Method for enhancing tribology performance of nickel-based coating by utilizing ceramic nanoparticles

A nanoparticle and tribological technology, which is applied in the field of thermal spraying technology and surface engineering, can solve problems such as failure and coating performance degradation, and achieve the effects of improving tribological performance, increasing interface bonding strength, and reducing pores and cracks

Inactive Publication Date: 2020-04-21
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The addition of micron-scale reinforcing phases used in this patent will cause the degradation of coating performance and failure due to grain growth under high temperature conditions.
The above patents improve the tribological properties of the coating by adding reinforcing particles to the NiCrBSi substrate, but only increase the hardness of the coating through the dispersion strengthening of the reinforcing particles to improve wear resistance, and have limited impact on wear resistance

Method used

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  • Method for enhancing tribology performance of nickel-based coating by utilizing ceramic nanoparticles
  • Method for enhancing tribology performance of nickel-based coating by utilizing ceramic nanoparticles
  • Method for enhancing tribology performance of nickel-based coating by utilizing ceramic nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1), the composition (mass percentage) of the mixed powder for spraying is: Ni60 alloy powder: 95%; SiC ceramic nano powder: 5%.

[0028] 2) Due to its large specific surface area and strong surface activity, SiC ceramic nano powder is prone to serious agglomeration. In order to ensure that SiC ceramic nano powder and Ni60 alloy powder are evenly mixed, Ni60 alloy powder is added to absolute ethanol to make a suspension. Then add polyethylene glycol (PEG) as a dispersant, and then add SiC ceramic nano-powder to form a dispersion liquid, and ball mill for 2 hours with the ball-to-material ratio of 10:1 and the ball milling parameters of 200r / min. Dry for 10 hours, and then continue ball milling for 1 hour with the same ball milling parameters.

[0029] 3) Pour the dried mixed powder into the powder feeder, and adjust the powder feeding airflow so that the powder is just sent to the center of the plasma flame. The process parameters of atmospheric plasma spraying are: the...

Embodiment 2

[0035] The difference from Example 1 is that: the mixed powder (mass percentage) for spraying in step 1) is Ni45 alloy powder: 97%; SiC ceramic powder: 3%. In order to ensure that the SiC ceramic powder and the Ni60 alloy powder are evenly mixed, the powder mixing is carried out according to the step 2) in the embodiment 1. In step 6), under dry grinding conditions, the volume wear rate of the sprayed SiC-Ni60 composite coating was 1.422×10 -5 mm 3 / N m, lower than 3.586×10 of pure Ni60 coating -5 mm 3 / N·m. However, under the condition of water lubrication, the volume wear rate of SiC-Ni60 composite coating is 1.153×10 -6 mm 3 / N m, much lower than 6.551×10 of pure Ni60 coating - 6 mm 3 / N·m. Using focused ion beam technology to cut the wear scar surface of the water-milled sample and observe it with a transmission electron microscope, it can be seen that there is a continuous boundary lubricating film on the wear scar surface.

Embodiment 3

[0037] The difference with Example 1 is: the mixed powder for spraying in step 1) is Ni60 alloy powder: 95%; TiO 2 Ceramic powder: 5%. In order to guarantee TiO 2 The ceramic powder and the Ni60 alloy powder are mixed evenly, and the powder is mixed with the step 2) in the embodiment 1. In step 6), under dry grinding conditions, the sprayed TiO 2 -The volume wear rate of the Ni60 composite coating is 2.133×10 -5 mm 3 / N m, lower than 3.586×10 of pure Ni60 coating -5 mm 3 / N·m. However, under the condition of water lubrication, TiO 2 -The volume wear rate of the Ni60 composite coating is 3.106×10 -6 mm 3 / N m, much lower than 6.551×10 of pure Ni60 coating -6 mm 3 / N·m. The focused ion beam technique was used to cut the wear scar surface of the water-milled sample, and the transmission electron microscope observation showed that no continuous boundary lubricant film was observed.

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Abstract

The invention relates to a method for enhancing the tribology performance of a nickel-based coating by utilizing ceramic nanoparticles. The method mainly comprises the following main steps of weighingNi60 alloy and ceramic nanoparticles according to the distribution ratio of the coating, uniformly mixing the Ni60 alloy and the ceramic nanoparticles, and then preparing a high-performance wear-resistant coating on the surface of a metal matrix after sand blasting through an atmospheric plasma spraying technology. Sprayed composite powder contains the ceramic nanoparticles, so that grain nucleation of a NiCrBSi matrix is facilitated, and surface defects such as pores and cracks during coating preparation are reduced. Under the water lubrication condition, the SiC ceramic nanoparticles undergo hydrolyzing to generate a continuous ceramic phase boundary lubricating film on a friction interface under the action of a friction pair, the direct contact between the friction pair and a nickel-based material is effectively avoided, the nickel-based material is protected, and the hardness of the interface is obvious, so that the wear resistance of a SiC-NiCrBSi composite coating can be remarkably improved.

Description

technical field [0001] The invention relates to the fields of thermal spraying technology and surface engineering, in particular to a method for enhancing the tribological properties of nickel-based coatings by using ceramic nanoparticles. Background technique [0002] NiCrBSi self-fluxing alloy is made by adding B and Si elements on the basis of Ni-Cr alloy, which makes it exhibit excellent properties, such as high hardness, low melting point and good fluidity. During the spraying process, the B element in the alloy reacts with Cr, Ni and other elements to form Cr 2 Hard phases such as B and NiB are dispersed in the coating, which plays a role in dispersion strengthening of the coating. Si element is mainly dissolved in the base material to play a solid solution strengthening effect, and Cr element and C form carbides with higher hardness, so that The microhardness and strength of the alloy are greatly improved, and Si and B can expand the solid-liquid phase temperature ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/06C23C4/134C22C19/05C22C32/00B22F9/04
CPCC23C4/06C23C4/134C22C19/058C22C32/0063B22F9/04B22F2009/043B22F2009/042
Inventor 张超徐金勇孙国栋肖金坤
Owner YANGZHOU UNIV
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