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Effect of Sintering Temperature on Aging Resistance and Mechanical Properties of 3Y-TZP dental ceramic

Journal of Wuhan University of Technology(Materials Science) 2012年第2期27卷 316-320页

作者：张静超 ZHAO Yongqi LIAO Yunmao JIANG Li YUN Xiaofei 李伟 State Key Laboratory of Oral Diseases Sichuan UniversityChengdu 610041China West China College of Stomatology Sichuan UniversityChengdu 610041China Hainan Stomatological Hospital Haikou 570105China

In order to investigate the effect of sintering temperature on aging properties and mechanical properties of 3Y-TZP dental ceramic in simulated oral environment, 3Y-TZP nanopowder compacts were pressurelessly sintered at 1 350℃, 1 400 ℃, 1 450 ℃,1 500 ℃, respectively, then were treated by soaking in artificial saliva （65 ℃, pH=7） for two months. The treated specimens sintered at 1 350 ℃ showed there was no phase transformation but whose strength and toughnesswere significantly improved （P〈0.05）, while those sintered at 1 400 ℃- 1 500 ℃ revealed a small amount of phase transformation and insignificant mechanical reinforcement （P〉0.05）. No microcracks were detected but increment in lattice volume was found in all specimens. Lowering sintering temperature favors aging resistance and mechanical reinforcement of 3Y-TZP in a simulated oral environment.

关键词： 3Y-TZP dental ceramic sintering temperature simulated oral environment lowtemperature aging

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Role of MgF2 addition on high energy ball milled kalsilite:Implementation as dental porcelain with low temperature frit

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Journal of Advanced ceramics 2014年第4期3卷 332-338页

作者： Pattem Hemanth KUMAR Abhinav SRIVASTAVA Vijay KUMAR Nandini JAISWAL Pradeep KUMAR Vinay Kumar SINGH Department of ceramic Engineering Indian Institute of Technology(BHU)VaranasiIndia Department of Chemical Engineering Indian Institute of Technology(BHU)VaranasiIndia

Porcelain fused to metal(PFM)has received great attention over the last few years due to its importance in the ***(K_(2)O·Al_(2)O_(3)·SiO_(2))is a high thermal expansion porcelain,suitable for bonding to ***,kalsilite is a metastable phase which gets converted into crystalline leucite upon *** the current work feasibility of developing stable kalsilite phase,dispersion of MgF2 in it as an additive and using mechanochemical synthesis are *** fine dental material has been formulated by mixing prepared kalsilite with low temperature frit(LTF)in different *** crystalline phases evolved in fired powders are characterized by powder X-ray diffraction(XRD)*** with different ratio of LTF has been cold pressed and heat treated to examine its coefficient of thermal expansion(CTE),flexural strength,apparent porosity(AP),bulk density(BD)and *** indicate that MgF_(2) addition and high milling duration help in kalsilite *** also plays an important role in this stabilization,and at 1100℃single phase kalsilite formation is *** outcomes demonstrate that it is easily possible to synthesize a stable single phase kalsilite with desirable properties.

关键词： kalsilite porcelain fused to metal(PFM) dental ceramic mechanochemical synthesis thermal expansion X-ray diffraction(XRD)

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