Ultrafine ZrO2 powder by Laser Evaporation: Preparation and properties

✍ Scribed by G. Michel; E. Müller; Ch. Oestreich; G. Staupendahl; K. H. Henneberg

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 515 KB
• Volume: 27
• Category: Article
• ISSN: 0933-5137
• DOI: 10.1002/mawe.19960270710

✦ Synopsis

Abstract

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.