23 Jul COMPOSITE BIOMATERIAL AND PROCESS FOR PREPARING THE SAME
Abstract
The invention relates to a composite biomaterial made of hydroxyapatite HAp reinforced with strontium titanate SrTiO, having improved physical, chemical and mechanical properties, compatible with the biological medium, applicable in implantology and tissue engineering, being intended for bone substitutes capable to replace, partially or totally, damaged bone portions, and to a process for preparing the same. According to the invention, the biomaterial comprises hydroxyapatite HAp, having a particle size in the range of 30…70 nm, reinforced with strontium titanate having a particle size in the range of 1.14…2.07 nm, in a mass ratio of 6…17% HAp and 94…83% SrTiO. The process, as claimed by the invention, consists in mixing in a mortar the hydroxyapatite and strontium titanate particles for 15 min and making tablets by using the solid-state reaction process by uniaxial pressing at the ambient temperature, using a press at the pressure of 7 MPa, after which the tablets are subjected to a heat treatment at a temperature ranging between 1000…1300°C, for 2…3 h, in air atmosphere with cooling to the ambient temperature, the resulting biocomposite material being stored in dark-coloured pharmaceutical containers to prevent contamination and the effects of luminous radiation thereupon.
Year: 2015
Country: RO
Doc No: 130663