High-temperature solid lubricating coating for foil air bearing and preparation method thereof

A high-temperature solid, lubricating coating technology, used in bearings, coatings, shafts and bearings, etc., can solve problems such as foil wear, and achieve the effect of improving friction and wear performance and reducing wear

Inactive Publication Date: 2012-07-25
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a high-temperature solid lubricating coating for foil air bearings and its preparation method to solve the problem of foil wear in foil air bearings from room temperature to 650°C

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0015] The preparation process of the high-temperature solid lubricating coating of the present invention is as follows:

[0016] Step 1: Melting the CuAl alloy ingot.

[0017] Step 2: Analyzing the chemical composition of the CuAl alloy by using a chemical analysis method.

[0018] Step 3: Processing CuAl alloy target material for vacuum arc ion plating.

[0019] Step 4: Prepare a CuAl thin film by using a multifunctional composite coating machine.

[0020] Step 5: Using a metallographic microscope to measure the thickness of the CuAl thin film prepared in Step 4.

[0021] Step 6: Test the bonding strength of the CuAl thin film prepared in Step 4 by using a tensile testing machine.

[0022] Step 7: Using a roughness tester to measure the roughness of the CuAl thin film obtained in Step 4.

[0023] Step 8: Use a high-temperature pin-on-disc friction and wear testing machine to test the friction and wear properties of the high-temperature solid lubricating coating prepared ...

Embodiment 1

[0026] In this embodiment, the preparation process of the high-temperature solid lubricating coating is as follows:

[0027] Step 1: Melting the CuAl alloy ingot.

[0028] Step 2: The chemical composition of the CuAl alloy was analyzed by chemical analysis method, and the analysis results are shown in Table 3.

[0029] Table 3 Analysis results of chemical composition of CuAl alloy

[0030] the element

Cu

Al

Content (wt%)

94.5

5.5

[0031] Step 3: Processing CuAl alloy target material for vacuum arc ion plating.

[0032] Step 4: Prepare a CuAl thin film by using a multifunctional composite coating machine. The preparation process is shown in Table 4.

[0033] Table 4 CuAl coating preparation process

[0034]

Process parameters

Bias

/ V

arc voltage

/ V

arc current

/ A

pilot voltage

/ V

pilot current

/ A

focus voltage

/ V

focus current

...

Embodiment 2

[0042] In this embodiment, the preparation process of the high-temperature solid lubricating coating is as follows:

[0043] Step 1: Melting the CuAl alloy ingot.

[0044] Step 2: Analyzing the chemical composition of the CuAl alloy by using a chemical analysis method. The analysis results are shown in Table 6.

[0045] Table 6CuAl alloy chemical composition analysis results

[0046] the element

Cu

Al

Content (wt%)

93.7

6.3

[0047] Step 3: Processing CuAl alloy target material for vacuum arc ion plating.

[0048] Step 4: Prepare a CuAl film by using a multifunctional composite coating machine, and the preparation process is shown in Table 7.

[0049] Table 7 CuAl coating preparation process

[0050]

Process parameters

Bias

/ V

arc voltage

/ V

arc current

/ A

pilot voltage

/ V

pilot current

/ A

focus voltage

/ V

focus current

...

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Abstract

The invention relates to the field of high-temperature solid lubricating coatings, in particular to the high-temperature solid lubricating coating for a foil air bearing and a preparation method thereof, which solve the problem of abrasion of a foil in the foil air bearing at room temperature to 650 DEG C. The coating adopts a CuAl alloy, and comprises the following chemical components in percentage by weight: 80 to 98 percent of Cu and 2 to 10 percent of Al. The coating is prepared by vacuum arc ion plating technology, and process parameters comprise the arc voltage of 20 to 30V, the arc current of 75 to 95A, the guiding voltage of 12 to 18V, the guiding current of 4 to 7A, the focusing voltage of 9 to 13V and the focusing current of 4 to 8A. The preparation method comprises the following steps of: first performing vacuum arc ion plating under the bias voltage of 500 to 600V for 1.5 to 3.5min; then performing the vacuum arc ion plating under the bias voltage of 200 to 300V for 3 to 4h; and finally obtaining the high-temperature solid lubricating coating. The high-temperature solid lubricating coating provided by the invention can improve the friction and abrasion resistance of a high-temperature solid self-lubricating coating for a shaft and avoid or reduce the abrasion of the foil, thereby ensuring the stable running of the foil air bearing in a high-temperature and high-speed environment.

Description

technical field [0001] The invention relates to the field of high-temperature solid lubricating coatings, in particular to a high-temperature solid lubricating coating for foil air bearings and a preparation method thereof. Background technique [0002] Foil air bearings use elastic foil as the supporting element and the surrounding air as the lubricant. It has strong adaptability and high stability, and it is not limited by temperature and speed during operation. It can be applied to high temperature (650°C ) in high-speed (100,000r / min) turbomachinery. However, due to the low speed during the start and stop stages, there is not enough working air film between the foil and the shaft, and a sliding contact occurs between the two, causing severe wear of the foil and the shaft. At present, in order to avoid or reduce the wear of the foil and the shaft, a high-temperature solid self-lubricating coating is used on the shaft, which requires selecting a coating to form a friction...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C30/00C23C14/16C23C14/32F16C32/06
Inventor 徐娜宫骏常新春侯万良张甲张凤军王建强孙超全明秀
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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