Määrimisvõime

Määrimisvõime refers to the ability of a substance, typically a lubricant, to prevent direct surface-to-surface contact between moving parts. This prevents wear, friction, and heat generation. A high määrimisvõime means the substance can effectively maintain a separating film under pressure and shear forces.

The effectiveness of a lubricant's määrimisvõime is influenced by several factors, including its viscosity, which is its resistance to flow. Higher viscosity generally correlates with better film strength, especially at higher temperatures. Additives can also significantly enhance määrimisvõime. For instance, extreme pressure (EP) additives form chemical layers on metal surfaces under high load conditions that prevent welding. Anti-wear additives also reduce friction and wear by creating sacrificial films.

The concept is crucial in various mechanical applications, from internal combustion engines and gearboxes to bearings and hydraulic systems. Insufficient määrimisvõime can lead to accelerated component degradation, premature failure, and increased energy consumption due to friction. Therefore, selecting a lubricant with appropriate määrimisvõime for the specific operating conditions is vital for maintaining the longevity and efficiency of machinery. The ability to withstand varying loads, temperatures, and speeds determines the overall performance and protective qualities of a lubricant.