Ruslan Kuzmin, Nina Cherkasova, Sergey Veselov, Daria Lazurenko, Anatoly Bataev
{"title":"Role of t-ZrO2 stabilization methods in phase composition, structure and properties of ZTA ceramics","authors":"Ruslan Kuzmin, Nina Cherkasova, Sergey Veselov, Daria Lazurenko, Anatoly Bataev","doi":"10.1007/s41779-024-01114-7","DOIUrl":null,"url":null,"abstract":"<div><p>In this study, alumina–zirconia ceramics with ZrO<sub>2</sub> components obtained using different methods were investigated. Synthesized undoped ZrO<sub>2</sub> powder, commercial powder of ZrO<sub>2</sub>, doped with 3 mol% Y<sub>2</sub>O<sub>3</sub> 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 ZrOCl<sub>2</sub>-8H<sub>2</sub>O 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 ZrO<sub>2</sub> synthesized using the precipitation method increased the average size of ZrO<sub>2</sub> grains from 370 ± 20 nm to 560 ± 25 nm. During sintering of alumina-zirconia ceramics containing 20 vol% highly dispersed undoped zirconia, clusters of ZrO<sub>2</sub> 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 Al<sub>2</sub>O<sub>3</sub> grains. With the increase in total undoped zirconia content from 10 to 20 vol% in alumina–zirconia ceramics, the proportion of t-ZrO<sub>2</sub> 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 CeAl<sub>11</sub>O<sub>18</sub> 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*m<sup>1/2</sup> in Al<sub>2</sub>O<sub>3</sub>–ZrO<sub>2</sub> ceramics containing 15 vol% zirconia doped with 2 mol% ceria.</p></div>","PeriodicalId":673,"journal":{"name":"Journal of the Australian Ceramic Society","volume":"61 section","pages":"345 - 359"},"PeriodicalIF":2.1000,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of the Australian Ceramic Society","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1007/s41779-024-01114-7","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, CERAMICS","Score":null,"Total":0}
引用次数: 0
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.
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