一种碳/碳复合材料表面制备高结合强度羟基磷灰石涂层的新方法

A novel method for preparing adherent hydroxyapatite coating on carbon/carbon composite surface

背景:目前在碳/碳表面制备羟基磷灰石涂层的方法有很多种,但所制涂层与基体的结合强度不高。目的:提出一种在碳/碳复合材料表面制备高结合强度羟基磷灰石涂层的新方法。方法:首先利用感应加热法在基体表面制备出无水磷酸氢钙涂层,而后对其进行水热处理,转变为羟基磷灰石相。扫描电镜观察涂层的形貌,划痕法测试涂层的临界载荷,顶出法测试剪切强度。结果与结论:感应热沉积法可以在碳/碳复合材料表面制备出致密的块状晶粒结构的无水磷酸氢钙涂层;通过水热处理可以将其转变成结晶完好致密的羟基磷灰石涂层。涂层的临界载荷为13.31N,剪切强度约为47MPa。

BACKGROUND： At present, there are many methods for preparing hydroxyapatite （HA） coating on carbon/carbon composite surface, but the bonding strength between the prepared coating and the substrate is not high. OBJECTIVE： To propose a novel method for preparing HA coating with high bonding strength on carbon/carbon composite surface. METHODS： Firstly, monetite coating was deposited on carbon/carbon composite using induction heating technique, and then the monetite coating was converted to HA by hydrothermal method in ammonia solution. The morphology of the coating was observed under scanning electron microscopy, the critical load of HA coating was determined using scratch test, and shear strength was detected with extrusion method. RESULTS AND CONCLUSION： Using induction heat deposition method, dense block anhydrous dicalcium phosphate coating with grain structure was prepared in the carbon/carbon composite surface, and then transformed into dense HA coating with good crystals by hydrothermal method. The critical load of HA coating is 13.31 N and shear strength is 47 MPa.