Investigation of Electrostatic Atomization and Its Application for the Synthesis of Fine Ceramic Powder

摘要

In the present study,electrostatic atomization (EA)behavior of several test liquids having much higher viscosities( 1 400 mPa· s)than have previously been studied was investigated by spraying at a series of applied voltages and flow rates.The results showed that to obtain stable cone-jet mode spraying and hence gain better monodispersity of droplets,electrical conductivity,viscosity and surface tension of the liquid are important controlling factors.The stable cone-jet mode could be easily established for liquids having shear viscosities in the range from 80 to 1 400 mPa· s and surface tensions below 65 mN·m-1.In contrast,methylcellulose aqueous solutions with shear viscosities ranging from 10 to 540 mPa· s and moderate surface tensions(50 ～ 56 mN· m-1)generated more complicated spraying modes.However,fine TiO2 powder( a few micrometers in size)could be prepared using the EA method from its precursor solutions.