Research and application of bonded solid lubricating coatings (3)

In recent years, metal and ceramic bonded solid lubricating coatings have developed rapidly. The film forming technologies include electrochemical composite co-plating, powder metallurgy, self-managing, plasma thermal spraying and laser thermal spraying. At present, metal-bonded solid lubricating coatings that have been practically applied at home and abroad include Ni-P-graphite, Ni-P-graphite-SiC, Ni-P-carbide, Ni-P-BN, Ni-P-SiC, Ni-PTFE, Ni-fluorinated graphite, Cu–(CF)n, Ni-graphite, Cu-In and Ni-copper alloy-CaF2-Ag-glass, etc.; in the field of ceramic bonded solid lubricating coatings, research The focus is on trying to apply it to the cylinder and piston surfaces of highly efficient adiabatic engines to increase engine efficiency, but there is still a certain distance from the utility.

In addition to the above-mentioned organic and inorganic two-type bonded solid lubricating coatings, in recent years, with the advancement of organic-inorganic nanocomposite technology, it has become possible to prepare organic-inorganic composite bonded solid lubricating coatings, and experts are currently developing Various types of organic-inorganic composite bonded solid lubricating coatings, it is hoped that such coatings can combine the advantages of both organic and inorganic coatings, and have excellent comprehensive physical and mechanical properties while solving a wide temperature range. Tribological problems can be considered as a promising bonded solid lubricant coating.

2.3 Performance characteristics of bonded solid lubricating coating a. Since the bonded solid lubricating coating is relatively thin, it can be used on almost all friction parts without changing the size of the parts. The mechanical equipment uses bonded solid lubrication coating technology to improve the mechanical design and eliminate the complex oil pump oil system necessary for oil lubrication.

b. Compared with conventional grease lubrication, bonded solid lubricating coatings can be effectively lubricated under high temperature, high load, ultra low temperature, ultra high vacuum, strong redox and strong radiation environment conditions, and some varieties of bonded solid lubricating coatings The bearing capacity of the layer is ten times or even several times higher than that of conventional grease (Fig. 3), and there are no problems such as pollution and oil leakage in grease lubrication. It can be used as a lubricating material for mechanical parts in special working conditions and taboo grease. .

c. Bonded solid lubricating coating is suitable for the substrate of many types of materials, and does not change and flow with time. It can be used as a lubricating material for mechanical parts that are frequently started and occasionally started for a long time. Some bonded solid lubricating film It has good compatibility with lubricating grease, and it can produce good compounding effect, such as improving initial running-in, preventing starting bite and prolonging service life; and some varieties can be effectively lubricated under water medium conditions.

d. Bonded solid lubricating coating not only has outstanding tribological properties, but also has excellent anti-corrosion performance and dynamic sealing performance, which can prevent mechanical vibration and reduce mechanical noise.

e. Bonded solid lubricating coatings are applicable to engineering plastics, rubber, wood materials, fiber materials and ceramic material parts, which are difficult to lubricate common lubricating greases, in addition to metal parts, to solve the tribological problems of these material parts.

f. The applicable range of certain types of bonded solid lubricating coatings is limited. In order to meet the lubrication requirements under various working conditions, a variety of different types of bonded solid lubricating coatings must be prepared. Difficulties, and therefore need to be used under the guidance of experienced engineers or experts.

g. Compared with grease lubrication, the complementary process of bonding solid lubricating coating is more complicated and does not have the cooling effect like grease lubrication, so it is generally not suitable for high-speed sliding mechanical parts.

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