Role of t-ZrO2 stabilization methods in phase composition, structure and properties of ZTA ceramics

IF 2.1 4区 材料科学 Q2 MATERIALS SCIENCE, CERAMICS
Ruslan Kuzmin, Nina Cherkasova, Sergey Veselov, Daria Lazurenko, Anatoly Bataev
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Abstract

In this study, alumina–zirconia ceramics with ZrO2 components obtained using different methods were investigated. Synthesized undoped ZrO2 powder, commercial powder of ZrO2, doped with 3 mol% Y2O3 and commercial powder of monocline zirconia doped with 2 mol% ceria were used. Highly dispersed (D50 < 100 nm) undoped zirconia was synthesized by precipitation from 1 M aqueous solution of ZrOCl2-8H2O with 25% aqueous ammonia solution. The resultant products were treated with water and isopropyl alcohol. Thermal treatment of the powder was carried out in a chamber furnace at a temperature beginning at 450 °C. Increasing the content of undoped ZrO2 synthesized using the precipitation method increased the average size of ZrO2 grains from 370 ± 20 nm to 560 ± 25 nm. During sintering of alumina-zirconia ceramics containing 20 vol% highly dispersed undoped zirconia, clusters of ZrO2 particles unite to form large grains (800–1100 nm). Zirconia crystals with sizes less than 300 nm in the ceramic structure are observed inside and in the joints of Al2O3 grains. With the increase in total undoped zirconia content from 10 to 20 vol% in alumina–zirconia ceramics, the proportion of t-ZrO2 remaining during sintering decreases from 6 to 2 vol%. The introduction of cerium nitrate into a suspension of monoclinic zirconia at the stage of dispersion leads to the formation of ceramic CeAl11O18 platelets with length of up to ~ 2 μm and width of ~ 0.15 μm. The bending strength is 800 ± 50 MPa and fracture toughness is 5.4 ± 0.7 MPa*m1/2 in Al2O3–ZrO2 ceramics containing 15 vol% zirconia doped with 2 mol% ceria.

Abstract Image

t-ZrO2稳定方法对ZTA陶瓷相组成、结构和性能的影响
本文研究了采用不同方法制备的含ZrO2组分的氧化铝-氧化锆陶瓷。采用合成的未掺杂ZrO2粉末、掺杂3mol % Y2O3的ZrO2工业粉末和掺杂2mol % ceria的单斜氧化锆工业粉末。以1 M的ZrOCl2-8H2O水溶液与25%的氨水相沉淀法合成了高度分散(D50 < 100 nm)的未掺杂氧化锆。所得产物用水和异丙醇处理。粉末的热处理在室内炉中进行,温度从450°C开始。增加沉淀法合成的未掺杂ZrO2的含量,使ZrO2晶粒的平均尺寸从370±20 nm增加到560±25 nm。在含有20体积%高分散未掺杂氧化锆的氧化铝-氧化锆陶瓷烧结过程中,ZrO2颗粒团簇结合形成大颗粒(800-1100 nm)。在Al2O3晶粒内部和接头处观察到陶瓷结构中尺寸小于300 nm的氧化锆晶体。随着总未掺杂氧化锆含量从10%增加到20%,烧结过程中残余t-ZrO2的比例从6%降低到2%。在分散阶段,将硝酸铈引入单斜氧化锆悬浮液中,形成了长度为~ 2 μm,宽度为~ 0.15 μm的陶瓷CeAl11O18薄片。含有15 vol%氧化锆掺杂2 mol%铈的Al2O3-ZrO2陶瓷的抗弯强度为800±50 MPa,断裂韧性为5.4±0.7 MPa*m1/2。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of the Australian Ceramic Society
Journal of the Australian Ceramic Society Materials Science-Materials Chemistry
CiteScore
3.70
自引率
5.30%
发文量
123
期刊介绍: Publishes high quality research and technical papers in all areas of ceramic and related materials Spans the broad and growing fields of ceramic technology, material science and bioceramics Chronicles new advances in ceramic materials, manufacturing processes and applications Journal of the Australian Ceramic Society since 1965 Professional language editing service is available through our affiliates Nature Research Editing Service and American Journal Experts at the author''s cost and does not guarantee that the manuscript will be reviewed or accepted
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