A zinc oxide-based varistor doped with nitrogen ions and its preparation method
A varistor, zinc oxide-based technology, applied in varistor cores, varistors, etc., can solve the problems of deepening N-type semiconductors, etc., to increase width, improve nonlinear coefficient, and varistor Effect of Voltage Gradient Boost
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[0030] The preparation method of the above-mentioned zinc oxide-based varistor doped with nitrogen ions, the steps are as follows:
[0031] (1) In molar parts, take the first secondary component, the second secondary component, and the third secondary component and uniformly mix, and ball mill to make additive slurry;
[0032] (2) After the main component and the fourth subcomponent are dispersed with deionized water, they are uniformly mixed with the additive slurry obtained in step (1), and then polyvinyl alcohol solution is added to make a spray slurry; Measure, add 0.8 to 1.2 grams of polyvinyl alcohol solution per 100 grams;
[0033] (3) Spray-drying and granulating the spray slurry obtained in step (2) by using a spray-drying tower;
[0034] (4) dry pressing the granulated powder obtained in step (3) into a disc-shaped embryo body;
[0035] (5) sintering the green body obtained in step (4) after debinding at a temperature of 1100-1145° C. to obtain a zinc oxide-based p...
Embodiment 1～6
[0039] The distribution ratio of each component of the piezoresistor is according to Table 1, and a total of 7 groups of samples were produced, including a group of comparison samples. The comparison sample is without adding C 3 N 4 general formula.
[0040] Press the molar fraction shown in table 1, take by weighing the first secondary component Bi 2 o 3 、Co 3 o 4 、Ni 2 o 3 , MnCO3 , the second subcomponent Sb 2 o 3 and the third subcomponent C 3 N 4 , and mix evenly, add deionized water and mix ball mill to make additive slurry. Put the main component ZnO into the mixing tank, add ammonium salt dispersant, and add deionized water to disperse at the ratio of ZnO: deionized water = 1:0.8, and then add the required amount of the fourth auxiliary component Al(NO 3 ) 3 9H 2 O solution, uniformly stirred to make the main component slurry, slowly adding the additive slurry while stirring the main component slurry, and then adding the polyvinyl alcohol solution. The a...
Embodiment 7～9
[0049] The chemical composition of embodiment 7,8,9 is identical with embodiment 1,2,3 respectively, and the difference with embodiment 1~3 is that sintering temperature is respectively 1120 ℃, 1130 ℃, 1145 ℃, by increasing sintering temperature to make implementation The varistor potential gradients in examples 7, 8, and 9 are reduced to approximately the same as those of the comparison sample, and then the pulse impact test is performed, and the electrical performance test results are shown in Table 3 (the residual voltage ratio in the table is the varistor through the peak value. When the wave is 8 / 20μs of 1000A, the ratio of residual voltage to varistor voltage). It can be seen that the residual pressure ratios of Examples 7-9 are all lower than those of the control sample.
[0050] In summary, the nitrogen-doped zinc oxide-based varistor prepared by the method of the present invention has improved varistor voltage gradient and nonlinear coefficient compared with the compa...
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