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

Perko, Sebastjan; Dakskobler, Aleš; Kosmač, Tomaž

doi:10.1016/j.jeurceramsoc.2012.02.001

Cited by 6 publications

(1 citation statement)

References 24 publications

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“…Results revealed that the ceramic can suffer a slow, tetragonal to monoclinic phase transformation at the samples surface in a humid atmosphere, followed by microcracking and a serious loss in strength, a phenomenon subsequently known as ageing or low temperature degradation (LTD). Ever since then, many researchers have experimented with Y-TZP with an attempt to understand the basic micro mechanisms of the ageing-induced ( ) to ( ) phase transformation and to suppress this LTD phenomenon [19][20][21][22][23][24]. Although the experimental observations of the ageing phenomenon are well understood, the actual mechanism responsible for the degradation has not been unequivocally explained.…”

Section: Introductionmentioning

confidence: 99%

Densification Behaviour and Mechanical Properties of Aluminium Oxide and Cerium Oxide-Doped Yttria Tetragonal Zirconia Polycrystal Ceramics Using Two-Step Sintering

Golieskardi

Satgunam

Ragurajan

2014

Journal of Nanoscience

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The densification behaviour, mechanical properties, and microstructure of high-purity Al2O3 and CeO2-doped Y-TZP with different weight percentage varied from 0.3 to 1 wt% were investigated. The samples were pressed uniaxially at 200 MPa into rectangular bars and discs and pressureless-sintered at temperature ranging between 1250°C and 1450°C for 2 h while the microstructure was characterized with a scanning electron microscope (SEM). Two-step sintering process works well for temperature higher than 1400°C and it created most tetragonal phase arrangement for stable structure to delay ageing through phase transformation. The mechanical properties in terms of bulk density, Young’s modulus, Vickers hardness, and fracture toughness were also measured. The results indicate that the addition of dopants accelerated the densification parameters and reinforced and toughened the obtained bodies. The maximum values for the mechanical properties of the Al2O3 and CeO2-doped Y-TZP ceramics were 6.01, 220 GPa, 13.8 GPa, and 7 MPa for density, Young’s modulus, Vickers hardness, and fracture toughness, respectively, which are higher than those of the doped samples.

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