Solid Lubricants Bushing is a high-performance product that breaks through the limitations of general bearings that rely on oil film lubrication. The inner structure supplies a permanent reservoir of lubricant for continuous restoration of the low friction bearing surface.
It is based on high-strength brass that has been centrifuge cast. It is embedded with graphite or MoS2 solid lubricants to make out the loading function.
The solid lubricants are rubbed on the shaft by frictional heat, and a lubricating film is formed during motion to protect the shaft from wear and extend the service life of the bushing. The lubricant is non-toxic and does not contain any abrasive substances. It also has low-wear, low speed characteristics and good load resistance.
Different solid lubricant formulations can offer varying tribological properties, so selecting the right one for your application is important. It is also critical to choose the best coating preparation procedures: spraying can produce more uniform coatings than dipping, but requires careful process control.
Molecular Origins of Low Friction
Coatings fabricated from lamellar transition metal dichalcogenide (TMD) materials such as MoS2 or those consisting of polymers such as PTFE are characterized by very low friction coefficients, typically in the 0.02-0.1 range. These coatings rely on a pseudo-two-dimensional structure consisting of stacked S-Mo-S "sandwich" layers that are bonded to the substrate by relatively weak van der Waals forces (see Figure 1).
The low vapor pressure of these TMDs has allowed them to be used in spacecraft environments where liquid lubricants could not. However, optimizing tribology in the vacuum environment can be challenging. This is because TMDs tend to oxidize if the coatings are not properly cured, reducing their effectiveness.
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