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round robin Study on the Thermal Conductivity/Diffusivity of a Gold Wire with a Diameter of 30μm tested via Five Measurement Methods

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Journal of Thermal Science 2022年第4期31卷 1037-1051页

作者： ABE Ryo SEKIMOTO Yuki SAINI Shirkant MIYAZAKI Koji LI Qin-Yi LI Dawei TAKAHASHI Koji YAGI Takashi NAKAMURA Masakazu division of materials science nara institute of science and technologyikoma 630-0192japan department of mechanical and control engineering kyushu institute of technologykitakyushu 804-8550japan department ofaeronautics and astronautics kyushu universityfukuoka819-0395japan international institute for carbon-neutral energy research(wpi-i2cner) kyushu universityfukuoka 819-0395japan national metrology institute of japan national institute of advanced industrial science and technology tsukuba 305-8565japan

Since first establishing thermal measurement techniques for micrometer-scale wires,various methods have been devised and improved upon.However,the uncertainty of different measurements on the same sample has not yet been discussed.In this work,a round robin test was performed to compare the thermal conductivity and thermal diffusivity measurement methods for a fine metal wire.The tested material was a pure gold wire,with a diameter of 30μm.The wire was cut into certain lengths and distributed to four institutions using five different measurement methods:the direct current(DC)self-heating method,the DC heating T-type method,the 3ωmethod for thermal conductivity,the scanning laser heating alternating current(AC)method,and the spot periodic heating radiation thermometry method for thermal diffusivity.After completing the measurements,the reported thermal conductivity and thermal diffusivity at room temperature,i.e.,317 W·m^(-1)·K^(-1)and 128×10^(-6)m^(2)·s^(-1),respectively,were adopted as references for comparison with the measurement results.The advantages and disadvantages of each method are described in terms of the effect of electrical and thermal junctions fabricated on a wire,such as an electrode,a thermocouple,and a heat bath.The knowledge obtained from the tested methods will be useful for selecting and designing a measurement technique for various wire-like materials.

关键词： thermal conductivity thermal diffusivity round robin test microscale wire

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China’s participation in the international RRT for I_(c) measurement of superconducting cables organized by IEC/TC90

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Superconductivity 2022年第1期1卷 27-33页

作者： J.Li Y.Shi G.M.Zhang L.W.Jing J.X.Zheng C.L.Liu W.Yuan Y.S.Wang M.Song Y.J.Xia X.H.Zong Y.W.Han D.N.Zheng X.J.Zhou T.Matsushita G.Nishijima The Institute of Physics Chinese Academy of SciencesBeijing 100190China The Institute of Electrical Engineering Chinese Academy of SciencesBeijing 100190China The Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China Eastern Superconductor Science&Technology(Suzhou)Co LtdSuzhou 215299China Guangdong Power Grid Corporation Guangzhou 510630China Shanghai International Superconductor Technology Co LtdShanghai 200444China Department of Computer Science and Electronics Kyushu Institute of Technology Iizuk1Japan National Institute for Materials Scienc5 Tsukuba 305-0003Japan

Currently,IEC/TC90 is working on standardizing the method for measuring critical current(Ic)in superconducting cables.At the end of 2020,an international round robin test(RRT)was organized,in which five Chinese institutions participated,and four accomplished the test.The electric-field versus current(E-I)curves obtained by each institution are highly repeatable.Those obtained by different institutions are nearly identical after appropriate curve averaging,indicating high reproducibility,except the last participant's inner core curves.The discrepancy was later determined to be the result of sample cable damage.After excluding highly deviated data,it is determined that the maximum relative standard uncertainty in I_(c) is 0.7%,and the maximum relative standard uncertainty in n-value is 12.8%.The I_(c)values are comparable to Japan's domestic RRT results,but the n-values are significantly different.The test results support the DC four-terminal method as a recommended test method,with a target relative uncertainty of less than 2%for the Ic value.

关键词： Superconducting cable round robin test Standardization

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