采用等离子喷涂技术，在钛合金基体表面制备羟基磷灰石涂层．使用ＸＲＤ和ＳＥＭ等测试手段，对获得的涂层进行了表征．结果表明，等离子喷涂过程中，同时发生羟基磷灰石的非晶化与热分解现象．热分解产物为ＣａＯ及α－Ｃａ３（ＰＯ４）２．非晶化是高温羟基磷灰石液滴急剧冷却的结果．羟基磷灰石材料的热力学不稳定性，是发生热分解的主要原因．等离子喷涂获得具有一定粗糙度的羟基磷灰石涂层．涂层的显微结构中；存在气孔以及微裂纹．它们是等离子喷涂工艺的显微结构特征．羟基磷灰石涂层内部存在着烧结现象．涂层与金属基体之间的热传递性能变差，是导致烧结的主要原因．
In the experiment, hydroxyapatite coatings were obtained by using vacuum plasma spraying system. XRD and SEM were used to estimate the as
received coating. The results indicated that, both amorphorization and thermal decomposition of hydroxyapatite took place in the process
of plasma spraying. Amorphous phase was formed due to rapid cooling of the melted hydroxyapatite droplet. The thermal instability of hydroxyapatite
at temperature 1300～1400℃ caused a decomposition of HA powder into CaO and TCP. A rough-surfaced coating was obtained by plasma spraying. Pores and
microcracks were observed as the characteristics of as received coating. A sintering process between the splats occurred in the process, which
was caused by the degradation of thermal exchange property between coating and titanium substrate.
参考文献
| [1] | LeGeros R Z. Adv. Dent. Res. 1988, 2: 164--183. [2] Suchanck W, Yoshimura M. J. Mater. Res., 1998, 13 (1): 94--117. [3] Akao M, Aoki H, Kasto K. J. Mater. Sci., 1981, 16: 809--812. [4] Ohmori A. Thermal Spraying-Current Status and Future Trends, Proceeding of ITSC, Kobe, Japan, Welding Research Institute of Osaka University, 1995. 67--72. [5] Ohmori A. Thermal Spraying-Current Status and Future Trends, Proceeding of ITSC, Kobe, Japan, Welding Research Institute of Osaka University, 1995. 47--52. [6] Ohmori A. Thermal Spraying-Current Status and Future Trends, Proceeding of ITSC, Kobe, Japan, Welding Research Institute of Osaka University, 1995. 37--42. |
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