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Method for improving zinc oxide varistor flow capacity by regulating bismuth oxide crystal morphology, zinc oxide resistor sheet and preparation method thereof
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A technology of zinc oxide resistors and shapes, which is applied in the fields of varistors, overvoltage protection resistors, and resistor manufacturing, and can solve problems such as damage to resistors, limited flow capacity of zinc oxide resistors, etc.
Active Publication Date: 2021-02-05
湖南防灾科技有限公司 +1
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[0003] The existing zinc oxide resistors have limited flow capacity, and in actual field applications, accidents of damage to resistors caused by lightning strikes often occur
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Embodiment 1
[0069] This embodiment is used to illustrate the preparation method of the zinc oxide resistance sheet of the present invention, comprises the steps:
[0070] (1) Ingredients: Weigh raw materials according to mole percentage: ZnO 94.2%, Bi 2 o 3 1.2%, Sb 2 o 3 1.0%, Co 2 o 3 0.8%, MnO 2 0.6%, SiO 2 0.5%, Ni 2 o 3 0.6%, Al(NO 3 ) 3 0.08%, B 2 o 3 0.4%, Ga 2 o 3 0.62%.
[0071] (2) Wet milling and granulation: the raw materials described in step (1) are mixed with water and then ball milled to a slurry with a particle size below 2 μm, and then the slurry is dried and granulated to obtain a granulated material;
[0072] (3) Tabletting: the granulated material obtained in step (2) is pressed into sheets to obtain a prefabricated embryo body of a zinc oxide resistor;
[0073](4) Pre-sintering: the prepared prefabricated body is further dried and pre-sintered, the pre-sintering temperature is 400-900°C, the holding time is 1-4h, and the heating rate is 2-5°C / m...
Embodiment 2
[0115] The difference between this embodiment and embodiment 1 is: the raw material formula is different, specifically: ZnO94.44%, Bi 2 o 3 1.5%, Sb 2 o 3 0.8%, Co 2 o 3 0.8%, Cr 2 o 3 0.2%, MnO 2 0.7%, SiO 2 0.5%, Ni 2 o 3 0.6%, Al(NO 3 ) 3 0.06%, B 2 o 3 0.4%.
Embodiment 3
[0117] The difference between this embodiment and embodiment 1 is: the raw material formula is different, specifically: ZnO93.295%, Bi 2 o 3 0.7%, Sb 2 o 3 1.5%, Co 2 o 3 0.5%, Cr 2 o 3 0.5%, MnO 2 0.5%, SiO 2 1.5%, Ni 2 o 3 0.4%, Al(NO 3 ) 3 0.08%, B 2 o 3 0.2%, Ga 2 o 3 0.825%.
[0118] It has been verified by experiments that the zinc oxide resistors prepared in Example 2 and Example 3, the α-Bi in the microscopic crystal structure 2 o 3 and γ-Bi 2 o 3 The ratio is also improved relative to Comparative Example 1, and the overall performance is comparable to that of Examples.
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Abstract
The invention discloses a method for improving the flow capacity of a zincoxidevaristor by regulating the crystal form of bismuthoxide, a zincoxide resistance sheet and a preparation method thereof. The temperature and the heating and cooling rate are optimized to realize the regulation of the bismuth oxide crystal morphology in the zinc oxide resistor, and reduce the β-Bi in the bismuth oxide crystal. 2 o 3 and δ‑Bi 2 o 3 The ratio of the two structures and increased α‑Bi in bismuth oxide crystals 2 o 3 and γ‑Bi 2 o 3 The proportion of the two crystal structures effectively improves the uniformity of the microscopic grain boundary structure of the zinc oxide resistor, reduces the gap in the grain boundary layer, makes the distribution of the crystal structure more uniform, and improves the flow capacity of the resistor. According to the electrical performance test, the zinc oxide resistance sheet prepared by the method of the present invention is more stable under the impact current than the traditional zinc oxide resistance sheet.
Description
technical field [0001] The invention relates to the technical field of disaster prevention and reduction in electric power systems, in particular to a preparation method of a zinc oxide resistance sheet. Background technique [0002] According to statistics, more than 50% of the tripping accidents in the power system are caused by lightning strikes. With the continuous development of the national economy, the people put forward higher requirements for the reliability of electricity consumption. The zinc oxide arrester is installed in the transmission line, mainly to discharge the lightning current and limit the lightningovervoltage of the power system. The zinc oxide varistor is the core unit of the zinc oxide arrester, and its flow capacity determines the lightning protection performance of the zinc oxide arrester. [0003] The current flow capacity of the existing zinc oxide resistors is limited, and in actual field applications, accidents of damage to the resistors cau...
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