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액장 소결한 $\beta-SiC-TiB_2$계 전도성 복합체의 특성
임승혁,신용덕,송준태,Yim, Seung-Hyuk,Shin, Yong-Deok,Song, Joon-Tae 대한전기학회 2000 전기학회논문지C Vol.52 No.10
The mechanical and electrical properties of the hot-pressed and annealed $\beta-SiC-TiB_2$ electroconductive ceramic composites were investigated as a function of the liquid forming additives of Al_2O_3+Y_2O_34. The result of phase analysis of composites by XRD revealed $\alpha-SIC(6H)\;TiB_2,\; and YAG(Al5Y3O12) crystal phase. The relative density and the mechanical properties of composites were increased with increasing $Al_2O_3+Y_2O_34 contents because YAG of reaction between $Al_2O_3\; and\; Y_2O_3$ was increased. The Flexural strength showed the highest value of 432.5MPa for composites added with 12wt% $Al_2O_3+Y_2O_34 additives at room temperature. Owing to crack deflection crack bridging phase transition and TAG of fracture toughness mechanism the fracture toughness showed 7.1MPa.m1/2 for composites added with 12wt% $Al_2O_3+Y_2O_34 additives at room temperature. The electrical resistivity and the resistance temperature coefficient showed the lowest of $6.0\times10-4\Omega.cm\; and\; 3.1\times10-3/^{\circ}C4 respectively for composite added with 12wt% \Omega additives at room temperature. The electrical resistivity of the composites was all positive temperature coefficient resistance (PTCR) in the temperature range of $25^{\circ}C\; to\; 700^{\circ}C$.
$Al_2O_3+Y_2O_3를 첨가한 {\beta}-SiC-TiB_2$ 복합체의 특성
임승혁,신용덕,주진영,윤세원,송준태,Yim, Seung-Hyuk,Shin, Yong-Deok,Ju, Jin-Young,Yoon, Se-Won,Song, Joon-Tae 대한전기학회 2000 전기학회논문지C Vol.49 No.7
The mechanical and electrical properties of pressed and annealed $\beta-SiC-TiB_2$ electroconductive ceramic composites were investigated as a function of the liquid forming additives of $Al_2O_3+Y_2O_3$. Phase analysis of composites by XRD revealed $\alpha$-SiC(6H), TiB2, and (Al5Y3O12). Reaction between Al2O3 and $Y_2O_3$ formed YAG but the relative density decreased with increasing $Al_2O_3+Y_2O_3$ contents. The Flexural strength showed the value of 458.9 MPa for composites added with 4 wt% $Al_2O_3+Y_2O_3$ additives at room temperatures. Owing to crack deflection and crack bridging, the fracture toughness showed 6.2, 6.0 and 6.6 MPa.m1/2 for composites added with 4, 8 and 12 wt% Al2O3+Y2O3 additives respectively at room temperature. The resistance temperature coefficient showed the value of $3.6\times10^{-3},\; 2.9\times10^{-3}\; and\; 3.0\times10^{-3} /^{\circ}C$</TEx>$^{\circ}C$ for composite added with 4, 8 and 12 wt% $Al_2O_3+Y_2O_3$additives respectively at room temperature. The electrical resistivity of the composites was all positive temperature coefficient resistance(PTCR) in the temperature range of $25^{\circ}C\; to\; 700^{\circ}$.
液狀 燒結에 의한 ${\beta}$-SIC TiB$_2$系 導電性 複合體의 特性(Ⅱ)
신용덕,임승혁,송준태,Shin, Yong-Deok,Yim Seung-Hyuk,Song Joon-Tae 대한전기학회 2001 전기학회논문지C Vol.50 No.6
The mechanical and electrical properties of the hot-pressed and annealed ${\beta}-SiC-TiB_2$, electroconductive ceramic composites were investigated as function as functions of the liquid forming additives of $Al_2O_3+Y_2O_3$. The result of phase analysis of composites by XRD revealed ${\alpha}$-SiC(6H), $TiB_2$,, and YAG($Al_5Y_3O_{12}$) crystal phase. The relative density and the mechanical properties of composites were increased with increasing $Al_2O_3+Y_2O_3$ contents in pressureless annealing method because YAG of reaction between $Al_2O_3$ was increased. The flexural strength showed the highest value of 458.9 MPa for composites added with 4 wt% $Al_2O_3+Y_2O_3$ additives in pressed annealing method at room temperature. Owing to crack deflection, crack bridging, phase transition and YAG of fracture toughness mechanism, the fracture toughness showed 7.1 MPa ${\cdot}\;m^{1/2}$ for composites added with 12 wt% $Al_2O_3+Y_2O_3$ additives in pressureless annealing method at room temperature. The electrical resistivity and the resistance temperature coefficient showed the lowest value of $6.0{\times}10^{-4}\;{\Omega}\;{\cdot}\;cm(25\'^{\circ}C}$ and $3.0{\times}10^{-3}/^{\circ}C$ for composite added with 12 wt% $Al_2O_3+Y_2O_3$ additives in pressureless annealing method at room temperature, respectively. The electrical resistivity of the composites was all positive temperature coefficient resistance(PTCR) in the temperature ranges from 25 $^{\circ}C$ to 700 $^{\circ}C$.
청해부대 파병 기간동안 호발하는 질환과 그 발생에 영향을 미치는 요인 분석
이성 ( Lee Sung ),임승혁 ( Yim Seung Hyuk ),박상헌 ( Park Sang Hun ) 국군의무사령부 2020 대한군진의학학술지 Vol.51 No.1
Objectives; the purpose of this research is to obtain a high prevalence disease list during the deployment period of the cheong-hae unit and do an analysis of factors affecting incidence rate. Methods; 301 Navy Crews were deployed for 201 days, total medical records were retrospectively utilized, and we compared the disease’s incidence rates with that of the general population. Independent variables are age, department, exercise time, smoking, bed place, duty schedule, and clinic visit period. To Compare the variables, we used х<sup>2</sup> test and Logistic Regression Test. Results; Most high prevalence disease was upper respiratory disease, which was linked to the clinic visit period. and sleep problem was revealed to be the most high risk ratio compared to the general population. Trauma and musculoskeletal diseases show no difference among clinic visit period but we observed very high incidence rate in ‘Cooking Department’. Duty schedule has a correlation to Gastro-intestinal Disease. smoking is revealed risk factor of dental problem and head & neck musculoskeletal disease. Conclusions; There are many factors affecting a disease’s incidence rate. This findings offer basic reference for preparing Cheong-hae unit deployment and enhancing the Navy Crew’s health by preventing the high prevalence disease.