牙科氧化锆陶瓷压痕尺寸效应模型评价

目的:在分析现有氧化锆(Yttria partially stabilized zirconia,Y-TZP)陶瓷压痕尺寸效应规律和评价现有压痕尺寸效应模型基础上,推荐能准确描述Y-TZP陶瓷压痕尺寸效应的模型.方法:收集五种Y-TZP陶瓷压痕尺寸效应实验数据,回顾现有压痕尺寸效应模型,然后对现有压痕尺寸效应模型进行分...

Evaluation of indentation size effect models of dental zirconia ceramics

Objective:Based on the analysis of existing yttria partially stabilized zirconia(Y-TZP)ISE and the evaluation of existing ISE models,models which can accurately describe the indentation size effect(ISE)of Y-TZP ceramics were recommended.Methods:The experimental data of ISE were collected from five kinds of Y-TZP.The existing ISE models were reviewed,and then analyzed and evaluated.Results:To describing the normal ISE,which the hardness of Y-TZP decreased with the increase of indentation depth and gradually tended to a fixed value,T-R² of Bull,Hays-Kendal,Modified Nix-Gao,Nix-Gao,Li-Bradt93,Li-Bradt96 and Meyer models were 0.9885,0.9805,0.9136,0.9086,0.9198,0.7808 and 0.7169,respectively.The first reverse and then normal ISE,which the hardness of Y-TZP first increased and then decreased with the increase of indentation depth and gradually tended to a fixed value,could be reflected by Bull and Li-Bradtr96 models,R² of these models were 0.5380 and 0.4064,respectively.Conclusions:The Bull or Hays-Kendal models with larger T-R² is recommended to describe the normal ISE of Y-TZP,but none of the current models can accurately describe the first reverse and then normal ISE of Y-TZP.The mechanism of is that the experimental minimum indentation depth is much smaller than the grain size.