Preparation of Biodegradable Porous Calcium Metaphosphate Granules as Bone Filler by Starch Consolidation

Abstract

Porous calcium metaphosphate granules for bone fillers were prepared by starch consolidation with baking powder and surfactant. Paste for foaming was prepared by the mixing of calcium metaphosphate powder and water with the various amount of starch (10~20㎛ size), where solid contents 30%, 45%, 60% of the paste. In order to obtain the optimum micro/macro porous structure, the appropriate contents of baking powder and surfactant at a fixed content of starch were examined. In order to examine the content of baking powder on pore morphology, the baking powder was added 60, 180, and 300 wt% of the paste at fixed content of starch. And then, in order to investigate the effect of surfactant on porous structure, surfactant was added 0.035, 0.1, and 0.16 wt% of paste weight at fixed content of starch and baking powder. Foaming was conducted using microwave method, and foamed samples were sintered at 900 °C. The sintered porous blocks with starch only showed uneven and closed macro pores without any micro pores. However, the sintered porous blocks with starch, baking powder, and surfactant showed homogeneous micro and macro porous structures ranging 20~60, and 300~1000 ㎛ in pore size, respectively. The porosity was increased with the increase of surfactant up to about 70 %.

Starch consolidation of SiC ceramics: processing and low-temperature sintering in an air atmosphere

“…Depending on the processing technique selected, porosity content achieved, pore size distribution, and degree of pore interconnectivity factors which have direct effects on the properties of the porous ceramic are varied. Among the approaches taken in the recent focus on a novel processing of porous ceramics, the starch consolidation technique has attracted significant attention due to its near-net shaping capability without requiring specialized equipment, its ease of processing, and its cost-effectiveness [53][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68][69]. Also, components from simple to complex shapes can be produced by this technique.…”