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Comparison Of Bearing Material Technical Data 1 >>

Bearings

Comparison Of Bearing Material Technical Data

Technical data	Unit	GCr15	9Cr18	Si3N4	ZrO2
ρ Density	g/cm3	7.8	7.9	3.2	6
α Coefficient of expansion	10-6/℃	11	17	3.2	10.5
E modulus of elastIcity	GPa	208	200	320	210
µ Poisson ratio		0.3	0.3	0.26	0.3
HV Hardness		800	700	1700	1300
σb Flexural strength	Mpa	2400	2600	900	1000
Compressive strength	Mpa			3500	2000
Kc Impact strength	Nm/cm2	20	25	7	11
λ Thermal conductivity	W/mk	30-40	15	3.5	2.5
Ω specific resistivity	mm2/m	1	0.75	1018	1015
specific heat	J/KgK	450	450	800	400
MAX permissible service temperature	℃	120	150	1000	800
anti-corrossion		none	weak	strong	strong
NO.of stress circle(50% destroy)		10*106	10*106	50*106	50*106
Destroy model		peel off	peel off	peel off	peel off/break
Anti-magnetism		none	none	good	good
Dimension stability		not good	not good	good	good
Insulate properties		not good	not good	good	good

Truck and Trailer Parts

New Products

Basic Properties Of Staple Engineer Plastic

Material	HDPE	PP	POM	PA 6	PA 66	PBT GF30	PVDF	PPS	PTEE	PEEK	PI
℃ Long-time working temp.	90	100	110	100	100	120	150	230	260	260	300
(G/cm3 )ρ Density	0.96	0.91	1.42	1.13	1.14	1.53	1.77	1.35	2.18	1.32	1.35
(Mpa) σs Tensile strength at yield	25	30	70	85	80		50	75	25	95
(Mpa) σR Tensile strength at break	35	None	None			13.5	4.6				116
(Mpa)Hk Ball indentation harden	50	80	170	160	170	190	80	190	30
(K J/m2) an Impact strength	None	None	None	None	None	60	None	50	None	None	75
Coef. Of fliding frication	0.29	0.3	0.34	0.38-0.45	0.35-0.42	0.24	0.3		0.08-0.1	0.3-0.38	0.3-0.38
(µ/km) Slide wear		11	4.6	0.23	0.9				21		0.3-0.38
(℃) Vicat softening temp.	130	165	175	220	260	225	170	280	327	343
(℃) DSC/T g	-95	-18	-60	60	72	60	-18	90	-20	143
(℃) Heat deflection temp. HDT/A	42-49	65	124	75	100	210	95	110	55	140	368
(℃) Heat deflection temp. HDT/B	70-85	105	170	190	﹥200	225	140		121	182
(℃) Max working temp. short time	90	140	150	160	170	200	150	260	260	300	350
(10ˉ5/K) Coef. Of linear expansion	13-15	17	10	8	8	3.5	13	5	12	5.0	4.9
(106Hz) Dielectric constant at 1 Mhz	2.4	2.25	3.7	3.7-7	3.6-5	3.8	8		2.1	3.2-3.3	3.1
(Ω·cm) Volume resistivity	﹥1015	﹥1014	﹥1014	10¹⁴	10¹²	﹥1013	10¹⁴	10¹³	﹥1016	10¹⁶	10¹⁷
Anti-hot water and alkali for washing	+	+	-	(+)	(+)	-	+	+	+	+	(+)
Flammability UL94	HB	HB	HB	HB	HB	HB	V0	V0	V0	V0	V0
Anti-weathering	-	-	-	-	-	-	+	-	+	-	(+)

+ = resistant (+) = partly resistant - = non-resistant none = no break