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Preparation method of nanostructure high temperature lubricating composite coating

A composite coating and nanostructure technology, applied in the coating, metal material coating process, melt spraying and other directions, can solve the problems of uneven distribution, low coating bonding strength, cracks and pores, etc., and achieve smooth transportation. , The distribution of each phase is uniform, and the effect of eliminating the layered structure

Active Publication Date: 2019-10-11
XI AN JIAOTONG UNIV +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for preparing a nanostructured high-temperature lubricating composite coating to solve the problems of uneven distribution of phases in the composite coating, cracks and pores in the coating, etc. Many defects and low bonding strength of the coating can effectively improve the structure of the composite coating, improve the mechanical properties of the composite coating and the tribological properties in a wide temperature range

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  • Preparation method of nanostructure high temperature lubricating composite coating
  • Preparation method of nanostructure high temperature lubricating composite coating
  • Preparation method of nanostructure high temperature lubricating composite coating

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preparation example Construction

[0039] The invention discloses a method for preparing a nanostructure high-temperature lubricating composite coating, which effectively improves the structure of the composite coating through spray granulation and heat treatment, reduces defects such as cracks and pores in the composite coating, and improves the microhardness of the composite coating and bonding strength and other mechanical properties, and at the same time realize the continuous lubrication performance of the composite coating in a wide temperature range; the specific steps are as follows:

[0040] S1. Mixed powder ratio and ball milling

[0041] Weigh the powder according to the composition design ratio of the composite coating, and weigh 60-75% of NiCrAlY, 10-15% of Mo, and 15-25% of Ag respectively according to the mass fraction calculation;

[0042] Put the weighed mixed powder in a zirconia ball mill tank, add a certain amount of methanol as a process control agent, fill it with nitrogen, seal it and car...

Embodiment 1

[0057] The spray-drying method was used to prepare the nanostructure spray powder. The powder mixed in proportion is put into a ball mill tank for high-energy ball milling to prepare uniformly mixed nano-mixed powder, and then the mixed powder is prepared into a suspension for spray granulation. The prepared nanostructure spray powder was sieved, and the powder with suitable particle size was selected for spray test. Before spraying, the prepared spraying powder is firstly dried in a vacuum drying oven to ensure smooth powder feeding during the spraying process. Preheating the substrate sample before spraying can improve the bonding strength of the composite coating. Spraying a layer of NiAl bonding layer between the composite coating and the base material can effectively improve the bonding strength of the composite coating. The prepared coating effectively eliminates the layered structure of the traditional composite coating, and the distribution of the phases in the coati...

Embodiment 2

[0059] The composite coating of Example 1 was subjected to vacuum heat treatment at 400°C in a vacuum heat treatment furnace with a heating rate of 10°C / min, kept for 1 hour, and then cooled with the furnace. After heat treatment, defects such as cracks and pores in the composite coating structure are relatively reduced, such as figure 2 shown. The microhardness of the composite coating is 464.6HV, which is significantly higher than that before heat treatment. According to the requirements of ASTM C633 standard, the bonding strength of the composite coating measured on a universal testing machine is 49.0MPa, which is relatively higher than that before heat treatment. At the same time, the tribological properties of the composite coating in a wide temperature range were tested on the UMT high-temperature friction testing machine. It was measured that the friction coefficient of the composite coating in the temperature range from room temperature to 900°C was lower than 0.5, a...

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Abstract

The invention discloses a preparation method of a nanostructured high-temperature lubricating composite coating. The preparation method comprises the following steps: weighing NiCrAlY, Mo and Ag powder in parts by mass, then mixing the powder, adding methanol and introducing nitrogen gas for sealing, performing ball milling to prepare mixed powder; adding deionized water to the mixed powder afterball milling to prepare a suspension liquid, and then performing spraying granulation to prepare nanostructured spraying powder; cutting a substrate material bar into samples, polishing surfaces of the samples, then ultrasonically cleaning, performing sand blasting treatment on the ultrasonically cleaned samples, and ultrasonically cleaning again after the sand blasting treatment; performing preheating treatment on the ultrasonically cleaned samples, and then performing spraying treatment on the preheated samples by adopting a plasma spraying method with the prepared spraying powder; and performing thermal treatment on the sprayed samples, and then cooling with a furnace to prepare a NiCrAlY-Mo-Ag composite coating. The preparation method disclosed by the invention effectively improves anorganizational structure of the composite coating, and improves the mechanical properties and the tribological properties in a wide temperature range of the composite coating.

Description

technical field [0001] The invention belongs to the technical field of coating materials, and in particular relates to a preparation method of a nanostructure high-temperature lubricating composite coating. Background technique [0002] With the rapid development of high-tech industries such as aerospace and nuclear industry, higher performance requirements are put forward for materials working under extremely harsh working conditions such as high temperature, high pressure and high speed, such as high thrust-to-weight ratio aeroengine turbine shafts, foil air bearings , thermal power machinery high temperature bearings, cylinder bushings, shaft sleeves, etc., among which the lubrication and wear resistance of related moving parts have become the technical key that affects the reliability and service life of the entire equipment system. Therefore, there is an urgent need to use the principles of tribology to construct new high-temperature lubricating materials to solve the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/073C23C4/134C23C4/123C23C4/18
Inventor 李博高义民李聪郑巧玲李烨飞郑开宏王娟
Owner XI AN JIAOTONG UNIV
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