Z.W. Yang

Degradation Behavior of Calcium Sulfate/β-Tricalcium Phosphate Composites in Tris

CaSO4/β-TCP composite powders were prepared by mixing CaSO4 and β-TCP. The CaSO4 /β-TCP (VS: VP) values were varied from 3:2 to 0:1. The composites were sintered at different temperatures. Tris was used to evaluate degradation behavior of the composites. The morphologies of composites before and after degradation were studied by SEM. The results show that degradation was increased with the increasing of VS: VP and decreased with the increasing of sintered temperatures.

Synthesis of Calcium Phosphate/Gypsum Composite Powders

Gypsum powders and calcium phosphate/gypsum powders were synthesized by wet method. The influences of the pH and temperature on the morphology of the gypsum crystal were studied by light microscopy. The effects of the initial calcium/phosphorus molar ratio and the pH of the solution on the microstructure and phase composition of the calcium phosphate/gypsum composite powders were studied by scanning electron microscopy and X-ray diffractometry. The results show that both temperature and pH value had influence on the crystal shape of gypsum and the pH value was the predominant parameter for the particle shape and phase composition of the composite powders.