Plasma sprayed and laser engraved field electron emitters

Plasma sprayed Cr 2O 3 coatings were engraved with the use of a CO 2 c.w. laser in an installation for production of anilox rolls. The engraved cells had a ‘honeycomb’ geometry with different line densities and depths: 140 lines/cm with 35-μm depth, 180 lines/cm and 200 lines/cm, both 10 μm deep. Th...

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Bibliographic Details
Published in:Surface & coatings technology 2003-02, Vol.165 (2), p.211-215
Main Authors: Znamirowski, Z., Czarczynski, W., Le Maguer, A., Pawlowski, L.
Format: Article
Language:English
Subjects:
Applied sciences
Cr 2O 3 coatings
Exact sciences and technology
Field emission surfaces
Laser engraving
Metals. Metallurgy
Other surface treatments
Plasma spraying
Production techniques
Surface treatment
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Summary:Plasma sprayed Cr 2O 3 coatings were engraved with the use of a CO 2 c.w. laser in an installation for production of anilox rolls. The engraved cells had a ‘honeycomb’ geometry with different line densities and depths: 140 lines/cm with 35-μm depth, 180 lines/cm and 200 lines/cm, both 10 μm deep. The engraved surfaces were subsequently PVD coated with a Ti thin film. The microstructure of the coatings was characterized using scanning electron microscopy and optical microscopy. Finally, the measurements of the field emission current were carried out. It was found out that the greatest current was emitted from the surface engraved with the 34-μm deep cells. The emissions spots were presumably small, micrometer sized crystals generated at the solidification of laser molten Cr 2O 3.
ISSN:0257-8972
1879-3347
DOI:10.1016/S0257-8972(02)00765-X