The effect of lead zirconate titanate (PZT) powder loading in the slurry on wall thickness of PZT microtubes formed by dip coating on vermicelli of diameters about 500 and 1000 mm has been reported. The vermicelli of 1000 mm diameter withstand longer dipping time (8 min) compared to vermicelli of diameter 500 mm (2 min). The wall thickness of the PZT microtubes formed by dip coating increased with both slurry loading and dipping time. The PZT microtubes by dip coating on vermicelli of 1000 mm diameter have thicker walls than that obtained with vermicelli of diameter y500 mm due to higher water absorption capacity of the former. Microtubes of PZT with wall thickness in the ranges of about 125 to 280 mm and about 220 to 480 mm could be prepared by dip coating of slurries of PZT powder loading in the range of 40?2 to 46?5 vol.-% on vermicelli of diameters 500 and 1000 mm respectively.
PZT microtubes have been fabricated by dip coating of aqueous PZT powder slurry on vermicelli, followed by burnout of the vermicelli and sintering. The water-absorbing character of the vermicelli made a thin layer of PZT slurry to gel on its surface during dip coating. Thickness of the gel on the surface of the vermicelli depends on the dipping time. The green PZT layer thickness in the range of 140-190 lm could be achieved for a dipping time of 30-120 s. Microtubes having an inner diameter of nearly 500 lm with wall thickness in the range of 120-160 lm could be prepared by this process.M. Kuwabara-contributing editor
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