Abstract
Pyrophyllite granule powders for thermal spray coating were successfully prepared through spray drying process. To produce a stable slurry, commercial pyrophyllite powder of 45μm in size was ball-milled for reduction of the size to 2 ~ 3 ㎛ and a dispersant was added to control the viscosity. Dense and spherical granules (average granule size : 59 ㎛) were prepared under conditions of 12,500 rpm for rotation velocity of the atomizer and 100 cps for slurry viscosity. The granules were then heat treated at 1,200℃ for proper handling strength and flow properties. The final granules had an apparent density of 0.725 g/㎤ and a flow rate of 2.5 g/sec, which represent excellent properties to be used as the granule powder for thermal spray coatings.
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