Processing and Characterization of Nano Silicon Carbide Ceramics via Precursor Pyrolysis

2010 ◽  
Vol 434-435 ◽  
pp. 162-164
Author(s):  
Dong Lin Zhao ◽  
Lei Zhang ◽  
Zeng Min Shen
Keyword(s):  
Silicon Carbide ◽  
Nitrogen Atmosphere ◽  
Cross Linking ◽  
Mass Ratio ◽  
Ceramic Yield ◽  
Sic Ceramic ◽  
Nano Silicon ◽  
Carbide Ceramics ◽  
Silicon Carbide Ceramics

Nano silicon carbide ceramics were prepared via precursor pyrolysis. Polycarbosilane (PCS) and divinylbenzene (DVB) were selected as a precursor to silicon carbide ceramics and a cross-linking reagent for PCS, respectively. The cross-linking properties and pyrolysis of PCS and DVB were investigated by changing the mass ratios of PCS/DVB. The mass ratio of PCS/DVB has a great effect on silicon carbide ceramic yield. The cured PCS/DVB with a mass ratio of 1:0.5 has the highest SiC ceramic yield (63.1%) at the temperature up to 1500 °C and its pyrolyzates consiste of nano silicon carbide with a diameter of 10-40 nm. The microstructures of the nano silicon carbide ceramics were characterized by SEM and XRD. The pyrolysis behavior of the cured PCS/DVB was characterized by thermogravimetry in nitrogen atmosphere.

Processing of silicon carbide ceramics using chemically modified polycarbosilanes

1999 ◽  
Vol 14 (1) ◽  
pp. 189-195 ◽  
Author(s):  
Sachiko Okuzaki ◽  
Yuji Iwamoto ◽  
Shinji Kondoh ◽  
Koichi Kikuta ◽  
Shin-ichi Hirano
Keyword(s):  
Silicon Carbide ◽  
Phase Transformation ◽  
Nucleation Site ◽  
Metal Alkoxide ◽  
Transformation Behavior ◽  
Ceramic Yield ◽  
Chemically Modified ◽  
Α Phase ◽  
Carbide Ceramics ◽  
Silicon Carbide Ceramics

Chemically modified polycarbosilane (PC) which contains Si–Al–C–O component, PCOAl, was synthesized using PC and aluminum triisopropoxide. Ceramic yield was greatly improved through the modification of PC with a metal alkoxide. The phase transformation behavior and microstructure development of silicon carbide (SiC) were studied on β–SiC powders coated with chemically modified PC. The β-α phase transformation of SiC was enhanced by the coating of chemically modified PC on β–SiC powder. A unique microstructure with submicron-sized plate-like grains was developed, since the fine a phase produced at low temperature served as a nucleation site for the β-α phase transformation of SiC.

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

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.

The Effect of SiC Content on Pressureless Sintered Si2ON2-SiC Ceramic

2012 ◽  
Vol 562-564 ◽  
pp. 27-30
Author(s):  
Zhu Xing Tang ◽  
Hui Hui Tan ◽  
He Zhang ◽  
Ke Zhou Xu ◽  
Ying Zhang
Keyword(s):  
Silicon Carbide ◽  
Phase Composition ◽  
Silicon Oxynitride ◽  
Pressureless Sintering ◽  
Silicon Carbide Ceramic ◽  
Ceramic Samples ◽  
Sic Ceramic ◽  
Carbide Ceramics ◽  
Silicon Carbide Ceramics ◽  
Sintering Method

The Si¬2ON2-SiC ceramic was fabricated by pressureless sintering method. In this paper we researched the effect of SiC content (50%, 70% and 90%) on the performance of silicon oxynitride bonded silicon carbide ceramics. Through testing and analyzing the SEM, XRD, density and porosity of the final silicon oxynitride bonded silicon carbide ceramic samples, the results show that: changes in SiC content not only affect the bulk density of the composites but also affect the phase composition and the microstructure of fracture surface. The most compactness experimental product is sintered at1500°C containing 50wt% SiC.

Sign in / Sign up

Export Citation Format

Share Document