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Self-lubricating coating for wide temperature range, workpiece and preparation method of self-lubricating coating

A technology of self-lubricating coating and wide temperature range, applied in metal material coating process, coating, fusion spraying, etc., can solve problems such as component failure, coating and counterpart wear, and achieve high coating bonding strength , dense microstructure, good self-lubricating effect and wear resistance

Inactive Publication Date: 2020-04-24
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

NiCr / Cr 3 C 2 -BaF 2 ·CaF 2 The poor tribological behavior of the coating at room temperature to moderate temperature often leads to excessive wear of the coating and the counterpart, and premature failure of the component

Method used

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  • Self-lubricating coating for wide temperature range, workpiece and preparation method of self-lubricating coating
  • Self-lubricating coating for wide temperature range, workpiece and preparation method of self-lubricating coating
  • Self-lubricating coating for wide temperature range, workpiece and preparation method of self-lubricating coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] This embodiment provides a method for preparing a self-lubricating coating for a wide temperature range. In this embodiment, the base material to be sprayed is selected from GH4169 superalloy, put the treated base material into acetone, and clean it with an ultrasonic instrument to remove oil stains; within 2 hours before spraying, use 46#Al 2 o 3 Corundum sand is used to roughen the surface of the substrate by sandblasting, and the blasting pressure is 0.3MPa to improve the bonding strength between the coating and the substrate.

[0043] NiCr / Cr 3 C 2 -BaF 2 .CaF 2 The powder is prepared by spray granulation, and the powder contains the following raw materials in weight percentage: Cr 3 C 2 66.77%, NiCr 28.23%, BaF 2 ·CaF 2 5%. That is, Ni content is 22.5%, C is 8.91%, Ba is 2.43%, Ca is 0.97%, F is 1.59%, and Cr is the balance.

[0044] The silver powder is prepared by an atomization method, and the purity of the silver powder in this embodiment is 99.99%, a...

Embodiment 2

[0056] This embodiment provides a method for preparing a self-lubricating coating for a wide temperature range. In this embodiment, the base material to be sprayed is selected from GH4169 superalloy, put the treated base material into acetone, and clean it with an ultrasonic instrument to remove oil stains; within 2 hours before spraying, use 46#Al 2 o 3 Corundum sand is used to roughen the surface of the substrate by sandblasting, and the blasting pressure is 0.3MPa to improve the bonding strength between the coating and the substrate.

[0057] NiCr / Cr 3 C 2 -BaF 2 .CaF 2 The powder is prepared by spray granulation, and the powder contains the following raw materials in weight percentage: Cr 3 C 2 66.77%, NiCr 28.23%, BaF 2 ·CaF 2 It accounts for 5%, that is, Ni content is 22.5%, C is 8.91%, Ba is 2.43%, Ca is 0.97%, F is 1.59%, and Cr is the balance.

[0058] The silver powder is prepared by an atomization method, and the purity of the silver powder in this embodime...

Embodiment 3

[0069] This embodiment provides a method for preparing a self-lubricating coating for a wide temperature range. In this embodiment, the base material to be sprayed is selected from GH4169 superalloy, put the treated base material into acetone, and clean it with an ultrasonic instrument to remove oil stains; within 2 hours before spraying, use 46#Al 2 o 3 Corundum sand is used to roughen the surface of the substrate by sandblasting, and the blasting pressure is 0.3MPa to improve the bonding strength between the coating and the substrate.

[0070] NiCr / Cr 3 C 2 -BaF 2 .CaF 2 The powder is prepared by spray granulation, and the powder contains the following raw materials in weight percentage: Cr 3 C 2 66.77%, NiCr 28.23%, BaF 2 ·CaF 2 5%. That is, Ni content is 22.5%, C is 8.91%, Ba is 2.43%, Ca is 0.97%, F is 1.59%, and Cr is the balance.

[0071] The silver powder is prepared by an atomization method, and the purity of the silver powder in this embodiment is 99.99%, a...

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Abstract

The invention discloses a self-lubricating coating for a wide temperature range, a workpiece and a preparation method of the self-lubricating coating, and relates to the technical field of material surface treatment. Mixed powder of NiCr / Cr3C2-BaF2.CaF2 powder and Ag powder is sprayed onto a base material by adopting a hypersonic flame spraying method so as to form the self-lubricating coating forthe wide temperature range. According to the method, the original shapes and sizes of the NiCr / Cr3C2-BaF2.CaF2 powder and the silver powder are well reserved, and the prepared composite spraying powder is good in fluidity. The composite coating prepared by the preparation method is compact in microstructure and high in bonding strength, can keep good self-lubricating effect and wear resistance ina temperature range from room temperature to 800 DEG C, and realizes work in the wide temperature range.

Description

technical field [0001] The invention relates to the technical field of material surface treatment, in particular to a self-lubricating coating for a wide temperature range, a workpiece and a preparation method thereof. Background technique [0002] The sealing device of an aero-engine can significantly reduce the weight and fuel consumption rate of the engine, improve the efficiency of hot-end components, improve the life of thrust bearings, and slow down the decline of engine sealing performance. At present, the long-life and high-efficiency sealing device has attracted extensive attention of the aviation industry and has become one of the focal issues in this research field. The coated sealing runway is a key component of the sealing device, and its accuracy, safety, reliability and service life from normal temperature to high temperature operation are the key to design and manufacture. [0003] At present, in order to improve the wear resistance and friction reduction ef...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/129C23C4/06
CPCC23C4/129C23C4/06
Inventor 张吉阜苏威铭邓春明宋进兵刘敏周克崧
Owner GUANGDONG INST OF NEW MATERIALS