液相等离子喷涂羟基磷灰石涂层性能与工艺的研究

摘要

Objective Through researching the relationship between process and performance of coating,obtaining the optimal technological parameters about preparing hydroxyapatite coating by liquid precursor plasma spraying.Methods The critical technological parameters such as spraying power,transfer speed,spraying distance and atomizing pressure were optimized by orthogonal test and orthogonal analysis was done about the coating thickness and the degree ofcrystallinity.Then the coatings were characterized by XRD,FTIR and SEM.Result XRD analysis showed that the main phase of all coatings was HA,and there were a little TCP phases and CaO; FTIR analysis showed that there were a little CO32-groups in all coatings and some OH groups dropped offin some coatings; SEM observation showed that the No.3 coating deposited as unconsolidated particles,so the bonding strength was very low,the other coatings presented preferable splatting; orthogonal analysis showed that the influence of every factor for the performance of coatings:spraying distance ＞ atomizing pressure ＞ transfer speed ＞ spraying power,and obtained the optimal technological parameters.Conclusions The optimal technological parameters of preparing hydroxyapatite coating by liquid precursor plasma spraying was spraying power (45kw) + transfer speed (8) + spraying distance (10cm) + atomizing pressure (0.14mPa).%目的 通过对液相等离子喷涂羟基磷灰石涂层工艺和涂层理化性能的研究,摸索出最优的液相等离子喷涂工艺参数.方法 采用正交试验的方法对喷涂功率、蠕动泵速(传送速率)、喷涂距离及雾化压力这四个关键的工艺参数进行优化,以涂层厚度和结晶度为考察目标进行正交试验分析,并对涂层进行了X射线衍射、傅立叶转换红外光谱及扫描电镜观察等理化性能表征.结果 XRD分析表明各组样品的主相均为HA相,部分样品含有少量的TCP相和CaO；FTIR分析表明每组样品都含有少量的CO32-基团,部分样品的OH基团发生了脱落；SEM观测表明3#样品呈颗粒状松散堆积,结合强度低,其余样品均呈现出较好的扁平化；正交分析表明各因素对涂层性能的影响大小顺序为:喷涂距离＞雾化压力＞泵速＞功率,并得到了最佳的工艺参数组合.结论 液相等离子喷涂羟基磷灰石涂层的最佳工艺参数组合为:功率(45kw)+泵速(8)+喷涂距离(10cm)+雾化压力(0.14mPa).