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TiAl coating capable of achieving heat growth of aluminum oxide film and preparing method of TiAl coating

A technology of aluminum oxide film and coating, which is applied in the field of TiAl coating of thermally grown aluminum oxide film and its preparation, can solve the problems of poor high-temperature oxidation resistance, interdiffusion, and mismatching of brittle substrates, and achieve low cost, The process is simple and controllable

Active Publication Date: 2016-08-31
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to solve the current poor high temperature oxidation resistance of titanium aluminum intermetallic compounds and titanium alloys, but the existing high temperature protective coatings have serious interdiffusion, brittleness and other problems that do not match the substrate, and it is difficult to meet the high temperature oxidation resistance of such alloys. Performance requirements, while a TiAl coating that is well matched with the base alloy cannot form a selective aluminum oxide film, resulting in poor oxidation resistance, and provides a TiAl coating that can thermally grow an aluminum oxide film and its preparation method

Method used

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  • TiAl coating capable of achieving heat growth of aluminum oxide film and preparing method of TiAl coating
  • TiAl coating capable of achieving heat growth of aluminum oxide film and preparing method of TiAl coating
  • TiAl coating capable of achieving heat growth of aluminum oxide film and preparing method of TiAl coating

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Embodiment 1

[0020] In this embodiment, TiAl is used as a target material to describe the preparation of a trace nitrogen-doped TiAl coating by an arc ion plating process and its preparation method. First, install the TiAl target on the cathode water-cooled target sleeve, hang the titanium alloy substrate (TC4) test piece in front of the target, close the vacuum chamber door, and perform air extraction; the vacuum degree of the coating chamber reaches 5×10 -3 When Pa or higher, ignite the cathodic arc; first, apply pulse high negative bias voltage to the substrate for ion bombardment cleaning, after cleaning, pass nitrogen gas to make the vacuum degree of the vacuum chamber reach 0.6×10 -2 Pa. The arc current is 50-400A. The current size can affect the coating deposition rate. The deposition rate is roughly linear with the current size. In this example, 70A is used, and the pulse bias is -50V. The pulsed negative bias applied to the substrate has a frequency of 40 kHz and a duty cycle of ...

Embodiment 2

[0022]In this embodiment, TiAl is used as a target material to describe the preparation of a trace nitrogen-doped TiAl coating by an arc ion plating process and its preparation method. First, install the TiAl target on the cathode water-cooled target sleeve, hang the titanium alloy substrate (TC4) test piece in front of the target, close the vacuum chamber door, and perform air extraction; the vacuum degree of the coating chamber reaches 5×10 -3 When Pa or higher, the cathodic arc is ignited; firstly, a pulsed high negative bias is applied to the substrate for ion bombardment cleaning. After cleaning, nitrogen gas is passed through to make the vacuum degree of the vacuum chamber reach 6×10 -2 Pa. The arc current was 70A, and the pulse bias was -50V. The pulsed negative bias applied to the substrate has a frequency of 40 kHz and a duty cycle of 20%. The coating time depends on the thickness of the required coating. In this example, the arc source is turned off after 2 hours f...

Embodiment 3

[0024] In this embodiment, TiAl is used as a target material to illustrate the preparation of a trace carbon-doped TiAl coating by an arc ion plating process and its preparation method. Using the same preparation process as in Example 1, the carbon-doped TiAl coating can be obtained by substituting methane for nitrogen. First, install the TiAl target on the cathode water-cooled target sleeve, hang the titanium alloy substrate (TC4) test piece in front of the target, close the vacuum chamber door, and perform air extraction; the vacuum degree of the coating chamber reaches 5×10 -3 When Pa or higher, the cathodic arc is ignited; firstly, a pulsed high negative bias is applied to the substrate for ion bombardment cleaning. After cleaning, methane is passed through to make the vacuum degree of the vacuum chamber reach 6×10 -2 Pa. The arc current was 70A, and the pulse bias was -50V. The pulsed negative bias applied to the substrate has a frequency of 40 kHz and a duty cycle of 2...

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Abstract

The invention provides a TiAl coating capable of achieving heat growth of an aluminum oxide film and a preparing method of the TiAl coating, and belongs to the technical field of coatings. The TiAl coating can be used for high-temperature oxidation protection of a titanium alloy, a titanium aluminum intermetallic compound and other materials. According to the TiAl coating with the selective aluminum oxide film forming capability, the Al atom ratio content of a TiAl alloy target material ranges from 38%-58%. TiAl serves as a target material, in the physical vapor deposition process, a trace of carbon or nitrogen is doped, the TiAl coating with the selective aluminum oxide film forming capability is obtained, a new thought and method are provided for designing a titanium alloy and titanium aluminum intermetallic compound anti-oxidation protection coating, the chemical compatibility between the coating and a base body is good, and brittleness is low. Meanwhile, the technology is simple, controllable, environment-friendly, low in cost and suitable for industrial application. Compared with existing related protection coatings, obvious technical advantages are achieved.

Description

technical field [0001] The invention relates to coating technology, and in particular provides a TiAl coating capable of thermally growing an aluminum oxide film and a preparation method thereof. Background technique [0002] Titanium alloys and titanium-aluminum intermetallic compounds have low density, high specific strength, excellent corrosion resistance, and certain high-temperature strength, and are widely used in aerospace, shipbuilding, power and other fields. Especially for aero-engines, the use of titanium alloy and titanium-aluminum intermetallic compound compressor blades can greatly reduce the weight of the engine and increase the thrust-to-weight ratio. However, due to the high oxophilic activity of titanium, even titanium-aluminum intermetallic compounds cannot form a protective aluminum oxide film at high temperatures (>500°C). Therefore, improving the oxidation resistance of titanium alloys and titanium-aluminum intermetallic compounds requires Obtained ...

Claims

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Application Information

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IPC IPC(8): C23C14/16C23C14/32C23C14/35C23C14/30C23C14/02
CPCC23C14/022C23C14/16C23C14/165C23C14/30C23C14/325C23C14/35
Inventor 沈明礼朱圣龙
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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