氧化锆与纳米羟基磷灰石陶瓷的剪切实验

摘要

背景：应用纳米羟基磷灰石作为表面改性材料经高温烧结结合于氧化锆陶瓷表面，可改善陶瓷材料的骨诱导活性，增强骨结合强度，而烧结温度是影响复合体性能和黏合的关键因素。目的：检测不同烧结温度下纳米羟基磷灰石陶瓷涂层与氧化锆陶瓷黏结后的剪切强度。方法：采用溶胶-凝胶技术制备纳米羟基磷灰石浆料，将其分层均匀涂布于20个氧化锆生坯表面，随机分为4组，将试件放置在无压烧结炉内，将烧结温度分别设定为1300，1400，1500，1550℃。利用万能材料试验机测定和计算烧结后4组试件的剪切强度，并观测分析断裂界面类型。结果与结论：随着烧结温度的升高，试件抗剪切强度逐渐增加，组间抗剪切强度两两比较差异有显著性意义[(4.04±1.19)，(6.60±0.95)，(16.51±1.93)，(80.47±19.31)MPa，P<0.05]，说明在温度为1550℃范围内，烧结温度与抗剪切强度呈正相关。结果表明，在一定的温度范围内，烧结温度越高，氧化锆与纳米羟基磷灰石陶瓷之间的抗剪切强度越高，温度为1550℃时，两者之间的抗剪切强度最高。%BACKGROUND:Nano-hydroxyapatite as a surface modification material that is bonded to the surface of the zirconia ceramics upon sintering at high temperature can improve bone-inducing activity and bone bonding strength of the zirconia ceramics. Moreover, the sintering temperature is crucial for performance and bonding of the composite. OBJECTIVE:To detect the shear strength of nano-hydroxyapatite ceramics coating bonded to zirconia ceramics at different sintering temperatures. METHODS:Nano-hydroxyapatite slurry was prepared using sol/gel technology. Thereafter, 20 zirconium green bodies were coated with nano-hydroxyapatite slurry and randomly divided into four groups. Then, the specimens were put into non-pressure sintering furnace and sintered at 1 300, 1 400, 1 500, and 1 550℃, respectively. At last, we measured the shear strength of al the specimens after sintering by universal testing machine, and analyze the type of fractures. RESULTS AND CONCLUSION: With the rising of sintering temperature, the shear strength of the specimens was gradualy increased, and there were significant differences between the four groups [(4.04±1.19), (6.60±0.95), (16.51±1.93), (80.47±19.31) MPa,P < 0.05]. Within the scope of 1 550℃, the sintering temperature was positively relative to the shear strength of specimens. These findings indicate that in the certain temperature range, the higher the sintering temperature, the greater the shear strength of the bonding interface between zirconia and nano-hydroxyapatite. When the sintering temperature is 1 550℃, the shear strength of the bonding interface is the highest.