Ni-Zn-O based thermal sensitive ceramic and its preparing method

A ceramic material, heat-sensitive technology, applied in the field of material science, can solve the problems of complex composition, cost reduction and competitiveness, and achieve the effect of easy process, cheap raw materials, and wide application.

Inactive Publication Date: 2006-06-07
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As early as 1930, Germany first used uranium oxide to make a negative temperature coefficient semiconductor thermistor; at present, most of the existing NTC thermistors are ternary systems such as Ni 0.66 Zn x mn 2.34-x o 4 system, Co-Mn-Ni-O system, Co-Mn-Ni-O system and Ni-Mn-Cu-O system, etc., the composition is mostly complex, and some systems use more expensive raw materials such as Mn-In- Ni-O system
And in the case of fierce competition in the current market, the cost problem will greatly reduce its competitiveness

Method used

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  • Ni-Zn-O based thermal sensitive ceramic and its preparing method
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  • Ni-Zn-O based thermal sensitive ceramic and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 14.621g of Ni 2 o 3 and 0.379g of ZnO, so that the molar ratio is 0.95:0.05. It was wet ball milled for 20 hours. The mixture was washed and then dried at 80°C to obtain a uniformly mixed ceramic powder. Grind and sieve the powder, add 3wt% PVA binder, dry press at about 4Mpa, and sinter in air at 1250°C for 4 hours to obtain Ni 0.95 Zn 0.05 O heat sensitive ceramic material. XRD test shows that the phase is basically Ni 0.95 Zn 0.05 O solid solution. The sintering radial shrinkage rate is 15.6%, the sintering performance is good, and the ceramics are relatively dense. Performance tests show that in the temperature range of 50-300°C, the B value is 4107K, and the linearity is 0.99816; in the temperature range of 50-100°C, the linearity of the resistance-temperature curve is 0.970, and the temperature coefficient of resistance TCR is -0.013 / K. Its corresponding data such as figure 1 , figure 2 , image 3 shown.

Embodiment 2

[0024] Weigh 14.222g of Ni 2 o 3 and 0.778g of ZnO, so that the molar ratio is 0.90:0.10. It was wet ball milled for 20 hours. The mixture was washed and then dried at 80°C to obtain a uniformly mixed ceramic powder. Grind the powder, sieve, add binder, dry press at about 4Mpa, and sinter in air at 1350°C for 2 hours to obtain Ni 0.9 Zn 0.1 O heat sensitive ceramic material. XRD test shows that the phase is basically Ni 0.9 Zn 0.1 O solid solution. The sintering radial shrinkage rate is 16.0%, the particle size after sintering is about 3 μm, and the sintering performance is good. Performance tests show that in the temperature range of 50-300°C, the B value is 4677K, and the linearity is 0.99534; in the temperature range of 50-100°C, the linearity of the resistance-temperature curve is 0.984, and the temperature coefficient of resistance TCR is -0.013 / K. Such as Figure 4 , Figure 5 , Image 6 , Figure 7 shown.

Embodiment 3

[0026] Weigh 13.357g of Ni 2 o 3 And ZnO of 1.643g, make its molar ratio be 0.80:0.20. It was wet ball milled for 20 hours. The mixture was washed and then dried at a certain temperature of 80° C. to obtain uniformly mixed ceramic powder. Grind the powder, sieve, add binder, dry press molding at about 4Mpa, and sinter in air at 1450°C for 2 hours to obtain Ni 0.8 Zn 0.2 O heat sensitive ceramic material. XRD test shows that the phase is basically Ni 0.8 Zn 0.2 O solid solution. The sintering radial shrinkage rate is 16.0%, and the sintering performance is good. Performance tests show that in the temperature range of 50-300°C, the B value is 4862K, and the linearity is 0.99643; in the temperature range of 50-100°C, the linearity of the resistance-temperature curve is 0.987, and the temperature coefficient of resistance TCR is -0.014 / K. Its related data such as Figure 8 , Figure 9 , Figure 10 shown.

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Abstract

A Ni-Zn-O-based heat-sensitive ceramic material and a preparation method thereof, belonging to the field of material science, the main raw material is Ni 2 o 3 and ZnO, the raw materials are wet-mixed by ball milling, washed, and dried to obtain ceramic powder, and the Ni-Zn-O series heat-sensitive ceramic material is obtained by grinding the powder, sieving, dry pressing, and high-temperature sintering . By controlling the Ni / Zn molar ratio and sintering temperature, the heat-sensitive properties of this material system can be tuned. The invention has simple ingredients and process, cheap raw materials, and wide application of materials; in terms of performance, it has high sensitivity index, good linearity of resistance temperature curve, and high temperature coefficient of resistance; simple process components, easy sintering of the system, and easy process Controlling, effectively reducing production costs, has a good implementation prospect.

Description

technical field [0001] The invention relates to a Zn-Ni-O-based NTC heat-sensitive ceramic material and a preparation method thereof, belonging to the field of material science. Background technique [0002] NTC (Negative temperature coefficient) thermistor is the abbreviation of negative temperature coefficient thermistor. Thermistors are widely used in food processing, fermentation, refrigeration, breeding, textiles, machinery manufacturing, aerospace technology, medical and health and other industrial and agricultural production departments because of their high sensitivity, fast response, good stability, small size and low price. and people's daily life. As early as 1930, Germany first used uranium oxide to make a negative temperature coefficient semiconductor thermistor; at present, most of the existing NTC thermistors are ternary systems such as Ni 0.66 Zn x mn 2.34-x o 4 system, Co-Mn-Ni-O system, Co-Mn-Ni-O system and Ni-Mn-Cu-O system, etc., the composition is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/30
Inventor 林元华王瑜南策文王建飞
Owner TSINGHUA UNIV
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