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Preparation of α‐Alumina Platelets by Laser Scanning
Author(s) -
Wu Yiquan,
Choy KwangLeong,
Hench Larry L.
Publication year - 2004
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.1551-2916.2004.01606.x
Subject(s) - materials science , crystallization , scanning electron microscope , coaxial , microstructure , melting point , laser , composite material , laser scanning , chemical engineering , optics , physics , electrical engineering , engineering
A laser scanning with gas jet process was developed to prepare alumina platelets from an alumina powder. When the carbon‐dioxide laser scanned the alumina powdery coatings prepared using an electrospraying technique, the alumina particles were heated to a melting state. The coaxial gas ejection force pushed the melting particles to obtain tabular shape grains that recrystallized into alumina platelets in the subsequent rapid‐cool solidification. The phase and morphologies of powder bed were characterized by XRD and SEM. Results show that only α‐alumina platelets were formed in the scanning process and the average edge length and thickness is 10 μm and 1–2 μm, respectively. Laser processing parameters such as laser energy density, scanning speed, and gas pressure were expected to play a vital role in the melting‐crystallization‐solidification process for obtaining platelike grains from powder beds. The preliminary experiment showed that the laser‐scanning technique could be an effective means of tailoring the morphologies of particles to meet application requirements.