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247. Joining of AlN to Ceramic Bonded Carbon for Heat Dissipating Substrates.

Author

Chen, Weiwu, Tojo, Tetsuro, and Miyamoto, Yoshinari

Subjects
CERAMIC materials, ENERGY dissipation, SUBSTRATES (Materials science), CARBON composites, THERMAL expansion, THERMAL conductivity, STRENGTH of materials
Abstract

Ceramic bonded carbon ( CBC) is a new composite consisting of carbon particles bonded with thin ceramic boundaries. It can not only reinforce carbon but also provide joining capability with other materials. To obtain light-weight heat dissipating substrates with matched low coefficients of thermal expansion, a top layer of AlN and a bottom layer of AlN/ CBC (20 vol% AlN) were sintered and joined in one step by hot-pressing at 1950°C. Both AlN and AlN/ CBC were densified and bonded tightly. AlN/ CBC has a density of 2.30 g/cm3, bending strength of 112 MPa, and thermal conductivity of 170 W/mK. The obtained AlN-AlN/ CBC plates showed a high strength as a result of the direct AlN-AlN sintering at the AlN and AlN/ CBC interface. [ABSTRACT FROM AUTHOR]

Published
2012
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248. SiC Ceramic-Bonded Carbon Fabricated With Si3N4 and Carbon Powders.

Author

Chen, Weiwu, Tojo, Tetsuro, and Miyamoto, Yoshinari

Subjects
CERAMICS, SINTERING, TEMPERATURE, THERMAL conductivity, BENDING (Metalwork), CARBON, SILICON carbide, POWDERS
Abstract

New composites called ceramic-bonded carbon ( CBCs), consisting of a three-dimensional structure of carbon particles bonded with thin ceramic boundaries, were developed. To fabricate light and tough CBCs and to understand their reinforcing mechanism, Si3N4 and carbon powders (25:75 in volume ratio) were gelcasted and then sintered by spark plasma sintering at temperatures of 1700-1900°C. The ceramic boundary of SiC was formed in situ at above 1700°C by the reaction of Si3N4 and C. The sintered CBCs showed a unique microstructure consisting of carbon particles and ceramic boundaries of 15 μm in size and 0.5-3 μm in thickness, respectively. With an increase in sintering temperature, physical bonding of ceramic grains to the carbon particles was enhanced as the grain growth of SiC increased. The SiC/ CBCs sintered at 1900°C were highly dense (97% theoretical density), lightweight (2.36 mg/m3), and had both relatively high bending strength and thermal conductivity (135 MPa and 140 W/mK, respectively). [ABSTRACT FROM AUTHOR]

Published
2012
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249. Densification and properties of AlN ceramic bonded carbon

Author

Chen, Weiwu, Miyamoto, Yoshinari, Tojo, Tetsuro, and Naito, Makio

Subjects
*ALUMINUM nitride, *CERAMICS, *CARBON composites, *SINTERING, *THERMAL conductivity, *STRENGTH of materials, *TEMPERATURE effect, *MICROSTRUCTURE
Abstract

Abstract: To obtain light and tough materials with high thermal conductivity, AlN ceramic bonded carbon (AlN/CBC) composites were fabricated at temperatures from 1600 to 1900°C in a short period of 5min by the spark plasma sintering technique. All AlN/CBCs (20vol% AlN) have unique microstructures containing carbon particles of 15μm in average size and continuous AlN boundary layers of 0.5–3μm in thickness. With an increase in sintering temperature, AlN grains grow and anchor into carbon particles, resulting in the formation of a tight bonding layer. The AlN/CBC sintered at 1900°C exhibited a light weight (2.34g/cm3), high bending strength (100MPa), and high thermal conductivity (170W/mK). [Copyright &y& Elsevier]

Published
2012
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250. Identification of a quantitative trait locus for spontaneous osteoarthritis in STR/ort mice.

Author

Watanabe, Ken, Oue, Yasuhiro, Miyamoto, Yoshinari, Matsuura, Makiko, Mizuno, Yusuke, and Ikegawa, Shiro

Subjects
OSTEOARTHRITIS, GENETICS, LABORATORY mice, CARTILAGE, SCANNING electron microscopy, GENOMES
Abstract

Osteoarthritis (OA) is the most common joint disorder in humans. Most of the animal models of OA were developed by surgical destabilization of joints or through transgenic approaches, and information from naturally occurring models of OA is very limited. The mouse strain STR/ort is recognized as a spontaneous model of OA. This mouse is unique in that it develops late onset cartilage degeneration of the tibio-femoral joint, similar to human OA. The purpose of this study was to identify quantitative trait loci (QTL) for the OA phenotype in STR/ort. Whereas the trait had been reported to be recessive, a significant population of the F1 generation exhibited OA phenotype. Thus, backcrossed (BC) mice generated by crossing F1 male to C57BL/6N female mice were used for genetic analysis. Degeneration of articular cartilage in BC mice was evaluated by scanning electron microscopy. Linkage analysis was carried out using microsatellite markers covering the entire genome. Cartilage degeneration in STR/ort mice was a polygenic trait. A QTL for the OA phenotype was mapped to a region 20 centimorgans proximal to the centromere of chromosome 4 (LOD = 3.37, p = 0.0065). A QTL associated with the onset of cartilage degeneration in C57BL/6N mice was also identified on chromosome 5 (LOD = 3.04, p = 0.0147). These results suggest that multiple loci are involved in the OA phenotype in mice. © 2011 Orthopaedic Research Society Published by Wiley Periodicals, Inc. J Orthop Res 30:15-20, 2012 [ABSTRACT FROM AUTHOR]

Published
2012
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