Preparation method of zinc oxide varistor ceramic composite powder

A pressure-sensitive ceramic and composite powder technology is applied in the preparation of zinc oxide pressure-sensitive ceramic composite powder, and the nano-coating method is used to prepare zinc oxide pressure-sensitive ceramic composite powder, which can solve the problem of limited application scope and difficult process control. , Inability to introduce non-metallic additives and other problems, to achieve uniform coating effect, expand the scope of application, improve electrical stability and sintering characteristics

Active Publication Date: 2010-08-04
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

However, this method has two disadvantages: one is that segregation is prone to occur due to the different solubility products of various precipitates, and the process of accurately adjusting the Ph value range is difficult to control; the other is that it is usually used in commercial zinc oxide varistor formulations Add glass frit components such as boron oxide, si...

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  • Preparation method of zinc oxide varistor ceramic composite powder
  • Preparation method of zinc oxide varistor ceramic composite powder
  • Preparation method of zinc oxide varistor ceramic composite powder

Examples

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Embodiment 1

[0031] According to the formula ratio: 95.3mol% ZnO+4.7mol% (Bi 2 o 3 , Sb 2 o 3 , MnO, Co 2 o 3 , NiO, Cr 2 o 3 ), the Co(NO 3 ) 2 ·6H 2 O, Mn(NO 3 ) 2 ·5H 2 O, Cr(NO 3 ) 3 ·5H 2 O, Ni(NO 3 ) 2 ·6H 2 O is dissolved in the ethanol solution so that the total molar concentration of Co, Mn, Cr and Ni ions in the solution is 0.1mol / L, then add 38g of ZnO powder and stir; take 3.4g of Bi(NO 3 ) 3 ·5H 2 O was dissolved in 173ml of ethylene glycol, and 1.5g of Sb was added after dissolution 2 o 3 and 4g of citric acid, stirred and heated to 85°C for 4 hours, and added dropwise to the ethanol mixed solution after the solution became translucent. Stir and evaporate the mixed solution at 60°C to a viscous paste, then dry it in an oven at 170°C for 2 hours, transfer it to a muffle furnace at 400°C for 6 hours to make various nitrates, citrates, inorganic acids and organic substances It is decomposed into nano-oxide particles and coated on the surface of ZnO particl...

Embodiment 2

[0033] The formula of the zinc oxide varistor ceramic composite powder in the present embodiment is: by ZnO, metal oxide additive (Bi 2 o 3 , Sb 2 o 3 , MnO, Co 2 o 3 , NiO, Cr 2 o 3 ) and non-metallic oxide additives (B 2 o 3 ) composition; wherein, by mole percentage, ZnO accounts for 95.3mol%, metal oxide additive accounts for 4.7mol%; B 2 o 3 Accounting for 1.5wt% of the total weight of ZnO and metal oxide additives.

[0034] According to the above formula, the H 3 BO 3 , Co(NO 3 ) 2 ·6H 2 O, Mn(NO 3 ) 2 ·5H 2 O, Cr(NO 3 ) 3 ·5H 2 O, Ni(NO 3 ) 2 ·6H 2 O is dissolved in the ethanol solution so that the total molar concentration of B, Co, Mn, Cr and Ni ions in the solution is 20mol / L, then add 38g of ZnO powder and stir; take 3.4g of Bi(NO 3 ) 3 ·5H 2 O was dissolved in 8.6ml of ethylene glycol solution, and then 1.5g of Sb was added 2 o 3 Stir with 4g of citric acid and heat to 95°C for 4 hours. After the solution becomes translucent, add it drop...

Embodiment 3

[0036] The formula of the zinc oxide varistor ceramic composite powder in the present embodiment is: by ZnO, metal oxide additive (Bi 2 o 3 , Sb 2 o 3 , MnO, Co 2 o 3 , NiO, Cr 2 o 3 ) and non-metallic oxide additives (SiO 2 ) composition; wherein, by mole percentage, ZnO accounts for 95.3mol%, metal oxide additives account for 4.7mol%; SiO 2 Accounting for 0.5wt% of the total weight of ZnO and metal oxide additives.

[0037] Ethyl orthosilicate, Co(NO 3 ) 2 ·6H 2 O, Mn(NO 3 ) 2 ·5H 2 O, Cr(NO 3 ) 3 ·5H 2 O, Ni(NO 3 ) 2 ·6H 2 O is dissolved in the ethanol solution so that the total molar concentration of Si, Co, Mn, Cr and Ni ions in the solution is 0.5mol / L, then add 38g of ZnO powder and stir; take 3.4g of Bi(NO 3 ) 3 ·5H 2 O was dissolved in 25ml of ethylene glycol solution, then 1.5g of Sb was added 2 o 3 Stir with 4g of citric acid and heat to 90°C for 4 hours. After the solution becomes a translucent emulsion, add it dropwise to the ethanol mixed ...

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Abstract

The invention relates to a preparation method of zinc oxide varistor ceramic composite powder. The method is improved based on the existing liquid-phase coating process, takes zinc oxide powder as a main material, and adopts a two-step method to dissolve metal oxide additives, wherein Sb2O3 is induced by taking citric acid as a complexing agent, and other metal oxides are induced in a nitrate or acetate form, thereby not only solving the problem that the single complex method has high viscosity to affect the coating effect, but also solving the problem that the Sb2O3 can not be induced when the nitrate form is adopted. In addition, the invention also induces non-metal oxide addictives in the nano coating process to obtain the zinc oxide varistor ceramic with the nano coating structure containing the non-metal oxide addictives. The method of the invention can be used for all addictive formulas of currently commercial ZnO varistors, the obtained composite power has more uniform particlesize and distribution of components, and the ceramic with the performance substantially better than the commercial ZnO varistors can be obtained by utilizing the ordinary ceramic sintering technology.

Description

technical field [0001] The invention relates to a method for preparing a zinc oxide pressure-sensitive ceramic composite powder, in particular to a method for preparing a zinc oxide pressure-sensitive ceramic composite powder by using a nano-coating method, which belongs to the field of electrical materials and preparation. Background technique [0002] Zinc oxide varistor ceramics have excellent current-voltage (I-V) nonlinear characteristics, which can prevent overvoltage in the circuit and absorb surge energy. It has become the best protective and fastest-growing overvoltage protection device and is widely used in DC / AC In power transmission system and various electrical and electronic equipment. The focus of current research is to improve its electrical resistance (voltage gradient), nonlinear effect and high current impact capability, and the preparation of composite powder raw materials is one of the keys to improve its performance. [0003] The preparation process of...

Claims

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Application Information

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IPC IPC(8): C04B35/453C04B35/628
Inventor 李国荣袁恺阳郑嘹赢程丽红殷庆瑞
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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