Oxidation bonding of porous silicon carbide ceramics

A oxidation-bonding technique was successfully developed to fabricate porous SiC ceramics using the powder mixtures of SiC, Al₂O₃ and C. The oxidation-bonding behavior, mechanical strength, open porosity and pore-size distribution were investigated as a function of Al₂O₃ content as well as graphite...

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Bibliographic Details
Published inJournal of materials science Vol. 37; no. 17; pp. 3615 - 3622
Main Authors She, J. H, Deng, Z. Y, Daniel-doni, J, Ohji, T
Format Journal Article
LanguageEnglish
Published Heidelberg Kluwer Academic Publishers 01.09.2002
Springer
Springer Nature B.V
Subjects
Aluminum oxide
Applied sciences
Bonding strength
Building materials. Ceramics. Glasses
Ceramic bonding
Ceramic industries
Ceramic powders
Ceramics
Ceramics industry
Chemical industry and chemicals
Exact sciences and technology
Fracture strength
graphene
Graphite
Materials science
Miscellaneous
Oxidation
Oxidation resistance
Particle size
Particle size distribution
Pore size
Porosity
Porous silicon
Silicon carbide
Technical ceramics
Weibull modulus
Open cell porosity
Mechanical properties
Experimental study
Porous material
Powder
Non oxide ceramics
Bending strength
Pore size
Silicon Carbides
Sintering
Oxidation
Manufacturing
Microstructure
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Summary:A oxidation-bonding technique was successfully developed to fabricate porous SiC ceramics using the powder mixtures of SiC, Al₂O₃ and C. The oxidation-bonding behavior, mechanical strength, open porosity and pore-size distribution were investigated as a function of Al₂O₃ content as well as graphite particle size and volume fraction. The pore size and porosity were observed to be strongly dependent on graphite particle size and volume fraction. In contrast, the degree of SiC oxidation was not significantly affected by graphite particle size and volume fraction. In addition, it was found that the fracture strength of oxidation-bonded SiC ceramics at a given porosity decreases with the pore size but increases with the neck size. Due to the enhancement of neck growth by the additions of Al₂O₃, a high strength of 39.6 MPa was achieved at a porosity of 36.4%. Moreover, such a porous ceramic exhibited an excellent oxidation resistance and a high Weibull modulus.
Bibliography:http://dx.doi.org/10.1023/A:1016596805717
ISSN:0022-2461
1573-4803
DOI:10.1023/A:1016596805717