Preparation of Zirconia-Coated NiO Powder and its Microstructure

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J. Korean Ceram. Soc. > Volume 35(7); 1998 > Article

Journal of the Korean Ceramic Society 1998;35(7): 653.

$ZrO_2$를 피복한 NiO 분말의 제조 및 미세구조

문지웅, 이홍림, 김구대¹, 김재동, 이동아¹, 이해원¹

연세대학교 세라믹공학과
¹한국과학기술연구원 세라믹공정연구센터

Preparation of Zirconia-Coated NiO Powder and its Microstructure

ABSTRACT

Zirconia coated NiO powders were prepared by the thermal hydrolysis of $Zro(NO_3)_2$.$6H_2O$ in a mixed solvent of alcohol and water. Amorphous zirconium hydroxide was uniformly coated on the surface of NiO powder with the thickness of 20nm. The $ZrO_2$ coating layer was crystallized to tetragonal $ZrO_2$ with the size of 40-60nm at $900^{circ}C$. The coated NiO powder containing 15 vol% $ZrO_2$ was found to have a similar isoelectric point to that of the $ZrO_2$ The grain growth inhibition effect of the coated powders was superior to the mechanically mixed powders.

Key words: Cpated-powder, NiO, Grain growth inhibition, Surface coating