Formation and vanishment of the intragranular microstructure in Si_2N_2O/Si_3N_4 nanocomposites  

作　　者：LUO JunTing,LIU RiPing & QI Li State Key Laboratory of Metastable Materials Science and Technology,College of Mechanical Engineering,Yanshan University,Qinhuangdao 066004,China 

出　　处：《Science China(Technological Sciences)》2010年第1期284-286,共3页中国科学（技术科学英文版）

基　　金：supported by National Postdoctoral Foundation of China (Grant No.20060400787);Science Foundation of China (Grant No.50901066)

摘　　要：Si2N2O/Si3N4 nanocomposites were fabricated by liquid phase sintering of amorphous nano-sized silicon nitride powders.The intragranular microstructure was observed and researched.Intragranular microstructure's β-Si3N4 was formed in Si2N2O matrix at the sintering temperature higher than 1650°C.It was discovered that intragranular microstructure could also disappear by transformation during high temperature annealing.Two possible mechanisms of the disappearance of intragranular microstructure were given.The effect of intragranular microstructure on main mechanical properties was also investigated.Si2N2O/Si3N4 nanocomposites were fabricated by liquid phase sintering of amorphous nano-sized silicon nitride powders.The intragranular microstructure was observed and researched.Intragranular microstructure’s β-Si3N4 was formed in Si2N2O matrix at the sintering temperature higher than 1650°C.It was discovered that intragranular microstructure could also disappear by transformation during high temperature annealing.Two possible mechanisms of the disappearance of intragranular microstructure were given.The effect of intragranular microstructure on main mechanical properties was also investigated.

关 键 词：Si2N2O/Si3N4 NANOCOMPOSITE intragranular MICROSTRUCTURE transformation VANISHMENT 

分 类 号：TB383.1[一般工业技术—材料科学与工程]