Raman Scattering Characterization of Polytype in Silicon Carbide Ceramics: Comparison with X-ray Diffraction

2003 ◽  
Vol 86 (5) ◽  
pp. 823-829 ◽  
Author(s):  
Shin-ichi Nakashima ◽  
Makoto Higashihira ◽  
Kouji Maeda ◽  
Hidehiko Tanaka
Keyword(s):  
Silicon Carbide ◽  
Raman Scattering ◽  
X Ray Diffraction ◽  
X Ray ◽  
Carbide Ceramics ◽  
Silicon Carbide Ceramics

Study of Silicon Carbide Ceramics

2009 ◽  
Vol 1181 ◽  
Author(s):  
Malek Amir Abunaemeh ◽  
Ibidapo Ojo ◽  
Mohamed Seif ◽  
Claudiu Muntele ◽  
Daryush Ila
Keyword(s):  
Silicon Carbide ◽  
Photoelectron Spectroscopy ◽  
Uranium Oxide ◽  
Nuclear Reactor ◽  
X Ray ◽  
Triso Fuel ◽  
Carbide Ceramics ◽  
Silicon Carbide Ceramics ◽  
Very High

AbstractThe TRISO fuel that is intended to be used for the generation IV nuclear reactor design consists of a fuel kernel of Uranium Oxide (UOx) coated in several layers of materials with different functions. One consideration for some of these layers is Silicon Carbide (SiC) [1]. The design, manufacture and fabrication of SiC are done at the Center for Irradiation of Materials (CIM). This light weight material can maintain dimensional and chemical stability in adverse environments and very high temperatures. The characterization of the elemental makeup of the SiC material used is done using X-ray photoelectron spectroscopy (XPS). Nano-indentation is used to determine the hardness, stiffness and Young's Modulus of the material. Raman Spectroscopy is used to characterize the chemical bonding for different sample preparation temperatures.

scholarly journals Structural characterization of liquid phase sintered silicon carbide by high-resolution X-ray diffractometry

Cerâmica ◽  
2005 ◽  
Vol 51 (318) ◽  
pp. 168-172 ◽  
Author(s):  
C. A. Kelly ◽  
P. A. Suzuki ◽  
S. Ribeiro ◽  
S. Kycia
Keyword(s):  
Silicon Carbide ◽  
High Resolution ◽  
Mixed Oxide ◽  
Beta Phase ◽  
Alpha Phase ◽  
X Ray Diffraction ◽  
Solid Solution Formation ◽  
X Ray ◽  
Synchrotron Light

Silicon carbide (SiC) was sintered using two different additives: AlN-Y2O3 or AlN-CRE2O3. CRE2O3 is a mixed oxide formed by Y2O3 and rare-earth oxides. The crystalline structures of the phases were analyzed by high-resolution X-ray diffraction using synchrotron light source. The results of the Rietveld refinement of the mixed oxide show a solid solution formation. In both silicon carbide samples prepared using AlN-Y2O3 or AlN-CRE2O3 3C (beta-phase) and 6H (alpha-phase) polytypes were found. The structural and microstructural results for both samples were similar. This is an indication of the viability of the use of CRE2O3 in substitution for Y2O3 as additive to obtain dense materials.

Characterization of silicon carbide ceramics obtained from porous carbon structure achieved by plant carbonization

2020 ◽  
Vol 245 ◽  
pp. 122768 ◽  
Author(s):  
Vladimir Dodevski ◽  
Maja C. Pagnacco ◽  
Ivana Radović ◽  
Milena Rosić ◽  
Bojan Janković ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Porous Carbon ◽  
Carbon Structure ◽  
Carbide Ceramics ◽  
Silicon Carbide Ceramics

Synthesis and Characterization of Hafnium Carbide Based Ceramics

2014 ◽  
Vol 616 ◽  
pp. 1-7 ◽  
Author(s):  
Branko Matović ◽  
Dušan Bučevac ◽  
Vesna Maksimović ◽  
Snežana Nenadović ◽  
Jelena Pantić ◽  
...  
Keyword(s):  
Sol Gel ◽  
Carbide Powder ◽  
Hafnium Carbide ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sintering Additive ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Carbide Ceramics

Hafnium carbide powder was synthesized by sol-gel polycondensation of hafnium chloride with citric acid. The starting materials were dissolved in water and mixed homogeneously on a hot plate until a precomposite gel was formed. Pyrolysis of the obtained gel resulted in formation of monoclinic hafnia and amorphous carbon, which after subsequent heat treatment transformed into hafnium carbide. Materials were analyzed by means of X-ray diffraction and electron microscopy investigations. The results showed that the obtained carbide powder was composed of nearly equiaxed particles of narrow size distribution. The obtained hafnium carbide powder was densified via spark plasma sintering (SPS) at 1950 oC using molybdenun silicide as sintering additive. Microstructure and mechanical properties of the obtained hafnium carbide ceramics were investigated.

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