Lubrication & Coatings
Lubrication, Current Insulation & Hybrid Solutions
Polymer Matrix Lubrication · Anti-Electro-Erosion Ceramic Coating · Silicon Nitride Hybrid Bearings
(vs. conventional grease)
DC77 Coating
Si₃N₄ Hybrid Bearings
DUROLUB DL
Conventional grease typically fills only 25–30% of the bearing space. Rolling elements expel excess grease from the raceway during operation, leaving most of it stationary. Temperature fluctuations cause condensation in the unfilled space; water mixes with oil to form an emulsion, leading to premature bearing failure. Periodic relubrication is required, increasing maintenance costs.
DUROLUB DL consists of an ultra-high molecular weight polymer combined with a synthetic, thermally stable base oil. After heat treatment, it forms a solid porous matrix inside the bearing space, completely filling the entire cavity. During operation, DUROLUB DL rotates together with the cage and rolling elements, supplying oil through sliding contact surfaces. As temperature rises, the thermal expansion of the polymer matrix is lower than that of the base oil, releasing more oil. At rest, the matrix re-absorbs the excess oil. Rolling bearings thus maintain an optimal lubricating film under all operating conditions.
DUROCOAT DC77
Electro-erosion (Elektroerosion) is a well-known problem in the rolling bearing industry. Electric current passing through a bearing causes three typical types of damage: Microcraters — only a few micrometres in size, caused by locally high temperatures in the contact zone where material melts; Ripple/washboard effect — appearing perpendicular to the raceway, this is a secondary mechanical vibration damage caused by rolling elements passing over microcraters; and Lubricant blackening — locally high temperatures oxidise, blacken and harden the lubricant, eventually causing complete lubrication failure.
DUROCOAT DC77 applies a ceramic coating to the outer or inner ring of the bearing. The bearing ring requiring coating is pre-machined to accommodate the required coating thickness. All tolerances remain unchanged — the bearing is ready to install with no modification to adjacent structures. THB is not limited to standard products; DC77 can be applied to virtually all radial and axial bearing types and sizes.
HYTEC
In high-speed, high-temperature, electro-erosion, or insufficient lubrication environments, conventional all-steel bearings face increased centrifugal forces, inadequate lubricating film, and damage from electric current passage, resulting in shortened service life and frequent downtime.
HYTEC hybrid bearings combine standard rolling bearing steel rings with silicon nitride (Si₃N₄) rolling elements. All dimensions and tolerances remain unchanged, enabling direct replacement of standard bearings without modifying adjacent structures.
Explore Technical Specifications
Comprehensive technical documentation to assist engineers with product selection and application design
DUROLUB DL
Variant specifications, speed guide values, derating factors, low-temperature applications, assembly notes
DUROCOAT DC77
Standard coating specifications, dimensional limits, resistance/breakdown characteristics, support ring coating
HYTEC Hybrid Bearings
Si₃N₄ material properties, seven key technical advantages, manufacturing process, applicable bearing types
Find the Optimal Lubrication and Surface Treatment for Your Bearings
THB provides complete technical support from single sample testing through to mass production.