Al2O3-氮化硼纳米晶包覆的3%氧化钇稳定的四方氧化锆多晶复合陶瓷粉体的制备
Preparation processes of 3% yttria-stabilized tetragonal zirconia polycrystalline ceramic composite powders coated with nano-sized Al2O3-boron nitride
作者：吴金双, 周磊, 邢鹤琳, 王喆, 董超芳, 杨瑟飞
Author：Jinshuang Wu, Lei Zhou, Helin Xing, Zhe Wang, Chaofang Dong, Sefei Yang
收稿日期：2017-01-05 年卷（期）页码：2017,35(5):461-461-467
期刊名称：华西口腔医学杂志
Journal Name：West China Journal of Stomatology
关键字：氧化锆,复合陶瓷,Al<sub>2</sub>O<sub>3</sub>-氮化硼包覆,pH,煅烧温度,
Key words：zirconia,composite ceramic,Al2O3-boron nitride coating,pH,calcination temperature,
基金项目：国家自然科学基金（81371183）;海南省社会发展科技专项资金（sf201311）
中文摘要
目的 研究非均相沉淀法制备3%氧化钇稳定的四方氧化锆多晶陶瓷(3Y-TZP)/3%Al2O3复合粉的最佳pH值;3Y-TZP/3%Al2O3/10%BN双相包覆中,合成Al2O3及非晶氮化硼（BN）的最佳热处理温度。方法 不同pH值（6.5、7.5、8.5、9.5）下,通过非均相沉淀法合成Al2O3前驱体包覆3Y-TZP粉,通过透射电镜（TEM）选出包覆形貌较均匀的一组。将此pH下制备的复合粉经不同的温度（800、1 000、1 200、1 400 ℃）处理后,硼酸尿素反应烧结法（N2保护下,850 ℃煅烧5 h,850 ℃煅烧3 h及800 ℃煅烧5 h,800 ℃煅烧3 h）合成10%BN包覆3Y-TZP/3%Al2O3粉,通过TEM、能谱分析及X射线衍射（XRD）选出形貌及相组成最佳的一组。结果 当pH值为8.5时,3%Al2O3前驱体均匀地包覆在3Y-TZP颗粒周围;3%Al2O3前驱体经1 200 ℃煅烧,再包覆10%BN,在N2保护下800 ℃煅烧5 h,此时可见3Y-TZP颗粒周围包覆Al2O3及非晶BN,3Y-TZP/3%Al2O3/10%BN复合粉中Al-B-O化合物较少,且t-ZrO2所占的比例最多。结论 合成Al2O3前驱体包覆3Y-TZP的最佳pH值为8.5;双相包覆中,Al2O3前驱体的最佳处理温度为1 200 ℃,合成非晶BN的适宜条件为N2保护下800 ℃煅烧5 h。
英文摘要
Objective In this work, we aim to determine the optimum pH value for the preparation of 3% yttria-stabilized tetragonal zirconia polycrystalline (3Y-TZP)/3%Al2O3and optimum calcination temperature of Al2O3precursor and amorphous boron nitride (BN) for Al2O3-BN coating 3Y-TZP powders. Methods The 3Y-TZP/3%Al2O3composite powders were prepared through the heterogeneous precipitation method under different pH values (6.5, 7.5, 8.5, and 9.5) and analyzed through trans-mission electron microscopy (TEM) to determine the optimum coating morphology. Al2O3precursor, which was prepared under the optimum pH value, was calcined at different temperatures (800, 1 000, 1 200, and 1 400 ℃). The amorphous BN coating 3Y-TZP/3%Al2O3powder was prepared via in situ reaction with boric acid and urea (calcined with N2at 850 ℃ for 5 and 3 h and 800 ℃ for 5 and 3 h). TEM, energy dispersive spectrometry (EDS), and X-ray diffraction (XRD) were performed to characterize the results. Results The optimum coating morphology was obtained at 8.5 pH. When the Al2O3precur-sor was calcined at 1 200 ℃ and coated with BN (calcined with N2at 800 ℃ for 5 h), the Al-B-O compound was less, and t-ZrO2was more represented. Conclusion The optimum pH value for 3Y-TZP/3%Al2O3composite preparation is 8.5. For the preparation of Al2O3-BN coating 3Y-TZP powders, the optimum calcination temperature of the Al2O3precursor and amorphous BN are 1 200 and 800 ℃, respectively.
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