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Influence of stabilizer (Li2O) on the sintering density and ionic conductivity of K-β/β''-aluminas
임성기,Woo-Sung Kim,Jae-Ho Shin,Seok-Jun Kim,Hee-Min Kim 한양대학교 세라믹연구소 2007 Journal of Ceramic Processing Research Vol.8 No.4
Sintering of K-β-aluminas in the system K2O-Al2O3-Li2O was carried out at atmospheric pressure. The influence of Li2O as a stabilizer on densification and ionic conductivity, depending on its content, has been investigated. In order to lower the sintering temperature, the calcined powders were ultra-fine milled by an attrition mill. Relations between sintering density, microstructure and ionic conductivity were studied. The samples were prepared in the molar ratio range [K2O]:[Al2O3]=1:5- 1:11, and the Li2O content was varied from 0 to 1.6 wt%. The maximum ionic conductivity has been observed with the sample having a molar ratio of [K2O]:[Al2O3]=1:5 and containing 0.8 wt% of stabilizer. This sample showed 97% density and its ionic conductivity was measured to be 1.1×10−1 and 5×10−3 S/cm at 800 oC and 300 oC, respectively. Sintering of K-β-aluminas in the system K2O-Al2O3-Li2O was carried out at atmospheric pressure. The influence of Li2O as a stabilizer on densification and ionic conductivity, depending on its content, has been investigated. In order to lower the sintering temperature, the calcined powders were ultra-fine milled by an attrition mill. Relations between sintering density, microstructure and ionic conductivity were studied. The samples were prepared in the molar ratio range [K2O]:[Al2O3]=1:5- 1:11, and the Li2O content was varied from 0 to 1.6 wt%. The maximum ionic conductivity has been observed with the sample having a molar ratio of [K2O]:[Al2O3]=1:5 and containing 0.8 wt% of stabilizer. This sample showed 97% density and its ionic conductivity was measured to be 1.1×10−1 and 5×10−3 S/cm at 800 oC and 300 oC, respectively.
임성기,김진,임명택,고병천,Im, Seong-Gi,Kim, Jin,Im, Myeong-Taek,Go, Byeong-Cheon 대한기계학회 1992 大韓機械學會誌 Vol.32 No.9
1990년도에 들어서 여러 선진공업국에서의 전기자동차 개발사업은 큰 진전을 보이고 있다. 고 성능 전지 및 경량모터의 개발, 그리고 각종 신소재들에 의한 차량의 경량화와 더불어 전기자 동차 기술수준은 급성장을 이루었다. 국내 자동차업체들도 1998년도부터 미국 캘리포니아주에서 실행될 전기자동차 강제판매 규정에 대응하기 위하여 최근들어 본격적으로 전기자동차 개발에 착수하였다. 이 글을 통하여 전기자동차개발의 배경 및 현재 각국의 개발현황, 그리고 예상 시 장규모 및 파급효과를 여러측면에서 조사하였다. 지금과 같은 개발추세로 진행된다면 앞으로 10년정도 후면 가솔린 자동차와 대등한 성능과 가격의 전기자동차개발도 가능하리라 예측된다.