Spark Plasma Sintering of Negative Temperature Coefficient Thermistor Ceramics

Chang, Aimin; Zhang, Bo; Wu, Yiquan; Zhao, Qing; Zhang, Jincheng Yao Huimin; Xu, Jinbao; Zhao, Pengjun

doi:10.5772/59030

Cited by 1 publication

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References 34 publications

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“…Sintering is a grain growth-induced densification process enabled by atomic diffusion (solid-state reactions) under the driving force of heat energy. To achieve thermistors with high density and minimal porosity, high sintering temperatures and long dwell times are generally employed in the conventional sintering process [ 10 , 11 , 12 ]. However, at such high temperatures, the spinel structure becomes unstable and decomposes into rock salt (NiO) and Mn-rich spinel phases [ 10 , 11 , 13 , 14 ], resulting in the deterioration of the electrical performance.…”

Section: Introductionmentioning

confidence: 99%

Solution Synthesis of Cubic Spinel Mn–Ni–Cu–O Thermistor Powder

2021

Materials

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Toward the development of NTCR thermistors, nanocrystalline Mn–Ni–Cu–O powder was synthesized from a mixed chloride aqueous solution by a simple co-precipitation method.The introduction of an oxidizing agent (H2O2) into the solution led to the partial oxidation of Mn2+ ions into Mn3+ ions, which enabled the collected powder to be well crystallized at 650 °C. Such a low calcining temperature resulted in fine particles with a mean size of 60 nm, which significantly promoted densification of the resulting ceramics. As a result, a dense and homogenous microstructure with a relative density up to 97.2% was achieved for pellets sintered at 1100 °C. Furthermore, these sintered ceramics exhibited a room temperature resistivity (ρ25) of 67 Ω·cmand a thermistor constant (B25/85) of 2843 K, which make them suitable for use in industrial thermistors. In addition, electrical stability was greatly improved when the ceramics were prepared by a new two-step sintering method. The results suggest that the co-precipitation route with the introduction of H2O2 is suitable for the fabrication of cubic spinel thermistor nanopowders.

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Section: Introductionmentioning

confidence: 99%

Solution Synthesis of Cubic Spinel Mn–Ni–Cu–O Thermistor Powder

2021

Materials

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Spark Plasma Sintering of Negative Temperature Coefficient Thermistor Ceramics

Cited by 1 publication

References 34 publications

Solution Synthesis of Cubic Spinel Mn–Ni–Cu–O Thermistor Powder

Solution Synthesis of Cubic Spinel Mn–Ni–Cu–O Thermistor Powder

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