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Ultrafine ZrO 2 powder by Laser Evaporation: Preparation and properties
Author(s) -
Michel G.,
Müller E.,
Oestreich Ch.,
Staupendahl G.,
Henneberg K. H.
Publication year - 1996
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.19960270710
Subject(s) - materials science , vaporization , evaporation , laser , cubic zirconia , tetragonal crystal system , analytical chemistry (journal) , intensity (physics) , laser power scaling , phase (matter) , composite material , optics , chemistry , ceramic , thermodynamics , physics , organic chemistry , chromatography
Ultrafine oxide powders were produced by CO 2 laser evaporation of coarse ZrO 2 powder or compact stabilized ZrO 2 material The 10.6μm radiation in the power range 1–4kW was generated by a transversal flow Co 2 laser which can oscillate in cw and pw operation The vaporization rate depends on the relative position of the focal plane to the surface of the ZrO 2 powder, the laser intensity and the supplied energy input. At a laser intensity of 4.2 · 10 5 Wcm −2 the optimum vaporization rate is 130 g · h −1 (cw‐operation of the laser). The produced powders consist of spherical particles; their diameters vary in the range from 5 to 200 nm can be controlled by the process conditions. The surface area (BET) is adjustable from 10 to 30 m 2 · g −1 . The powders of unstabilized zirconia show an unusual high content of the tetragonal phase. In case of chemically stabilized zirconia the composition can change during the process of evaporation and recondensation.