Abstract
To improve the mechanical properties of a porous bioceramic without reducing its porosity, a new kind of porous hydroxyapatite (HA) bioceramic with in-situ grown HA whiskers was fabricated using a simple sintering method. CaSO42H2O was used as a pore-forming medium and also as a catalyst for the growth of in-situ HA whiskers. The bioceramic was analyzed by XRD, SEM and mechanical tests. In-situ grown HA whiskers were stratified on the cliffs of pores in the bioceramic. The compressive strength is as high as 21.7 MPa with the porosity of about 26%. The results show that porous HA bioceramic can be improved in both compressive strength and porosity by the addition of CaSO42H2O. This novel HA bioceramic has a higher compressive strength without reducing its porosity in a certain weight ratio of CaSO42H2O, which depends on its two-step fracture pattern. This novel structure provides a new and promising reinforced pattern for porous materials. & 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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