Study of a Ceramic Thermocouple for Al Production

L.C. Feng; Liang Zhen; Wen Zhu Shao; N. Xie

doi:10.4028/www.scientific.net/MSF.546-549.2195

Paper Titles

Crystallographic Texture of MgO and its Effect on the Growth of BaTiO₃ Thin Films by RF Sputtering
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Sintering of β-Si₃N₄ Powder Prepared by Self-Propagating High-Temperature Synthesis (SHS)
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Fuzzy Dynamic Model of a Giant Magnetostrictive Actuator
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Molecular Dynamics Study of the Structure in Vitreous Silica with COMPASS Force Field at Elevated Temperatures
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Study of a Ceramic Thermocouple for Al Production
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Adaptive Vibration Control on Six Degree-of-Freedom Magnetostrictive Smart Structure
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Magnetostriction and Hysteresis of (Tb,Dy,Ho)Fe₂ Alloys
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The Growth Mechanism of Quasi One-Dimensional ZnO Nanostructures Synthesized by Carbon Reduction without Catalyst
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Low-Temperature Sintering and Dielectric Properties of (Zn_1-xMg_x)TiO₃
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HomeMaterials Science ForumMaterials Science Forum Vols. 546-549Study of a Ceramic Thermocouple for Al Production

Study of a Ceramic Thermocouple for Al Production

Abstract:

A ceramic thermocouple (CTC) was assembled using SiC as the cathode and MoSi2 as the anode for the temperature test of the aluminum electrolysis. The NiFe2O4 was sprayed on the surface of SiC cathode for increasing the corrosion resistance ability in the cryolite. The corrosion behavior of NiFe2O4 in the cryolite was investigated. The results of the corrosion tests show that the NiFe2O4 has a very low corrosion rate in the cryolite, and a corrosion layer was formed during the corrosion test. The mechanisms of the NiFe2O4 corrosion are reactive corrosion and particles flaking. The thermo emf of SiC-MoSi2 CTC was tested from 25 °C to 1300 °C in air. The results show that thermo emf has a linear relationship with the temperature dependence, and reached 350 mV at 1300 °C. The CTC which consists of SiC-MoSi2 prepared in the same batch has a preferable interchangeability. By holding temperature at 1300 °C, the deviation of thermo emf is 0.5 %, which is better than the criterion of industry thermocouple, 0.75 %. The CTC response time was also analyzed.