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CN-121992333-A - Textured coating for sliding bearing and preparation method thereof

CN121992333ACN 121992333 ACN121992333 ACN 121992333ACN-121992333-A

Abstract

The invention discloses a textured coating for a sliding bearing and a preparation method thereof, belonging to the technical field of plasma spraying coatings. The textured coating for the sliding bearing is prepared by the following steps of (1) carrying out laser pretreatment on bearing steel to obtain a textured substrate, (2) mixing a solvent, a binder, titanium nitride and titanium powder, and ball milling to obtain a suspension, and (3) spraying the suspension on the textured substrate by using a plasma spraying mode to obtain the textured coating on the sliding bearing. The textured coating for the sliding bearing prepared by the invention has excellent hardness and friction resistance.

Inventors

  • JING ZHENGBIAO
  • SONG LIN
  • YU JING
  • QIAO JIANCHUN
  • YU ZELIANG
  • XIONG BAOYU

Assignees

  • 成都工业职业技术学院

Dates

Publication Date
20260508
Application Date
20260128

Claims (10)

  1. 1. A method for preparing a textured coating for a sliding bearing, comprising the steps of: (1) Carrying out laser pretreatment on the bearing steel to obtain a textured matrix; (2) Mixing a solvent, a binder, titanium nitride and titanium powder, and ball-milling to obtain a suspension; (3) Spraying the suspension onto the textured substrate by using a plasma spraying mode to obtain a coating; the binder is prepared by the following method: S1, 4' -diaminodiphenyl methane reacts with cyanuric chloride to generate an intermediate 1, S2, reacting the intermediate 1 with L-O-phosphoserine to generate an intermediate 2, S3, reacting the intermediate 2 with 2-aminophenylboric acid to generate the adhesive.
  2. 2. The method for producing a textured coating for sliding bearings according to claim 1, wherein in step S1, the feed molar ratio of 4,4' -diaminodiphenylmethane to cyanuric chloride is 1 (2.03-2.05).
  3. 3. The method for producing a textured coating for sliding bearings according to claim 1, wherein in step S2, the molar ratio of the intermediate 1 to L-O-phosphoserine is 1 (2.04-2.06).
  4. 4. The method for producing a textured coating for sliding bearings according to claim 1, wherein in step S3, the feeding molar ratio of the intermediate 2 to 2-aminophenylboronic acid is 1 (2.05-2.08).
  5. 5. The method of producing a textured coating for sliding bearings according to claim 1, wherein in step (1), the laser pretreatment is performed at a scanning speed of 80 to 100mm/s and a repetition rate of 25 to 30KHz.
  6. 6. The method of producing a textured coating for sliding bearings according to claim 1, wherein in step (1), the pulse width of the laser pretreatment is 5-10ns.
  7. 7. The method for producing a textured coating for sliding bearings according to claim 1, wherein in the step (2), the ratio of the solvent, the binder, the titanium nitride and the titanium powder is 7 (0.1-0.15): 1.5-2): 1-1.5.
  8. 8. The method of producing a textured coating for sliding bearings according to claim 1, characterized in that in step (3), the arc power of the plasma spraying is 70-90kW.
  9. 9. The method for producing a textured coating for sliding bearings according to claim 1, wherein in the step (3), the moving speed of the plasma-sprayed spray gun is 200 to 300mm/s.
  10. 10. Textured coating for sliding bearings, characterized in that it is obtained by the preparation method according to any one of claims 1 to 9.

Description

Textured coating for sliding bearing and preparation method thereof Technical Field The invention relates to the technical field of plasma spraying coatings, in particular to a textured coating for a sliding bearing and a preparation method thereof. Background Roller cone drill bits are one of the most critical rock breaking tools in oil and gas exploration and development, and the bearing system directly determines the service life and drilling efficiency of the drill bit. The sliding bearing is used as a core bearing component of the roller bit, and the sliding bearing is outstanding in friction and wear problems when working under complex working conditions such as low-speed heavy load, strong impact vibration, high temperature and high pressure, poor lubrication and the like for a long time, and becomes a main bottleneck for restricting the service life of the roller bit. The prior art has increased its service life by preparing a wear-resistant coating on the bearing surface. However, the existing wear-resistant coating still has certain defects, part of the high-hardness coating has larger brittleness, is easy to crack or peel under the action of strong impact and alternating load, has higher friction coefficient under the poor lubrication condition, and is difficult to realize the cooperative promotion of high strength, low friction and wear resistance. Therefore, aiming at the service requirement of the sliding bearing under the complex working condition of oil and gas drilling, a coating with high strength and high wear resistance is developed, and the method has important engineering application value and practical significance for prolonging the service life of the roller bit, improving the drilling efficiency and reducing the operation cost. The Chinese patent publication No. CN119144953A discloses a preparation method of a composite coating of a sliding bearing and the composite coating of the sliding bearing, the method comprises the steps of drying nickel-based priming alloy powder and copper-based alloy surface layer powder, uniformly feeding the nickel-based priming alloy powder to the surface of the sliding bearing aligned with a cladding head through a scraping disc type pressure powder feeder based on a first technological parameter, melting the nickel-based priming alloy powder into molten drops, forming a micro-molten pool with the surface of the sliding bearing, continuously cladding to form a nickel-based priming layer, cooling the sliding bearing with the surface of the surface-clad nickel-based priming layer, polishing the nickel-based priming layer to be smooth, uniformly feeding the copper-based alloy surface layer powder to the surface of the nickel-based priming layer through the scraping disc type pressure powder feeder based on a second technological parameter, and continuously cladding the copper-based alloy surface layer on the surface of the nickel-based priming layer to obtain the sliding bearing with the composite coating, wherein the wear resistance of the sliding bearing is required to be improved. Disclosure of Invention Aiming at the defects existing in the prior art, the invention aims to provide a textured coating for a sliding bearing and a preparation method thereof. A method of preparing a textured coating for a sliding bearing comprising the steps of: (1) Carrying out laser pretreatment on the bearing steel to obtain a textured matrix; (2) Mixing a solvent, a binder, titanium nitride and titanium powder, and ball-milling to obtain a suspension; (3) Spraying the suspension onto the textured substrate by using a plasma spraying mode to obtain a textured coating on the sliding bearing; the binder is prepared by the following method: S1, reacting 4,4' -diaminodiphenyl methane with cyanuric chloride to generate an intermediate 1, wherein the reaction equation is shown as follows: S2, reacting the intermediate 1 with L-O-phosphoserine to generate an intermediate 2, wherein the reaction equation is shown as follows: S3, reacting the intermediate 2 with 2-aminophenylboronic acid to generate a binder, wherein the reaction equation is shown as follows: In the step S1, the feeding molar ratio of the 4,4' -diaminodiphenyl methane to the cyanuric chloride is 1 (2.03-2.05). In the step S2, the feeding molar ratio of the intermediate 1 to the L-O-phosphoserine is 1 (2.04-2.06). In the step S3, the feeding molar ratio of the intermediate 2 to the 2-aminophenylboronic acid is 1 (2.05-2.08). In the step (1), the scanning speed of the laser pretreatment is 80-100mm/s, and the repetition frequency is 25-30KHz. In the step (1), the pulse width of the laser pretreatment is 5-10ns. In the step (2), the feeding ratio of the solvent, the binder, the titanium nitride and the titanium powder is 7 (0.1-0.15): 1.5-2): 1-1.5. In the step (3), the arc power of the plasma spraying is 70-90kW. In the step (3), the moving speed of the spray gun for plasma spraying is 200-300mm/s. A textured coa