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Reary stock for delivery or by our contracts.
Great advantages are achieved with machine tool applications
Automated electronic assembly
Diesel fuel injection pumps
Food processing equipment
*25% of all electrical energy produced is used to power some type of electric motor. Imagine the savings in resources if all motors were to run with ceramic hybrid ball bearings!
60% lighter than steel balls
Up to 55% higher running speeds.
Centrifugal forces reduced with 60% less rotating mass.
Less rotating mass means faster acceleration and deceleration.
Lower vibration levels results in finer surface finishes.
Higher speedability with grease or oil lubrication.
Lower starting torque loads.
Reduced ball skid results in a "truer" running bearing.
Less heat build up results in less friction and longer lubricant life.
Dissipates heat quickly.
35% less thermal expansion
50% less thermal conductivity.
Fatigue life increased.
Corrosion resistant in harsh chemical atmospheres.
Performs up to 15 times longer in poor lubrication environments as compared to steel.
50% higher modulus of elasticity
(Resistance to denting)
Improved spindle rigidity
Naturally fatigue resistant
Low adhesive wear
Improved lubricant life
Superior corrosion resistance
Ceramic is a natural insulator, and is beneficial where electric motor design requires a high degree of electrical insulating properties between the armature and field windings. The service life of conventionalsteelball bearings in electric motors is sometimes reduced, due to pitting and corrosion caused by trace discharging, between the rings and balls. Ceramic hybrids do not suffer from this, due to their natural insulating properties. Due to their inherent longer service life, itresults in a more reliable, and longer lasting product.
Due to a minimum level of Adhesive Wear,bearing components and lubricants last much longer, saving you expensive service and repair time.
High Hot Strength
High compressive and flexural strength over a wide temperature range. Lends itself for use to 2200 degrees F.
Specific density of 3.2 compared to 7.8 for steel. At high bearing operating speeds, the bearing balls have a centrifugal force which may exceed the external loads on the bearing. The low density of ceramics can reduce this load considerably.
While bearing steel is in the RC 58-64 hardness range, silicon nitride has a hardness of RC 75-80 and offers excellent wear resistance.
Coefficient of Friction
Silicon nitride has a coefficient of friction which is significantly lower, especially under marginal lubrication conditions. It also exhibits better resistance to scuffing and seizing than bearing steel.
Silicon nitride is unaffected by most common corrosive agents, and is well-suited for use in hot corrosive atmospheres, or where lubricants have been known to attack conventional bearing steels.
Long Fatigue Life
Recent improvements in purity and grain structure have given silicon nitride a high stress fatigue life equal to, or better than, that of bearing steels. Some tests have shown life 3 to 5 times that of M-50 steel.
Low Coefficient of Thermal Expansion
This property has made it difficult to mount a ceramic bearing on a steel shaft (which expands 3 times faster than ceramic). The steel shaft may crack a ceramic bearing "ring", due to the thermally induced tension stresses created in the ceramic ring.
To date, the most promising use is with bearings using ceramic balls only. Mounting difficulties and manufacturing intricacies, with their associated high costs, have slowed acceptance and potential usage of the all-ceramic bearing.
Hybrid bearing applications from small high-speed turbines to larger grease lubricated machine tool spindles have achieved good results and have been very successful.