Abstract
Surface flaws are introduced during grinding of most high strength ceramics. These flaws reduce the strength and it is therefore important to choose grinding parameters such that surface damage is minimized. The assumption that it is the same mechanism that causes cracking beneath both an indenter and a diamond tool made it possible to propose a grinding model. According to this model high wheel speeds, low workpiece velocities and low depths of cut would reduce the grinding forces and thus be beneficial to the strength after grinding. Grinding experiments on hot isostatically pressed silicon nitride showed that this was the case. The experiments also showed that the grinding direction had the strongest influence on the strength, and if possible the direction ought to be parallel with the expected principal stress. Even what can be considered to be mild machine parameters introduce flaws and residual compressive stresses in the surface of the workpiece.
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Hakulinen, M. Residual strength of ground hot isostatically pressed silicon nitride. J Mater Sci 20, 1049–1060 (1985). https://doi.org/10.1007/BF00585749
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DOI: https://doi.org/10.1007/BF00585749