M00001425
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ISO 14627 1st Edition, July 15, 2012 Fine ceramics (advanced ceramics, advanced technical ceramics) - Test method for fracture resistance of silicon nitride materials for rolling bearing balls at room temperature by indentation fracture (IF) method
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Availability date: 07/13/2021
Description / Abstract:
This International Standard describes a test method that covers
the determination of fracture resistance of silicon nitride bearing
balls at room temperature by the indentation fracture (IF) method,
as specified in ISO 26602.
This International Standard is intended for use with monolithic
silicon nitride ceramics for bearing balls. It does not include
other ceramic materials.
This International Standard is for material comparison and
quality assurance.
Indentation fracture resistance, KI, IFR as
defined in this International Standard is not to be equated to
fracture toughness determined using other test methods such as
KIsc and KIpb.
NOTE KI, IFR is an estimate of a material's
resistance to cracking as introduced by an indenter and has
correlations with wear resistance and rolling contact fatigue
performance as well as machining processes used for silicon nitride
materials since these properties are governed by the resistance to
crack extension in localized damage areas. By contrast, fracture
toughness, KIsc and KIpb are intrinsic
properties of a material and are relevant to macroscopic and
catastrophic fracture events with long cracks, rather than those
phenomena caused by microscopic and successive damage accumulation
associated with short cracks.