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Titanium alloy protecting coating and preparation method thereof

A technology of protective coating and titanium alloy, applied in metal material coating process, coating, ion implantation plating and other directions, can solve the problems of passivation film damage, limited titanium alloy application, weak coating bearing capacity and other problems

Active Publication Date: 2019-03-19
BEIJING GOLDEN WHEEL SPECIAL MACHINE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the low surface hardness of titanium alloys, it is often manifested as an unstable friction coefficient under sliding friction conditions and the destruction of the passivation film caused by friction, resulting in high wear, which limits its application in the field of tribology.
[0003] Preparing a protective coating on the surface of titanium alloy is an effective means to solve its limited application in the field of tribology. The unbalanced mechanical properties of the coating and the titanium alloy substrate, excessive stress, and weak coating load-bearing capacity severely limit the application of titanium alloys under heavy load conditions.

Method used

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  • Titanium alloy protecting coating and preparation method thereof
  • Titanium alloy protecting coating and preparation method thereof

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preparation example Construction

[0029] The present invention also provides a method for preparing the titanium alloy protective coating described in the above technical solution, comprising the following steps:

[0030] (1) Nitrogen ion implantation is performed on the surface of the titanium alloy substrate to obtain a metallurgical mixed interface layer;

[0031] (2) On the surface of the metallurgical mixed interface layer, a CrN layer, a CrCN layer and a Cr-doped DLC layer are sequentially deposited by a plasma-enhanced physical vapor deposition method.

[0032] In the present invention, the titanium alloy substrate is preferably pretreated.

[0033] In the present invention, the pretreatment preferably includes cleaning and drying; the method of the cleaning and drying is not particularly limited in the present invention, as long as a clean and dry titanium alloy substrate can be obtained.

[0034] In the embodiment of the present invention, the cleaning is preferably ultrasonic cleaning; the ultrasoni...

Embodiment 1

[0047] 1. Clean the inner ring of the titanium alloy joint bearing with an industrial-specific seven-slot ultrasonic wave for 15 minutes. After cleaning, blow it dry and keep it dry in a vacuum oven for 15 minutes;

[0048] 2. Install the cleaned inner ring of the joint bearing on the fixture rod, put it on the rotating frame of the vacuum chamber, and then when the vacuum degree of the vacuum chamber reaches 5×10 -3 After Pa, turn on the radio frequency power supply for nitrogen ion implantation. The nitrogen ion implantation process is as follows: the flow rate of nitrogen gas gradually increases from 120 sccm to 150 sccm, the pressure of nitrogen gas gradually increases from 0.6 Pa to 0.8 Pa, the radio frequency power is 0.5 kW, and the injection voltage 20kV, injection frequency 100Hz, injection pulse width 20μs, injection time 8h; after the injection is completed, a metallurgical mixed interface layer is obtained;

[0049] 3. Clean the surface of the metallurgical mixed i...

Embodiment 2

[0056] 1. Process the titanium alloy key bearing inner ring according to the method described in step 1 of embodiment 1;

[0057] 2. Install the cleaned inner ring of the joint bearing on the fixture rod, put it on the rotating frame of the vacuum chamber, and then when the vacuum degree of the vacuum chamber reaches 5×10 -3 After Pa, turn on the radio frequency power supply for nitrogen ion implantation. The nitrogen ion implantation process is as follows: the flow rate of nitrogen gas is gradually increased from 80 sccm to 120 sccm, the pressure of nitrogen gas is gradually increased from 0.4Pa to 0.6Pa, the radio frequency power is 1kW, and the injection voltage is 40kV , the injection frequency is 100Hz, the injection pulse width is 20μs, and the injection time is 4h; after the injection is completed, a metallurgical mixed interface layer is obtained;

[0058] 3. according to the method described in embodiment 1 step 3, carry out glow plasma to the metallurgical mixed inte...

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Abstract

The invention belongs to the technical field of titanium alloy surface coatings and provides a titanium alloy protecting coating. The titanium alloy protecting coating successively comprises a metallurgy-like mixed interface layer, a CrN layer, a CrCN layer and a Cr doped DLC layer from inside to outside. The metallurgy-like mixed interface layer is obtained by injecting nitrogen ions through an ion implantation depositing method. The metallurgy-like mixed interface layer prepared by means of the ion implantation depositing method is increased gradiently from core to surface in hardness. On this basis, the CrN layer, the CrCN layer and the Cr doped DLC layer are successively arranged and the hardness is increased gradually, so that hardness sudden change caused by directly depositing the coating to the titanium alloy surface is avoided. The coating can bear a relatively high pressure. The surface working layer doped with Cr can keep the friction coefficient be smaller than 0.1 during friction. The surface of the titanium alloy protecting coating bearing a pressure of 500 MPa provided by the invention is not damaged, and the friction coefficient is only 0.07 and the wear resistanceis improved by three times.

Description

technical field [0001] The invention relates to the technical field of titanium alloy surface coatings, in particular to a titanium alloy protective coating and a preparation method thereof. Background technique [0002] Titanium alloy has the characteristics of small specific gravity, high strength and good corrosion resistance, and has a broad application space in the aerospace field where the weight of components is important. However, due to the low surface hardness of titanium alloys, it is often manifested in the unstable friction coefficient and the destruction of the passivation film caused by friction under sliding friction conditions, resulting in high wear, which limits its application in the field of tribology. [0003] Preparing a protective coating on the surface of titanium alloy is an effective means to solve its limited application in the field of tribology. The unbalanced mechanical properties of the coating and the titanium alloy substrate, excessive stre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/48C23C14/06
CPCC23C14/0605C23C14/0641C23C14/0664C23C14/48
Inventor 汪瑞军詹华李振东王亦奇徐天杨
Owner BEIJING GOLDEN WHEEL SPECIAL MACHINE
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