碳/碳复合材料表面声电沉积/碱热处理复合工艺制备羟基磷灰石生物活性涂层研究

通过碱热处理工艺对碳/碳复合材料表面阴极声电沉积的磷酸钙生物陶瓷涂层进行处理,使其转变为磷灰石涂层,采用SEM,EDAX,FTIR,XRD等研究了涂层组成、结构和形貌的变化,并采用拉伸测试评价了涂层与基体的结合力,用SEM观察了涂层的断口形貌.结果表明：用声电沉积技术获得的片状透钙磷石涂层经碱热处理后而得到磷灰石涂层,涂层与基体形成了化学键合,且结合紧密,涂层的形貌没有显著变化,但涂层的致密度有所增加;拉伸测试表明涂层与基体的结合强度最大可达4.2 MPa 以上,涂层的失效部位主要在涂层内部,其失效方式为涂层的内聚破坏和界面脱粘.

Bioactive Hydroxypatite Coating on Carbon/Carbon Composite Prepared by Sonoelectrodeposition and Alkaline-Heat Treatment

To obtain a better bioactive apatite coating, a brushite coating on the carbon/carbon composite prepared by sonoelectrodeposition technique was treated for 1 hour in an alkaline solution. The morphologies, structures and compositions of the calcium phosphate coatings were analyzed with SEM, XRD, FTIR and EDAX, and the bonding strength of coatings was also measured. The results show that the difference in the morphologies of the calcium phosphate coatings is no significant before and after the alkaline-heat treatment, however, a more compact coating can be obtained after the alkaline-heat treatment. The vertical distributions of different elements such as P, O, Ca and C were found between the coating and substrate. The bonding strength is more than 3 MPa, maximum to 4.2 MPa. Failure of the coating mainly occurred inside the coating due to the cohesive breakage of apatite coating.