Common Bearing Material Performance Comparison Table

Common Bearing Material Performance Comparison Table

Performance	Unit	GCr15	9Cr18	Si3N4	ZrO2
density	g/cm3	7.8	7.9	3.2	6
Thermal expansion	10-6/	11	17	3.2	10.5
Elastic Modulus	GPa	208	200	320	210
Poisson's ratio		0.3	0.3	0.26	0.3
hardness		800	700	1700	1300
Bending strength	MPa	2400	2600	900	1000
Compressive strength	MPa			3500	2000
toughness	Nm/cm2	20	25	7	11
Thermal conductivity	W/mk	30-40	15	3.5	2.5
Specific resistance	mm2/m	1	0.75	1018	1015
Specific heat		450	450	800	400
Operating temperature		120	150	1000	800
Corrosion		no	weak	Strong	Strong
Number of stress cycles		10*106	10*106	50*106	50*106
Flow contact fatigue failure mode		difference	Peel off	Peel off	Peeling/fracture
magnetic		Have	Have	no	no
Dimensional stability		difference	difference	good	good
Insulation		Not insulated	Not insulated	good	good

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