A. Cuneyt Tas

TL;DR: In this article, composite bioceramic powders of two of the most important inorganic phases of synthetic bone applications were prepared as submicrometer-sized, chemically homogeneous, and high-purity ceramic powders by using a novel, one-step chemical precipitation technique.

Abstract: Trabecular bones of almost all vertebrate organisms basically consist of macroporous (55–70% interconnected porosity) bone mineral, i.e. calcium hydroxyapatite (HA: Ca10(PO4)6(OH)2). The macroporosity observed in the trabecular bones then allows the ingrowth of the soft tissues and organic cells into the bone matrix. Sub-micron, chemically uniform, and high phase-purity HA powders produced in our laboratory were mixed, under vigorous ultrasonification, with methyl cellulose of appropriate amounts in the form of an aqueous slurry of proper viscosity and thickness. The ceramic cakes produced in this way were then slowly dried in an oven in the temperature range of 50–90 °C. Dried cakes of porous HA were physically cut into various prismatic shapes. These parts were then slowly heated in an air atmosphere to the optimum sintering temperature of 1250 °C. The HA bioceramic parts obtained by this novel ‘foaming technique’ were found to have tractable and controllable interconnected porosity in the range of 60–90%, with typical pore sizes ranging from 100–250 microns. Sample characterization was mainly achieved by scanning electron microscopy (SEM) studies and three-point bending tests.

TL;DR: In this article, the authors reported the utilization of high ionic strength (>1100 mM) calcium phosphate solutions in depositing 20-65-μm-thick, bonelike apatitic calcium phosphate on Ti6Al4V within 2-6 h, at room temperature.

TL;DR: The synthesized pureHA and TCP powders were found to be stable even at 1300°C in air for long heating times and suitable for the production of sub-micrometre HA/TCP composite powders in situ.

TL;DR: In this paper, powder compositions of LaGaO3,L a 0.9Sr0.1GaO2.95, and La0.8Sr 0.2Ga0.17O2 were prepared via a Pechini-type process that uses citric acid and ethylene glycol.