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조동언,박경국,김동원,정길도,한병성 한국전기전자재료학회 1998 전기전자재료학회논문지 Vol.11 No.12
In this paper, to fabricate a superconducting fault current limiter(FCL) of thick film type, $YBa_2Cu_3O_X superconducting thick films were fabricated by surface diffusion process using the screen printing method. Powder mixture of $3BaCuO_2$+2CuO was screen printed on $Y_2BaCuO_5$(d=15mm). And critical current densities of the thick films were observed as the sintering temperature(92$0^{\circ}C$~95$0^{\circ}C$) and holding time(2h~10h). Based on experimental data, the thick films for superconducting FCL were sintered at $940^{\circ}C$ in 2 hours. The superconducting FCL with a current limiting area of 1mm wide and 66mm long was prepared on $Y_2BaCuO_5$ substrate. To measure the characterization of the fabricated FCL, an alternating voltage (60Hz) was applied to the FCL in 77K liquid nitrogen. At an applied voltage of 4V, the FCL was limited from 20A into 0.6A not farther than 0.5ms.
조동언,임성훈,강형곤,한병성 전북대학교 공업기술연구소 1997 工學硏究 Vol.28 No.-
YBa_2Cu_3O_x bulks were fabricated by MPMG(Melt Powdered melt Growth). As the initial compositions, the rations of mixed powders were prepared as follow; YBa_2Cu_3O_x : Y_2BaUcO_5 = 1:0, 1:0.2, 1:0.3, 1:0.4 After the first cooling, Ag powders with 5wt%, 10wt%, 15wt% and 20wt% were added to the obtained powders, respectively. The critical current densities on the differential amount of y_2BaCuO_5 and Ag addition for YBa_2Cu_3O_x were investigated. Those of bulks increased with increasing the amount of Y_2BaCuO_5 and Ag. The critical current density of the bulk of 1 : 0.4 higher 7 times than that of pure Y_1Ba_2Cu_3O_x smaple.
MPMG 공정을 이용한 입자크기별 고온초전도 후막의 특성분석
최명호,조동언,조병서,한병성 전북대학교 공업기술연구소 1997 工學硏究 Vol.28 No.-
YBCO thick films using the melt-powder-melt-growth(MPMG) method were fabricated to achieve high critical current density. The ratio of mixed powders is YBa_2Cu_3O : Y_2BaCuO = 1 : 0.4. The highest critical temperature showed 87 K in a particle size of 63μm. Also, we have fabricated the painted Y-Ba-Cu-O thick films on the alumina oxide substrates by the same process dependent on size of particles. The sizes and the number of voids increased with increasing that of particles.
차폐유도형 고온초전도 전류제한기의 설계 및 특성시뮬레이션
임성훈,김병숙,조동언,임석진,한병성 전북대학교 공업기술연구소 1998 工學硏究 Vol.29 No.-
In this paper, the characteristics of the shielded inductive superconducting gault current limiter was simulated and analyzed. After determining parameters of design for superconducting tube, iron core and primary coil, simple power system composed of shielded inductive FCL was simulated by the numerical analysis. The currents flowing under the fault condition could be limited below 50 A successfully. It was suggested that as the important facters of operational characteristics, the turns of primary coil and size of iron core play a major role for whether the shieldde inductive SCFCL operated as inductive type or resistive type FCL.
용융온도와 유지시간이 용융법으로 제작한 고온초전도체의 임계특성에 미치는 영향
임성훈,한태희,박경국,임성우,조동언,한병성,Lim, Sung-Hun,Han, Tae-Hee,Park, Kyung-Kuk,Yim, Seong-Woo,Cho, Dong-Eon,Han, Byoung-Sung 한국전기전자재료학회 1998 전기전자재료학회논문지 Vol.11 No.2
The effects of melting temperature and holding time on the critical current density($J_c$) of $YBa_2Cu_3O_x$ based superconducting bulk fabricated by MPMG process were investigated. The amount of the formed $Y_2BaCuO_5$ phases increased with the melting temperature. However, the value of critical current density was highest at 1120 $^{\circ}C$. With this proper melting temperature, the effect of holding time on the critical characteristics was also investigated. In the case of Ag addition, the volume of the formed $Y_2BaCuO_5$ phase when the amount of Ag addition was 10 wt% and 20 wt% was observed to be highest at 20 minute and 40 minute respectively. But in the specimen without Ag, volume of $Y_2BaCuO_5$ phase increased as the holding time increased. The proper melting temperature and the holding time obtained were 1120 $^{\circ}C$ and 20 minute. The long holding time was not effective for the $J_c$ improvement as well as the formation of $Y_2BaCuO_5$.