ZnO-Bi2O3 pressure-sensitive ceramic dielectric doped with rare-earth oxide

A technology of rare earth oxides and varistor ceramics, applied in the direction of varistors, etc., can solve the problem that the composition of varistor ceramics has not been reported publicly.

Inactive Publication Date: 2006-10-11
XI AN JIAOTONG UNIV
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Problems solved by technology

[0003] At present, the focus on the doping of rare earth oxides is mainly on the types of additives on the traditional ZnO-Bi 2 o 3 In the study of the influence of t

Method used

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preparation example Construction

[0014] ZnO-Bi doped with the above rare earth oxides 2 o 3 A method for preparing a pressure-sensitive ceramic medium, comprising the steps of:

[0015] 1) Proportionally weigh according to the composition A~R in Table 1. The additive components used are reagent pure, and the main material ZnO is industrial pure specially for varistors, and its average particle size is about 0.5 μm.

[0016] 2) After weighing each composition ratio, remove ZnO, Al(NO 3 ) 3 9H 2 All components except O were mixed and ball-milled for 20 hours, dried at 120°C and then pre-fired at 900°C for 30 minutes.

[0017] 3) The calcined components are crushed and then mixed with ZnO, Al(NO 3 ) 3 9H 2 O mixed, adding 1wt% concentration of polyvinyl alcohol aqueous solution ball milled for 20 hours to make slurry, then spray-dried into granulated material;

[0018] 4) Use a single-column press to press 50 tons of molding pressure into a circular sheet-shaped green body with a size of φ26×9mm. Press 6...

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Abstract

The invention discloses a process for preparing rare earth oxide doped ZnO-Bi2O3 family pressure-sensitive ceramic slurry, which comprises the following components (by molar portion): ZnO 91-98%, Bi2O3, Cr2O3, Co2O3, Ni2O3, MnCO3 and SiO2 each 0.1-1.0%, H3BO3 0.01-0.2%, Al(NO3)3 * 9H2O 0.001-0.01%, Sb2O3 0.5-2%, rare-earth oxide Ce2O3 or Gd2O3 0.1-1.0%.

Description

technical field [0001] The present invention relates to a kind of ZnO-Bi 2 o 3 It is a pressure-sensitive ceramic medium, especially a kind of rare earth oxide doped ZnO-Bi 2 o 3 It is a pressure-sensitive ceramic medium. Background technique [0002] Improve ZnO-Bi 2 o 3 A conventional method to reduce the potential gradient of varistor ceramics is to reduce the size of ZnO grains. If in ZnO-Bi 2 o 3 The varistor ceramics are doped with an appropriate amount of rare earth oxides, and the rare earth oxides or their phases only exist at the grain boundaries, which play a significant "pinning" role, significantly inhibiting the growth of ZnO grains, and can make The ZnO grain size is reduced to about 5 μm, so the corresponding potential gradient value can reach 400V / mm or above. So rare earth oxide doping on ZnO-Bi 2 o 3 Modification of varistor ceramics is an important method to improve the potential gradient of ceramic media. [0003] At present, the focus on the...

Claims

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Application Information

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IPC IPC(8): C04B35/453H01C7/10
Inventor 李盛涛成鹏飞
Owner XI AN JIAOTONG UNIV
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