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] TiAl-based alloy has high specific strength, specific stiffness and low density, as well as good high-temperature oxidation resistance and creep resistance. It is a very potential light-weight high-temperature structural material. However, the oxidation resistance of alloys above 850 °C decreases significantly, while the thermal processing and heat treatment of TiAl-based alloys are between 900 and 1300 °C. Therefore, preventing the oxidation behavior of TiAl-based alloys during high-temperature treatment is important. The development and application of alloys are of great significance
At present, many scholars at home and abroad have studied the anti-oxidation method of TiAl-based alloys during high-temperature deformation and heat treatment, mainly through the use of special sheaths. High, and in the process of processing, due to the inconsistency between the deformation of the sheath and the deformation of the TiAl-based alloy, the deformation of the TiAl-based alloy is uneven and prone to crack defects. At the same time, it is difficult to separate the sheath from the alloy after deformation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] SiO 2 80%, Na 2 O19%, CaO 1% (mass percentage) mixed evenly, and fired at 1400°C for 2h to form glass. At 1200°C, apply the glass on the surface of a TiAl-based alloy with a side length of 10 mm, keep the bulk TiAl-based alloy protected by glass at 1200°C for 30 minutes, air cool to room temperature, remove the glass coating, and finish the surface of the TiAl-based alloy. , not oxidized.

Embodiment 2

[0023] SiO 2 80%, Na 2 O1%, CaO 19% (mass percentage) mixed evenly, and fired at 1400°C for 2h to form glass. At 1200°C, apply the glass on the surface of a TiAl-based alloy with a side length of 10 mm. Keep the bulk TiAl-based alloy protected by glass at 1250°C for 30 minutes. Air-cool to room temperature, remove the glass coating, and finish the surface of the TiAl-based alloy. , not oxidized.

Embodiment 3

[0025] SiO 2 65%, Na 2 O 15%, CaO 20% (mass percentage) mixed evenly, and fired at 1400°C for 1.5h to form glass. Soak a 30mm×25mm×8mm cuboid TiAl-based alloy in viscous fluid glass at 1200°C, keep it warm for 30 minutes, and then roll it. The deformation in one rolling pass is 8%, and then air-cool to room temperature. The surface of the TiAl-based alloy is not Significant oxidation occurs.

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PUM

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Abstract

The invention discloses a TiAl-based alloy high-temperature oxidation resistant coating, which comprises the following components: SiO2, Na2O and CaO. The method for implementing the TiAl-based alloy high-temperature oxidation resistant coating comprises the following steps of: firstly, taking the components of the TiAl-based alloy high-temperature oxidation resistant coating according to a proportion; heating the components to about 1,500 DEG C, keeping the temperature, and allowing the components to cool to obtain a raw material of the oxidation resistant coating; heating the raw material of the oxidation resistant coating till the raw material of the oxidation resistant coating is in a viscous state; and coating the raw material in the viscous state on the surface of TiAl-based alloy or completely immersing the TiAl-based alloy in the raw material in the viscous state to apply oxidation resistant protection to the TiAl-based alloy during processing at a high temperatue of 1,300 DEG C. The coating is reasonable in component mixing ratio, simple in production process, convenient in operation and use and low in cost, effectively prevents the oxidization of TiAl-based alloy, avoids influencing the high-temperature deformation capacity of the TiAl-based alloy, separates conveniently from a substrate at normal temperature, effectively overcomes the drawbacks of uneven deformation of easy cracking of the TiAl-based alloy, and difficult separation of a covering sleeve and the alloy in the prior art, is applicable to industrial application, and can replace the prior TiAl-based alloy high-temperature oxidation resistant process.

Description

technical field [0001] The invention discloses a TiAl-based alloy high-temperature anti-oxidation coating and a method thereof. Background technique [0002] TiAl-based alloy has high specific strength, specific stiffness and low density, as well as good high-temperature oxidation resistance and creep resistance. It is a very potential light-weight high-temperature structural material. However, the oxidation resistance of alloys above 850 °C decreases significantly, while the thermal processing and heat treatment of TiAl-based alloys are between 900 and 1300 °C. Therefore, preventing the oxidation behavior of TiAl-based alloys during high-temperature treatment is important. The development and application of alloys are of great significance. At present, many scholars at home and abroad have studied the anti-oxidation method of TiAl-based alloys during high-temperature deformation and heat treatment, mainly through the use of special sheaths. High, and during the processing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C8/02C23D5/00
Inventor 李慧中李洲刘咏黄伯云张伟
Owner CENT SOUTH UNIV
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