MEF Spotting Technique for Studing Subsurface Damage in Deterministic Microground Polycrytsalline Alumina

Conference · Mon Jan 07 04:00:00 EST 2008 · Optical Manufacturing and Testing VII

OSTI ID:921622

Shafrir, S F ^[1]; Lambropoulos, J C; Jacobs, S D

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1. Laboratory for Laser Energetics, University of Rochester, Rochester, NY

We report on use of the magnetorheological finishing (MRF) spotting technique to estimate subsurface damage (SSD) depth resulting from deterministic microgrinding for polycrystalline alumina (CA). With various microscopy techniques, we show how surface roughness evovles with the amount of material removed by an MRF spot. Two stages are identified. In the first stage the induced damage layer and associated SSD from microgrinding are removed, reaching an optimal value of surface roughness. Here, the initial peak-to-valley (p-v) surface roughness from grinding gives a measure of the SSD depth found by spotting. In the second stage, where more material is removed from the non-rotating surface, the resulting surface roughness begins to show the interaction between MRF abrasive particles and the material's microstructure (crystal grains), i.e., the "MRF signature" for a specific material. We can examine the "MRF signature" across grains using power spectral density and characterize surface features that contribute to surface roughness.

• Research Organization: Laboratory for Laser Energetics, University of Rochester
• Sponsoring Organization: USDOE
• DOE Contract Number: FC52-92SF19460
• OSTI ID: 921622
• Report Number(s): DOE/SF/19460-792; 2007-13; 1764
• Conference Information: Journal Name: Optical Manufacturing and Testing VII Journal Volume: 6671
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABRASIVES
ALUMINIUM OXIDES
DAMAGE
GRINDING
INSPECTION
MICROSTRUCTURE
POLYCRYSTALS
ROUGHNESS
SPECTRAL DENSITY
SURFACE FINISHING
magnetorheological finishing
polycrystalline alumina
subsurface damage
surgace roughness