Specialist Coatings and Lubrications

Tungsten Disulphide has become a popular coating in a variety of applications including NASA, military, and aerospace uses. It is heavier, more stable, and has an even lower coefficient of friction than MoS2, giving it the capacity to slow corrosion amongst some materials as well as combat excessive wear and other issues such as seizing, galling, and fretting. As a coating there is no unnecessary build up as it is only 0.5 microns thick, preventing it from bonding to itself. It also will not lead to contamination in an ultra-high vacuum as it is inert, non-magnetic, and non-toxic. It is a suitable coating for both standard and hybrid bearings.

XtrChrome is a nodular, thin, and dense chrome coating that is applied to bearing components using a method that guarantees precise deposition. It has many benefits including increased surface hardening, bearing life, and energy-saving, as well as a reduction in cost, production lead time, and surface friction.

XtrChrome is used within a wide variety of industries such as naval, semiconductor, pharmaceutical, oil & gas, and food processing. It is useful as a coating for bearings and some particular bearing surfaces made from 52100, M-50, M-50 NIL, BG-42, 440C, and all pH-basis metals, allowing bearing surfaces to run longer and cooler.

The surface texture allows for high-quality performance even in extreme environments, especially when used with ceramic rolling elements. Lubrication is held within the nodular microscopic surface structure, allowing a number of benefits including fast acceleration without full ball loading, emergency rundown due to loss of lubrication, oscillating movements that do not complete a full revolution, environments that do not allow for lubrication, and low rotational speeds. Fretting corrosion caused by the micro displacement of the bearing rings can be significantly reduced whilst increasing speed capabilities at lower operating temperatures.

XtrChrome Coating Advantages:

• Increased wear-resistance due to 78HRC surface hardness
• Corrosion-resistance exceeding 440C stainless steel, with additional chemical resistance
• Reduced friction and wear in application
• Lower maintenance and part replacement costs
• Complete adhesion to base metal: no chipping, flaking, cracking, or peeling
• Reduced micro-adhesion
• Nodular surface gives improved adhesion strength of lubrication film
• XtrChrome coated components are more economic and readily available the 440C Stainless Steel
• Increased running capabilities with a lower coefficient of friction
• FDA approved for product contact

XtrPoly is a polymer that is injected and cured to seal the volume between the rolling elements and races inside a bearing. XtrPoly ensures there is no need for additional lubrication during a bearings life as the polymer is filled with a lubricant that is expelled under load, providing constant and consistent lubrication within the bearing system.

XtrPoly is a solid, helping to block debris and reduce foreign contaminants being introduced to the bearing. By significantly reducing intrusion, XtrPoly can greatly extend the life of bearings. Moreover, its solidness makes it excellent at preventing drip from the bearing which can cause contamination within the environment, making it ideal in environments where grease and oil leakage needs to be avoided.

XtrPoly filled bearings have lower speed limitations than standard oil- or grease-lubricated bearings.

XtrPoly does not change the dimensional tolerances of bearings, instead simply filling the spaces between the rolling elements and the cage. This allows standard and non-standard bearings to be filled.

Greases and Oils are used for a majority of bearings in order to decrease wear on rolling elements. They can easily be altered to meet the specifications of different applications and can be added to both hybrid and full ceramic bearings to improving their performance, such as increasing speed and reducing noise and ball skidding.

Special lubricants are required for high-temperature, high-speed, or high-load applications. All UNASIS hybrid bearings can be lubricated to suit specific requirements. Here at UNASIS, we have specialist lubrications that are suitable for a wide range of applications, including high-vacuum compatibility, radiation and chemical resistance, as well as food-grade applications. If you suspect you may need specialist lubrication, get in touch today to discuss your needs with our experts.