Thermal treatment effect on structural features of mechano-synthesized fluorapatite-titania nanocomposite: A comparative study  

作　　者：Bahman NASIRI-TABRIZI 

机构地区：[1]Materials Engineering Department,Najafabad Branch,Islamic Azad University,Najafabad,Isfahan,Iran

出　　处：《Journal of Advanced Ceramics》2014年第1期31-42,共12页先进陶瓷（英文）

摘　　要：The influence of thermal treatment on the structural features of mechano-synthesized fluorapatite-titania composite nanopowders was studied.A mixture of calcium and phosphate reagents was mixed with a certain amount of titania(20 wt%)and then was mechanically activated for 5 h,10 h and 15 h respectively.After that,the mechano-synthesized powders were annealed at 700℃for 2 h.The crystallite size of the composite nanopowders estimated from Williamson-Hall method was in good agreement with transmission electron microscopy(TEM)analysis.Scanning electron microscopy(SEM)/TEM images confirmed the formation of a cluster-like composite which was composed of ellipse-like nanoparticles with an average size of about 16±7 nm after 15 h of milling.During the milling process,large variations in mechanochemical behavior of the CaHPO_(4)-Ca(OH)_(2)-CaF2-TiO_(2) system were detected.After the beginning of milling,no trace of the composite was found due to the lack of sufficient time for the mechanical activation.When the mechanical activation time increased to 15 h,composite nanopowders with the crystallite size of around 21.66 nm were formed.During heating at 700℃,the recovery of crystallinity occurred and the fraction of crystalline phase reached a maximum around 88.79%for the 10-h milled sample.Results indicated that the structural features of the composite were strongly influenced by the subsequent annealing.

关 键 词：NANOCOMPOSITE FLUORAPATITE thermal treatment Williamson-Hall method structural features 

分 类 号：TB3[一般工业技术—材料科学与工程]