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Linear graphite resistance chip and manufacturing method thereof

A technology of graphite resistors and resistor sheets, applied in resistor manufacturing, resistors, non-adjustable metal resistors, etc., can solve the problems of rapid resistance drop, high brittleness and high hardness, and achieve a wide operating temperature range and high temperature stability. Effect

Active Publication Date: 2013-09-25
SHANGHAI EAGTOP ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the clay carbon black resistors used in the market have good resistivity temperature stability under low temperature conditions, but the temperature drift begins to increase above 350°C, and the change is greater above 450°C, and the temperature drift reaches 2000ppm / °C
The temperature drift of oxidizing linear resistors is also very low at low temperatures, but the resistance value drops rapidly when the temperature is above 500°C, and the temperature drift can reach -600ppm. Negative temperature drift will cause the circuit to fail to close in time, resulting in equipment accidents
At the same time, zinc oxide resistors are ceramics, with high hardness and high brittleness, and are easy to crack during vibration.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] This embodiment provides a linear graphite resistance sheet, the proportion is: 20 parts by weight of graphite powder, 5 parts by weight of silicon dioxide, 35 parts by weight of alumina, 5 parts by weight of calcium oxide, 0.5 parts by weight of talc powder and 25 parts by weight of binder. Wherein, the binder can be selected from any commercial high-temperature-resistant binder specially used for graphite, and in this embodiment, the binder is coal tar pitch.

[0016] The particle size ratio of the graphite powder is: 5 parts by weight of at least 40 mesh graphite powder, 30 parts by weight of 40-100 mesh graphite powder, 45 parts by weight of 100-200 mesh graphite powder and 5 parts by weight of graphite powder above 200 mesh .

[0017] The preparation method of above-mentioned linear graphite resistor sheet is:

[0018] Step 1, prepare materials according to the above proportioning ratio;

[0019] Step 2. Mix the other materials except the binder evenly, then add...

Embodiment 2

[0026] This embodiment provides a linear graphite resistance sheet, the proportion is: 50 parts by weight of graphite powder, 30 parts by weight of silicon dioxide, 10 parts by weight of alumina, 1 part by weight of calcium oxide, 1 part by weight of talc powder and 35 parts by weight of binder. Among them, the binder can be selected from any high-temperature-resistant binder specially used for graphite on sale, and in this embodiment, the binder is a graphite anti-oxidation binder, and the graphite anti-oxidation binder is provided by Anyang City Produced by Best Special Graphite Products Co., Ltd.

[0027] The particle size ratio of the graphite powder is: 10 parts by weight of graphite powder of at least 40 meshes, 40 parts by weight of graphite powders of 40-100 meshes, 35 parts by weight of graphite powders of 100-200 meshes and 15 parts by weight of graphite powders of more than 200 meshes .

[0028] The preparation method of above-mentioned linear graphite resisto...

Embodiment 3

[0037] This embodiment provides a linear graphite resistance sheet, the proportion is: 40 parts by weight of graphite powder, 20 parts by weight of silicon dioxide, 27 parts by weight of alumina, 3 parts by weight of calcium oxide, 1 part by weight of talc powder and 35 parts by weight of binder. Wherein, the binder can be selected from any commercial high-temperature-resistant binder specially used for graphite, and in this embodiment, the binder is a mixture of coal tar pitch and aluminum dihydrogen phosphate.

[0038] The particle size ratio of the graphite powder is: 7 parts by weight of graphite powder of at least 40 meshes, 35 parts by weight of graphite powders of 40-100 meshes, 40 parts by weight of graphite powders of 100-200 meshes and 10 parts by weight of graphite powders of more than 200 meshes .

[0039] The preparation method of above-mentioned linear graphite resistor sheet is:

[0040] Step 1, prepare materials according to the above proportioning ratio;

...

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Abstract

The invention provides a linear graphite resistance chip which is characterized in that the linear graphite resistance chip comprises 20-50 parts by weight of graphite powder, 5-30 parts by weight of silica, 10-35 parts by weight of alumina, 1-5 parts by weight of calcium oxide, 0.5-1 parts by weight of talc, and 25-35 parts by weight of binders. The invention also provides a manufacturing methodof the linear graphite resistance chip, which is characterized in that the method comprises the following steps: firstly preparing materials, well mixing the materials, pressing into a green body, sintering and curing the green body to obtain a resistance chip, grinding the resistance chip, spraying or coating a metal material with good conductivity and corrosion resistance on the upper and lowerend surfaces of the resistance chip so as to allow conductive electrodes to be tightly combined with the product to obtain the linear graphite resistance chip. The advantage of the invention is that the prepared linear resistance chip has high temperature stability, and a wide service temperature range.

Description

technical field [0001] The invention relates to a graphite resistance sheet and a manufacturing method thereof, which are applied to energy-absorbing resistors under high-current impact environments such as wind power generation and high-power energy release in power electronic equipment. Background technique [0002] At present, the clay carbon black resistors used in the market have good temperature stability of resistivity under low temperature conditions, but the temperature drift begins to increase above 350°C, and the change is greater above 450°C, and the temperature drift reaches 2000ppm / °C. The temperature drift of oxidizing linear resistors is also very low at low temperatures, but the resistance value drops rapidly when the temperature is above 500°C, and the temperature drift can reach -600ppm. Negative temperature drift will cause the circuit to fail to close in time, resulting in equipment accidents. At the same time, zinc oxide resistors are ceramics, with hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C7/00H01C17/00
Inventor 洪英杰
Owner SHANGHAI EAGTOP ELECTRONICS TECH