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열경화성 분석을 위한 가속열화 된 Chlorosulfonated Polyethylene의 경년특성 연구
신용덕(Yong-Deok Shin) 대한전기학회 2017 전기학회논문지 Vol.66 No.5
The accelerated thermal ageing of CSPE (chlorosulfonated polyethylene) was carried out for 16.82, 50.45, and 84.09 days at 110℃, equivalent to 20, 60, and 100 years of ageing at 50℃ in nuclear power plants, respectively. As the accelerated thermally aged years increase, the insulation resistance and resistivity of the CSPE decrease, and the capacitance, relative permittivity and dissipation factor of those increase at the measured frequency, respectively. As the accelerated thermally aged years and the measured frequency increase, the phase degree of response voltage vs excitation voltage of the CSPE increase but the phase degree of response current vs excitation voltage decrease, respectively. As the accelerated thermally aged years increase, the apparent density, glass transition temperature and the melting temperature of the CSPE increase but the percent elongation and % crystallinity decrease, respectively. The differential temperatures of those are 0.013-0.037℃ and,0.034-0.061℃ after the AC and DC voltages are applied to CSPE-0y and CSPE-20y, respectively; the differential temperatures of those are 0.011-0.038℃ and 0.002-0.028℃ after the AC and DC voltages are applied to CSPE-60y and CSPE-100y, respectively. The variations in temperature for the AC voltage are higher than those for the DC voltage when an AC voltage is applied to CSPE. It is found that the dielectric loss owing to the dissipation factor(tanδ) is related to the electric dipole conduction current. It is ascertained that the ionic (electron or hole) leakage current is increased by the partial separation of the branch chain of CSPE polymer as a result of thermal stress due to accelerated thermal ageing.
가속열화 된 CSPE의 경화특성에 미치는 해수 담수 침지의 영향
신용덕(Yong-Deok Shin),이정우(Jeong-U Lee) 대한전기학회 2016 전기학회논문지 Vol.65 No.5
The accelerated thermal aging of CSPE (chlorosulfonated polyethylene) was carried out for 33.64 and 67.27 days at 110[°C], equivalent to 40 and 80 years of aging at 50[°C], respectively. These samples were referred to as CSPE-0y, CSPE-40y and CSPE-80y, respectively. As the accelerated thermally aged years of the CSPE increase, the insulation resistance[Ω] at 20[Hz], 500[Hz], and 2[KHz], and the percent elongation [%EL] of the CSPE decrease. However, the dissipation factor(tanδ) at 20[Hz], 500[Hz], and 2[KHz], the apparent density[g/㎤], the glass transition temperature and the melting temperature of the CSPE were increased. The period of time that the voltage has to be applied until electric breakdown of the CSPE-0y is longer than that of the CSPE-40y, and the CSPE-80y, but the dielectric strength of the CSPE-80y is lower than that of the CSPE-0y and the CSPE-40y. The differential temperatures after the AC and DC voltages are applied to CSPE-0y, CSPE-40y and CSPE-80y are 0.026∼0.028[℃], 0.030∼0.042[℃], 0.018∼0.045[℃], respectively. The variations of temperature for the AC voltage are higher than those for the DC voltage when an AC voltage is applied to CSPE-0y, CSPE-40y and CSPE-80y. It is found that the dielectric loss owing to the dissipation factor[tanδ] is related to the electric dipole conduction current. It is ascertained that the ionic (electron or hole) leakage current is increased by the separation of the branch chain of CSPE polymer from the main chain of the polyethylene as a result of thermal stress due to accelerated thermal aging as well as by conducting ions such as Na<SUP>+</SUP>, Cl<SUP>-</SUP>, Mg<SUP>2+</SUP>,SO₄<SUP>2-</SUP>, Ca<SUP>2+</SUP>and K<SUP>+</SUP> after seawater soaking.
신용덕(Yong-Deok Shin),주진영(Jin-Young Ju),김철호(Cheol-Ho Kim),이희승(Hee-Seung Lee),고태헌(Tae-Hun Ko),이정훈(Jung-Hoon Lee) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
The composites were fabricated by adding 30, 35, 40,45vol.% Zirconium Diboride(ZrB₂) powders as a second phase to Silicon Carbide(SiC) matrix. The physical, mechanical and electrical properties of electroconductive SiC-ZrB₂ ceramic composites by Spark Plasma Sintering(SPS) were examined. the relative density of SiC+30vol.%ZrB₂, SiC+35vol.%ZrB₂, SiC+40vol.%ZrB₂, and SiC+45vol.%ZrB₂ composites are 88.64, 76.80, 79.09, and 88.12%, respectively. The XRD phase analysis of the electroconductive SiC-ZrB₂ ceramic composites not observed reactions between β-SiC and ZrB₂, and reveals high of SiC and ZrB₂ , and low of ZrO₂ phase. The electrical resistivity of SiC+30vol.%ZrB₂, SiC+35vol.%ZrB₂, SiC+40vol.%ZrB₂, and SiC+45vol.%ZrB₂ composites are 6.74×10?⁴, 4.56×10?³, 1.92×10?³, and 4.95×10?³Ω · ㎝ at room temperature, respectively. And all of that have Positive Temperature Coefficient Resistance(PTCR) in temperature range from 25℃ to 500℃
방전플라즈마 소결에 의한 SiC-ZrB₂ 도전성 세라믹 복합체 특성
신용덕(Yong-Deok Shin),주진영(Jin-Young Ju),조성만(Sung-Man Jo),이정훈(Jung-Hoon Lee),김철호(Cheol-Ho Kim),이희승(Hee-Seung Lee) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
The composites were fabricated by adding 0, 15, 20, 25[vol.%] Zirconium Diboride(hereafter, ZrB₂) powders as a second phase to Silicon Carbide(hereafter, SiC) matrix. The physical, mechanical and electrical properties of electroconductive SiC ceramic composites by spark plasma sintering(hereafter, SPS) were examined. Reactions between β-SiC and ZrB₂ were not observed in the XRD analysis The relative density of mono SiC, SiC+15[vol.%]ZrB₂, SiC+20[vol.%]ZrB₂ and SiC+25[vol.%]ZrB₂ composites are 90.97[%], 74.62[%], 77.99[%] and 72.61[%] respectively. The XRD phase analysis of the electroconductive SiC ceramic composites reveals high of SiC and ZrB₂ and low of ZrO₂ phase. The electrical resistivity of mono SiC, SiC+15[vol.%]ZrB₂, SiC+20[vol.%]ZrB₂ and SiC+25[vol.%]ZrB₂ composites are 4.57×10?¹, 2.13×10?¹, 1.53×10?¹ and 6.37×10?²[Ω · ㎝] at room temperature, respectively. The electrical resistivity of mono SiC, SiC+15[vol.%]ZrB₂, SiC+20[vol.%]ZrB₂ and SiC+25[vol.%]ZrB2 are Negative Temperature Coefficient Resistance(hereafter, NTCR) in temperature ranges from 25[℃] to 100[℃]. It is convinced that SiC+20[vol.%]ZrB₂ composite by SPS can be applied for heater above 1000[℃].