Abstract No.:
5395

 Scheduled at:
Wednesday, June 07, 2017, Hall 28 2:00 PM
Equipment / Consumables & Powders, Wires, Suspensions I


 Title:
Ultrafine powder feeding in thermal spray application

 Authors:
Sylvain Desaulniers* / Polycontrols, Canada

 Abstract:
The cold spray process as well as thermal spray process (HVOF, plasma-spray) require increasing use of fine powders. Existing conventional volumetric powder feeders are ill-suited for this purpose and have limitations in terms of operating pressure and clogging problem.

This paper presents a novel and autonomous powder feeder operating on the principle of a fluidized bed in order to allow a continuous and uniform feeding of submicron powders that were not usually feedable with conventional volumetric/wheel type powder feeders. Primarily designed to produce cold-sprayed coatings, this feeder can also be used in high velocity oxy-fuel (HVOF) spray processes and plasma spray applications to significantly increase productivity by direct injection of submicron particles without requiring suspensions.

This paper presents coating micrographs of Copper, Nickel, Zinc, Aluminium, Aluminium Alloys and WC-Co powders with median particle size from 55 ým to 6 ým produced via cold spraying. This paper also details the coating micrographs of suspension plasma spray (SPS)-like ZrO2-Y2O3 (YSZ) coatings engineered to be employed as thermal barrier coatings (TBCs) in turbines obtained with commercial plasma spray system without the need for suspensions.

A brief overview of Thermal spray and Cold spray applications of Polycontrols will also be addressed.


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