CRYSTALLOGRAPHIC CHANGES IN CALCIUM PHOSPHATES DURING PLASMA-SPRAYING
CRYSTALLOGRAPHIC CHANGES IN CALCIUM PHOSPHATES DURING PLASMA-SPRAYING
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DOI：
10.1016/0142-9612(92)90055-s
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发表时间：
1992-01-01
期刊：
影响因子：
14
通讯作者：
FEATHERSTONE, JDB
中科院分区：
文献类型：
--
作者：
ELLIES, LG;NELSON, DGA;FEATHERSTONE, JDB
利用等离子喷涂技术在金属植入体表面涂覆羟基磷灰石(HA)作为改善块体陶瓷力学性能的一种手段，已经在几个实验室进行了研究。本研究描述了在等离子喷涂磷酸钙粉末过程中可能发生的结晶学变化。在不同温度下，利用几种氢气流动条件，在Ar等离子体中，分别在金属衬底上喷涂了析出的缺钙磷灰石和高温近化学计量比的HA。用X射线衍射仪和扫描电子显微镜对其表面进行了分析。经鉴定，等离子喷涂产品是一种磷酸钙混合物，包括HA、β-磷酸三钙(β-TCP)和氧化钙。当等离子喷涂时，化学计量比HA的降解率最小(5%)。由于β-磷酸三钙在体内比羟基磷灰石更易吸收，改变等离子喷涂表面HA/β-磷酸三钙的比例可以提供一种控制涂层表面溶解的方法。
Coating hydroxyapatite (HA) onto metal implant surfaces using the plasma-spraying technique has been investigated in several laboratories as a means of improving the mechanical properties of the bulk ceramic. This study describes crystallographic changes which can occur during the plasma-spraying of calcium phosphate powders. A precipitated calcium-deficient apatite and a high temperature near-stoichiometric HA were each sprayed onto metal substrates in an argon plasma using several hydrogen gas flow conditions at various temperatures. The surfaces were examined by X-ray diffraction and scanning electron microscopy. The plasma-sprayed products were identified as a mixture of calcium phosphates including HA, beta-tricalcium phosphate (beta-TCP) and calcium oxide. Stoichiometric HA when plasma-sprayed showed the least (5%) degradation. Since beta-TCP is more resorbable than HA in vivo, varying the HA/beta-TCP ratio on the plasma-sprayed surface may provide a method to control surface dissolution of the coating.