Increased surface area during sintering of calcium phosphate glass and sodium chloride mixtures
authors Davim, EJC; Fernandes, MHV; Senos, AMR
nationality International
journal JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
author keywords Glass scaffold; Bioglass sintering; Microstructure; Specific surface area; Dilatometry
keywords MESOPOROUS BIOACTIVE GLASSES; BIODEGRADABLE SCAFFOLD; TISSUE REGENERATION; BONE-FORMATION; STROMAL CELLS; HYDROXYAPATITE; BEHAVIOR; 45S5; CRYSTALLIZATION; ANTIBACTERIAL
abstract Glass scaffolds were obtained by the salt sintering method, using mixtures of calcium phosphate glass, 25.42%SiO2-10.89% P2O5-32.68%CaO-31%Mg0(mol%), and salt, NaCl, pressed and sintered bellow the salt melting point, followed by leaching of the salt in water. The sintering behaviour of glass/salt powder mixtures was followed by dilatometry, BET and SEM. It was found that the specific surface area (SSA) of supports sintered between 700-750 degrees C and leached, can be 15-50 times higher than that of the glass precursor powder, a very surprising behaviour because it presents the opposite tendency of a typical sintering process. Dilatometric curves showed an unusual expansion from similar to 450 degrees C until similar to 700 degrees C, followed by shrinkage at higher temperatures. This expansion accompanies the observed increase of SSA and the microstructures showed a clear effect of reaction between the glass and the salt with remarkable wrinkling of the glass particle surfaces. This phenomenon was further investigated by using DTA, XRD and FTIR. (C) 2014 Elsevier Ltd. All rights reserved.
publisher ELSEVIER SCI LTD
issn 0955-2219
year published 2015
volume 35
issue 1
beginning page 329
ending page 336
digital object identifier (doi) 10.1016/j.jeurceramsoc.2014.08.009
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000344123700035
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