Sintering behavior and property of bioglass modified HA-Al2O3 composite

Li-li Wang, Xiu-Feng Wang, Xu Ding, Jian-feng Zhu
2012 Science of Sintering  
The bioglass modified HA-Al 2 O 3 composites were successfully fabricated by mixing HA, synthesized by wet chemical method between precursor materials H 3 PO 4 and Ca(OH) 2 , with 25wt% Al 2 O 3 and different content of bioglass (5%, 25%, 45%, 65wt%) respectively, with a mole fraction of 53.9%SiO 2, 22.6%Na 2 O, 21.8%CaO, and 1.7wt%P 2 O 5 , sintered in air at various temperatures (750-950°C) for 2h. when the content of bioglass is below 45wt% in the composite, HA decomposes completely and
more » ... forms to β-TCP. The main phase in this case are β-TCP, Al 2 O 3 and Ca 3 (AlO 3 ) 2 .When the content of bioglass is above 45wt% in the composite, the decomposition of HA to β-TCP is suppressed and the main phases in this case are Al 2 O 3 and HA, DCP CaHPO 4 and β-TCP, which almost have the same chemical composition, forming ternary-glass phase, and have better bioactive than pure HA. It can also be found that at the certain addition of bioglass, the higher sintered temperature, the bigger volume density and flexural strength of the composite are, but when the sintered temperature reaches 950°C, they decrease. This modified HA-Al 2 O 3 composites by calcium silicate glass have a much lower sintering temperature and decrease the production cost much.
doi:10.2298/sos1203265w fatcat:lgz37uscozhelf4rhy6lzc4kl4