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RISS 인기검색어
- 검색키워드
- 저자 : KwangBoShim (검색결과 3 건)
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Sintering of attrition-milled TiN powders using a spark plasma sintering technique
KwangBoShim,KyoungHunKim,JaeHongChae,JongHanWon 한양대학교 세라믹연구소 2002 Journal of Ceramic Processing Research Vol.3 No.3
Poorly sinterable TiN powders have been fully densified using a spark plasma sintering (SPS) technique. Sintering characteristics and microstructural evolution during SPS processing were evaluated using electron microscopy. It was found that Al2O3 incorporated as a contaminant during the milling process reacted with TiN particles at temperatures above 1700oC to form a secondary phase containing Al2O3 that accelerated the mass transport. This secondary phase makes it possible to start sintering at a lower temperature. It also enables the growth of TiN grains to be controlled. This phenomenon could be confirmed by the presence of the round or curved grain boundaries and the presence of Al2O3 containing secondary phase clusters in grain boundary triple junctions.
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Thermoelectric properties of silicon hexaboride prepared by spark plasma sintering method
KwangBoShim,KyoungHunKim,J.Matsushita,K.Niihara,KeunHoAuh,DaeWoongLee 한양대학교 세라믹연구소 2002 Journal of Ceramic Processing Research Vol.3 No.3
Silicon hexaboride is attractive for various industrial applications because of its high temperature capability, high hardness and excellent electrical conductivity, in particular it is a promising material for use as a thermoelectric semiconductor at high temperature. We have used a spark plasma sintering technique to produce silicon hexaboride ceramics. The Seebeck coefficient, electrical conductivity and thermal conductivity were measured and the effect of additives, phase composition and microstructure on the thermoelectric properties were discussed. The approximate value of Z (figure of merit value) of the SPS specimen reached about 9.6×10-6/K at 1273 K. The thermoelectric properties (Z) of the SPS specimen are improved in comparison with the specimen by hot-pressing. The effect of the addition of lanthanum and boron on thermoelectric properties of SiB6 were also evaluated.
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Cementitiuous materials for crack self-healing concrete
Kwang Bo Shim 한양대학교 세라믹연구소 2015 Journal of Ceramic Processing Research Vol.16 No.S1
The serviceability and durability of concrete structures has been extensively studied by various researchers. Cementitious materials and concrete are the most widely used in construction site. However, cracking is a well-known phenomenon in concrete engineering. Concrete repairs are inevitable to enhance its service life which evokes additional expenditure separate to the building cost. Therefore, one of the most important issues is to seal cracks which occur due to drying shrinkage or exposed to external factors. Many researchers have already studied this topic with the intent to control cracking or develop a crack-free concrete. Two alternatives for crack control have been proposed; these include methodologies for either controlling residual stresses or developing ductile concrete. Recently, a lot of researchers are studied various crack control methods and concepts to achieve self-healing phenomenon in past decades. In this review paper, autogenous healing in cementitious materials is reported based on various articles, activity of JCI TC-075B (Japan Concrete Institute Technical Committee 075B), JCI TC-091A (Japan Concrete Institute Technical Committee 091A) and RILEM TC-SHC (Self-healing Phenomena in Cement Based Materials of (International Union of Laboratories and Experts in Construction Materials,Systems and Structures)).
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