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Self-lubricating solid composite material and preparation method of self-lubricating solid coating

A solid self-lubricating, composite material technology, applied in metal material coating process, coating and other directions, can solve problems such as poor lubrication performance, achieve low friction coefficient and wear rate, improve comprehensive performance, and excellent high temperature wear resistance. Effect

Active Publication Date: 2012-02-29
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, CaF 2 Poor lubricating performance under medium and low temperature conditions

Method used

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  • Self-lubricating solid composite material and preparation method of self-lubricating solid coating
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Experimental program
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preparation example Construction

[0045] The present invention has no special limitation on the preparation method of the solid self-lubricating composite material, and is preferably prepared according to the following method:

[0046] The chromium carbide, nickel-chromium alloy, tungsten disulfide and calcium fluoride are mechanically ball-milled, mixed, dried, and melted to obtain a solid self-lubricating composite material.

[0047] The present invention has no special limitation on the melting method, and methods such as laser cladding, plasma spraying, and powder metallurgy can be used to form a coating on the substrate while melting the mixture.

[0048] In the present invention, the chromium carbide endows the composite material with good wear resistance; tungsten disulfide and calcium fluoride endow the composite material with good lubricity in a wide temperature range; The compatibility between tungsten and calcium fluoride makes the composite material have good comprehensive performance. The solid s...

Embodiment 1

[0088]Mix 21g of nickel-chromium alloy with a particle size of 30 μm to 45 μm, 49 g of chromium carbide with a particle size of 30 μm to 45 μm, 15 g of tungsten disulfide with a particle size of 1 μm to 2 μm, and 15 g of calcium fluoride with a particle size of 10 μm to 25 μm, and mix and bake After drying, the mixture is obtained;

[0089] Dissolving methyl cellulose in ether, adding the mixture to make a paste, coating the obtained paste on the surface of the austenitic stainless steel substrate, and drying to obtain a pre-coat;

[0090] Under the protection of nitrogen, the laser beam with a power density of 1.2kW is used to scan and irradiate the pre-coated coating to obtain a solid self-lubricating coating; wherein the laser beam is a carbon dioxide gas laser beam with a size of The length is 6 mm, the width is 3 mm, and the scanning speed is 4 mm; the overlapping rate of the multiple overlapping is 50%.

Embodiment 2

[0092] Mix 18g of nickel-chromium alloy with a particle size of 30 μm to 45 μm, 55 g of chromium carbide with a particle size of 30 μm to 45 μm, 13 g of tungsten disulfide with a particle size of 1 μm to 2 μm, and 14 g of calcium fluoride with a particle size of 10 μm to 25 μm, mix and bake After drying, the mixture is obtained;

[0093] Under nitrogen protection, a laser beam with a power density of 1.2kW is used to irradiate the 1Cr18Ni9Ti stainless steel base material to form a molten pool, and then the mixture is fed into the molten pool by nitrogen synchronous powder feeding, and nitrogen is used to protect the molten pool Avoid molten pool oxidation; Wherein, the laser beam is a carbon dioxide gas laser beam, the size is 6mm long, 3mm wide, and the scanning speed is 4mm; the feeding speed is 25g / min;

[0094] Continue to adopt the laser beam with a power density of 1.2kW to irradiate the solid self-lubricating composite material with multiple overlapping laser scans to f...

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Abstract

The invention provides a self-lubricating solid composite material, which comprises 15-30 wt% of nickel-chromium alloy, 40-60 wt% of chromium carbide, 10-20 wt% of tungsten disulfide and 10-20 wt% of calcium fluoride. The invention also provides a preparation method of a self-lubricating solid coating. By a laser cladding method, the self-lubricating solid coating is formed on a matrix material. The self-lubricating solid composite material can be firstly coated on the matrix material and forms a coating by laser cladding; and also the matrix material can be firstly irradiated by a laser beam to form a molten pool, and then the self-lubricating solid composite material is sent into the molten pool and is continuously irradiated to form the coating. The prepared self-lubricating solid coating has excellent wear resistance and good lubrication performance within the temperature range of room temperature to 600 DEG C, and can satisfy the usage requirement under severe working conditions.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a preparation method of a solid self-lubricating composite material and a solid self-lubricating coating. Background technique [0002] With the rapid development of aerospace and space technology, lubricating materials such as lubricating oil and grease used to slow down the friction and wear of equipment can no longer meet the requirements of use due to the decline in bearing capacity and attenuation of lubricating performance at high temperatures. Although solid lubricating particles such as solid lubricants can meet the temperature requirements as the anti-friction coating, soft metals have disadvantages such as low strength and poor wear resistance. Solid self-lubricating composite materials are composite materials formed by adding solid lubricants and other additional components with metal, ceramic or non-metal as the basic unit. It not only has high...

Claims

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Application Information

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IPC IPC(8): C22C29/02C22C32/00C22C30/00C23C24/10
Inventor 刘秀波何祥明杨茂盛郑晨王明娣傅戈雁石世宏陈正
Owner SUZHOU UNIV
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