title: Effect of alumina on microstructure and compressive strength of a porous silicated hydroxyapatite.
abstract: OBJECTIVE
  We investigated the effects of alumina addition on microstructure and compressive strength of a porous silicate substituted hydroxyapatite (Si-HA).
  
  
  METHODS
  Hydroxyapatite (HA) was synthesized under precipitation conditions and 10 %Wt. of sol-gel derived CaO.P2O5.SiO2 based bioglass (BG) powder was added to HA. Polyurethane foam was used to form a high porous structure with integral porosity of 70%. Phase analysis was performed using XRD and FTIR and the microstructure was studied using SEM.
  
  
  RESULTS
  The results confirmed that the Si-HA was the only formed phase before Al2O3 addition while after addition the presence of silicon-incorporated HA and alumina without any other phases was proved using these analyses.
  
  
  CONCLUSIONS
  The porous structures of Si-HA and Al2O3 were synthesized using the replication technique. The compressive strength of porous bioceramics increased with increasing Al2O3 content up to 30 wt% (ANOVA, P<.05).
authors: Department of Mechanical Engineering, Babol (Noshirvani) University of Technology, Babol - Iran.
authors: Sayed Mahmood
authors: SM
authors: Rabiee
authors: Roya
authors: R
authors: Ravarian
authors: Mohammad
authors: M
authors: Mehmanchi
authors: Parastoo
authors: P
authors: Khoshakhlagh
authors: Misaq
authors: M
authors: Azizian
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry*; D002516:Ceramics / Q000737:chemistry; D019245:Compressive Strength; D017886:Durapatite / Q000138:chemical synthesis / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D011140:Polyurethanes / Q000737:chemistry; D016062:Porosity; D017640:Silicates / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D014961:X-Ray Diffraction
chemical_list: C022107:Bioglass; D011140:Polyurethanes; D017640:Silicates; D017886:Durapatite; D000537:Aluminum Oxide