• 제목/요약/키워드: Materials Technology

검색결과 27,668건 처리시간 0.053초

ANALYSIS OF SrTiO$_3$STEP-FLOW GROWTH BY RHEED

  • Shin, Dong-Suk;Lee, Ho-Nyung;Kim,Yong-Tae;Chol, In-Hoon;Kim, Chang-Jung;Kim, T.Y.;Lee, J.K.;Chung, Il-Sub
    • 한국재료학회:학술대회논문집
    • /
    • 한국재료학회 1998년도 IUMRS-ICEM ABSTRACT BOOK
    • /
    • pp.65.2-65
    • /
    • 1998
  • PDF

Evaluation of Static Spring Constant and Accelerated Life Prediction for Compression Set of Polyurethane Resilient Pad in Rail Fastening System

  • Lee, Seung-Won;Park, Jun-Young;Park, Eun-Young;Ryu, Sung-Hwan;Bae, Seok-Hu;Kim, Nam-Il;Yun, Ju-Ho;Yoon, Jeong-Hwan
    • Elastomers and Composites
    • /
    • 제53권4호
    • /
    • pp.220-225
    • /
    • 2018
  • Resilient pads play a major role in reducing the impact of loads on a rail in a rail-fastening system, which is essentially used for a concrete track. Although a compression set test is commonly used to measure the durability of a resilient pad, the static spring constant is often observed to be different from the fatigue test. In this study, a modified compression set test method was proposed to monitor the variations in the compression set and static spring constant of a resilient pad with respect to temperature and time. In addition, the life of the resilient pad was predicted by performing an acceleration test based on the Arrhenius equation.

Modeling, Preparation, and Elemental Doping of Li7La3Zr2O12 Garnet-Type Solid Electrolytes: A Review

  • Cao, Shiyu;Song, Shangbin;Xiang, Xing;Hu, Qing;Zhang, Chi;Xia, Ziwen;Xu, Yinghui;Zha, Wenping;Li, Junyang;Gonzale, Paulina Mercedes;Han, Young-Hwan;Chen, Fei
    • 한국세라믹학회지
    • /
    • 제56권2호
    • /
    • pp.111-129
    • /
    • 2019
  • Recently, all-solid-state batteries (ASSBs) have attracted increasing interest owing to their higher energy density and safety. As the core material of ASSBs, the characteristics of the solid electrolyte largely determine the performance of the battery. Thus far, a variety of inorganic solid electrolytes have been studied, including the NASICON-type, LISICON-type, perovskite-type, garnet-type, glassy solid electrolyte, and so on. The garnet Li7La3Zr2O12 (LLZO) solid electrolyte is one of the most promising candidates because of its excellent comprehensively electrochemical performance. Both, experiments and theoretical calculations, show that cubic LLZO has high room-temperature ionic conductivity and good chemical stability while contacting with the lithium anode and most of the cathode materials. In this paper, the crystal structure, Li-ion transport mechanism, preparation method, and element doping of LLZO are introduced in detail based on the research progress in recent years. Then, the development prospects and challenges of LLZO as applied to ASSBs are discussed.

재료기술혁신의 원천에 관한 연구 (Study on the Sources of Materials Technology Innovation)

  • 채재우;조규갑;김정흠
    • 기술혁신학회지
    • /
    • 제8권2호
    • /
    • pp.732-756
    • /
    • 2005
  • This paper attempts to find the sources of materials technology innovation and to analyze the relationships between the sources and materials technology innovation. Starting from the traditional hypothesis on the innovation sources (e.g. technology-push, demand-pull and user-supplier), materials scientific knowledges, materials processing technologies and users' needs are found as three main sources of innovation in materials technology. There are not only close interactions between the sources and materials innovation, but also the interactions among the sources of innovations play important roles for materials technology innovation. This paper discusses the characteristics of interactions between sources of innovation in materials technology. This study on the sources and interactions among sources may provide important information for policymaking in materials technology

  • PDF