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

作者：Perko Sebastjan^*; Dakskobler Ales; Kosmac Tomaz

来源：Journal of the European Ceramic Society, 2012, 32(11): 2633-2639.

DOI：10.1016/j.jeurceramsoc.2012.02.001

• Sintering
• Electron microscopy
• ZrO2
• Biomedical applications
• Densification

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 degrees C only the nanoparticles sinter in a bimodal mixture without any densification. By increasing the temperature to 900 degrees 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 degrees 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%.

• 出版日期2012-8