CeO2 system PTCR thermal sensitive ceramic material and preparation method thereof

A heat-sensitive ceramic and formula technology, applied in the field of new semiconductor ceramic materials and their preparation, can solve the problems of high lift-to-resistance ratio and less temperature-controlling materials for heat-sensitive ceramics, achieve stable performance, inhibit grain growth, and improve resistance to electricity. Effects of strength and stability

Inactive Publication Date: 2014-07-16
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] It can be seen from this that although environmentally friendly PTCR thermosensitive ceramic materials have far-reaching social significance and economic benefits, from the published literature and patents, thermosensitive ceramic materials with good performance, positive temperature coefficient, and high lift-to-drag ratio There are relatively few reports on the achievements of ceramic temperature control materials

Method used

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  • CeO2 system PTCR thermal sensitive ceramic material and preparation method thereof
  • CeO2 system PTCR thermal sensitive ceramic material and preparation method thereof
  • CeO2 system PTCR thermal sensitive ceramic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In this example, CeO 2 + 0.25 K 2 CO 3 + 0.003 D+ d Al 2 o 3 + 0.25 Bi 2 o 3 Carry out batching, wherein D is Nb 2 o 5 or Sb 2 o 3 , d=0~0.004, choose Bi as the initial raw material 2 o 3 、K 2 CO 3 , CeO 2 , Nb 2 o 5 、Al 2 o 3 , Sb 2 o 3 . Weigh after calculating the weight according to the molar ratio in the molecular formula, and the weighing quality is shown in Table 1:

[0022] Weighing according to the formula in the ingredient list 1, using zirconia balls and alcohol as the medium, according to the ratio of material: ball: alcohol = 1: 2.5: 1.5 (weight), put the above raw materials on the planetary mill at a speed of 280 rpm After ball milling for 4 hours and drying, the uniformly mixed oxide powder was obtained. Add 9wt% PVA (polyvinyl alcohol, concentration 10wt%) to the dried powder to granulate, and press a Φ10×2.0mm disc at a pressure of 10MPa.

[0023] The pressed discs were heat-treated in the atmosphere at 900°C for 2 hours (to ...

Embodiment 2

[0026] In this example, CeO 2 + 0.25 Na 2 CO 3 + c D+0.25Bi 2 o 3 Carry out batching, wherein D is Nb 2 o 5 or Sb 2 o 3 , c=0.002~0.003, choose Bi as the initial raw material 2 o 3 、Na2 CO 3 , CeO 2 , Nb 2 o 5 , Sb 2 o 3 . Weigh after calculating the weight according to the molar ratio in the molecular formula, and the weighing quality is shown in Table 3:

[0027] Weighing according to the formula in the ingredient list 1, using zirconia balls and alcohol as the medium, according to the ratio of material: ball: alcohol = 1: 2.5: 1.5 (weight), put the above raw materials on the planetary mill at a speed of 280 rpm After ball milling for 4 hours and drying, the uniformly mixed oxide powder was obtained. Add 9wt% PVA (polyvinyl alcohol, concentration 10wt%) to the dried powder to granulate, and press a Φ10×2.0mm disc at a pressure of 10MPa.

[0028] The pressed discs were heat-treated in the atmosphere at 900°C for 2 hours (to make them fully react in solid p...

Embodiment 3

[0031] In this example, CeO 2 + a Na 2 CO 3 + b K 2 CO 3 + 0.003 Sb 2 o 3 + 0.25 Bi 2 o 3 For batching, a, b=0.10-0.15, the initial raw material selection Bi 2 o 3 、K 2 CO 3 、Na 2 CO 3 , CeO 2 , Sb 2 o 3 . Weigh after calculating the weight according to the molar ratio in the molecular formula, and the weighing quality is shown in Table 5:

[0032]

[0033] Weighing according to the formula in the ingredient list 1, using zirconia balls and alcohol as the medium, according to the ratio of material: ball: alcohol = 1: 2.5: 1.5 (weight), put the above raw materials on the planetary mill at a speed of 280 rpm After ball milling for 4 hours and drying, the uniformly mixed oxide powder was obtained. Add 9wt% PVA (polyvinyl alcohol, concentration 10wt%) to the dried powder to granulate, and press a Φ10×2.0mm disc at a pressure of 10MPa.

[0034] The pressed discs were heat-treated in the atmosphere at 900°C for 2 hours (to make them fully react in solid ...

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Abstract

The invention relates to a CeO2 system PTCR thermal sensitive ceramic material and a preparation method thereof. A formula of the system material is CeO2+aNa2CO3+bK2CO3+cD+dM+eBi2O3, wherein a, b=0.01-0.30; D is an adding element, is at least one element in Nb, Sb or La, the content c is between 0.0003 and 0.01; M is at least one of Al2O3 and SiO2, the content d is between 0 and 0.03; and the content Bi2O3 e is between 0.10-0.80. The material is prepared by taking a traditional ceramic technology, and is prepared by sintering for 10-120 minutes at the temperature of 950-1200 DEG C in flowing nitrogen. The PTC effect of the novel ceramic material is obvious, the lift drag ratio can reach 104, the resistor nonlinear coefficient can reach more than 20%/DEG C, and the performance of the ceramic material is close to that of a traditional BaTiO3 system PTCR thermal sensitive ceramic material.

Description

technical field [0001] The invention relates to a new type of semiconductor ceramic material and its preparation method. The semiconducted material has a positive temperature coefficient of resistance (PTCR) effect, and is a new type of lead-free PTCR thermistor ceramic resistance material, which belongs to ceramic piezoelectric material Preparation technology field. Background technique [0002] PTCR ceramics generally refer to thermistor materials or components with a positive temperature coefficient of resistance (Positive Temperature Coefficient of Resistance). A typical PTCR material is a semiconductor ceramic material based on barium titanate. Its characteristic is that when the ambient temperature rises to a certain temperature (Curie point or switch temperature point), its resistance value will increase by several orders of magnitude. Using this material as a heating body, its heating power hardly changes with the change of the applied voltage, so it has the functio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B35/622
Inventor 朱兴文刘怡茵张甜甜王生伟朱欣然沈思月姜文中周晓
Owner SHANGHAI UNIV
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