HIGH VELOCITY SUSPENSION FLAME SPRAYING OF NANO-STRUCTURED MATERIALS AND RELATED INDUSTRIAL APPLICATIONS

摘要

Thermal Spraying of fine structured powder materials requires the application of agglomerated powders that can be processed using APS (Atmospheric Plasma Spraying) or HVOF (High Velocity Oxy Fuel Flame Spraying) spray processes. Alternatively the powder can be converted into a finely dispersed suspension together with an organic solvent, appropriate for suspension spraying (f. i. SPS: Suspension Plasma Spraying or HVSFS: High Velocity Suspension Flame Spraying). Both methods are suitable to manufacture finely structured coatings and offer new possibilities in functional coating development for new application fields. Due to their refined microstructure, mechanical and physical coating properties can differ significantly from their conventionally sprayed counterparts. HVSFS is preferably chosen if dense coatings need to be fabricated. The paper will give an overview about current suspension spray development activities using an in-house developed supersonic flame spray system and will present some industrial application examples.