Measurement of electrical conductivity and resistivity of Cu-Nb18% microcomposite conductor and its welded joint
Abstract
Systems generating strong magnetic fields are widely used in modern fundamental and applied research as well as in the most innovative industrial processes. These devices generate magnetic fields that reach 5–100 T and the conductors are subjected to a huge Lorentz force, so the conductor material must be extremely strong (UTS ≥ 700 MPa) and have a good specific electrical conductivity (IACS ≥ 60%). Since traditional conductors such as copper, aluminum, gold, and silver cannot withstand such loads, microcomposite materials have been developed that are characterized by such high strength and good specific electrical conductivity. This paper reviews the specific electrical conductivity and specific electrical resistance characteristics of conductor and factors affecting them, methods of measuring these electrical characteristics as well as properties of Cu-Nb18% microcomposite conductor. This paper also describes the methodology for measuring the specific electrical conductivity and specific electrical resistance of the Cu-Nb18% microcomposite conductor solid and with welded joint (welded by using butt welding). The comparison of application possibilities of used methodologies and obtained characteristics was carried out.
Article in Lithuanian.
Cu-Nb 18 % mikrokompozitinio laidininko ir jo virintinių jungčių elektrinio laidumo ir savitosios elektrinės varžos matavimo ypatumai
Santrauka
Šiuolaikiniuose fundamentiniuose, taikomuosiuose tyrimuose bei inovatyviausiuose industriniuose procesuose yra plačiai taikomi stiprių magnetinių laukų sistemos. Šie įrenginiai generuoja magnetinius laukus, kurie siekia 5–100 T, o laidininkai yra veikiami didžiulės Lorentzo jėgos, todėl laidininkų medžiaga turi būti itin tvirta (UTS ≥ 700 MPa) ir turėti gerą savitąjį elektrinį laidumą (IACS ≥ 60 %). Kadangi tradiciniai laidininkai tokie kaip varis, aliuminis, auksas, sidabras negali atlaikyti tokių apkrovų, buvo sukurtos mikrokompozitinės medžiagos, kurios pasižymi dideliu stipriu ir turi gerą savitąjį elektrinį laidumą. Šiame darbe apžvelgiamos laidininkų savitojo elektrinio laidumo bei savitosios elektrinės varžos charakteristikos, jiems įtaką darantys veiksniai, šių elektrinių charakteristikų matavimo metodikos, Cu-Nb 18 % mikrokompozitinio laidininko savybės. Taip pat šiame darbe yra aprašomos Cu-Nb 18 % mikrokompozitinio laidininko su virintine jungtimi (pagaminta taikant sandūrinį kontaktinį suvirinimą) ir vientiso Cu-Nb 18 % laidininko savitojo elektrinio laidumo ir savitosios elektrinės varžos matavimo metodikos, atliktas metodikų taikymo galimybių ir gautų charakteristikų palyginimas.
Reikšminiai žodžiai: elektrinis laidumas, savitoji elektrinė varža, Cu-Nb mikrokompozitiniai laidininkai, virintinės jungtys, matavimai.
Keyword : electrical conductivity, specific electrical resistance, Cu-Nb microcomposite conductors, welded joints, measurements
This work is licensed under a Creative Commons Attribution 4.0 International License.
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