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Solid lubricants include for example 0.05 – 0.2 μm thin hard gold layers, which are added as surface layers on top of the actual contact material.
Among the various contact lubricants offered on the market, contact lubrication oils have shown performance advantages. They are mostly synthetic, chemically inert and silicone-free oils such as for example the DODUCONTA contact lubricants which differ in their chemical composition and viscosity.
For sliding contact systems with contact forces < 50 cN and higher sliding speeds, oils with a lower viscosity (< 50 mPa·s) are preferential. For applications with higher contact forces and operating at higher temperatures, contact oils with a higher viscosity are advantageous. Contact oils are mainly suited for applications at low current loads. At higher loads and in situations where contact separation occurs during the sliding operation, thermal decomposition may be initiated, which causes the lubricating properties to be lost.
