METHOD OF PREPARING YTTRIA STABILIZED ZIRCONIA (YSZ) NANOSOL HAVING EXCELLENT DISPERSIBILITY

摘要

The present invention relates to a method of preparing a yttria stabilized zirconia nanosol having excellent dispersibility, the method comprising the steps of: (a) mixing a ZrOCl₂·8H₂O sol and a Y(NO₃)₃·6H₂O sol and adding a basic material thereto to regulate the pH thereof; (b) subjecting the sol obtained in step (a) to a hydrothermal reaction to prepare yttria stabilized zirconia (YSZ) nanoparticles; and (c) conducting a treatment for improving the dispersibility of a nanosol with the YSZ nano particles dispersed therein. According to the present invention, a YSZ sol with excellent dispersability can be produced by adding various silane coupling agents, acids/bases, polymers, and surfactants to nanosized YSZ synthesized via a hydrothermal reaction, and as such, by resolving the coagulation issue indicated as a problem in applications of nanosized YSZ, the nanosized YSZ sol thus prepared can achieve further excellent properties when applied as a heat-shielding coating material and the like.