超声电沉积碳/碳复合材料磷灰石涂层的工艺优化

通过声电沉积在碳/碳复合材料表面制备钙磷生物活性涂层,采用SEM(带EDAX)或FE-SEM,XRD,FTIR研究电解质浓度和初始pH值对钙磷生物活性涂层的形貌、结构和组成的影响,并采用拉伸测试评价涂层与基体的结合力.结果表明:随着电解质浓度的降低,其组成由羟基磷灰石与磷酸三钙组成的混合涂层转变为含碳酸根的羟基磷灰石涂层,n(Ca)/n(P)和碳酸根的含量逐渐增加,片状晶体颗粒减小.随着初始电解液pH值的升高,涂层致密,均为片状含碳酸根的羟基磷灰石,n(Ca)/n(P)呈增加的趋势,片状晶体的厚度在30～40nm之间.涂层拉伸实验表明:小电解质浓度时,其涂层与基体的结合强度(5.62MPa)大于高电解质浓度时涂层与基体的结合强度(3.85MPa).

Optimization of Process Parameters of Calcium Phosphate Coating on C/C Composites by Sonoelectrodeposition Technique

Bioactive calcium phosphate coatings on carbon/carbon composites were prepared by a cathode sonoelectrodepostion technique.The effect of electrolyte concentration and pH of the electrodeposion solution on morphology,structure and composition of coating on carbon/carbon composites were investigated by SEM or FE-SEM, EDAX,FTIR and XRD method,and adhesion of coatings was also measured.The results showed that the plate-like crystals formed in high electrolyte concentration were identified to be Ca3(PO4).2(ACP) and Ca10(PO4)6(OH)2(HA).With the electrolyte concentration increasing,the precipitates formed be identified to be carbonate-containing Ca10(PO4)6(OH)2(HA) only,the carbonate content and n(Ca)/n(P) of coating increased continuously,the size of as-deposite particles decreased.In the experimentation range of pH of the electrodeposion solution,the coating was a dense and plate-like carbonate-containing Ca10(PO4)6(OH)2(HA).With the pH of the electrodeposion solution increasing,thickness of plate-like crystals decreased,a more compact nano-coating can be obtained.The adhesion(5.62MPa) in low electrolyte concentration was greater than that(3.85MPa) in high electrolyte concentration.