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高壓燒結(jié)對Bi-2223/Ag高溫超導(dǎo)帶材臨界電流與力學(xué)性能的影響
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國家“863”高技術(shù)研究發(fā)展計劃項目 (2008AA030601, 2009AA03Z202)；中央高?；究蒲袠I(yè)務(wù)費(fèi)科研專項“研究生科技創(chuàng)新基金”項目 (CDJXS10131156)


Effects of Controlled Over-Pressure Sintering on the Critical Current and Mechanical Properties of Bi-2223/Ag Tape
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    摘要:

    研究了高壓燒結(jié)對Bi-2223/Ag高溫超導(dǎo)帶材臨界電流以及力學(xué)性能的影響。結(jié)果表明：高壓燒結(jié)使帶材的臨界電流提升了30%，抗拉強(qiáng)度提升到104 MPa，帶材臨界彎曲應(yīng)變從0.54%提升到0.91%。采用XRD常規(guī)掃描、Omega掃描以及SEM等手段分析了帶材電學(xué)性能和力學(xué)性能提升的原因。實驗結(jié)果發(fā)現(xiàn)：高壓燒結(jié)有利于Bi-2223相的形成，從而使Bi-2223的相含量增加，殘余的Bi-2212相的含量減少；常壓燒結(jié)和高壓燒結(jié)后的帶材中Bi-2223相晶粒的半高寬分別為6.5°和5.6°說明高壓燒結(jié)的帶材中的Bi-2223晶粒排列更加整齊；此外，通過觀察帶材的縱截面發(fā)現(xiàn)高壓燒結(jié)使帶材內(nèi)部更加致密。正是三方面的共同作用大幅度提升了帶材的臨界電流以及力學(xué)性能

    Abstract:

    The influences of controlled over-pressure sintering on the critical current density and mechanical properties of the Bi-2223/Ag high-temperature superconducting tape have been investigated. XRD and SEM were used to analyze the reasons of the improvement of the tape’s properties. The results show that the critical current density of the tape is promoted by more than 30% while the tensile strength and critical bending strain are improved to 104 MPa and 0.91% respectively. The Bi-2223 content is increased and the FWMH value of the tape is lowered from 6.5° to 5.6° by the controlled over-pressure sintering process. Besides, the densities of the ceramic cores are improved. Due to the higher Bi-2223 content, better grain alignment and higher core density, the critical current density and mechanical property are improved

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陳興品,余曉偉,劉 猛,孫海波,鄭 軍,劉 慶.高壓燒結(jié)對Bi-2223/Ag高溫超導(dǎo)帶材臨界電流與力學(xué)性能的影響[J].稀有金屬材料與工程,2013,42(3):607~610.[Chen Xingpin, Yu Xiaowei, Liu Meng, Sun Haibo, Zheng Jun, Liu Qing. Effects of Controlled Over-Pressure Sintering on the Critical Current and Mechanical Properties of Bi-2223/Ag Tape[J]. Rare Metal Materials and Engineering,2013,42(3):607~610.]
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  • 收稿日期:2012-02-20
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