Surface defects generated by grinding deteriorate the flexural strength of the silicon nitride ceramic. In this paper, laser surface processing was applied to eliminate the grinding-induced defects. SEM micrograph showed that the surface integrity of samples was improved after laser processing. Four-point bending tests and fractographic analysis indicated that the flexural strength and fracture origins were affected by the change of surface integrity in laser-treated samples. The effect of grinding-induced residual stress on flexural strength of laser-treated samples was discussed. It was concluded that laser surface processing had significant effects on fracture behavior of flexure samples.
Issue Section:
Research Papers
Keywords:
silicon compounds,
ceramics,
laser materials processing,
laser beam effects,
fracture,
grinding,
bending strength,
surface structure,
bending,
fractography,
materials testing,
mechanical testing,
internal stresses,
surface treatment,
laser surface processing,
silicon nitride,
surface integrity,
flexural strength,
fracture origin
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