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<p>NTC thermistors have broad application prospects, and low-temperature sintering of NTC thermistors is of great significance in reducing sintering costs and is beneficial for preparing multi-layer structured components with lower cost internal electrode conductors. In this work, a low-melting point compound basing on Y<sub>2</sub>Ba<sub>2</sub>Cu<sub>2</sub>O<sub>7</sub> is selected as sintering agent for the preparation of Li-doped Ni–Zn–O (Ni<sub>0.97-<i>x</i></sub>Zn<sub><i>x</i></sub>Li<sub>0.03</sub>O<sub>2</sub>, <i>x</i> = 0.1, 0.3, 0.5, 0.7) ceramic thermistors. The sintering temperature can be reduced by more than 250&#xa0;°C comparing with the one of the related ceramics without sintering aid (NiO ceramics was sintered at 1400&#xa0;°C). The fabricated Li-doped Ni–Zn–O ceramics consist of single salt-rock NiO phase for <i>x</i> ≤ 0.3 and are composed of NiO-rich and ZnO-rich phases for <i>x</i> = 0.5 or 0.7. All ceramics show typical NTC characteristics with a wide-range adjustable material constant (<i>B</i> values ranging from 756 to 4967&#xa0;K). The Ni–Zn–O ceramics have high aging stability with the resistance shift rates induced at 125&#xa0;°C lower than 1.89%. The microstructure, conduction modes and aging mechanism were investigated using the XRD, SEM, XPS, and electrochemistry impedance spectra.</p>

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Preparation and characterization of Ni–Zn–O ceramics with Y2Ba2Cu2O7 as sintering aids for NTC thermistors

  • 期刊论文

  • 发表日期：

    2025年2月5日

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  • Hanxiao Wang,
  • Hong Zhang,
  • Mei Li,
  • You Zhang,
  • Zhicheng Li,
  • Senlin Leng

摘要

NTC thermistors have broad application prospects, and low-temperature sintering of NTC thermistors is of great significance in reducing sintering costs and is beneficial for preparing multi-layer structured components with lower cost internal electrode conductors. In this work, a low-melting point compound basing on Y2Ba2Cu2O7 is selected as sintering agent for the preparation of Li-doped Ni–Zn–O (Ni0.97-xZnxLi0.03O2, x = 0.1, 0.3, 0.5, 0.7) ceramic thermistors. The sintering temperature can be reduced by more than 250 °C comparing with the one of the related ceramics without sintering aid (NiO ceramics was sintered at 1400 °C). The fabricated Li-doped Ni–Zn–O ceramics consist of single salt-rock NiO phase for x ≤ 0.3 and are composed of NiO-rich and ZnO-rich phases for x = 0.5 or 0.7. All ceramics show typical NTC characteristics with a wide-range adjustable material constant (B values ranging from 756 to 4967 K). The Ni–Zn–O ceramics have high aging stability with the resistance shift rates induced at 125 °C lower than 1.89%. The microstructure, conduction modes and aging mechanism were investigated using the XRD, SEM, XPS, and electrochemistry impedance spectra.