복합전이금속 (Ni, Co, Mn) 기반 스피넬계 산화물의 소결 거동 및 온도센서 특성 연구
Sintering behavior and electrical properties of transition metal (Ni, Co, Mn) based spinel oxides for temperature sensor applications
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초록
스피넬계 산화물 중 (Nix, Mny, Co3-x-y)O4(NMC)는 부온도계수 온도센서 소재로 활용되어 전기자동차용 배터리 관리시스템을 포함한 다양한 산업적 응용이 가능하다 . 일반적으로 NMC는 Ni, Mn, Co 화합물 분말을 이용하여 고상반응법을 통해 제조되는데 이 중 소결 공정을 통한 치밀화 과정이 온도센서 소재의 온도에 따른 전기적 특성을 결정하는 중요한 인자로 알려져있다. 본 연구에서는 NMC 펠렛을 고상반응법을 통해 제조하고 결정구조 및 미세구조를 관찰하였다. 또한, 소결 과정 동안의 치밀화 거동 분석을 위한 활성화 에너지를 도출하였다. 분석 결과에 따르면 , NMC 펠렛의 상온 저항은 10.03 Kohm이었으며 센서민감도인 B-value는 3601.8 K로 다양한 산업군에 온도센서로 적용이 가능할 것으로 기대된다. 또한, 치밀화를 위한 활성화 에너지는 273.3±0.4kJ/mol로 도출되었으며, 이는 소결 과정의 열역학적 특성을 이해하는데 중요한 정보를 제공할 것으로 기대된다.
Abstract
The spinel-type oxide (Nix, Mny, Co3xy)O4 (NMC) is widely utilized as a material for temperature sensors with a negative temperature coefficient (NTC), finding applications across various industries including electric vehicle battery management systems. Typically, NMC is manufactured using solid-state reaction methods employing powders of Ni, Mn, and Co compounds, with the densification process through sintering recognized as a crucial factor determining the electrical properties of the temperature sensor material. In this study, NMC pellets were synthesized via solid-state reaction and their crystallographic and microstructural characteristics were investigated. Also, the activation energy for densification behavior during the sintering process was determined. According to the analysis results, the room temperature resistance of the NMC pellets was measured at 10.03 Kohm, with the sensitivity parameter, B-value, recorded at 3601.8 K, indicating their potential applicability as temperature sensors across various industrial fields. Furthermore, the activation energy for densification was found to be 273.3±0.4 kJ/mol, providing valuable insights into the thermodynamic aspects of the sintering process of the NMC.
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