炭/炭复合材料声电沉积钙磷生物活性涂层的生长机理

Growth Mechanism of the Calcium Phosphate Coatings on C/C Composites by Sonoelectrodeposition Technique

摘要:

通过声电沉积在炭/炭复合材料表面制备钙磷生物活性涂层,采用SEM（带EDAX）,XDR,FTIR研究电沉积时间对钙磷生物活性涂层的形貌、结构和组成的影响.实验结果表明：沉积初始先在炭/炭表面形成无定形层,片状磷酸氢钙（DCPD）在其表面生长,随着电沉积时间的延长,逐渐向针状的羟基磷灰石Ca10（PO4）6（OH）2（HA）转变,涂层厚度和n（Ca）/n（P）不断增加,涂层的结晶度和电解液的pH值下降.涂层为缺钙磷灰石.同时探讨了在炭/炭复合材料表面钙磷生物活性涂层的生长机理.

Abstract:

Bioactive calcium phosphate coatings on carbon/carbon composites were prepared by a cathode sonoelectrodepostion technique. The effects of electrodeposition time on the morphology, structure and composition of the coatings on carbon/carbon composites were investigated by SEM, EDAX, FTIR and XRD. The experimental results show that the plate-like crystals formed in initial stages of electrodeposition were identified to be CaHPO4.2H2O(DCPD). With the electrodeposition time elapsing, the formed needle-like precipitates were identified to be Ca10(PO4)6(OH)2(HA), the coating thickness and the n(Ca)/n(P) ratio increased continuously. The degree of crystallization of the coatings and the pH values of electrolyte decreased with the electrodeposition time increasing. The coatings were calcium-deficient apatite. In addition, the growth mechanism of coatings on C/C composites was also discussed.