CN-121991739-A - In-situ modified repairing paste for bearing surface and preparation method thereof

Abstract

The invention discloses an in-situ modified repairing paste for a bearing surface and a preparation method thereof, and belongs to the technical field of bearing surface lubrication and maintenance. The in-situ modified repairing paste for the bearing surface comprises, by mass, 15-20% of a solid lubricant, 35-45% of a reactive metal oxide filler, 5-8% of an organic thickener, 1-5% of a functional auxiliary agent, 1-5% of a friction catalytic enhancer and the balance of a base oil carrier, wherein the in-situ modified repairing paste for the bearing surface prepared by the invention can be effectively deposited on the bearing surface and generate chemical reaction after being mixed with lubricating grease under the continuous running condition of equipment, so that a compact, high-hardness, high-bonding-strength and corrosion-resistant ceramic alloy layer is generated, and has important significance in improving the bearing performance, prolonging the service life, guaranteeing the running stability of equipment and realizing disassembly-free abrasion repairing.

Inventors

• SHI XIAOLI
• ZHENG KAITAO
• LIU XINZHI
• NI YAN
• HE JIANG
• ZHANG LIN
• HOU JINGQI
• WEI HE
• GU KAIZHI

Assignees

• 南京摩芯佩力科技有限公司

Dates

Publication Date

20260508

Application Date

20260115

Claims (7)

1. 1. The in-situ modified repairing paste for the bearing surface is characterized by comprising, by mass, 15-20% of a solid lubricant, 35-45% of a reactive metal oxide filler, 5-8% of an organic thickener, 1-5% of a functional auxiliary agent, 1-5% of a friction catalyst enhancer and the balance of a base oil carrier.
2. 2. The bearing surface in-situ modified repair paste of claim 1, wherein the solid lubricant comprises at least two functionally complementary materials, including at least one basic lubricating material selected from microcrystalline graphite, crystalline flake graphite or expanded graphite, and at least one extreme pressure lubricating and reaction raw material selected from molybdenum disulfide, tungsten disulfide or hexagonal boron nitride, and having a particle size of about 1.6 μm, wherein the mass ratio of the basic lubricating material to the extreme pressure lubricating and reaction raw material is (2:1) - (4:1).
3. 3. The in-situ bearing surface modification repair paste according to claim 1, wherein the reactive metal oxide filler is at least two selected from the group consisting of magnesium oxide and magnesium hydroxide, oxides providing a magnesium source, oxides providing an aluminum source, alpha-alumina, gamma-alumina and boehmite, oxides providing other metal sources, zinc oxide, titanium oxide and zirconium oxide, wherein the reactive metal oxide filler is nano powder, has an average particle size of 20-500nm, and is surface modified by a silane coupling agent.
4. 4. The bearing surface in-situ modifying repair paste of claim 1, wherein: the organic thickener is at least one selected from polyurea, lithium-based soap, composite lithium-based soap and bentonite; The functional auxiliary agent is at least two selected from an antioxidant, a rust inhibitor, a base number retention agent and a dispersing agent; The base oil carrier is at least one selected from poly alpha-olefin, ester oil, alkyl naphthalene and mineral oil.
5. 5. The modified repair paste of claim 1, wherein the friction catalyst enhancer is selected from at least one of the group consisting of: Rare earth oxide such as cerium oxide, lanthanum oxide, and neodymium oxide; Layered double hydroxides, namely magnesium aluminum hydrotalcite and zinc aluminum hydrotalcite; transition metal oxide, nano ferric oxide and nano copper oxide; Functional ionic liquid is ionic liquid containing phosphorus, sulfur or boron.
6. 6. The method for preparing the in-situ modified repairing paste for the bearing surface according to any one of claims 1 to 5, comprising the following steps: (1) Surface modification, namely mixing the reactive metal oxide filler with a surface modifier silane coupling agent in absolute ethyl alcohol, performing ultrasonic dispersion, heating and refluxing to perform surface modification treatment, and then washing and vacuum drying to obtain a modified reactive metal oxide filler; (2) Mixing 40% -60% of a base oil carrier, a solid lubricant, a modified reactive metal oxide filler and a friction catalyst enhancer to obtain uniform and stable pre-dispersion slurry; (3) The thickening and homogenizing, namely transferring the pre-dispersed slurry into a reaction kettle, adding the rest of base oil carrier, stirring and heating to 80-100 ℃, adding an organic thickening agent, and carrying out heat preservation and stirring at the temperature to fully homogenize the system; (4) And (3) post-treatment, namely adding a functional auxiliary agent under the stirring state, continuously stirring, then carrying out vacuum degassing to remove bubbles, and finally filtering through a 200-400-mesh filter screen to obtain the in-situ modified repairing paste for the bearing surface.
7. 7. The method of preparing an in-situ modified repair paste for bearing surfaces according to claim 6, wherein the ultrasonic dispersion conditions in the step (1) are dispersion for 30 minutes at 40kHz and 200W.

Description

In-situ modified repairing paste for bearing surface and preparation method thereof Technical Field The invention relates to an in-situ modified repairing paste for a bearing surface and a preparation method thereof, and belongs to the technical field of bearing surface lubrication and maintenance. Background Under the action of long-term alternating load and relative motion, the surfaces of the bearing roller way and the rolling body can be damaged by friction and abrasion to generate micro scratches, fatigue peeling, plastic deformation and the like, the micro damages can lead to the increase of the vibration amplitude of equipment, the reduction of the operation precision, the remarkable increase of the energy consumption and finally the failure of the bearing to cause direct production loss, so that the research and development of the technology for in-situ repair and performance reinforcement of the bearing abrasion surface of the equipment under the working condition of no shutdown has great engineering value and economic significance for improving the service safety of power equipment and reducing the cost of the whole life cycle. At present, main maintenance means aiming at bearing wear mainly comprise stopping and replacing the bearing and periodically filling external lubricant, wherein the stopping and replacing can fundamentally replace the failure parts, but the defects of long stopping time, high maintenance cost and influence on continuous production exist, the lubricant filling can only temporarily relieve the wear progress by reducing the friction coefficient, the generated wear pits and scratches cannot be repaired, a long-acting protective layer cannot be formed on the wear surface, and the problem of bearing wear failure is difficult to radically solve. In the prior art system, though related materials and technologies such as bearing repairing paste, lubricating oil functional additives, surface deposition coating and the like are appeared, the defects of single function and short action time are common, namely the repairing paste fills up a wear gap in a physical filling mode, has low bonding strength with a metal matrix and is easy to fall off under the action of load, the lubricating oil additives are oil agents, extreme pressure agents and the like, only can form a temporary lubricating film on a friction interface and cannot be metallurgically bonded with the matrix, the deposition coating technology is required to rely on severe off-line preparation conditions such as vacuum, high temperature and the like, in-situ treatment of a service bearing is difficult to realize, and in conclusion, the existing materials and technologies are difficult to perform synergistic chemical reaction with the metal matrix of the bearing in the friction dynamic process, so that a permanent surface modification layer with high hardness, high bonding strength and high wear resistance is constructed. In addition, in the prior art, repair is attempted through pre-buried chemical reaction, repair ion release is triggered through controllable corrosion, but a mild response mechanism of the repair ion release is difficult to match with a high-speed and high-pressure friction working condition in a bearing, and repair efficiency and reliability are limited in practical application. In summary, the existing bearing repairing and strengthening technology has the common defects of (1) passive and single repairing mechanism, multiple physical actions, weak combination of a repairing layer and a bearing steel matrix and poor durability, (2) lack of active and in-situ chemical reaction repairing capability designed for actual working conditions of the bearing, disjoint repairing process and tribological behavior, (3) partial formula dependence on expensive noble metal and rare earth materials, high cost and poor environmental protection, and (4) insufficient compatibility and long-acting synergetic research on main stream high-performance lubricating grease (such as polyurea grease and composite lithium grease) of the existing bearing when being used as a functional additive. Therefore, aiming at the specific application scene of the bearing, the novel repairing material capable of being deeply fused with the friction working condition is urgently needed, and a tough and firm protective layer is actively generated by triggering an in-situ chemical reaction at a friction interface so as to realize on-line, long-acting and reinforced repairing of the wear surface of the bearing. Disclosure of Invention The invention aims to solve or partially solve the problems of the prior bearing surface repairing technology, such as passive repairing mechanism, weak repairing layer binding force, poor suitability for working conditions and the like, and the invention aims to provide the bearing surface in-situ modified repairing paste which can trigger the chemical reaction of specific components in the bearing and a metal matrix