Fundamental Research on Machining of Brittle Materials.
HONEYWELL INC BLOOMINGTON MINN CORPORATE RESEARCH CENTER
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The report reviews the nature of the surface produced by semi-finish ceramic machining operations. The depth of plastic deformation in single crystals is a function of their hardness. The relative extent of plastic burnishing and brittle fracture in polycrystalline ceramics is a function of their hardness, microstructure and input strength. Direct measurements of grinding forces shows a correlation with the fracture toughness parameters. The consequences of ceramic machining on physical properties, particularly magnetic properties, is reviewed. The deterioration in performance due to ceramic machining is related to the thickness of the sample. All magnetic properties are restored athermally by annealing. These observations are interpreted in terms of stress gradients due to plastic flow at the surface and stress induced phase changes. Author
- Ceramics, Refractories and Glass