%0 Journal Article
%T Effect of Different Rare-Earth on Microstructure and Properties of α-Sialon Ceramics
%A Chunfeng LIU Feng YE Yu ZHOU Yongliang WANG Jiancun RAO Institute for Advanced Ceramics
%A Harbin Institute of Technology
%A Harbin
%A China
%A <br>
%J 材料科学技术学报
%D 2008
%I 
%X Densified Yb-,Y-,Dy-,Sm- and Nd-α-Sialon ceramics were prepared by two-step hot sintering.The variation of microstructure and properties with different rare-earth was investigated.The ceramics doped with smaller cations (Yb3 ,Y3 and Dy3 ) are fully composed of α-Siaion,while in the larger cations (Sm3 and Nd3 ) doped ceramics also exist a few intergranular phase M' (Re2Si3-xAlxO3 xN4-x) in triple-point pockets.With increasing the radius of the rare-earth cations,the elongated α-Sialon grains form instead of the equiaxed grains in Yb-α-Sialon,and the aspect ratio of grains increases.All the ceramics possess high hardness,and the value of 21 GPa is achieved for Yb- and Y-α-Sialon.With increasing the ionic size of rare-earth,the hardness decreases slightly but the toughness tends to increase.Nd-α-Sialon possesses the highest toughness with the value of 5.4 MPa·ml/2.
%K Rare-earth
%K Microstructure
%K Mechanical properties<br>α-Sialon
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=84529CA2B2E519AC&jid=324DC3CAB22330DB19158AE0A9B7BFA5&aid=34B0A1B33A57EB51A236862387F7E1AC&yid=67289AFF6305E306&vid=B91E8C6D6FE990DB&iid=B31275AF3241DB2D&sid=2D207DE75533FA7E&eid=8047434EAE0B2346&journal_id=1005-0302&journal_name=材料科学技术学报&referenced_num=0&reference_num=29