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Microstructure and properties of Si3N4-MoSi2 composites
A.Bellosi,S.Guicciardi,D.Sciti 한양대학교 세라믹연구소 2002 Journal of Ceramic Processing Research Vol.3 No.3
Si3N4-composite materials containing different amounts of MoSi2 were produced by hot-pressing. MoSi2 particles (mean size 0.8 mm) were homogeneously dispersed within a nanostructured Si3N4 matrix (mean grain size < 0.2 mm). The influence of MoSi2 inclusions on the microstructure, and electrical and mechanical properties of the composites is discussed and compared to the properties of monolithic Si3N4. As a result of the refined matrix microstructure and presence of ductile inclusions, these materials possess good mechanical properties, with bending strengths up to 1130 MPa (RT) and 880 MPa (1000°C) and fracture toughnesses up to 8 MPa·m½. Electrical resistivity is ~10-3 W·cm.
SiC Nano-materials produced through liquid phase sintering: processing and properties
D. Sciti,J. Vicensa,N. Herlinb,J. Grabisc,A. Bellosi 한양대학교 세라믹연구소 2004 Journal of Ceramic Processing Research Vol.5 No.1
SiC nano-powders, produced via laser and plasma synthesis were processed to obtain fully dense and nano-sized materials, with a grain size ranging from 80 to 150 nm. Densification was achieved through hot pressing, adding alumina and yttria as sintering aids, as used in conventional liquid phase sintered SiC from commercial powders. Different processing conditions were tested and compared to optimize the process. The densification behaviour was studied. The microstructure was analyzed by scanning and transmission electron microscopy. Vickers hardness, fracture toughness, Young modulus and bending strength were measured on dense samples. Mechanical tests show that, the properties of these nano-materials are comparable to those of sub-micrometre grain-sized SiC materials.