| 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 |
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| ABSTRACT |
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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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