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CN-121992393-A - In-situ growth MoS2Nanowire self-lubricating composite coating and preparation method and application thereof

CN121992393ACN 121992393 ACN121992393 ACN 121992393ACN-121992393-A

Abstract

The invention provides an in-situ growth MoS 2 nanowire self-lubricating composite coating, a preparation method and application thereof, and a laser-induced in-situ synthesis technology is adopted to generate a vertically oriented molybdenum disulfide MoS 2 nanowire on the surface of a steel base in situ. The process comprises four steps of steel base pretreatment, molybdenum transition layer formation by laser cladding, moS 2 nanowire generation by in-situ vulcanization reaction and epoxy resin densification treatment. By combining the cooperative strategy of laser cladding and vulcanization reaction, the wear resistance of the steel material is obviously improved. In addition, the formed nanowire array has excellent mechanical interlocking and self-lubricating effects, and can obviously improve the surface hardness and wear resistance of the material and reduce the friction coefficient by combining the interface strengthening effect of epoxy resin. The process has the advantages of controllable directional growth, high bonding strength, low energy consumption, good environmental protection and the like, and provides a new efficient and feasible method for in-situ construction and functionalization application of transition metal sulfide on the metal surface.

Inventors

  • SONG HAOJIE
  • GAO LI
  • PENG JING
  • JIA XIAOHUA

Assignees

  • 陕西科技大学

Dates

Publication Date
20260508
Application Date
20260115

Claims (7)

  1. 1. The preparation method of the in-situ growth MoS 2 nanowire self-lubricating composite coating is characterized by comprising the following steps of: Step 1, preprocessing the surface of a steel disc, namely coating molybdenum nanoparticle suspension after ultrasonic cleaning is carried out on the steel disc by using ethanol to carry out involution Jin Gangpan, and drying the steel disc at 70-85 ℃ to form a preset Mo layer with the thickness of 5-8 mu m; step 2, irradiating the sample obtained in the step 1 by using a fiber laser, so that Mo particles are melted into a steel matrix to form an Fe-Mo-C alloy transition layer, and cooling to form a nanocrystalline structure; Step 3, placing the sample obtained in the step 2 into a tube furnace, and introducing H 2 S/Ar mixed gas for 50-70 min when the temperature is increased to 280-320 ℃ to form MoS 2 crystal nuclei; Step 4, raising the temperature of the tubular furnace to 645-655 ℃, introducing sulfur vapor, and simultaneously applying a temperature gradient of 180-220 ℃ per mm in a direction perpendicular to the substrate to initiate a vulcanization reaction, so as to induce the vertical growth of MoS 2 nanowires along the [002] crystal direction; Step 5, performing impact reinforcement on the steel device growing with the MoS 2 nanowire by using pulse laser to realize densification treatment of the sample surface; And 6, immersing the steel device with the MoS 2 nanowire in an epoxy resin precursor, and then placing the steel device in an environment of 100-120 ℃ for curing to obtain the final self-lubricating composite coating.
  2. 2. The method for preparing the in-situ grown MoS 2 nanowire self-lubricating composite coating according to claim 1, wherein the concentration of the molybdenum nanoparticle suspension in the step 1 is 25-35 g/L.
  3. 3. The method for preparing the in-situ grown MoS 2 nanowire self-lubricating composite coating according to claim 1, wherein the volume fraction of H 2 S in the H 2 S/Ar mixed gas in the step 3 is 45% -55%.
  4. 4. The method for preparing the in-situ grown MoS 2 nanowire self-lubricating composite coating according to claim 1, wherein the time of the vulcanization reaction in the step 4 is 2-3 hours.
  5. 5. The method for preparing the in-situ growth MoS 2 nanowire self-lubricating composite coating according to claim 1, wherein the dipping time of the steel device grown with the MoS2 nanowire in the step 6 in epoxy resin is 30-60 min, and the curing time is 12-18 h.
  6. 6. An in-situ grown MoS 2 nanowire self-lubricating composite coating prepared according to the method of any one of claims 1-5.
  7. 7. The use of the in-situ grown MoS 2 nanowire self-lubricating composite coating according to claim 6 in mechanical components having self-lubricating, corrosion-resistant and impact-resistant functions.

Description

In-situ growth MoS 2 nanowire self-lubricating composite coating and preparation method and application thereof Technical Field The invention belongs to the field of processing and preparation of novel high-wear-resistance self-lubricating protective composite materials, and particularly relates to an in-situ growth MoS 2 nanowire self-lubricating composite coating, and a preparation method and application thereof. Background In the field of modern industry, wear-resistant materials are increasingly demanded, and in particular, in a high-strength and complex working environment, the requirements on wear resistance and self-lubricity are strict. Although the service life of mechanical parts is prolonged to a certain extent by the traditional wear-resistant coating technology, the performance of the wear-resistant coating is still not ideal under the conditions of high temperature, high load or extreme friction, especially in the occasions needing wear resistance and self-lubricating performance. Therefore, the development of new, functionalized coatings and composites is critical to solving this problem. Molybdenum disulfide (MoS 2) is a typical layered transition metal sulfide, the crystal of which is stacked by three atomic layers of sulfur-molybdenum-sulfur (S-Mo-S), atoms in the layers being bonded by strong covalent bonds, and the layers being acted upon by weak van der waals forces. The layered structure enables the MoS 2 to slip between layers during friction to form a sulfur-rich lubrication film, thereby significantly reducing the coefficient of friction and slowing down wear. Meanwhile, moS 2 has good chemical stability and high temperature resistance, and can still keep excellent self-lubricating performance and wear resistance under high temperature, high pressure and complex working conditions, so that the MoS 2 becomes an ideal material for wear-resistant protection and lubrication of the surfaces of mechanical parts. Currently, moS 2 coatings are mainly prepared by Physical Vapor Deposition (PVD), chemical Vapor Deposition (CVD), spray coating, hot dip coating, electrochemical deposition, and the like. These methods can improve the wear resistance of the mechanical part surfaces to some extent, but have significant disadvantages in terms of adhesion, structural controllability, wear resistance, high temperature stability, and cost and industrial applicability. First, the coating layer and the metal matrix are mostly dependent on physical adsorption or microcosmic bonding. The coating is easy to peel and lose efficacy under high load or high temperature, which affects the long-term stability. Secondly, the existing method is difficult to control the thickness, uniformity and crystal orientation of MoS 2, so that holes, cracks or uneven microstructure are easy to exist in the coating, and the wear resistance and self-lubricity of the coating under the extreme friction condition are further reduced. In addition, moS 2 is easy to generate oxidation or desulfurization reaction under the high-temperature environment, so that the lubricating performance is quickly degraded, and the application of the lubricating agent under the high-temperature, high-pressure and severe working conditions is further limited. The vapor deposition process equipment investment of PVD, CVD and the like is high, the operation is complex, the process period is long, the spraying or hot dipping method has simple process, but the compactness and durability of the coating are limited, and the industrialized application of the large-area and high-performance coating is not easy to realize. Disclosure of Invention The invention aims to provide an in-situ growth MoS 2 nanowire self-lubricating composite coating, a preparation method and application thereof, which can obviously improve the surface hardness and wear resistance of a material, reduce the friction coefficient and solve the problems of poor coating adhesion, high growth control difficulty and poor high-temperature stability in the prior art. The invention is realized by the following technical scheme: The preparation method of the in-situ growth MoS 2 nanowire self-lubricating composite coating comprises the following steps: Step 1, preprocessing the surface of a steel disc, namely coating molybdenum nanoparticle suspension after ultrasonic cleaning is carried out on the steel disc by using ethanol to carry out involution Jin Gangpan, and drying the steel disc at 70-85 ℃ to form a preset Mo layer with the thickness of 5-8 mu m; step 2, irradiating the sample obtained in the step 1 by using a fiber laser, so that Mo particles are melted into a steel matrix to form an Fe-Mo-C alloy transition layer, and cooling to form a nanocrystalline structure; Step 3, placing the sample obtained in the step 2 into a tube furnace, and introducing H 2 S/Ar mixed gas for 50-70 min when the temperature is increased to 280-320 ℃ to form MoS 2 crystal nuclei; Step 4, raising the temperatu