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Carbon ceramic linear resistor, and preparation method of composite insulating layer on side surface of carbon ceramic linear resistor

A technology of composite insulation and linear resistors, which is applied in the manufacture of resistors, 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 the ability to withstand high voltage and high current

Active Publication Date: 2020-08-21
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 carbon ceramic linear resistor, and a preparation method of a composite insulating layer on the side surface of the carbon ceramic linear resistor. The preparation method ofthe composite insulating layer comprises the following steps: firstly, uniformly mixing bentonite, Zuoyun soil, calcined alumina and chromium oxide through ball milling to form high-resistance layer slurry, coating the side surface of an unsintered carbon ceramic resistor blank with the high-resistance layer slurry, and sintering together with a resistor to obtain a high-resistance layer on the side surface of the resistor; then uniformly mixing glass powder, mullite powder or calcined bauxite oxide, plastic clay and chromium oxide through ball milling to form glass glaze slurry, coating the surface of the high-resistance layer with the glass glaze slurry, and sintering to form the green and smooth insulating layer on the side surface of the resistor. The insulating layer prepared in the invention can obviously improve the endurance capacity of the carbon ceramic linear resistor to high-voltage and large-current impact, and prevent the resistor from flashover along the surface.

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 Applications(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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