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J. Korean Ceram. Soc. > Volume 41(3); 2004 > Article
Journal of the Korean Ceramic Society 2004;41(3): 259.
doi: https://doi.org/10.4191/kcers.2004.41.3.259
플라즈마 용사법에 의한 Hydroxyapatite코팅층의 제조와 미세구조
이치우, 오익현1, 이형근2, 이병택
공주대학교 신소재공학부
1공주대학교 신소재공학
2한밭대학교 재료공학
Fabrication and Microstructure of Hydroxyapatite Coating Layer by Plasma Spraying
The microstructure of nano-sized hydroxyapatite (HAp) powders coating layer on ZrO$_2$ substrate was investigated, which was formed by plasma spray process. The nano-sized HAp powders were successfully synthesized by precipitation of Ca(NO$_3$)$_2$$.$4H$_2$O and (NH$_4$)$_2$HPO$_4$ solution. The HAp coating layer with thickness of 150∼250 $mutextrm{m}$ was free from the cracks at interfaces between the coating and ZrO$_2$ substrate. In the plasma sprayed HAp coating layer, the undesirable phases were not found, while in the HAp coating layer heat-treated at 800$^{circ}C$, TTCP, and ${beta}$-TCP phase were detected as well as HAp phase. However, at 900$^{circ}C$, they were completely disappeared. At 1100$^{circ}C$, XRD analysis revealed that the coating layer was composed of the highly crystallized HAp.
Key words: Plasma spray, Hydroxyapatite, Microstructures, Crystallization, Ca/P ratio
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