Bulk calcium phosphate biomaterials without sintering were synthesized at room temperature by infiltrating various orthophosphate aqueous solutions into a porous Ca(OH)2 green powder compact. These orthophosphate aqueous solutions were prepared from a different ratio of Ca(OH)2/H3PO4 up to pH=12. The infiltrated specimens did not show any shape or dimension changes at a lower concentration of H3PO4 or a liquid with pH>2. When the liquid contained some supersaturated solids or precipitates, the infiltrated specimens showed their reacted phases at the surface similar to these supersaturated precipitates, which were Ca(H2PO4)2∙H2O (MCPM), CaHPO4∙2H2O (DCPD), or Ca10 (PO4)6 (OH)2 (HA) as pH was increasing. Under a liquid infiltration with a lower concentration of H3PO4 liquid, a functional graded calcium orthophosphate composite was observed. Furthermore, relationships among processing factors like pH plus impurities and liquid concentration, phase formation, and microstructure of infiltrated specimens were discussed in detail.
No takes yet. Share an insight, caveat, or question.
Cao et al. (2016) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: