珍珠粉结构与电泳沉积珍珠粉生物涂层的研究资料.pdf

浙江大学硕士学位论文珍珠粉结构与电泳沉积珍珠粉生物涂层的研究姓名:周海方申请学位级别:硕士专业:材料学指导教师:王小祥 20060201 浙江大学硕士学位论文摘要摘要珍珠质是由片状文石(碳酸钙)与有机质层状交叠的一种生物矿物,并具有成骨活性与生物相容性。本文中对珍珠粉的结构,钛基体上电泳沉积珍珠粉生物活性涂层等进行了研究。文中首先研究了片状珍珠粉的制各工艺,分析了贝壳珍珠层与珍珠粉的结构。利用NaCl0的强氧化作用,破坏珍珠质层片间的有机质,在超声波振荡作用下,使得大颗粒珍珠粉分离从而得到片状的珍珠粉。利用x射线衍射法对贝壳的珍珠层以及不同颗粒度的珍珠粉进行了分析。珍珠层以及粗珍珠粉完全由文石组成。在贝壳珍珠层中有明显的(002)晶面择优取向。商业细珍珠粉以及超细珍珠粉是由文石与少量的方解石组成。其次,研究了在钛基体上电泳法制备珍珠粉生物涂层的工艺。利用无水乙醇作为溶剂,比较了冰乙酸、氯化钙这两种添加剂对悬浮液以及沉积过程的影响。在两种悬浮液中,调节沉积电压、沉积时间等参数均可以在钛板以及钛螺钉上得到均匀的珍珠粉涂层。涂层的质量随着外加电压、沉积时间的增加而增加。同时随着沉积时间的增加,电流在持续减小。其中,CaCh作为添加剂的悬浮液具有更高的稳定性,涂层沉积速度更快、更均匀;而冰乙酸作为添加剂的悬浮液可以得到结合力更高的涂层。XRD、FTIR分析表明,对于两种添加剂,电泳沉积过程都没有改变珍珠粉的晶体结构,其中的有机成分也得到了较好的保存。通过理论分析以及进一步实验表明:添加CaCh后,珍珠粉颗粒吸附了ca2+,其‘电势升高,使涂层沉积更快、更均匀;添加冰乙酸后,部分有机质溶出,并与珍珠粉颗粒共沉积,有机质起到桥接粘连作用,使涂层具有较高的结合力。关键词: 珍珠质;文石t钛:电泳沉积;生物活性涂层;结合力浙江大学硕士学位论文摘要 Abstract Nacre is a prised ofaragonite(CaC03)platelets shows excellent ic activity present paper,the structure of nacre andcoating pearl powder on titanium substrate by Electrophoretic Deposition(EPD)were investigated. Inthefirstpart ofthepaper,microstructure ofpearlpowder with differentsize WaS analyzed and the platy pearlpowder WaS prepared from the raw pearl ’ray diffractionindicated thatthenacre sheetwas consisted ofaragonite with allobvious(002) texture,while asthefinepearlpowder areconsisted ofaragonite with small amount of calcite(one stable structure ofcalcium carbonate).Oxidation by NaCl0 makes ponents between theplatesdestroyed,and theplatelets ofaragonite were obtained after ultrasonictreatment, Secondly,the process ofpreparing thepearlpowder coating by EPD Was investigated. The pearlpowder suspension was prepared using thealcohol asthesolventand the influence ofadditives onthedeposition bothaceticacidandCaCl2 additives,uniform coating was achieved under various voltage anddifferentdeposition time。Theweight ofthe coating increases against theapplied voltage anddeposition time and thecurrent deceases as thetimeincreasesduring deposition