pH值对不同体系氧化锆的影响

发布时间：2018-03-04 00:22

  本文选题：牙科材料　切入点：牙修复体　出处：《中国组织工程研究》2017年26期 　论文类型：期刊论文

【摘要】：背景:目前有关不同实验参数对于氧化锆四方相影响的研究很多,但在水热反应中pH值对四方相的影响尚不明确。目的:利用水热合成方法制备两种氧化锆体系,并通过使用两种pH调节剂观察pH值对于不同体系氧化锆的影响,以及对四方相氧化锆影响的规律。方法:以分析纯硝酸锆(Zr(NO_3)_4·5H_2O)和硝酸钇(Y(NO_3)_3·6H_2O)为反应物,利用水热合成方法分别制备纯氧化锆(ZrO_2)和氧化钇稳定四方相氧化锆(Y-TZP)纳米粉体。利用X射线衍射分析(XRD)观察pH值和不同pH调节剂(氢氧化钠溶液与氨水/氢氧化钠溶液)对于纳米氧化锆的四方相纯度和晶粒尺寸的影响规律。结果与结论:(1)水热合成方法可以获得晶粒尺寸小于20 nm的高纯度氧化锆粉体;(2)当pH值大于10时可以获得四方相氧化锆含量高于单斜相氧化锆含量的样品;(3)相对纯氧化锆体系,pH值13时获得更多四方相氧化锆含量及更大晶粒尺寸;(4)对掺钇氧化锆体系,最佳pH值为12;(5)此外,在掺钇氧化锆体系中,氨水/氢氧化钠复合pH调节剂样品组的四方相相对含量均显著高于氢氧化钠调节剂样品组;(6)因此,控制pH值及选择合理的pH调节剂,可以得到四方相含量高,晶粒尺寸大的氧化锆。
[Abstract]:Background: there are many studies on the effect of different experimental parameters on the tetragonal phase of zirconia, but the effect of pH value on the tetragonal phase in hydrothermal reaction is not clear. Objective: to prepare two kinds of zirconia systems by hydrothermal synthesis. The effects of pH on zirconia in different systems and the rule of influence on tetragonal zirconia were observed by using two pH regulators. Pure zirconia zirconium oxide (ZZO _ 2) and yttrium stabilized tetragonal zirconia Y-TZP) powders were prepared by hydrothermal synthesis respectively. The pH value and different pH regulators (sodium hydroxide solution and ammonia water / hydroxide) were observed by X-ray diffraction (XRD). The effect of sodium solution on the tetragonal phase purity and grain size of nano-zirconia. Results and conclusion the high purity zirconia powder with grain size less than 20 nm can be obtained by hydrothermal synthesis method. More tetragonal zirconia content and larger grain size were obtained from the sample with tetragonal zirconia content higher than monoclinic zirconia content than that of pure zirconia system at 13:00. In addition, in the system of yttrium zirconia, the relative content of tetragonal phase in the sample group of ammonia / sodium hydroxide complex pH regulator is significantly higher than that of the sample group of sodium hydroxide regulator. Zirconia with high tetragonal content and large grain size can be obtained.
【作者单位】： 解放军沈阳军区总医院口腔科;中国医科大学公共基础学院;中国医科大学口腔医学院;
【基金】：国家自然科学基金基金(81500897) 国家留学(201408210385) 辽宁省教育厅项目(L2013285) 辽宁省科学技术计划项目(2014305012)~~
【分类号】：R783.1
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本文编号：1563340