The fabrication of reaction-formed silicon carbide with controlled microstructure by infiltrating a pure carbon preform with molten Si

2004 ◽  
Vol 30 (3) ◽  
pp. 435-439 ◽  
Author(s):  
YanXiang Wang ◽  
ShouHong Tan ◽  
DongLiang Jiang
Keyword(s):  
Silicon Carbide ◽  
Carbon Preform ◽  
Pure Carbon

Formation of dense silicon carbide by liquid silicon infiltration of carbon with engineered structure

2008 ◽  
Vol 23 (5) ◽  
pp. 1237-1248 ◽  
Author(s):  
Jesse C. Margiotta ◽  
Dajie Zhang ◽  
Dennis C. Nagle ◽  
Caitlin E. Feeser
Keyword(s):  
Silicon Carbide ◽  
Bulk Density ◽  
Phenolic Resin ◽  
Pore Diameter ◽  
Chemical Reactivity ◽  
Liquid Silicon ◽  
Crystalline Cellulose ◽  
Carbon Preform ◽  
Median Pore ◽  
The Ideal

Fully dense and net-shaped silicon carbide monoliths were produced by liquid silicon infiltration of carbon preforms with engineered bulk density, median pore diameter, and chemical reactivity derived from carbonization of crystalline cellulose and phenolic resin blends. The ideal carbon bulk density and minimum median pore diameter for successful formation of fully dense silicon carbide by liquid silicon infiltration are 0.964 g cm−3 and approximately 1 μm. By blending crystalline cellulose and phenolic resin in various mass ratios as carbon precursors, we were able to adjust the bulk density, median pore diameter, and overall chemical reactivity of the carbon preforms produced. The liquid silicon infiltration reactions were performed in a graphite element furnace at temperatures between 1414 and 1900 °C and under argon pressures of 1550, 760, and 0.5 Torr for periods of 10, 15, 30, 60, 120, and 300 min. Examination of the results indicated that the ideal carbon preform was produced from the crystalline cellulose and phenolic resin blend of 6:4 mass ratio. This carbon preform has a bulk density of 0.7910 g cm−3, an actual density of 2.1911 g cm−3, median pore diameter of 1.45 μm, and specific surface area of 644.75 m2 g−1. The ideal liquid silicon infiltration reaction conditions were identified as 1800 °C, 0.5 Torr, and 120 min. The optimum reaction product has a bulk density of 2.9566 g cm−3, greater than 91% of that of pure β–SiC, with a β–SiC volume fraction of approximately 82.5%.

Deposition of Epitaxially Oriented Films of Cubic SiC on Silicon by Laser Ablation of Elemental Targets.

1994 ◽  
Vol 339 ◽  
Author(s):  
L. Rimai ◽  
R. Ager ◽  
W. H. Weber ◽  
J. Hangas ◽  
B. D. Poindexter
Keyword(s):  
Silicon Carbide ◽  
Laser Ablation ◽  
Crystalline Silicon ◽  
Epitaxial Films ◽  
Ablation Plume ◽  
Silicon Substrates ◽  
Pure Silicon ◽  
Silicon Target ◽  
Oriented Films ◽  
Pure Carbon

ABSTRACTSilicon carbide films are grown epitaxially on crystalline silicon substrates heated above 1000 °C, by laser ablation of pure carbon targets to thicknesses between 300 and 400 nm. These films grow on top of the silicon substrate from the carbon in the ablation plume and from the silicon of the substrate. By using a method of alternate ablation of a pure carbon and a pure silicon target, similar epitaxial films can be grown to thicknesses in excess of 1 μm with part of the silicon being supplied by the ablation plume of the silicon target.

Reaction forming of silicon carbide ceramic using phenolic resin derived porous carbon preform

2009 ◽  
Vol 29 (11) ◽  
pp. 2395-2402 ◽  
Author(s):  
Shunjian Xu ◽  
Guanjun Qiao ◽  
Dichen Li ◽  
Hong Yang ◽  
Yinong Liu ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Porous Carbon ◽  
Phenolic Resin ◽  
Carbon Preform ◽  
Silicon Carbide Ceramic

Characterisation of Silicon Carbide from Dark Red Meranti Wood

2016 ◽  
Vol 878 ◽  
pp. 108-113
Author(s):  
Noor Leha Abdul Rahman ◽  
Koay Mei Hyie ◽  
Anizah Kalam ◽  
Teng Wan Dung ◽  
Husna Elias
Keyword(s):  
Silicon Carbide ◽  
Gas Flow ◽  
Ceramic Materials ◽  
Heterogeneous Structure ◽  
Pyrolysis Process ◽  
Argon Gas ◽  
Carbon Preform ◽  
Silicon Carbide Ceramic ◽  
Major Weight Loss ◽  
Derivation Process

Porous biomorphic silicon carbide is a promising ceramic materials for used in wide variety of applications especially in filtration and separation. Wood derived silicon carbide retains the heterogeneous structure of initial wood. Silicon carbide ceramic was derived from Dark Red Meranti wood precursor in this study. The derivation process was prepared by reaction between liquid silicon and carbon preform. The carbon preform was obtained via pyrolysis process at 850 °C in Argon gas flow atmosphere. This process was followed by Si infiltration at 1500 °C for different holding hours. The density was determined using Archimedes method. SEM was performed to observe their microstructures while the compositions and phase analysis were analysed by EDX and XRD respectively. Thermogravimetric analysis showed that a major weight loss of about 60% of carbon perform due to the decomposition of cellulose and lignin.XRD results revealed the presence of SiC and excess of silicon. It was found that conversion efficiency of carbon into SiC has been improved when the holding time was increased.

Reaction Formed SiC Prepared by Room Temperature Freezing Casting

2012 ◽  
Vol 512-515 ◽  
pp. 297-300
Author(s):  
Chuan Qi Hu ◽  
Hua Wang ◽  
Hai Lin Liu ◽  
Yan Li Huo ◽  
Jie Tang ◽  
...  
Keyword(s):  
Mechanical Property ◽  
Silicon Carbide ◽  
Flexural Strength ◽  
Porous Carbon ◽  
Weibull Modulus ◽  
Room Temperature ◽  
Methyl Cellulose ◽  
Infiltration Process ◽  
Carbon Preform ◽  
Carbon Resource

The porous carbon preforms with fine pore structure has been successfully fabricated by room temperature freezing casting, and the reaction formed SiC with fine mechanical property has prepared successfully by liquid silicon infiltration process. Charcoal powder was used as carbon resource, camphene was used as sublimate vehicle, methyl cellulose was used as pore maker and bonder. The result shows that the homogeneity of the porous carbon preform has been improved largely by adding methyl cellulose ,and the defects of reaction formed silicon carbide has reduced largely also. The density, average flexural strength and Weibull modulus of the best reaction formed silicon carbide prepared in this paper is 2.86 g/cm3, 430.75MPa and 9.29 respectively.

Preparation of Cf/SiC Composites by Liquid Silicon Infiltration

2010 ◽  
Vol 434-435 ◽  
pp. 103-105 ◽  
Author(s):  
Chun Peng Wang ◽  
Jie Tang ◽  
Hai Lin Liu ◽  
Yan Li Huo ◽  
Yu Feng Chen ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Silicon Carbide ◽  
Carbon Fiber ◽  
Flexural Strength ◽  
Fracture Behavior ◽  
Binding Strength ◽  
Phenol Resin ◽  
Pure Carbon ◽  
Sic Composites ◽  
Fiber Preforms

The Cf/SiC made from carbon fiber preforms infiltrated by phenol resin, pure carbon slurry and aqueous C/SiC slurry showed different binding strength between carbon fiber and SiC matrix, thus influenced the fracture behavior of the composite. The fracture toughness of the Cf/SiC composites with the value of 9.82MPa•m1/2,improved remarkably compared with reaction- bonded silicon carbide (RBSC). But the flexural strength was less than 100 MPa, because of the existence of considerable amount of pores in C/SiC composites.

Effect of SiO2 on the preparation and properties of Pure Carbon Reaction Bonded Silicon Carbide ceramics

2004 ◽  
Vol 19 (1) ◽  
pp. 54-57 ◽  
Author(s):  
Wu Qi-de ◽  
Guo Bing-jian ◽  
Yan Yong-gao ◽  
Zhao Xiu-jian ◽  
Hong Xiao-lin
Keyword(s):  
Silicon Carbide ◽  
Pure Carbon ◽  
Carbide Ceramics ◽  
Silicon Carbide Ceramics

Irradiation behavior of pyrolytic silicon carbide

1983 ◽  
Vol 41 ◽  
pp. 72-73
Author(s):  
R. J. Lauf
Keyword(s):  
Silicon Carbide ◽  
Fission Products ◽  
Thermodynamics And Kinetics ◽  
Neutron Fluences ◽  
Fuel Particles ◽  
Sic Coatings ◽  
Irradiation Behavior ◽  
Kinetics Of ◽  
Htgr Fuel

Fuel particles for the High-Temperature Gas-Cooled Reactor (HTGR) contain a layer of pyrolytic silicon carbide to act as a miniature pressure vessel and primary fission product barrier. Optimization of the SiC with respect to fuel performance involves four areas of study: (a) characterization of as-deposited SiC coatings; (b) thermodynamics and kinetics of chemical reactions between SiC and fission products; (c) irradiation behavior of SiC in the absence of fission products; and (d) combined effects of irradiation and fission products. This paper reports the behavior of SiC deposited on inert microspheres and irradiated to fast neutron fluences typical of HTGR fuel at end-of-life.

Microstructural Evaluation of Silicon Carbide Whisker Reinforced Alumina Fabricated with Carbon-Coated Whiskers

1991 ◽  
Vol 49 ◽  
pp. 920-921
Author(s):  
K. B. Alexander ◽  
P. F. Becher
Keyword(s):  
Silicon Carbide ◽  
High Resolution Electron Microscopy ◽  
Ceramic Composites ◽  
Interface Debonding ◽  
Resolution Electron ◽  
Microstructural Evaluation ◽  
Carbon Coated ◽  
Electron Energy Loss ◽  
Interfacial Films ◽  
Debonding Process

The presence of interfacial films at the whisker-matrix interface can significantly influence the fracture toughness of ceramic composites. The film may alter the interface debonding process though changes in either the interfacial fracture energy or the residual stress at the interface. In addition, the films may affect the whisker pullout process through the frictional sliding coefficients or the extent of mechanical interlocking of the interface due to the whisker surface topography.Composites containing ACMC silicon carbide whiskers (SiCw) which had been coated with 5-10 nm of carbon and Tokai whiskers coated with 2 nm of carbon have been examined. High resolution electron microscopy (HREM) images of the interface were obtained with a JEOL 4000EX electron microscope. The whisker geometry used for HREM imaging is described in Reference 2. High spatial resolution (< 2-nm-diameter probe) parallel-collection electron energy loss spectroscopy (PEELS) measurements were obtained with a Philips EM400T/FEG microscope equipped with a Gatan Model 666 spectrometer.

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