A kind of preparation method of high-temperature lubricating anti-adhesive anti-wear coating

Abstract

The invention discloses a preparation method of a high-temperature lubricating anti-stick and anti-wear coating. The method uses plasma thermal spraying equipment to prepare the coating, and includesthe four steps of performing surface treatment on a metal matrix, spraying a transition layer on the metal matrix, spraying a gradient layer on the transition layer and spraying a surface layer on thegradient layer. The coating has the characteristics of long-term resistance to high temperature of 800 DEG C, thermal shock resistance, high-temperature lubricating anti-stick performance, locking, high load-bearing capacity, ablation resistance, high-temperature fretting wear resistance and good machining performance, and can improve the use reliability and life of heavy-duty high temperature parts and meet the practical application needs of surface protection of mechanical components under severe working conditions.

Description

technical field [0001] The invention relates to a preparation method of a high-temperature lubricating anti-sticking and anti-wear coating, in particular to high-temperature lubricating anti-sticking, anti-ablation and anti-fretting wear on the surface of fretting metal parts above 800°C, which belongs to composite material and coating technology field. Background technique [0002] High-temperature mechanical components in the fields of energy and chemical industry, nuclear power, ships, and aviation, such as the hinge, rotation / transmission and other core mechanisms of large-scale coal chemical heavy-duty high-temperature pyrolysis furnaces, not only undertake the gravity of the furnace body and materials, but also meet the requirements of the inner and outer furnace bodies. The axial and radial relative movement and the relative sliding and micro-movement of metal parts, and the long-term heavy load (> 70 tons) and high temperature (≥ 800 ℃) working conditions, resulti...

AI Technical Summary

Problems solved by technology

[0002] High-temperature mechanical components in the fields of energy and chemical industry, nuclear power, ships, and aviation, such as the hinge, rotation / transmission and other core mechanisms of large-scale coal chemical heavy-duty high-temperature pyrolysis furnaces, not only undertake the gravity of the furnace body and materials, but also meet the requirements of the inner and outer furnace bodies. The axial and radial relative movement and the relative sliding and micro-movement of metal parts, and the long-term heavy load (> 70 tons) and high temperature (≥ 800 ℃) working conditions, resulting in metal parts (connecting rod / pin shaft, rotary joint ) frequent high-temperature sticking / sticking, ablation or severe high-temperature fretting wear (eccentric wear, thin neck) and other problems, resulting in unstable operation of the equipment, stalling, or even damage, bringing major safety hazards and economic losses to production

[0003] In the existing anti-sticking and anti-wear technology, the high-temperature-resistant protective coating such as CN105969090A is used, mainly to protect the surface of the titanium ingot from being oxidized and cracked at a constant temperature of 1000 ° C for 8 hours, but due to the epoxy resin and other polymers in the coating Carbonization or pulverization above 300°C results in a lifespan of only a few hours; the use of silver plating on the surface causes anti-sticking failure due to the softening of silver at around 600°C; the use of phosphate composite solid lubricant (graphite, molybdenum disulfide, etc.) coatings, For example, CN106336692A and CN102532962A, due to the high-temperature brittleness of phosphate and the limitation of coating thickness, the load-carrying performance is poor, and graphite and molybdenum disulfide are oxidized above 400°C, so they cannot be used in heavy-duty high-temperature conditions for a long time Use; use micro-arc oxidation technology, such as CN101092732A, to prepare 40-100um zirconia-alumina dual-phase gradient ceramic coating on the surface of zirconium alloy, which can improve the wear life of artificial joints at low temperature, but due to the lack of high temperature coating Poor high temperature anti-sticking and anti-wear properties due to self-lubricating properties

Using thermal spraying technology, such as CN103103470B, involves thermal spraying on plastic or polymer blanks to prepare anti-adhesive thick coatings, which can reduce the possibility of adhesion between polymer materials and coatings, and is mainly used to overcome medium and low temperatures such as Teflon The coating is not wear-resistant and easy to deform, but the coating lacks self-lubricating properties at high temperatures (400°C to 800°C and above), so it is difficult to achieve high-temperature lubrication, anti-sticking and high-temperature fretting wear resistance between metal surfaces; CN104357792B invented a titanium alloy high-temperature oxidation-resistant and anti-fretting wear coating. Because hexagonal boron nitride is used as a high-temperature lubricant, the coating has a lower coefficient of sliding friction ( ≤0.4 ), but its anti-fretting wear life (friction cycle or cycle) is not obvious

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