Optimized sintering and mechanical properties of Y-TZP ceramics for dental restorations by adding lithium disilicate glass ceramics

Abstract

The novel dental ceramics can be fabricated at lower temperatures when sol-gel derived lithium disilicate glass ceramics (LDGC) was used as an additive for yttria stabilized tetragonal zirconia polycrystalline (Y-TZP) ceramics. The effect of LDGC on the sintering, mechanical, and translucent properties of Y-TZP ceramics was investigated in the present study. The results showed that the LDGC additive effectively improved the densification of Y-TZP at 1100 °C, which was much lower than the sintering temperature for pure Y-TZP. When sintered at 1100 °C, the Y-TZP with 1 wt% LDGC reached a relative density of 95.45%, and prossessed a flexural strength of 482.4 MPa and a fracture toughness of 5.94 MPa·m1/2. Moreover, its translucency was also improved. While, the addition of LDGC could result in an escape of yttrium atoms from the grain lattice of zirconia, which induced the tetragonal-monoclinic transformation of zirconia and abnormal growth of monoclinic grains. The escaped yttrium atoms diffused into the intergranular glass phase. The results indicated that the novel Y-TZP-LDGC ceramics has a great potential to be used for all-ceramic restorations.

The Effect of Y3+ Addition on Morphology, Structure, and Electrical Properties of Yttria-Stabilized Tetragonal Zirconia Dental Materials

“…The densification of the CIP-processed Y-TZP materials can be promoted by using densification additives [ 30 ]. These kinds of materials assist densification through liquid sintering, which in turn facilitates ion diffusion.…”

“…Next, the less dense morphology of the sample S1 can be explained as follows. Firstly, the added 3Y-TZP powder (prior to sintering) is tougher and harder to compress ( Figure 2 ), and secondly, the quantity of the densification promoters may be lower [ 30 ]. On the other hand, the morphology of the sample S9 is denser ( Figure 3 ) as 5Y-TZP powder is less hard and there may be more additives for densification.…”

Synthesis of γ‐Bi 2 O 3 /YSZ composite powders using a facile precipitation method

“…The electrolyte is considered as a heart in SOFC components because it is the pivot of the ionic migration media 1,2 . Alternative electrolyte materials have been developed in recent years, such as scandia doped zirconia, samarium doped ceria to name a few 1,3 . Yttria stabilized zirconia (YSZ) is considered a superior choice and has been extensively used due to its good electrochemical activity and mechanical properties 4–6 .…”

“…1,2 Alternative electrolyte materials have been developed in recent years, such as scandia doped zirconia, samarium doped ceria to name a few. 1,3 Yttria stabilized zirconia (YSZ) is considered a superior choice and has been extensively used due to its good electrochemical activity and mechanical properties. [4][5][6] However, more than 1500 • C sintering temperature is normally necessary to fabricate dense YSZ material.…”

Effect of Cr2O3 nanosheet insertion on the deuterium permeation behavior of a Cr-Zr-O coating

“…The construction of a composite coating to balance hydrogen permeation resistance and adaptability with metal substrates is therefore necessary. By considering great thermal stability, chemical inertness and the greatest matching thermal expansion coefficients in ceramic materials, in this study, ZrO 2 , with high thermal stability chemical inertness and good matching thermal expansion coefficients with austenitic steels [12][13][14][15], is chosen as the matrix to construct composite coatings as a hydrogen isotope permeation barrier.…”