Nickel-base aluminum oxide high-temperature self-lubricating wear-resistant coating and preparation method thereof

A high-temperature self-lubricating, wear-resistant coating technology, applied in the field of wear-resistant coatings, can solve problems such as poor high-temperature lubrication performance

Active Publication Date: 2019-06-11
TANGSHAN COLLEGE
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The research group used atmospheric plasma spraying and supersonic flame spraying technology to prepare NiCoCrAlY/Al 2 o 3 -B 4 C coating material, the research finds that the coating has good high temperature oxidation resistance, but its high temperature lubricity is poor, in order to further improv

Method used

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  • Nickel-base aluminum oxide high-temperature self-lubricating wear-resistant coating and preparation method thereof
  • Nickel-base aluminum oxide high-temperature self-lubricating wear-resistant coating and preparation method thereof
  • Nickel-base aluminum oxide high-temperature self-lubricating wear-resistant coating and preparation method thereof

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Experimental program
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preparation example Construction

[0022] 1. Preparation of powder

[0023](1) Weigh Al respectively according to the stoichiometric ratio 2 o 3 and CaF 2 .BaF 2 Put the powder into a plastic bucket, add a certain proportion of deionized water, mix it evenly with a JJ-1 booster electric mixer, add an appropriate amount of defoamer to remove the air bubbles in the mixed slurry, and spray it through LGZ high-speed centrifugal spray The granulation dryer performs centrifugal spray granulation on the mixed slurry to obtain spherical Al 2 o 3 -CaF 2 .BaF 2 Composite powder.

[0024] The weight composition of each component is: Ni: Co: Cr: Al: Y = 74: 2.5: 17.5: 5.5: 0.5; NiCoCrAlY: 40% ~ 50%; Al 2 o 3 : 40%~50%; CaF 2 .BaF 2 : 5% to 15%. where CaF 2 .BaF 2 for CaF 2 and BaF 2 The mixed powder, the molar ratio between the two is 1:1.

[0025] (2) Sieve the prepared composite powder, and take particles between 20-45 μm for subsequent preparation of supersonic composite powder.

[0026] (3) First, tak...

Embodiment 1

[0032] NiCoCrAlY / Al 2 o 3 -CaF 2 .BaF 2 Composite coating, its composition is: Ni:Co:Cr:Al:Y=74:2.5:17.5:5.5:0.5; NiCoCrAlY: 50%; Al 2 o 3 : 40%; CaF 2 .BaF 2 : 10%. Al was prepared by spray granulation technique 2 o 3 -CaF 2 .BaF 2 composite powder, and prepared coated NiCoCrAlY / Al by high-pressure hydrogen reduction technology and solid phase alloying technology 2 o 3 -CaF 2 .BaF 2 Composite powder, NiCoCrAlY / Al was prepared by supersonic flame spraying technology 2 o 3 -CaF 2 .BaF 2 Composite coating material, testing its coefficient of friction and wear rate.

[0033] figure 2 Shown is the temperature vs. HVOF NiCoCrAlY / Al 2 o 3 -CaF 2 .BaF 2 Effect of composite coating on coefficient of friction. As shown in the figure, as the temperature increases, the friction coefficient of the coating first increases slightly and then decreases. At 200°C, the friction coefficient is the largest at about 0.81, and at 800°C, the friction coefficient is the small...

Embodiment 2

[0037] NiCoCrAlY / Al 2 o 3 Composite coating, its composition is: Ni:Co:Cr:Al:Y=74:2.5:17.5:5.5:0.5; NiCoCrAlY: 45%; Al 2 o 3 : 50%; CaF 2 .BaF 2 : 5%. Al was prepared by spray granulation technique 2 o 3 powder, and the coated NiCoCrAlY / Al was prepared by high-pressure hydrogen reduction technology and solid phase alloying technology 2 o 3 Composite powder, NiCoCrAlY / Al was prepared by supersonic flame spraying technology 2 o 3 Composite coating material, testing its coefficient of friction and wear rate.

[0038] Conclusion: The lowest wear rate at room temperature is 4.8×10 -4 mm 3 / Nm. At 800°C, the friction coefficient is the lowest, about 0.4.

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Abstract

The invention discloses a nickel-base aluminum oxide high-temperature self-lubricating wear-resistant coating and a preparation method thereof. The supersonic speed flame spraying technology is adopted for preparing the NiCoCrAlY/Al2O3-CaF2.BaF2 high-temperature solid self-lubricating wear-resistant coating material, the structure is more compact, the coating has lower high-temperature friction coefficient, at the temperature of 800 DEG C, the friction coefficient is just 0.27, the reason mainly lies in that CaF2.BaF2 is softened at the high temperature, the softened CaF2.BaF2 generates a lubricating film on the surface of the coating under the effect of shearing stress, and therefore the friction coefficient is reduced.

Description

technical field [0001] The invention generally relates to the field of wear-resistant coatings, in particular to the preparation of nickel-based aluminum oxide high-temperature self-lubricating wear-resistant coatings by means of supersonic flame spraying technology. Background technique [0002] The rust prevention, corrosion resistance, wear resistance and lubrication of superalloys used in aerospace, electric power, nuclear energy and metallurgy fields are key issues to be solved urgently, which directly affect the service life of superalloys. Especially for high-temperature alloy materials used in high-speed wear and thermal corrosion environments, in such harsh environments, lubricating grease is powerless, commonly used solid lubricants such as graphite, MoS 2 It is an effective solution to develop a solid lubricating wear-resistant coating that can be used for a long time in a high temperature and high oxidation environment. [0003] The solid lubricating wear-resist...

Claims

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Application Information

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IPC IPC(8): C23C4/129C23C4/073C23C4/10
Inventor 曹玉霞田会娟郝斌孙景卫
Owner TANGSHAN COLLEGE
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