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The variables considered in the experimental design were fluidization air flow rate, drying air temperature, spraying pressure and binder flow rate.
The highest microhardness value of 2296 HV50 was found for the carbide plus carbo-nitride phase contained in the specimens produced at 1200 mbar spraying pressure, 120-mm spraying distance and substrate heating at 600°C.
The microhardness increased from 900 to over 1500 HV by increasing the spraying pressure over the atmospheric one.
The statistical analysis performed with Statgraphics® Centurion version XVI software indicated that the best operating conditions were found for low fluidization air flow rate, high drying air temperature, high spraying pressure and high binder flow rate.
However, for the same spraying pressure and distance, cooling the substrate resulted in an increase in the wear volume of nearly 1125% when compared to the coating produced with optimum conditions.
This requires higher spraying pressure to obtain the desired spray pattern inside the cylinder.
Similar(54)
The results show that a fluidization air flow rate of 100 m3/h, spray pressure of 4 bar, inlet temperature of 60 °C, maltodextrin concentration of 30% and hydroxyethylcellulose concentration of 0.1% led to higher flowability and, a lower dissolution time, moisture content and CO2 release.
It was sprayed (pressure 10 psi) drop wise in to the mixture of ammonium hydroxide (4.25 wt% for 90 nm silica particles, 37.64 wt% for 1 μm silica particles in ethanol).
Spray pressure at the nozzle was 276 kPa and the tractor travelled at a ground speed of 9.7km/h.
The spraying air pressure, the cylinder rotation speed, and the cylinder spray nozzle distance were tailored in such a manner that the roughness of the obtained free films was similar to that from reference coated particles.
If you tell the machine, 'I want hotter water,' or 'I want stronger spray pressure,' the machine will automatically respond".
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