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RISS 인기검색어
- 검색키워드
- 저자 : Sciti, Diletta (검색결과 3 건)
- 무료
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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.
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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.
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Synthesis and densification of ultra-fine ZrC powders-effects of C/Zr ratio
Yu, Lei,Feng, Lun,Lee, Hyung Ik,Silvestroni, Laura,Sciti, Diletta,Woo, Yi Jin,Lee, Sea-Hoon Elsevier 2019 International journal of refractory metals & hard Vol.81 No.-
<P><B>Abstract</B></P> <P>The excess carbon and oxygen contents of ZrC nano-powders was controlled, and the resultant effects on the densification of ZrC was analyzed. The particle size of the synthesized ZrC powder was about 200 nm and its oxygen content was 0.49 wt%. The good results can be attributed to the rapid heating and cooling rate, the beneficial effects of current, and the relatively low synthesis temperature by using SPS (Spark plasma sintering) for the powder synthesis. The homogeneous distribution between reactants was an important factor to minimize the formation of excess carbon. With increasing the amount of carbon in the raw powder mixture, the oxygen content of ZrC powders decreased and the densification was suppressed. The decrease of excess carbon content, the presence of oxygen in the ZrC lattice, and the fine particle size promoted the sintering of ZrC ceramics without any additives at relatively low temperature and pressure (1750 °C, 40 MPa).</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ultra-fine ZrC powders were synthesized using a spark plasma sintering apparatus. </LI> <LI> ZrC powder with particle size of 200 nm and oxygen content of 0. 49 wt% was obtained. </LI> <LI> The powder can be densified without additives at low temperature and pressure. </LI> <LI> Low carbon content, and the oxygen in the lattice were benefit for the densification. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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