STANFORD IN-SITU HIGH RATE YBCO PROCESS: TRANSFER TO METAL TAPES AND PROCESS SCALE UP

Malcolm R. Beasley ; Robert H.Hammond

关键词: ABSORPTION;    CONTROL;    CONVERSION;    COST;    CRITICAL CURRENT;    CURRENTS;    ENERGY;    EVAPORATION;    GROWTH;    INCLUSIONS;    LASERS;    LIQUIDS;    MAGNETIC FIELDS;    MATERIALS;    METALS;    MONITORING;    MOTORS;    OXYGEN;    PARTIAL PRESSURE;    PHYSICAL VAPOR DEPOSITION;    PHYSICS;    POTENTIALS;    POWER;    POWER GENERATION;    PROCESSING;    REFLECTIVITY;    SYNTHESIS;    TEMPERATURE RANGE 0400-1000 K;    THIN FILMS;    TRANSFORMERS Superconductor;    YBCO;    Coated Condiuctor;    High Rate Process;   

DOI  :  10.2172/951094
RP-ID  :  DOE/OE/14510
PID  :  OSTI ID: 951094
Others  :  Other: Stanford Sponsored Projects Office No. 27862
Others  :  TRN: US201002%%1466

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来源: SciTech Connect

【 摘 要 】

Executive Summary The materials science understanding of high rate low cost processes for Coated Conductor will benefit the application to power utilities for low loss energy transportation and power generation as well for DOD applications. The research in this program investigated several materials processing approaches that are new and original, and are not being investigated elsewhere. This work added to the understanding of the material science of high rate PVD growth of HTSC YBCO assisted by a liquid phase. A new process discovered uses amorphous glassy precursors which can be made at high rate under flexible conditions of temperature and oxygen, and later brought to conditions of oxygen partial pressure and temperature for rapid conversion to YBCO superconductor. Good critical current densities were found, but further effort is needed to optimize the vortex pinning using known artificial inclusions. A new discovery of the physics and materials science of vortex pinning in the HTSC system using Sm in place of Y came at growth at unusually low oxygen pressure resulting in clusters of a low or non superconducting phase within the nominal high temperature phase. The driving force for this during growth is new physics, perhaps due to the low oxygen. This has the potential for high current in large magnetic fields at low cost, applicable to motors, generators and transformers. The technical demands of this project were the motivation for the development of instrumentation that could be essential to eventual process scale up. These include atomic absorption based on tunable diode lasers for remote monitoring and control of evaporation sources (developed under DARPA support), and the utility of Fourier Transform Infrared Reflectivity (FTIR) for aid in the synthesis of complex thin film materials (purchased by a DURIP-AFOSR grant).