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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 $Y_2BaCuO_5$.
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.