在氧化镁部分稳定氧化锆基质原料中加入不同含量的CeO2,研究烧结、热处理过程中(Ce,Mg)-PSZ显微结构和相组成的变化.结果表明:CeO2的加入可促进高温下Mg2+在固溶体中的扩散,避免MgO在晶界偏析,有利于晶界净化;随CeO2含量增加,烧结体中晶粒尺寸减小,四方析出体更为稳定,不规则形态的立方氧化锆晶粒和波浪式晶界明显增多.通过热处理,相邻立方晶粒中四方析出体相互交联,最终(Ce,Mg)-PSZ基体中的晶界消失,颗粒合并,析出体交联形成连续态网络结构.
参考文献
| [1] | Garvie R C;Nicholson P S .Structure and thermochemical properties of partially stabilized zirconias in the CaO-ZrO2 system[J].Journal of the American Ceramic Society,1972,55:155-161. |
| [2] | Andrzej P;Miroslaw M B;Zibgnie P .Microstructure evolution and electrical properties of yttria and magnesia stabilized zironia[J].Materials Research Bulletin,2002,37:425-438. |
| [3] | Heuer A H .Transformation toughening in ZrO2-containing ceramics[J].Journal of the American Ceramic Society,1987,70(10):689-698. |
| [4] | Jensen D G .Enchanced toughness a partially stabilized at elevated temperatures[J].Journal of the European Ceramic Society,1996,16:825-831. |
| [5] | Czeppe T.;Zieba P.;Baliga W.;Dobrev E.;Pawlowski A. .Microstructure and phase composition of ZrO2-MgO-structural ceramic after high-temperature deformation[J].Materials Chemistry and Physics,2003(2/3):312-314. |
| [6] | Emad M;Matthias W;Werner W .Phase stability and microstructural characteristics of 12 mol(Mg,Ca)-PSZ prepared via polymeric route[J].Ceramics International,2003,29:189-194. |
| [7] | Mangalaraja RV.;Chandrasekhar BK.;Manohar P. .Effect of ceria on the physical, mechanical and thermal properties of yttria stabilized zirconia toughened alumina[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2003(1/2):71-75. |
| [8] | Jensen D G .Enhanced toughness of a partially stabilized zirconia ar elevated temperature[J].Journal of the European Ceramic Society,1996,16:82-831. |
| [9] | Lee J K;Kang H H .Ceria-stabilized zirconia ceramics with irregular grain shapes[J].Materials Letters,2000,42:215-220. |
| [10] | 蔡舒,谈家琪,陈玉如,袁启明,孟佳宏.烧成制度及杂质对Mg-PSZ材料析出体形态和力学性能的影响[J].硅酸盐通报,1999(06):17-20. |
| [11] | Lee J K;Kim Y J;Hwan K .Formation of irreglar grain shapes by ceria doping on 3 mol% yttria-stabilized zirconia ceramics[J].Materials Letters,1998,33:279-282. |
| [12] | 林一坚,吴杏芳,柯俊.IC-218合金再结晶时的晶界迁移[J].钢铁研究学报,2002(02):44-48. |
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