Yang Yunzhi, Kim Kyo-Han, Mauli Agrawal C, Ong Joo L
Health Science Center at San Antonio, Department of Restorative Dentistry, The University of Texas, MSC 7890, 7703 Floyd Curl Drive, San Antonio, TX 78229-3900, USA.
Biomaterials. 2003 Dec;24(28):5131-7. doi: 10.1016/s0142-9612(03)00459-9.
In this study, radiofrequency sputtered calcium phosphate (CaP) coatings were evaluated after 1h post-deposition heat treatment at either 350 degrees C, 400 degrees C, 450 degrees C, 500 degrees C or 600 degrees C in the presence or absence of water vapor. X-ray diffraction analyses indicated the as-sputtered coatings to be amorphous. With different post-deposition heat treatments used, in this study, crystallinity of CaP coatings was observed to be in the range of 0-68%. The 400 degrees C and 450 degrees C heat-treated CaP coatings in the absence of water vapor were poorly crystalline, exhibiting a crystallinity of 2+/-1%. In comparison to heat treatments at 450 degrees C in the absence of water vapor, the presence of water vapor at 450 degrees C heat treatment resulted in a significant increase in coating crystallinity. However, this effect was not observed at higher temperatures. A coating crystallinity of 60-68% was observed for coatings heat treated at 450 degrees C in the presence of water vapor, and at 500 degrees C and 600 degrees C in the presence or absence of water vapor. In addition, increases in the degree of coating crystallinity were observed to be consistent with the increasing number of PO(4) peaks observed as a result of different post-deposition heat treatments. It was concluded that the presence of water vapor at 450 degrees C post-deposition heat treatment significantly affect the crystallinity of CaP coatings, whereas an increase to temperature higher than 450 degrees C and in the presence of water vapor has no significant effect on crystallinity.
在本研究中，对射频溅射磷酸钙（CaP）涂层在350℃、400℃、450℃、500℃或600℃下进行1小时沉积后热处理，且分别在有水蒸气和无水蒸气的条件下进行评估。X射线衍射分析表明，溅射态涂层为非晶态。在本研究中，采用不同的沉积后热处理方法，观察到CaP涂层的结晶度在0 - 68%范围内。在无水蒸气条件下，400℃和450℃热处理的CaP涂层结晶性较差，结晶度为2±%。与450℃无水蒸气热处理相比，450℃热处理时存在水蒸气会导致涂层结晶度显著增加。然而，在更高温度下未观察到这种效应。在450℃有水蒸气热处理的涂层，以及在500℃和600℃有水蒸气或无水蒸气热处理的涂层，观察到涂层结晶度为60 - 68%。此外，观察到涂层结晶度的增加与不同沉积后热处理导致的PO(4)峰数量增加一致。得出的结论是，450℃沉积后热处理时水蒸气的存在显著影响CaP涂层的结晶度，而温度升高到高于450℃且有水蒸气存在时对结晶度无显著影响。
