The densification and strength of porous Y-TZP materials with a bimodal particle size distribution for dental applications

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• 作者：Sebastjan Perko^a ; ^{sebastjan.perko@ijs.si} ; Ales Dakskobler^a ; ^b ; Tomaz Kosmac^a ; ^b
• 关键词：Sintering ; Electron microscopy ; ZrO2 ; Biomedical applications ; Densification
• 刊名：Journal of the European Ceramic Society
• 出版年：2012
• 期刊代码：53_09552219
• 类别：ms
• 出版时间：August, 2012
• 卷：32
• 期：11
• 页码：2633-2639
• 文件大小：1339 K

摘要

In this study the densification behavior of bimodal Y-TZP powder compacts consisting of nano/sub-micron-sized particles was studied and an explanation for their improved flexural strength while biscuit-sintered is provided. An in situ-heating TEM analysis revealed that up to 800 掳C only the nanoparticles sinter in a bimodal mixture without any densification. By increasing the temperature to 900 掳C the densification of the nanoparticles begins and partially densified nanoparticle clusters migrate into the contact area between the core particles. Consequently, the driving force for the sintering of the powder-blend compacts is reduced and this is reflected in a slower densification compared to that of the core material. At 1000 掳C the sintered nanoparticle clusters begin to incorporate into the core material, resulting in a sharp increase in the strength due to the increased neck area. Biscuit-sintered powder-blend compacts reached a plateau of strength at 670 MPa, which was reached at a relative density of 70%.