Accession Number:

AD0753027

Title:

Fundamental Research on Machining of Brittle Materials.

Descriptive Note:

Final rept.

Corporate Author:

HONEYWELL INC BLOOMINGTON MINN CORPORATE RESEARCH CENTER

Personal Author(s):

Report Date:

1972-12-01

Pagination or Media Count:

23.0

Abstract:

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

Descriptors:

• *MACHINING
• *CERAMIC MATERIALS
• BRITTLENESS
• SINGLE CRYSTALS
• MAGNESIUM OXIDES
• GRINDING
• FORCE(MECHANICS)
• MAGNETIC PROPERTIES

Subject Categories:

• Ceramics, Refractories and Glass

Distribution Statement:

APPROVED FOR PUBLIC RELEASE