Method for preparing high-voltage gradient zinc oxide piezo-resistance by doping and coating method
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A varistor and zinc oxide technology, which is applied in the direction of varistors and varistor cores, can solve the problems of increased production costs, difficulty in uniformity, and difficulty in achieving uniformity
Inactive Publication Date: 2021-05-28
XIDIAN UNIV
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The disadvantage of the solid phase method is that it is difficult to achieve a good uniformity of the additive and the material as a whole
The disadvantage of the co-precipitation method is that it will easily cause the loss of additives, making it difficult to control the amount of addition, and the waste of drugs is serious, and the production cost will increase
Sol-gel preparation of composite additives can improve the uniformity of additives, but it is difficult to achieve good uniformity by mixing additives and ZnO through ball milling
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Embodiment 1
[0031] A method for preparing a high-voltage gradient zinc oxide varistor by a doping coating method, characterized in that it includes the following steps:
[0032] Step S1: Dissolve manganese carbonate, bismuth oxide, nickel hydroxide, and cobalt nitrate hexahydrate in excess nitric acid respectively, and prepare nitric acid with 25% dilute nitric acid in a volumetric flask to obtain 0.05mol / L nitric acid Manganese nitrate of cobalt, 0.06mol / L, bismuth nitrate of 0.1mol / L, nickel nitrate of 0.09mol / L, and the prepared salt solution is measured in proportion and uniformly mixed to obtain a sol, and the tin dichloride solution is dissolved in ethanol.
[0033] Step S2: drop the sol prepared in step S1 and tin dichloride dissolved in ethanol into the citric acid solution respectively, adjust the pH to 6.0, and prepare a wet sol in a water bath for 5 hours.
[0034] Step S3: adding ZnO to the wet sol prepared in step S2 to form a coated gel, adding a stirrer to continuously sti...
Embodiment 2
[0045] A method for preparing a high-voltage gradient zinc oxide varistor by a doping coating method, characterized in that it includes the following steps:
[0046] Step S1: Dissolve manganese carbonate, bismuth oxide, nickel hydroxide, and cobalt nitrate hexahydrate in excess nitric acid respectively, and prepare nitric acid with 25% dilute nitric acid in a volumetric flask to obtain 0.05mol / L nitric acid Manganese nitrate of cobalt, 0.06mol / L, bismuth nitrate of 0.1mol / L, nickel nitrate of 0.09mol / L, and the prepared salt solution is measured in proportion and uniformly mixed to obtain a sol, and the tin dichloride solution is dissolved in ethanol.
[0047]Step S2: drop the sol prepared in step S1 and tin dichloride dissolved in ethanol into the citric acid solution respectively, adjust the pH to 5.0, and prepare a wet sol in a water bath for 5 hours.
[0048] Step S3: adding ZnO to the wet sol prepared in step S2 to form a coated gel, adding a stirrer to continue the wate...
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Abstract
The invention relates to the technical field ofpiezo-resistance materials, in particular to a method for preparing a high-voltage gradient zinc oxide piezo-resistance by a doping and coating method, which comprises the following steps of: S1, using additives manganese carbonate, bismuth oxide, nickel hydroxide and cobalt nitrate hexahydrate to prepare sol by a liquid phase method; S2, performing water bath on the sol prepared in the step S1 to form wet sol; S3, adding ZnO into the wet sol prepared in the step S2, continuously conducting stirring in a stirrer, and carrying out water bath for 15 hours; S4, drying the coated ZnO, and calcining the ZnO to obtain ZnO powder uniformly coated with the additives; and S5, adopting an electronic ceramic preparation process, and sequentially carrying out granulation, tabletting, sintering, silver coating and silver firing on the powder prepared in the step S4 to prepare the zinc oxide piezo-resistance. The microcosmic uniformity of the additives at the grain boundary can be better, the effect of stable distribution of the additives in the grain boundary is achieved, and then the performance of the piezoresistor is improved.
Description
technical field [0001] The invention relates to the technical field of varistor materials, in particular to a method for preparing a high-voltage gradient zinc oxide varistor by a doping coating method. Background technique [0002] The preparation of ZnO varistors is based on ZnO as the main raw material, and adding various additives (such as Bi 2 o 3 , Sb 2 o 3 ,Co 3 o 4 , NiO, etc.), under a certain process to achieve its large nonlinear coefficient, small leakage current, strong flow capacity and other properties. We often use its nonlinear characteristics. When the input voltage is greater than the voltage at both ends of the varistor, the varistor can clamp the voltage to a relatively fixed voltage value, thereby realizing the protection of the subsequent circuit. [0003] Due to the variety of components, the processing method of additives and the mixing method of various materials become the key technical steps that affect the performance. In the past, the met...
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