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황성식,박상환,한재호,한경섭,김찬목,Hwang, Sung-Sic,Park, Sang-Whan,Han, Jae-Ho,Han, Kyung-Sop,Kim, Chan-Mook 한국세라믹학회 2002 한국세라믹학회지 Vol.39 No.10
차세대 발전 시스템에서 사용되는 고온 가스 필터용 지지층 소재를 제조하기 위하여 용융 Si 침윤 방법으로 기공율이 32∼36%, 주기공 크기가 37∼90 ${\mu}m$ 범위를 갖는 고강도 다공질 반응소결 탄화규소(RBSC)를 개발하였다. 반응소결 탄화규소 다공체의, 최대 파괴강도는 120MPa이었으며, 용융 Si 침윤 방법으로 제조된 반응소결 탄화규소 다공체에서는 SiC 입자 사이에 SiC/Si로 이루어진 기지상이 형성되어 있기 때문에 파괴 강도 및 열충격 특성이 점토 결합 탄화규소 다공체 보다 우수하였다. 반응소결 탄화규소 다공체의 기공율 및 기공 크기는 잔류 Si의 양 및 성형체에 사용한 SiC 입자 크기에 따라 다르게 나타났다. Porous reaction bonded SiC with high fracture strength was developed using Si melt infiltration method for use of the support layer in high temperature gas filter that is essential to develop the next generation power system such as integrated gasification combined cycle system. The porosity and pore size of porous RBSC developed in this study were in the range of 32∼36% and 37∼90 ${\mu}m$ respectively and the maximum fracture strength of porous RBSC fabricated was 120 MPa. The fracture strength and thermal shock resistance of porous RBSC fabricated by Si melt infiltration were much improved compared to those of commercially available porous clay bonded SiC due to the formation of the strong SiC/Si interface between SiC particles. The characteristics of pore structure of porous RBSC was varied depending on the amounts of residual Si as Well as the size of SiC particle used in green body.
가압 소결법으로 합성된 Ti<sub>3</sub>SiC<sub>2</sub> 소결체의 기계적 특성
조경선,황성식,권혁보,박상환,Cho, Gyoung-Sun,Hwang, Sung-Sic,Kwon, Huck-Bo,Park, Sang-Whan 한국세라믹학회 2010 한국세라믹학회지 Vol.47 No.6
Nano laminated bulk $Ti_3SiC_2$ was synthesized by hot press process using TiCx/Si powder mixture at the temperature range of $1300^{\circ}C\sim1500^{\circ}C$. pure $Ti_3SiC_2$ was synthesized by a hot pressing above $1400^{\circ}C$, while unreacted TiCx were remained in bulk $Ti_3SiC_2$ which synthesized below $1400^{\circ}C$. The sintering density of bulk $Ti_3SiC_2$ were varied with the amount of TiCx. It was found that the mechanical properties and micro structures of bulk $Ti_3SiC_2$ were closely related to the amounts of TiCx which was controlled by the hot pressing temperature. The TiCx increase the flexural strength of bulk $Ti_3SiC_2$, while the fracture toughness and thermal shock resistance of bulk $Ti_3SiC_2$ were decreased with the content of TiCx. The plastic deformations of bulk $Ti_3SiC_2$ were appeared above $1000^{\circ}C$.
Hwang, Sung Sic,Park, Sang Whan,Cho, Seong Jai,Lee, Dong Bok Trans Tech Publications, Ltd. 2005 Materials science forum Vol.486 No.-
<P>The contact fracture behaviors of fine-grained Ti3SiC2 and coarse-grained high purity Ti3SiC2 are examined by the Hertzian indentation and Vickers indentation technique. The Vickers hardness of bulk Ti3SiC2 is as low as 5.3~6.3 Gpa, and the Hertzian contact stress-strain curves for Ti3SiC2 deviate much from linearity, which resembles the fracture behavior of a ductile metal rather than a brittle ceramic. The contact damages by both Vickers indentation and Hertzian indentation reveal a fairly good plastic deformation nature of Ti3SiC2. Un-reacted TiCx in fine-grained Ti3SiC2 may impede the plastic deformation by slip along basal plan inside Ti3SiC2 grain, making Ti3SiC2 less plastic under loading.</P>
Kim, Kwang Joo,Eom, Jung-Hye,Kim, Young-Wook,Seo, Won-Seon,Lee, Mi-Jai,Hwang, Sung Sic Elsevier 2017 CERAMICS INTERNATIONAL Vol.43 No.6
<P><B>Abstract</B></P> <P>A polycrystalline SiC ceramic prepared by pressureless sintering of α-SiC powders with 3vol% Al<SUB>2</SUB>O<SUB>3</SUB>-AlN-Y<SUB>2</SUB>O<SUB>3</SUB> additives in an argon atmosphere exhibited a high electrical resistivity of ~10<SUP>13</SUP> Ωcm at room temperature. X-ray diffraction revealed that the SiC ceramics consisted mainly of 6H- and 4H-SiC polytypes. Scanning electron microscopy and high resolution transmission electron microscopy investigations showed that the SiC specimen contained micron-sized grains surrounded by an amorphous Al-Y-Si-O-C-N film with a thickness of ~4.85nm. The thick boundary film between the grains contributed to the high resistivity of the SiC ceramic.</P>
고병철,이지환,유연철,전정식,김경택 대한금속재료학회(대한금속학회) 1994 대한금속·재료학회지 Vol.32 No.12
Tensile and wear-resistance properties were studied on SiC particle reinforced Al-12Si eutectic alloy(AC8A) composites. The Al-Si alloy was produced by gas atomization process and the composites were fabricated by powder metallurgy route. On hot extrusion process, at an extrusion ratio of 25 : 1 and at 500℃, the Si precipitates and SiC particles were not fractured. During tensile tests the Si precipitates which were Larger than 4㎛ were fractured and the degree of fracture of SiC particles was small. As the Vol.% of SiC increased the fracture sources of the composites were varied from internal cracks of Si precipitates or decohesion of interfaces between SiC and matrix to separation of SiC particles within agglomeration regions. After thermal expousure the width of wear was increased with increasing exposure temperature and time. The wear mode was varied from abrasive wear to delamination wear with increasing SiC volume fraction.
SiC 입자강화 Al-14Fe 복합재료의 고온변형 특성
유연철,전정식,이준선 대한금속재료학회(대한금속학회) 1994 대한금속·재료학회지 Vol.32 No.3
Continuous hot torsion tests of 10vol%SiC_P/Al-14Fe composites were performed in the range of 350∼530℃ and 1.15×10^(-3)∼1.15×10^(-1)/sec. Flow curves of the hot torsion tests were analysed with respect to the characteristics of work hardening rate θ, dynamic recrystallization (DRX) and constitutive equation. The critical strain (ε_c) for DRX initiation was determined from changes in slope of the strain hardening rate -effective stress (θ-σ) curves, and it was decreased with increasing temperature and strain rate. Although the SiC particles helped the initiation of DRX, they also retarded dynamic recrystallization progress. Relationship between critical strain and peak strain (ε_P) was found to be ε_c = 0.51 ε_P. The stress dependence on the strain rate (ε˙) and temperature (T) could be described by hyperbolic sine relationship, ε˙=2.21×[sinh(1.92×10^(-2)·σ)]^(4.7)exp(-193.5 kJ/RT). The microstructural development during hot deformation were interpreted by dynamically recrystallized structures which were composed of equiaxed grains, subgrains and dislocation tangles.
CHARACTERISTICS OF FABRICATED SiC RADIATION DETECTORS FOR FAST NEUTRON DETECTION
Lee, Cheol-Ho,Kim, Han-Soo,Ha, Jang-Ho,Park, Se-Hwan,Park, Hyeon-Seo,Kim, Gi-Dong,Park, June-Sic,Kim, Yong-Kyun The Korean Association for Radiation Protection 2012 방사선방어학회지 Vol.37 No.2
Silicon carbide (SiC) is a promising material for neutron detection at harsh environments because of its capability to withstand strong radiation fields and high temperatures. Two PIN-type SiC semiconductor neutron detectors, which can be used for nuclear power plant (NPP) applications, such as in-core reactor neutron flux monitoring and measurement, were designed and fabricated. As a preliminary test, MCNPX simulations were performed to estimate reaction probabilities with respect to neutron energies. In the experiment, I-V curves were measured to confirm the diode characteristic of the detectors, and pulse height spectra were measured for neutron responses by using a $^{252}Cf$ neutron source at KRISS (Korea Research Institute of Standards and Science), and a Tandem accelerator at KIGAM (Korea Institute of Geoscience and Mineral Resources). The neutron counts of the detector were linearly increased as the incident neutron flux got larger.