新型铌酸锂钠钾生物压电陶瓷的制备与性能研究

发布时间：2018-02-14 18:43

  本文关键词： 铌酸锂钠钾 羟基磷灰石 多孔生物压电陶瓷 蛋清 发泡法 压电性 介电性　出处：《江苏大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着生物技术的发展和对健康水平的不断追求,人们对生物陶瓷材料性能的要求也不断提高。生物压电陶瓷材料在生物相容性、无毒性、化学稳定性、修复性、修复速率等方面展现出较大的优势,在骨修复或骨替代医学应用领域有着广阔的应用前景。新型铌酸锂钠钾(LNK)生物压电陶瓷为Li元素掺杂改性的铌酸钠钾基陶瓷材料,压电性能优异,压电效应会对生物体内细胞的生长产生促进作用,从而有效地进行生物体修复。羟基磷灰石(HA)材料为人体内骨骼的主要成分,具有优异的生物相容性。多孔材料则具有较大的比表面积,其孔隙结构便于人体内部的营养物质和细胞进入,加快修复速率。本论文将生物陶瓷设计成多孔型,复合型并具有压电性,充分发挥了LNK材料的压电效应、HA的生物相容性和多孔材料三者的优势,采用干压法、发泡法分别制备了新型LNK、LNK-HA及其多孔生物压电材料,探讨了制备工艺对材料压电性能和介电性能的影响。得到主要结论如下:(1)烧结温度对LNK陶瓷性能影响显著。提高烧结温度有利于LNK晶体的发育、生长和气孔的排除,从而改善LNK陶瓷体致密度,提高材料压电与介电性能。LNK压电陶瓷最佳烧结温度为1000℃,此时d_(33)和Kp达到最大,分别为124.0p C/N和30.63%。(2)不同LNK、HA组分制备的LNK-HA复合陶瓷材料性能差异较大。随着HA含量不断增加,LNK-HA陶瓷材料内部气孔增多,致密度下降,介电和压电性能显著降低。此外,烧结时合适的烧结温度,有利于LNK-HA陶瓷内部气孔充分排除、致密度升高、晶粒发育完整,材料展现出良好的压电性能和介电性能。当LNK与HA质量比为9:1时复合,1050℃烧结的LNK-HA陶瓷综合性能优异,压电常数d_(33)值为34.0p C/N,相对介电常数为648.12,介电损耗为0.0187。(3)以蛋清为发泡剂,发泡法制备多孔压电陶瓷的工艺中,发泡剂加入量和浆料固相含量对多孔压电陶瓷的性能影响显著。提高浆料固相含量,使得浆料黏度增加,不利于充分发泡,形成的孔洞孔径减小,气孔率降低,压电性与介电性均呈现上升趋势。当逐渐增加发泡剂加入量时,多孔陶瓷气孔率提高,密度下降,孔径尺寸降低且分散均匀,相对介电常数大大减小。当浆料中LNK固相含量为65%、发泡剂加入30%时,制备的多孔LNK陶瓷拥有最佳d_(33)值为47.9p C/N,相对介电常数为67.29。当浆料中LNK-HA固相含量为65%,加入25%发泡剂制备的多孔LNK-HA陶瓷材料压电性能最佳。d_(33)值为16.3 p C/N,相对介电常数为52.91。
[Abstract]:With the development of biotechnology and the constant pursuit of health level, the requirements of bioceramics properties have been improved. The biocompatibility, non-toxicity, chemical stability, remediation of bioceramic materials, The rate of restoration shows great advantages and has a broad application prospect in the field of bone repair or bone substitute medicine. A new type of lithium sodium potassium niobate (LNK) bioceramics is a Li doped modified potassium niobate ceramic material. Piezoelectric properties are excellent, and the piezoelectric effect can promote the growth of the cells in the organism, thus effectively carrying out the biological repair. The hydroxyapatite (HA) material is the main component of the human body's skeleton. The porous material has a large specific surface area, and its pore structure facilitates the entry of nutrients and cells in the human body and speeds up the rate of restoration. In this paper, bioceramics are designed as porous. The composite type and piezoelectric properties make full use of the advantages of the piezoelectric effect of LNK and the advantages of porous materials and biocompatibility. A new type of LNK-LNK-HA and its porous biomaterials were prepared by dry pressure method and foaming method, respectively. The effect of the preparation process on the piezoelectric and dielectric properties of the LNK ceramics was discussed. The main conclusions are as follows: (1) Sintering temperature has a significant effect on the properties of LNK ceramics. Increasing the sintering temperature is beneficial to the development, growth and pore elimination of LNK crystals. In order to improve the density of LNK ceramics and improve the piezoelectric and dielectric properties of the materials. The optimum sintering temperature of LNK piezoelectric ceramics is 1 000 鈩，

本文编号：1511353