Tensile stress life model for rolling contact fatigue of silicon nitride ceramic balls

2008 ◽  
Vol 44 (02) ◽  
pp. 37 ◽  
Author(s):  
Jingling ZHOU
Keyword(s):  
Silicon Nitride ◽  
Tensile Stress ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Silicon Nitride Ceramic ◽  
Life Model

scholarly journals Rolling Wear of Silicon Nitride Bearing Materials

1990 ◽  
Author(s):  
John W. Lucek
Keyword(s):  
Fatigue Life ◽  
Silicon Nitride ◽  
Failure Modes ◽  
Fatigue Testing ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Wear Performance ◽  
Wear Rates ◽  
Bearing Materials

Rolling-contact fatigue test methods were used to measure the wear performance of several silicon nitride materials. Sintered, hot pressed and hot isostatically pressed materials exhibited wear rates ranging over three orders of magnitude. Hot isostatically pressed materials had the lowest wear rates. Despite the disparity in wear performance, all materials tested had useful rolling-contact fatigue lives compared to steel. Fatigue life estimates, failure modes, and rolling wear performance for theses ceramics are compared to M-50 steel. This work highlights the rapid contact stress reductions that occur due to conformal wear in rolling-contact fatigue testing. Candidate bearing materials with unacceptably high wear rates may exhibit useful fatigue lives. Rolling contact bearing materials must possess useful wear and fatigue resistance. Proper performance screening of candidate bearing materials must describe the failure mode, wear rate, and the fatigue life. Guidelines for fatigue testing methods are proposed.

Exploring the Potential for the Application of Ceramic Bearing Technology to the Wheel/Rail Interface

2007 ◽  
Author(s):  
Gerald E. Arnold
Keyword(s):  
Silicon Nitride ◽  
Wheel Running ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Future Application ◽  
Wear Rates ◽  
Steel Wheel ◽  
Rolling Elements ◽  
The Right

Ball or roller bearings have much in common with a railway wheel running on a rail. Both have high Hertzian stresses and are subject to rolling contact fatigue. Silicone Nitride (Si3N4), a Technical Ceramic, has now firmly established itself in the engineering marketplace as part of a hybrid bearing, where the rolling elements are silicone nitride and the races are steel. The paper explores the possibility of a Silicon Nitride/steel wheel/rail combination and finds that, because Silicon Nitride has a higher Modulus of Elasticity, it is not suitable as a direct replacement on existing systems, because it would produce a smaller contact patch and greater contact stress. The low toughness of Silicon Nitride in comparison to steel could be an obstacle to its general railway use, however, it could made into a composite material in the same manner as Carbon Reinforced Silicon Carbide (C/SiC) is used in brake discs. There is a possibility that, under the right conditions, Silicon Nitride could return very low wear rates, because of its extreme hardness, and because it’s excellent resistance to rolling contact fatigue (noted in hybrid bearings). This could give a wheel high mileage, without the need to remove fatigued material by controlled wear or by turning. A promising future application for the material is a cable-hauled system, where the predicted lower adhesion between Silicon Nitride and a steel rail is not a problem and the wheels are not required to be conductive.

Rolling Contact Fatigue of Silicon Nitride Balls under Pure Rolling Condition

2009 ◽  
pp. 348-349
Author(s):  
Zhou Jing-ling ◽  
Chen Xiao-yang ◽  
Zhang Pei-zhi ◽  
Wu Guo-qing
Keyword(s):  
Silicon Nitride ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Rolling Condition ◽  
Pure Rolling
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