Zirconia-toughened alumina (ZTA) using yttria-stabilised zirconia is a good option for ceramic-ceramic bearing couples for hip joint replacement. Gelcasting is a colloidal processing technique capable of producing complex products with a range of dimensions and materials by a relatively low-cost production process. Using gelcasting, ZTA samples were prepared, optimising the stages of fabricatio...

Porous hydroxyapatite spheres were prepared by a modified gelcasting method producing a ceramic prosthesis with controled porosity. The spheres are approximately 2.2 cm in diameter with a relatively homogeneous pore size distribution from 10 to 40 microm in diameter. The samples were characterized by X-ray powder diffractometry (XRD) and Fourier transform infra-red spectroscopy (FTIR) to identi...

Thermoreversible gelcasting, a near-net-shape processing technique, is demonstrated here for titanium. The gelcasting system is composed of TiH2 particles suspended in a triblock copolymer gel that behaves as a viscous liquid above 56 C and an elastic solid at room temperature, a temperature-dependent transition that is fully reversible when solvent is present. Organic pyrolysis to remove the g...

AlliedSignal, Inc. Near-net-shape gelcasting process that Commercialization likely. is safer and less costly than conventional gelcasting based on acrylamide, a cumulative neurotoxin-demonstrated by making structural ceramic parts for very high-temperature applications. BioTraces, Inc. Multiphoton detection (MPD) technology— Licensee PetroTraces: applications of the demonstrated in enhanced imm...

This is a review article covering literature reported on consolidation of ceramic components out of aq.-based Al2O3, MgAl2O4 spinel, β-Si4Al2O2N6, β-SiAlON-SiO2 composite, and zirconia toughened alumina (ZTA) slurries following hydrolysis induced aq. gelcasting (henceforth referred to as GCHAS) route. GCHAS is a combination of aq. gelcasting (GC) and hydrolysis assisted solidification (HAS) rou...

bioinert ceramics, like alumina and zirconia are used mainly for replacements of bones, hip joints and for dental implants. partially stabilized zirconia ceramics (psz or tzp with 3 mol.% or 5 wt.% y2o3), appear as perspective bioinert ceramics because of their high strength and corrosion resistance. in order to fabricate complex shapes, it is essential to use a near net shape processing like g...

Lightweight, porous ceramic structures are being developed for a variety of biologically-related applications. In bioengineering, there is interest in replacing metal-based implants with more functional implants consisting of porous bioceramics that are bioresorbable. In the design of bioinspired ceramic structures, there is a desire to understand the coupling between geometric complexity and p...