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Research on Measurement of Curie Temperature of Alumel Ferromagnetic Materials |
ZHOU Jin-yan,ZHANG Gui-jun,ZHANG Ying-yuan,HUA Xiu-bing,LIN Keng,HUANG Yan-jie,CHEN Ling |
Guangdong Provincial Institute of Metrology, Guangzhou, Guangdong 510405, China |
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Abstract The Alumel ferromagnetic material, which has a stable Curie temperature, is usually used as a standard material for thermal analysis temperature calibration. The selection of the raw material of Alumel, the test of raw material composition, the influence of composition difference on the Curie temperature, and the measurement of Curie temperature method were systematically introduced. After the instrument was calibrated with traceable temperature certified reference materials, the indium melting point reference material was selected as the external standard according to the Curie temperature of Alumel, which made the Curie temperature traceable to SI units. The national certified reference material GBW(E)130668(Curie temperature: 161.6 ℃,U=2.1℃,k=2) was tested, and the test value was 161.8℃. The test result was within the uncertainty range of the certified value.
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Received: 22 April 2022
Published: 13 January 2023
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