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Preparation method of a carbon ceramic linear resistor and its side composite insulating layer

A technology of composite insulation and linear resistors, applied in the direction of resistor manufacturing, resistors, resistor shells/packaging shells/potting, etc., can solve problems such as edge flashover of linear resistors, avoid thermal damage, solve edge flashover, The effect of improving electrical insulation strength

Active Publication Date: 2021-07-09
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the above-mentioned defects in the prior art, provide a method for preparing a carbon ceramic linear resistor and its side composite insulating layer, solve the problem of edge flashover of the linear resistor, and improve its tolerance to high voltage and high current impact

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for preparing an insulating layer on the side of a carbon-ceramic linear resistor provided in this embodiment includes the following steps:

[0027] (1) Get 15% bentonite by mass percentage, 15% levodolite and 70% mass percentage are evenly mixed with fine mullite powder in 325 orders, and additional mass percentage is 6 in the mixed powder. % chromium oxide as a coloring agent, and then put the mixed powder, zirconia balls and deionized water into a ball mill jar at a ratio of 1:2:0.7 for half an hour to obtain a high-resistance layer slurry.

[0028] (2) Evenly coat the obtained high-resistance layer slurry on the side of the unsintered formed resistor element blank, the coating thickness is about 0.5mm, and then put the coated resistor element blank into the oven to dry, and the oven The temperature is 120°C, and the holding time is more than 4 hours. Finally, put the resistance sample into a high-temperature furnace for sintering in a protective atmosphere...

Embodiment 2

[0033] A method for preparing an insulating layer on the side of a carbon-ceramic linear resistor provided in this embodiment includes the following steps:

[0034] (1) Get 15% bentonite by mass percentage, 15% levodolite and 70% mass percentage are evenly mixed with fine mullite powder in 325 orders, and additional mass percentage is 6 in the mixed powder. % chromium oxide as a coloring agent, and then put the mixed powder, zirconia balls and deionized water into a ball mill jar at a ratio of 1:2:0.7 for half an hour to obtain a high-resistance layer slurry.

[0035] (2) Evenly coat the obtained high-resistance layer slurry on the side of the unsintered formed resistor element blank, the coating thickness is about 0.5mm, and then put the coated resistor element blank into the oven to dry, and the oven The temperature is 120°C, and the holding time is more than 4 hours. Finally, put the resistance sample into a high-temperature furnace and sinter in a protective atmosphere su...

Embodiment 3

[0040] A method for preparing an insulating layer on the side of a carbon-ceramic linear resistor provided in this embodiment includes the following steps:

[0041] (1) Get 15% bentonite by mass percentage, 15% levodolite and 70% mass percentage are evenly mixed with fine mullite powder in 325 orders, and additional mass percentage is 6 in the mixed powder. % chromium oxide as a coloring agent, and then put the mixed powder, zirconia balls and deionized water into a ball mill jar at a ratio of 1:2:0.7 for half an hour to obtain a high-resistance layer slurry.

[0042] (2) Evenly coat the obtained high-resistance layer slurry on the side of the unsintered formed resistor element blank, the coating thickness is about 0.5mm, and then put the coated resistor element blank into the oven to dry, and the oven The temperature is 120°C, and the holding time is more than 4 hours. Finally, put the resistance sample into a high-temperature furnace and sinter in a protective atmosphere such...

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Abstract

The invention discloses a method for preparing a carbon ceramic linear resistor and its side composite insulation layer. The preparation method of the composite insulation layer firstly mixes bentonite, levodolite, calcined bauxite and chromium oxide evenly through ball milling to form a high-resistance layer slurry , the high-resistance layer slurry is coated on the side of the unsintered carbon ceramic resistor body and then sintered together with the resistor to obtain a layer of high-resistance layer on the side of the resistor; then glass powder, mullite powder or calcined alumina bauxite, Plastic clay and chromium oxide are uniformly mixed into glass glaze slurry by ball milling, and the glass glaze slurry is coated on the surface of the high resistance layer, and after sintering, a green and smooth insulating layer is formed on the side of the resistor; the insulating layer prepared by the present invention can be Significantly improve the resistance of carbon ceramic linear resistors to high voltage and high current impacts, and prevent flashover along the surface of the resistors.

Description

technical field [0001] The invention belongs to the technical field of electrical materials, and relates to a method for preparing a carbon ceramic linear resistor and a side composite insulating layer thereof. Background technique [0002] Carbon-ceramic linear resistors are mainly used at the fracture of high-voltage circuit breakers of 500kV and above to limit the operating overvoltage generated when the circuit breaker operates. It is one of the key electrical protection components for the development of ultra-high voltage power transmission and transformation equipment. In power systems Has a wide range of applications. However, the resistivity of carbon ceramic linear resistors for high-voltage switches is low, usually in the range of 1 to 1000Ω·cm, and the resistive surface is in a non-insulating semiconducting state. At the same time, it is easy to form pores, cracks and other defects on the side of the resistor during the manufacturing process, which makes the carb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/52C04B35/622C04B41/89H01C17/30H01C1/02
CPCC04B35/52C04B35/622C04B41/52C04B41/89H01C1/02H01C17/30C04B41/5031C04B41/0072C04B41/5022
Inventor 姚旭瑞陈维陈炜岳马红梅赵栓翠
Owner XI AN JIAOTONG UNIV
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