The impact of dispersants on the electrical performance consistency of NTC thermistors

IF 2.8 4区 工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC
Chong Wang, Wei Ma, Junchang Wang, Shuangjiang He, Xiao Zhang, Sen Liang
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Abstract

The consistency of electrical properties is an important factor for the industrial applications of negative temperature coefficient (NTC) thermistors. Spinel-type NTC thermistors typically consist of several transition metal elements. However, variations in the fabrication process can compromise the uniformity of these elemental components, resulting in electrical properties. This study investigates the impact of adding dispersants on the consistency of the microstructure and electrical properties of the Mn–Fe–Co–Zn–O-based NTC thermistors. Thermistors prepared using a solid-state process exhibited a more uniform distribution of elements when two dispersants ammonium citrate and polyether P123 were incorporated during the ball milling stage. The coefficients of variation of room-temperature resistivity (ρ25) and material constants (B25/50) for samples prepared without dispersants were 17.433% and 0.667%, respectively. In contrast, samples prepared with dispersants exhibited coefficients of variation ranging from 7.763 to 11.796% for ρ25 and 0.299% to 0.392% for B25/50. This demonstrates a more uniform distribution of ρ25 and B25/50 following the addition of dispersants. Therefore, the use of dispersants enhances material’s compositional organization, leading to improved consistency in its electrical properties. These findings have significant implications for the development and application of NTC thermistors.

分散剂对 NTC 热敏电阻电气性能一致性的影响
电气性能的一致性是负温度系数(NTC)热敏电阻工业应用的一个重要因素。尖晶石型 NTC 热敏电阻通常由多种过渡金属元素组成。然而,制造工艺的变化会影响这些元素成分的均匀性,从而影响电气性能。本研究探讨了添加分散剂对 Mn-Fe-Co-Zn-O 型 NTC 热敏电阻微观结构一致性和电气性能的影响。在球磨阶段加入柠檬酸铵和聚醚 P123 这两种分散剂后,采用固态工艺制备的热敏电阻的元素分布更加均匀。未加入分散剂的样品的室温电阻率(ρ25)和材料常数(B25/50)的变化系数分别为 17.433% 和 0.667%。相比之下,使用分散剂制备的样品,ρ25 的变异系数为 7.763% 至 11.796%,B25/50 的变异系数为 0.299% 至 0.392%。这表明添加分散剂后,ρ25 和 B25/50 的分布更加均匀。因此,使用分散剂可增强材料的成分组织,从而提高其电气性能的一致性。这些发现对 NTC 热敏电阻的开发和应用具有重要意义。
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来源期刊
Journal of Materials Science: Materials in Electronics
Journal of Materials Science: Materials in Electronics 工程技术-材料科学:综合
CiteScore
5.00
自引率
7.10%
发文量
1931
审稿时长
2 months
期刊介绍: The Journal of Materials Science: Materials in Electronics is an established refereed companion to the Journal of Materials Science. It publishes papers on materials and their applications in modern electronics, covering the ground between fundamental science, such as semiconductor physics, and work concerned specifically with applications. It explores the growth and preparation of new materials, as well as their processing, fabrication, bonding and encapsulation, together with the reliability, failure analysis, quality assurance and characterization related to the whole range of applications in electronics. The Journal presents papers in newly developing fields such as low dimensional structures and devices, optoelectronics including III-V compounds, glasses and linear/non-linear crystal materials and lasers, high Tc superconductors, conducting polymers, thick film materials and new contact technologies, as well as the established electronics device and circuit materials.
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