BICUVOX.1‐matrix composite electrolyte with yttria‐stabilized zirconia as an inert phase: SEM evaluation of the chemical stability under hydrogen atmosphere

Abstract

The purpose of this study is to evaluate the efficacy of yttria-stabilized zirconia (3Y-TZP) as an inert phase to prevent the decomposition of Bi2 V0.9 Cu0.1 O5.5 -δ (BICUVOX.1) electrolyte under reducing atmosphere. A post-mortem scanning electron microscopy (SEM) study was performed after chemical stability tests under hydrogen-rich atmosphere using a Sieverts-type apparatus. SEM results showed that BICUVOX.1 decomposition starts under a hydrogen pressure of 19.7 atm at 300°C, even in the case of the composite containing 3Y-TZP. The microstructure of BICUVOX.1 after decomposition was observed to be composed of microspheres ranging from 10 to 100 µm formed primarily of metallic bismuth. In the composite, in addition to microspheres, the microstructure contained bismuth fibers growth from the grain area of the BICUVOX.1 matrix. Despite significant surface morphological modifications, the grain-boundary-arranged 3Y-TZP particles in a BICUVOX.1-matrix composite did not result in enhanced chemical stability.

Effects of a bone graft substitute consisting of porous gradient HA/ZrO2and gelatin/chitosan slow‐release hydrogel containing BMP‐2 and BMSCs on lumbar vertebral defect repair in rhesus monkey

“…Zirconia is an inorganic material shown to have strong mechanical properties and low toxicity (Sollazzo et al, ). Additionally, it does not accumulate in body tissues, muscles, or bones after implantation because it is an inert material and cannot be degraded in vivo (Piva, Piva, Venturini, Floriano, & Morelli, ). In the present study, zirconia was used only to reinforce the HA materials.…”

Evaluation of porous gradient hydroxyapatite/zirconia composites for repair of lumbar vertebra defect in dogs

“…ZrO 2 alone does not accumulate in the body tissues, muscles or bones after implantation since it is an inert material and can not be degraded in vivo. 19 It exists in three polymorphic forms at ambient pressure: (1) monoclinic at <1170℃; (2) tetragonal at 1170℃–2370℃ temperature range and (3) cubic at >2370℃, until it melts at 2706℃. 31 In this study, the final sintering temperature of porous ZrO 2 material is 1550℃.…”

“…ZrO 2 alone does not accumulate in the body tissues, muscles or bones after implantation since it is an inert material and can not be degraded in vivo. 19 It exists in three polymorphic forms at ambient pressure: (1) monoclinic at <1170 C;…”

“…An inorganic material zirconia (ZrO 2 ) has high mechanical properties and low toxicity, 18 which is an inert material and cannot be degraded in vivo. 19 However, the mechanical properties of sintered ZrO 2 are known to be far greater than that of a cortical bone. In fact, the sintered 100% ZrO 2 substrate with a high bulk density has a mechanical strength greater than 2068 MPa.…”

Evaluation of a Novel HA/ZrO2-Based Porous Bioceramic Artificial Vertebral Body Combined with a rhBMP-2/Chitosan Slow-Release Hydrogel

“…The increase of the contact area between the HA and the newly- formed bone on the surface can promote the fusion between the grafted material and the host-bones [ 30 ]. In contrast, the zirconia (ZrO 2 ) has high mechanical properties and low toxicity [ 31 ], which is an inert material and cannot be degraded in vivo [ 32 ].…”