Effects of BN content on the mechanical properties of nanocrystalline 3Y-TZP/Al_(2)O_(3)/BN dental ceramics  

作　　者：Lei Zhou Yan-fang Zhang Pan Yi Ying Wen Chao-fang Dong Li-min Meng Se-fei Yang 

机构地区：[1]Medical School of Chinese PLA,Beijing 100853,China [2]Department of Stomatology,The First Medical Center,Chinese PLA General Hospital,Beijing 100853,China [3]Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China [4]Journals Publishing Center,University of Science and Technology Beijing,Beijing 100083,China [5]Department of Medical Imaging,Air Force Medical Center,PLA,Beijing 100142,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2021年第11期1854-1860,共7页矿物冶金与材料学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.81371183).

摘　　要：3Y-TZP/3wt%Al_(2)O_(3) powder was coated with varying amounts of BN using the urea and borate reaction sintering method,and then multiphase ceramics were prepared by hot pressing sintering.The micro-topography and the compositional analysis of synthesized ceramics were conducted through scanning electron microscopy,transmission electron microscopy and X-ray diffraction.A mechanical tester was used to analyze the Vickers hardness,fracture toughness,and bending strength of the synthesized ceramics.The results showed that the ceramic with a BN content of 12wt%showed the best processability,but had diminished mechanical properties(such as fracture toughness and bending strength).The ceramic with a BN content of 9wt%showed better processability than those with 3wt%and 6wt%BN.However,the fracture toughness was affected by the addition of 9wt%BN,making this ceramic only usable as a base material for a three-unit fixed bridge.In contrast,the ceramics with a BN content of 3wt%or 6wt%fulfilled the criteria for use in multi-unit restoration,but their low processability made them unsuitable for milling after sintering.

关 键 词：multiphase ceramic boron nitride mechanical properties reaction sintering method 

分 类 号：TQ174.1[化学工程—陶瓷工业] R783.1[化学工程—硅酸盐工业]