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“雙粉法”制備Bi—2223/Ag帶材中CaCuO2最佳含量的確定
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TM262

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“九五”863超導(dǎo)技術(shù)資助項(xiàng)目(863-CD010000)


Optimization of CaCuO2 Content in Bi-2223/Ag Tape Made by Two-Powder Process
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    摘要:

    采有“雙粉法”制備Bi-2223/Ag帶材,通過(guò)對(duì)2212和CaCuO2的不同配比研究,確定了雙粉法中CaCuO2的最佳含量,實(shí)驗(yàn)結(jié)果表明:當(dāng)前驅(qū)粉中CaCuO2相過(guò)量5%時(shí),帶材的臨界電流密度比CaCuO2無(wú)過(guò)量時(shí)高10%左右。這主要是因?yàn)樵诜磻?yīng)過(guò)程中,過(guò)量的CaCuO2會(huì)提供較豐富的液相,促使2212→2223轉(zhuǎn)變過(guò)程進(jìn)行得更徹底。且轉(zhuǎn)變速度提高;但過(guò)量值較大(10%~15%)時(shí),過(guò)多的液相會(huì)導(dǎo)致雜相的偏聚,大尺寸的雜相粒子使其周?chē)?223相織克構(gòu)度,晶粒連接性較差,帶材的臨界電流密度下降。

    Abstract:

    CaCuO 2 content has been optimized for two powder process. The experimental results indicate that as precursor powders have 5% excessive CaCuO 2, the critical current density of tape increases about 10%. During the reaction process, excessive CaCuO 2 afford enough liquid phase which accelerate the 2223 phase formation, but too much CaCuO 2 (>15%) will produce impure phases at grain boundary. Large impurity particles decrease the texture degree of the 2223 phase and critical current density of the tape.

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周紅光 李成山 等.“雙粉法”制備Bi—2223/Ag帶材中CaCuO2最佳含量的確定[J].稀有金屬材料與工程,2001,(1):61~64.[Zhou Hongguang. Optimization of CaCuO2 Content in Bi-2223/Ag Tape Made by Two-Powder Process[J]. Rare Metal Materials and Engineering,2001,(1):61~64.]
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  • 最后修改日期:2000-02-15
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