|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals, and Materials
||Aging Behaviour in Ni0.5CoxMn2.5-xO4 (x=0.5, 0.8 and 1.1) Thermistors
||Gökhan Hardal, Berat Yüksel Price
|On-Site Speaker (Planned)
Negative temperature coefficient (NTC) thermistors is required to have the electrical stability under external factors for many domestic and industrial applications. The aging phenomenon of NTC thermistors can be described as the increasing in electrical resistance of materials under thermal stress with time. In this study, Ni<SUB>0.5</SUB>Co<SUB>x</SUB>Mn<SUB>2.5-x</SUB>O<SUB>4</SUB> (x=0.5, 0.8 and 1.1) ceramics were fabricated by the conventional solid-state reaction method. The powder mixture of high purity manganese, cobalt and nickel oxides was ball-milled for 5 hours. The powders were calcinated at 900<SUP>o</SUP>C for 2 hours. The samples were sintered at 1100<SUP>o</SUP>C for 5 hours in air. To investigate the effect of the aging process, the samples were held at 150<SUP>o</SUP>C for 400 hours. Aging in the samples were calculated by the following equation; ∆R/R<SUB>0</SUB> = (R − R<SUB>0</SUB>)/R<SUB>0</SUB> in which R<SUB>0</SUB> is the resistivity at 25<SUP>o</SUP>C before the aging test, and R is the resistivity at 25<SUP>o</SUP>C after aging test.
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