Chromium coatings by HVOF thermal spraying: Simulation and practical results

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:160444

Knotek, O; Lugscheider, E; Jokiel, P; Schnaut, U; Wiemers, A ^[1]

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1. Materials Science Inst., Aachen (Germany)

Within recent years High Velocity Oxygen-Fuel (HVOF) thermal spraying has been considered an asset to the family of thermal spraying processes. Especially for spray materials with melting points below 3,000 K it has proven successful, since it shows advantages when compared to coating processes that produce similar qualities. In order to enlarge the fields of thermal spraying applications into regions with rather low thickness, e.g. about 50--100 {micro}m, especially HVOF thermally sprayed coatings seem to be advantageous. The usual evaluation of optimized spraying parameters, including spray distance, traverse speed, gas flow rates etc. is, however, based on numerous and extensive experiments laid out by trial-and-error or statistical experimental design and thus being expensive: man-power and material is required, spray systems are occupied for experimental works and the optimal solution is questioned, for instance, when a new powder fraction or nozzle is used. In this paper the possibility of reducing such experimental efforts by using modeling and simulation is exemplified for producing thin chromium coatings with a CDS{trademark}-HVOF system. The aim is the production of thermally sprayed chromium coatings competing with galvanic hard chromium platings, which are applied to reduce friction and corrosion but are environmentally disadvantageous during their production.

• OSTI ID: 160444
• Report Number(s): CONF-940684--; ISBN 0-87170-509-5
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHROMIUM
CORROSION RESISTANCE
CURRENT DENSITY
ELECTRIC POTENTIAL
FLAME SPRAYING
MICROHARDNESS
MICROSTRUCTURE
PHOTOMICROGRAPHY
POROSITY
POWDERS
VELOCITY
WEAR RESISTANCE