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On the Nature of Machining Cracks in Ground Ceramics: Part I: SRBSN Strengths and Fractographic Analysis

Published

Author(s)

George D. Quinn, L K. Ives, S Jahanmir

Abstract

Machining cracks in ground sintered reaction-bonded silicon nitride (SRBSN) rods and bars were analyzed by fractographic techniques. Grinding flaw sizes were as small as 12 Jim and as large as 80 Jim and correlated strongly with grinding direction and wheel grit size. Some grinding treatments had nodeleterious effect on strength since the machining cracks were very small and fracture occurred from the material's inherent flaws. The tell tale signs of machining damage may be detected with conventionallow power optical microscopy using simple fractographic techniques. The tell tale signs are summarized in a new series of schematic drawings which will aid pattern recognition for engineers and fractographers. Copious illustrations of machining cracks are provided.
Citation
DOE EMF Engineering Review Symposium
Volume
9

Keywords

fractography, machining cracks, machining flaws fracture origins surface, silicon nitride

Citation

Quinn, G. , Ives, L. and Jahanmir, S. (2003), On the Nature of Machining Cracks in Ground Ceramics: Part I: SRBSN Strengths and Fractographic Analysis, DOE EMF Engineering Review Symposium (Accessed April 21, 2024)
Created May 19, 2003, Updated February 19, 2017