Abstract

Focused ion-beam machining (FIBM), a precise form of micro-machining, was tested for feasibility in the manufacturing of microscopic dimples in zirconia-toughened alumina (ZTA), a wear resistant ceramic used in artificial joint replacements. The interaction between the ion-beam and the ceramic was characterized in terms of material removal rate (MRR), surface roughness, and notable irregularities (e.g. pitting, steps at vertical faces). These characteristics were used to design and machine patterns of microscopic dimples for tribological testing. The dimple size and pattern area were limited due to a slow MRR and high cost of milling. No significant difference in the coefficient of friction were found between patterned and non-patterned samples, likely due to the limitations of the pattern. This result suggests FIBM is not suitable for the manufacture of these dimples for commercial or research purposes.

Degree

College and Department

Ira A. Fulton College of Engineering; Manufacturing Engineering

Rights

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