Silicon Nitride Ceramic Bearing Ball

Feature

BNS Ceramic Ball bearings made of silicon nitride, silicon carbide, zirconia oxide and alumina oxide are kept in our stock series. They are advantageous in having a longer service life, lower friction resistance, higher seizure resistance, higher corrosion resistance, higher rigidity, higher temperature resistance ( up to 800C) lightweight (40% of bearing steel), non magnetic, and insulated. They can be used even in an extra high – vacuum environment.

Physical Properties

Item	Density	Coefficient	Elasticity Modulus	Poisson’s Ratio	Hardness (HV)	Hardness (HRC)	Bending Strength	Compressive Strength
Unit	g/cm3	10-6/k	Gpa				Mpa	Mpa
Si3N4	3.23	3.2	300-320	0.26	1500-1800	75-80	200	1400
Item	Fracture Toughness	Thermal Conductivity	Electrical Resistivity	Highest Temp	Acid and Alkali Corrosion resistance performance		Stress Cycles (50% failure probalility)
Unit	Mpa·m1/2	W/mk	Ω·mm2/m	℃	Strong		Times
Si3N4	6.0-7.0	18	1018	800			107-109
Item	Dimensions stability		Certrifugal Force	Non-lubrication Friction	Magnetism		Rolling contact Fatigue Failure mode
Unit
Si3N4	With the temp,change is Small		small	small	None		Peel Off

Comparison