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Controlled Evolution of Morphology and Microstructure in Laser Interference‐Structured Zirconia
Author(s) -
Daniel Claus,
Armstrong Beth L.,
Howe Jane Y.,
Dahotre Narendra B.
Publication year - 2008
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2008.02449.x
Subject(s) - materials science , microstructure , laser , cubic zirconia , optics , fluence , grain size , pulse duration , wavelength , ridge , nanometre , morphology (biology) , composite material , optoelectronics , ceramic , physics , paleontology , genetics , biology
Tape‐cast pseudo‐cubic zirconia pellets were surface irradiated by two coherent interfering high‐power short‐pulse Nd:YAG laser beams. The interfering beams of the third harmonic with a wavelength of 355 nm of a 2.5‐ns Q‐switched laser produced a line‐like intensity distribution with a periodic distance of 3.3 μm due to the selected angle between the beams. The resulting nonuniform surface heating produced a microstructure consisting of ultrafine‐grained zirconia with a grain size of about 10 nm within the top 100–200 nm depth of the treated surface region due to the high cooling rates during short‐pulse laser processing (up to 10 10 K/s). The surface morphology closely followed the microperiodic heat treatment provided by the interfering laser beams. The pore size distribution within the periodic surface morphology ranged from a few nanometers to a maximum of half of the periodic line distances.