The effect of porous carbon preform and the infiltration process on the properties of reaction-formed SiC

Wang, Yanxiang; Shi, Tan; Jiang, Dongliang

doi:10.1016/j.carbon.2004.03.018

Cited by 142 publications

(71 citation statements)

References 17 publications

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“…28 While the overall specimen dimensions did not significantly change, the volume change was accommodated within the pores. This resulted in decreased pore diameters, but some of the pore walls in the BE specimens were damaged, which led to some effectively larger pores 2.…”

Section: A Microstructurementioning

confidence: 94%

Mechanical properties of wood-derived silicon carbide aluminum-alloy composites as a function of temperature

et al. 2008

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The mechanical behavior [i.e., stiffness, strength, and toughness (K IC )] of SiC Al-Si-Mg metal-ceramic composites (50:50 by volume) was studied at temperatures ranging from 25 to 500°C. The SiC phase was derived from wood precursors, which resulted in an interconnected anisotropic ceramic that constrained the pressure melt-infiltrated aluminum alloy. The composites were made using SiC derived from two woods (sapele and beech) and were studied in three orthogonal orientations. The mechanical properties and corresponding deformation micromechanisms were different in the longitudinal (LO) and transverse directions, but the influence of the precursor wood was small. The LO behavior was controlled by the rigid SiC preform and the load transfer from the metal to the ceramic. Moduli in this orientation were lower than the Halpin-Tsai predictions due to the nonlinear and nonparallel nature of the Al-filled pores. The LO K IC agreed with the Ashby model for the K IC contribution of ductile inclusions in a brittle ceramic.

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Section: A Microstructurementioning

confidence: 94%

Mechanical properties of wood-derived silicon carbide aluminum-alloy composites as a function of temperature

et al. 2008

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“…Successively, liquid Si quickly infiltrates the porous SiCC green compacts with 3647% porosity by a capillary action process. 16) If the green compacts have larger pore size and higher porosity, the green compacts are fully infiltrated. The in situ reaction occurs between the liquid Si and the carbon black to produce a secondary ¢-SiC phase, which then bonds to the original SiC matrix particles.…”

Section: Resultsmentioning

confidence: 99%

“…Several studies on the microstructure, 9)11) high temperature properties, 12)14) additives 6), 15) and carbon perform 16) of reactionbonded SiC ceramics have been reported. Even though many studies of reaction-sintered SiC have been carried out, the influence of the particle size and composition of SiC powder on the fabrication of reaction-bonded SiC ceramics has not been fully investigated.…”

Section: )4)mentioning

confidence: 99%

Influence of uni and bi-modal SiC composition on mechanical properties and microstructure of reaction-bonded SiC ceramics

Jang

Kim

Han

et al. 2010

J. Ceram. Soc. Japan

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Influence of SiC composition with different particle size on mechanical properties and microstructure of reaction-bonded SiC have been investigated using infiltration process of liquid Si. SiC specimens were prepared by reaction-bonding sintering at 1620°C in vacuum using different SiCC composition. Reaction-bonded SiC specimens show dense with 3.03.05 gr/cm 3 of density. SiC specimens with bi-modal SiC composition show a fine microstructure than those of uni-modal SiC composition. In addition, in the specimens with bi-modal SiC composition, the microstructure of the sample with use of fine SiC starting powders is finer rather than those of use of relatively coarse SiC starting powders. The flexural strength and fracture toughness of specimens with bi-modal SiC composition are higher than those of uni-modal SiC composition. The main fracture mode of specimens with a high strength is intergranular fracture.

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“…Besides, the silicon must be infiltrated deep into the carbon template in order to have higher chance of reaction between them to form SiC. It is important to make sure the infiltration rate to be more than the reaction rate to avoid 'pore chocking' to occur [13]. Chocking which is an early termination of reaction may occur when the silicon does not have enough time to fully infiltrate into the preform, meanwhile the outer pore of the carbon template is full with silicon and block further infiltration.…”

Section: Figure 2 Sem Images Of Carbon Template From (A) Kapur and (mentioning

confidence: 99%

Conversion of biomorphic silicon carbide from wood powders carbon template

Elias

Hyie

Kalam

et al. 2016

AIP Conference Proceedings

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Abstract. Ecoceramic product produced by natural and renewable resources is a new variety of materials which has been widely used in industries over the recent years. A novel process regarding the fabrication of biomorphic silicon carbide ceramics has been explored from natural wood waste. The synthesis of biomorphic silicon carbide (SiC) requires two crucial processes, which are pyrolysis and silicon infiltration. In this study, the processing and characterization of silicon carbide ceramics from natural wood powders precursor was investigated by using two types of Asian wood powders, which are Kapur and Dark Red Meranti. The fine wood powders were hot pressed to obtain pre-templates, which then undergo carbonization process to form carbon templates. Pyrolysis up to 850°C was conducted in Argon flow atmosphere to produce the carbon template. The carbon template was then converted into biomorphic SiC ceramics through liquid infiltration at 1500°C. This study was to investigate the effect of infiltration holding time on the formation of dense SiC. Three different holding times of 2 to 4 hours were used during the infiltration process. Thermogravimetric analysis (TGA) was done to investigate the weight loss of wood during pyrolysis. Scanning electron microscopy (SEM) and energy dispersive x-ray (EDX) analysis were used to analyze the characteristics of the biomorphic silicon carbide. The density was determined by Archimedes method whereas Vickers hardness test was used to investigate the mechanical properties of the SiC. A homogenous microstructure was found in dense SiC consisting less than 1μm diameter of pores. The density and hardness of the samples were found to be increase as the holding time was increased. It was found that the conversion rate of carbon into SiC was improved with the increase in holding time.

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The effect of porous carbon preform and the infiltration process on the properties of reaction-formed SiC

Cited by 142 publications

References 17 publications

Mechanical properties of wood-derived silicon carbide aluminum-alloy composites as a function of temperature

Mechanical properties of wood-derived silicon carbide aluminum-alloy composites as a function of temperature

Influence of uni and bi-modal SiC composition on mechanical properties and microstructure of reaction-bonded SiC ceramics

Conversion of biomorphic silicon carbide from wood powders carbon template

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