ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The densified α-sialon ceramics with the compositions RE0.333Si10Al2ON15 (RE= Yb,Y, Dy,Sm and Nd) were prepared by a two-step hot-pressing sintering. The ceramics doped with smaller cations(Yb3+, Y3+ and Dy3+) are fully composed of α-sialon, while the larger cation-doped ceramics (Sm3+ andNd3+) exist a few M′ (RE2Si3-xAlxO3+xN4-x) phases. A small amount of β-sialon phases are also found inthe Nd-doped sialon. Microstructure observation indicates that Yb-α-sialon consists of equiaxial grains,but when increasing the radius of the doped cations, the elongated α-sialon grains form and the aspectratio of grain increases slightly. TEM observation indicated that almost no intergranular phases exist inthe α-sialon doped with smaller cations, but a few exist in Sm- and Nd-doped α-sialon. Some elongatedα-sialon grains with grain core were found. EDX results suggest that the compositions of the grain shelland that of the core are different. Surrounding the grain core, some misfit dislocations were seen
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1182.pdf
