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Mn_(0.43)Ni_(0.9)CuFe_(0.67)O_4 NTC热敏材料的Pechini法制备及微波烧结特性研究
靳先静; 常爱民; 张惠敏; 张东炎
Source Publication无机材料学报


Other Abstract

In order to obtain the NTC thermistors with small B constant (about 1900 K), applied to wide temperature range, Mn0.43Ni0.9CuFe0.67O4 NTC thermistor materials prepared by Pechini method were microwave-calcined at different temperatures (650°C, 750°C and 850°C). The calcined Mn0.43Ni0.9CuFe0.67O4 powders were pressed and then sintered at 1000°C in a microwave furnace (multimode cavity, 2.45 GHz). The crystal structure, phase compositions, morphology and particle size distribution of the samples were analyzed by FT-IR, X-ray diffraction (XRD), scanning electron microscope (SEM) and a laser particle size analyzer. The experimental results show that the electrical properties of the ceramics are strongly dependent on the calcination and sintering process. The application of microwave leads to a lower calcination temperature (650°C) and densified uniform microstructures. Microwave sintering can obtain the components with well uniformity of B constant and resistivity, of which the Bavg. is 1930 K (deviation of 0.31%) and resistivity ρavg. is 135 Ω·cm (deviation of 4.55%). However, the Bavg. is 1720 K (deviation of 1.47%) and resistivity ρavg. is 78 Ω·cm (deviation of 25.34%) for the conventionally sintered components. From complex impedance analysis, the grain resistance (Rb) and grain boundary resistance (Rgb) are respectively 255 Ω and 305 Ω for the microwave-sintered samples. The Rb and Rgb are respectively 200 Ω and 230 Ω for conventionally sintered samples.

Keyword微波烧结 微波煅烧 Ntc Pechini法
Indexed BySCI ; CSCD
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GB/T 7714
靳先静,常爱民,张惠敏,等. Mn_(0.43)Ni_(0.9)CuFe_(0.67)O_4 NTC热敏材料的Pechini法制备及微波烧结特性研究[J]. 无机材料学报,2009,24(5):1013-1018.
APA 靳先静,常爱民,张惠敏,&张东炎.(2009).Mn_(0.43)Ni_(0.9)CuFe_(0.67)O_4 NTC热敏材料的Pechini法制备及微波烧结特性研究.无机材料学报,24(5),1013-1018.
MLA 靳先静,et al."Mn_(0.43)Ni_(0.9)CuFe_(0.67)O_4 NTC热敏材料的Pechini法制备及微波烧结特性研究".无机材料学报 24.5(2009):1013-1018.
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