Stoichiometric Hydroxyapatite (Ca10(PO)6(OH)2, HAP) foams, have been produced. The porous parts were prepared from a calcined HAP powder and egg white as a bio and nontoxic pore promoter. The colloidal slurry was prepared, poured into cylindrical molds, dried, unmolded, and sintered at 1200 °C. The effects of the concentration of the solid loading, of the dispersing agent, and the foaming agent on the ceramic preparation were examined. X-Ray Diffraction (XRD) and Fourier Transform Infrared (FTIR) were used to evaluate the composition and the structure of the sintered HAP ceramics. Scanning Electron Microscopy (SEM) was used for microstructural analysis. The XRD analysis of the porous parts, prepared under optimized conditions, showed the presence of crystalized HAP (JCPDS 9-432) as a single phase. SEM images showed existence of open and interconnected micro and macro-pores in the ceramics. The use of the egg white protein as pore former provides a total porosity of 86 vol-% and a foam-structure that allows to a micro-porous wall.
Characterization of β-tricalcium phosphate-clay mineral composite obtained by sintering powder of apatitic calcium phosphate and Montmorillonite, Surfaces and Interfaces (2019), doi:
In this work, we characterize tricalcium phosphate powders Ca9(HPO4)(PO4)5(OH) resulting from a reaction between calcium hydroxide and orthophosphoric acid at room temperature, without pH adjustment and in absence of ionic impurities. The prepared powder has an atomic ratio Ca/P of 1.512 ± 0.005. The real density is 2.68 ± 0.02 g/cm3 and the specific surface area is 80 ± 02 m2 /g. During compression, the microstructure of Cadeficient apatite powder with the presence of HPO4 groups seems to support the cohesion between particles. The transmission ratio is 90%, the transfer ratio is 41.8 and the ratio of the die-wall friction is 0.22. These results show that apatitic tricalcium powder gives a good aptitude to the compaction which leads to a good tensile strength (0.79 MPa). The heat treatment of the prepared powder shows the precise temperature for the formation of pyrophosphate, β-TCP and α-TCPa phases. The purity and aptitude to compaction of the prepared powders are very promising for pharmaceutical and medical applications.
Cu3(PO4)2 ′ 3 H2O wandelt sich beim Erhitzen auf 550°C in eine neue Cu3(PO4)2‐Modifikation um, die chemisch analytisch und röntgenographisch charakterisiert wird.
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