بیومواد آلومینا چقرمه شده با زیرکونیا برای جایگزین مفصل

Advances in zirconia toughened alumina biomaterials

for total joint replacement

پیشرفت ها در بیومواد آلومینا چقرمه شده با زیرکونیا برای جایگزین کلی مفصل

ABSTRACT

The objective of this article is to provide an up-to-date overview of zirconia-toughened alumina (ZTA) components used in total hip arthroplasties. The structure, mechanical properties, and available data regarding the clinical performance of ZTA are summarized. The advancements that have been made in understanding the in vivo performance of ZTA are investigated. This article concludes with a discussion of gaps in the literature related to ceramic biomaterials and avenues for future research.

 

تولید زیرکنیای تثبت شده با ایتریا به کمک تفجوشی مایکروویو

Microwave synthesis of yttria stabilized zirconia

تولید زیرکنیای تثبت شده با ایتریا به کمک تفجوشی مایکروویو

 

ABSTRACT

Yttria stabilised zirconia (YSZ) nanocrystals, with a mean size between 5 and 10 nm, were prepared by microwave flash synthesis. Flash synthesis was performed in alcoholic solutions of yttrium, zirconium chloride and sodium ethoxide (EtONa) using a microwave autoclave (RAMO system) specially designed by authors. Energydispersive X-ray analysis (EDX), X-ray powder diffraction (XRD), BET adsorption technique, photon correlation spectroscopy (PCS) transmission and scanning electron microscopy (TEM and SEM) are used to characterized these nanoparticles. Compared with conventional synthesis, nanopowders can be produced in a short period (e.g. 10 s), both high purity and stoechiometric control are obtained. Nevertheless, this mean of production is more cheaper and much faster than the ones commonly used to produce yttria stabilized zirconia (YSZ) by conventional sol–gel techniques.