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Novel carbon composite ceramic linear resistor and preparation method thereof

A linear resistor and carbon composite technology, applied in the direction of ceramic products, resistor manufacturing, resistors, etc., can solve the problems of higher resistance that cannot meet the requirements, poor thermal stability and mechanical strength, large resistivity dispersion, etc., to achieve good stretching The effects of ductility, wide operating temperature range, and wide resistance range

Pending Publication Date: 2022-07-29
上海上纳电工器材有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the production process of graphite ceramic linear resistors, there are problems such as large resistivity dispersion, poor thermal stability and mechanical strength of the product, resulting in high technical difficulty, low qualified rate of finished products, high production cost, and it is difficult to meet the needs of the development of the power industry.
China CN201110283542.0 discloses a graphite ceramic linear resistor and its production method. The resistance range of the composite ceramic linear resistor product prepared by it is 0.2-20Ω, which cannot meet the requirements for higher resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The mass ratio of each component raw material of the carbon composite ceramic linear resistor in this embodiment is: 30 parts of bauxite; 30 parts of mullite; 24 parts of kaolin; 15 parts of carbon material; 0.5 part of polyvinyl alcohol; 0.5 part of ammonium polyacrylate share.

[0028] In the carbon material, the mass ratio of graphite and carbon fiber is: 90% of flake graphite; 10% of carbon fiber.

[0029] The preparation method of the above-mentioned carbon composite ceramic linear resistor is:

[0030] First weigh bauxite, mullite, kaolin, graphite and carbon fiber, polyvinyl alcohol and ammonium polyacrylate respectively, prepare the ingredients according to the above proportions, then ball mill in a ball mill for 12 hours; then use a centrifugal granulator to granulate. Put the granulated powder into the mold, press it with a hydraulic press, and press it into a cylinder with a diameter of Φ48mm and a height of 18mm; then degumming in a degumming furnace at 500...

Embodiment 2

[0033] The mass ratio of each component raw material of the carbon composite ceramic linear resistor in this example is: 38.5 parts of bauxite; 30 parts of mullite; 20 parts of kaolin; 10 parts of carbon material; 1 part of polyvinyl alcohol; 0.5 part of ammonium polyacrylate .

[0034] In the carbon material, the mass ratio of graphite and carbon fiber is: 80% of spherical graphite; 20% of carbon fiber.

[0035] The preparation method of the above-mentioned carbon composite ceramic linear resistor is:

[0036] First weigh bauxite, mullite, kaolin, graphite and carbon fiber, polyvinyl alcohol and ammonium polyacrylate respectively, prepare the ingredients according to the above ratio, and then ball mill in a ball mill for 12 hours; then use a centrifugal granulator to granulate. Put the granulated powder into the mold, press it with a hydraulic press, and press it into a cylinder with a diameter of Φ48mm and a height of 18mm; then degumming in a degumming furnace at 500 °C; ...

Embodiment 3

[0039] The mass ratio of each component raw material of the carbon composite ceramic linear resistor in this example is: 30 parts of bauxite; 30 parts of mullite; 17.5 parts of kaolin; 20 parts of carbon material; 1 part of polyvinyl alcohol; 1.5 parts of ammonium polyacrylate .

[0040] In the carbon material, the mass ratio of graphite and carbon fiber is: flake graphite 45%; spherical graphite 45%; carbon fiber 10%.

[0041] The preparation method of the above-mentioned carbon composite ceramic linear resistor is:

[0042] First weigh bauxite, mullite, kaolin, graphite and carbon fiber, polyvinyl alcohol and ammonium polyacrylate respectively, prepare the ingredients according to the above ratio, and then ball mill in a ball mill for 12 hours; then use a centrifugal granulator to granulate. Put the granulated powder into the mold, press it with a hydraulic press, and press it into a cylinder with a diameter of Φ48mm and a height of 18mm; then degumming in a degumming furna...

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Abstract

The invention relates to a novel carbon composite ceramic linear resistor and a preparation method thereof. The carbon composite ceramic linear resistor is prepared from the following raw materials in parts by weight: 30-50 parts of bauxite, 30-50 parts of mullite, 10-30 parts of kaolin, 5-20 parts of a carbon material, 0.1-1.5 parts of an adhesive and 0.1-1.5 parts of a dispersing agent. Compared with the prior art, the manufacturing method of the carbon composite ceramic linear resistor has the advantages that the technological process is simple, the equipment cost is low, raw materials are easy to obtain, and the manufactured resistor is wide in resistance value range, high in energy density, wide in use temperature range and high in thermal shock resistance.

Description

technical field [0001] The invention belongs to the technical field of preparation of linear resistance materials, and relates to a novel carbon composite ceramic linear resistance and a preparation method thereof. Background technique [0002] In the field of power electronics, traditional resistors are mainly wirewound and film resistors. Wirewound resistors cannot withstand high voltages, have large inductances, have limited ability to withstand high currents and high energy. Membrane resistors have small current cross-sections, low impact resistance and low reliability. In terms of technology, the wire wound and film resistance insulators and resistors are made separately, and then connected, the process is more complicated. [0003] Graphite ceramic linear resistors are one of the key electrical protection components for the development of ultra-high voltage power transmission and transformation equipment to limit the overvoltage generated by high-voltage circuit brea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/185C04B35/622C04B35/80C04B38/00H01C17/30H01C1/02
CPCC04B35/10C04B35/185C04B35/622C04B38/00H01C17/30H01C1/02C04B2235/349C04B2235/425C04B2235/5248C04B2235/3463C04B2235/5296C04B2235/656C04B2235/6567C04B2235/9607
Inventor 杨贺君姚政任鑫施利毅尤万里
Owner 上海上纳电工器材有限公司
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