ceramic ball silicon nitride ball si3n4 ball zirconia ball zro2 ball silicon carbide ball sic ball aluminum oxide ball al2o3 ball
ceramic roller silicon nitride roller si3n4 roller zirconia roller zro2 roller
ceramic bearing silicon nitride bearing si3n4 bearing zirconia bearing zro2 bearing silicon carbide bearing sic ball aluminum oxide bearing al2o3 bearing full ceramic bearing ceramic ball bearing ceramic roller bearing
hybrid ceramic bearing hybrid ceramic ball bearing hybrid ball bearing hybrid roller bearing ceramic hybrid bearing ceramic hybrid ball bearing

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Home > Engineering Data > Basic Properties Of Materials

Basic Properties of Materials

1. Basic Properties of Ceramic Materials

Item
Unit
Si3N4
ZrO2
SiC
Al2O3
Density G/cm3 3.25 6 3.15 3.95
Thermal expansion coefficient (¦Á) 10-6/K 3.2 10.5 4.5 8.5
Elastic modulus (E) GPa 320 210 400 380
Poisson's ratio   0.26 0.3 0.2 0.22
Hardness Hv Hv 1400-1800 1100-1400 2000-2400 1700-1900
Hardness HRC HRc 75-80 70 85-90 80
Bending strength ¦ÒRT MPa 600-1200 600-900 450-550 300-500
Fracture toughness K1C MPa¡¤m1/2 5.0-7.0 6.0-10.0 3.0-5.0 3.0-4.0
Thermal conductivity ¦Ë W/m¡¤K 35 25 120 30
Specific resistance ¦¸mm2/m 108-1018 105-1015 10-103 108-1018
Max working temperature ¡ãC 800 500 1200 1000
Corrosion resistance   ¡ï¡ï¡ï¡ï ¡ï¡ï¡ï ¡ï¡ï¡ï¡ï¡ï ¡ï¡ï¡ï¡ï
Cycles of stress Cycles 107-109 105 - -
Unlubricating friction   little little little -
Magnetism   None None None None
Centrifugal force   little large little middle
Operating temperature increasing   low Low low Low
Dimensional stability   ¡ï¡ï¡ï¡ï¡ï ¡ï¡ï ¡ï¡ï¡ï¡ï ¡ï¡ï
Conductivity   insulator insulator conductor insulator
Rolling contact failure mode   flaking crushing crushing crushing

2. Basic Properties of Plastic Materials

Item
Unit
Teflon
(PTFE)
PEEK
PA66
POM
PI
Density G/cm3 2.18 1.32 1.14 1.42 1.35
Thermal expansion coefficient (¦Á) 10-6/K 120 50 80 100 49
Tensile strength MPa 25 95 80 70 116
Friction coefficient   0.09 0.34 0.38 0.34 0.34
Softening temperature ¡ãC 327 343 260 175 395
Max. working temp.
(short time)		 ¡ãC 260 300 160 150 350
Max. working temp.
(long time)		 ¡ãC 200 250 100 100 280

 

 
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