Effect of grain boundary segregation on aging resistance and mechanical properties of tetravalent element-doped 3Y-TZP ceramics for dental restoration  

作　　者：Bin Deng Rongfang Zou Yang Huang Lu Feng Yanru Chen 

机构地区：[1]Department of Stomatology,the First Medical Center,Chinese PLA General Hospital,Beijing,China [2]Chinese PLA Medical School,Beijing,China

出　　处：《International Journal of Smart and Nano Materials》2023年第2期170-188,共19页国际智能和纳米材料杂志（英文）

摘　　要：In the humid oral environment,3Y-TZP ceramics always suffer from low-temperature degradation(LTD)for a long time,which results in the degradation of mechanical properties and catastrophic failure.The low-temperature degradation(LTD)and mechanical properties of low-cost tetravalent(Ge^(4+),Ti^(4+))element-doped 3Y-TZP were investigated by analysing grain boundary segregation in samples with deferent contents.The results show that GeO_(2) is superior to TiO_(2) in limiting LTD but results in lower flexural strength and fracture toughness when the content is≥1.5 mol%.This dilemma can be improved by adding only 0.1%-0.5 wt%Al_(2)O_(3),and the flexural strength and fracture toughness of 0.25 wt% Al_(2)O_(3) zirconia are then increased to 898 MPa and 4.68 MPa·m^(1/2) compared with 1Ge-3Y,respectively.This work is expected to provide an effective reference for the development and application of budget dental materials.

关 键 词：3Y-TZP low-temperature degradation grain boundary segregation mechanical properties GeO_(2) 

分 类 号：TQ174[化学工程—陶瓷工业]