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High-performance high temperature solid self-lubricating coating and preparation method thereof

A self-lubricating coating, high-temperature solid technology, used in coatings, metal material coating processes, melt spraying and other directions, can solve problems such as parts wear, reduce friction and wear, and promote development.

Inactive Publication Date: 2011-05-04
INST OF METAL RESEARCH - CHINESE ACAD OF SCI +1
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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 self-lubricating powder, a coating and a preparation method thereof to solve the problem of zero-zero in operating machinery (such as foil air bearings) at low temperature (-55°C) to high temperature (800°C). wear and tear of components

Method used

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  • High-performance high temperature solid self-lubricating coating and preparation method thereof
  • High-performance high temperature solid self-lubricating coating and preparation method thereof

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preparation example Construction

[0032] The preparation method of the high-performance high-temperature solid self-lubricating coating of the present invention, the specific steps are as follows:

[0033] Step 1: According to the proposed BaF 2 / CaF 2 The ingredients are batched and mixed uniformly, and NiCr alloy ingots are vacuum induction melted.

[0034] Step 2: Preparation of eutectic BaF by ultrasonic gas atomization 2 / CaF 2 powder, NiCr powder, Ag powder.

[0035] Step 3: The BaF prepared in step 2 is analyzed by scanning electron microscope 2 / CaF 2 The powder was observed for its morphology.

[0036] Step 4: According to the mass fraction and particle size of each component in the proposed composite powder, NiCr, Cr 2 o 3 , Ag and eutectic BaF 2 / CaF 2 The powder is mechanically mixed for 6-15 hours to obtain a high-temperature solid self-lubricating composite powder.

[0037] Step 5: Using a scanning electron microscope with an energy spectrum analyzer to observe the structure and compos...

Embodiment 1

[0045] The preparation method of the high-performance high-temperature solid self-lubricating coating in this embodiment, the specific steps are as follows:

[0046] Step 1: Press BaF 2 / CaF 2 Composition 68% BaF 2 , 32%CaF 2 Batching and mixing uniformly; vacuum induction melting NiCr alloy ingot, wherein Ni accounts for 80%, and the rest is Cr (mass fraction).

[0047] Step 2: Preparation of eutectic BaF by ultrasonic gas atomization 2 / CaF 2 powder, NiCr powder, Ag powder. Eutectic BaF 2 / CaF 2 The atomization process parameters are: atomization pressure 5MPa, atomization temperature 1350°C, vacuum degree 5Pa, melt flow rate 3kg / min. The atomization process parameters of NiCr powder are: atomization pressure 5MPa, atomization temperature 1510°C, vacuum degree 10Pa, melt flow rate 5kg / min. The atomization process parameters of the Ag powder are atomization pressure 4MPa, atomization temperature 1120°C, vacuum degree 8Pa, and melt flow rate 5kg / min.

[0048] Step 3:...

Embodiment 2

[0064] The preparation method of the high-performance high-temperature solid self-lubricating coating in this embodiment, the specific steps are as follows:

[0065] Step 1: Press BaF 2 / CaF 2 Composition 62% BaF 2 , 38%CaF 2 Batching and mixing uniformly; vacuum induction melting NiCr alloy ingot, wherein Ni accounts for 75% (mass fraction), and the rest is Cr.

[0066] Step 2: Preparation of eutectic BaF by ultrasonic gas atomization 2 / CaF 2 powder, NiCr powder, Ag powder. Eutectic BaF 2 / CaF 2 The atomization process parameters are: atomization pressure 10MPa, atomization temperature 1400°C, vacuum degree 5Pa, melt flow rate 4kg / min. The atomization process parameters of NiCr powder are: atomization pressure 7MPa, atomization temperature 1550°C, vacuum degree 8Pa, melt flow rate 6kg / min. The atomization process parameters of the Ag powder are atomization pressure 5MPa, atomization temperature 1150°C, vacuum degree 7Pa, and melt flow rate 4kg / min.

[0067] Step 3:...

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Abstract

The invention relates to the field of solid lubricating, in particular to a high-performance high temperature solid self-lubricating coating and a preparation method thereof, aiming at solving the problem that parts of a machine (such as a foil air bearing) are worn when in operation from low temperature (minus 55 DEG C) to high temperature (800 DEG C). The high temperature solid self-lubricating composite coating adopts a composite powder composed of NiCr, Cr2O3, Ag and eutectic BaF2 / CaF2, wherein NiCr is an adhesive, Cr2O3 is a wear-resistant phase, Ag is a low temperature lubricating agent, and the eutectic BaF2 / CaF2 is a high temperature lubricating agent. The NiCr powder, Ag powder and the eutectic BaF2 / CaF2 powder are all prepared by adopting the ultrasonic gas atomization technology, and the composite powder is prepared by adopting a mechanical mixing method. The high temperature solid self-lubricating coating is prepared by adopting the atmosphere plasma spraying technology. The high temperature solid self-lubricating coating in the invention can avoid or reduce wear of the parts of the machine running at high speed and high temperature (such as wear of a foil and a shaft of the foil air bearing), thus expanding working temperature and speed of the machine in operation and having important industrial application value.

Description

technical field [0001] The invention relates to the field of solid lubrication, in particular to a high-performance high-temperature solid self-lubricating coating and a preparation method thereof. Background technique [0002] Foil air bearing (FAB) is the core structure of the current advanced oil-free turbine technology. It uses the surrounding air as a lubricant during normal operation. Compared with the static pressure gas bearing, it does not require an additional air supply system, making the system Simplified; compared with the traditional oil lubrication system, the oil lubrication system is removed, the weight of the machine is greatly reduced, and it also has the advantages of reducing friction power consumption, no pollution to the working medium and the environment, and at the same time breaking the limitation of working temperature and speed , so that the performance can be greatly improved. NASA (NASA) believes that "the use of this technology can reduce the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/04C23C4/12C23C4/134
Inventor 常新春徐娜孟涛谢海波袁宁高中亚王崇俊侯万良张甲张春智王建强
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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