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Graphite aluminum-magnesium alloy grounding material and preparing method thereof

A technology of aluminum-magnesium alloy and grounding body, applied in the direction of connecting contact materials, metal/alloy conductors, carbon-silicon compound conductors, etc., can solve problems such as poor grounding effect, achieve simple construction, reduce grounding resistance, and stabilize grounding resistance value Effect

Inactive Publication Date: 2010-12-29
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a graphite-aluminum-magnesium alloy grounding body material, which overcomes the problem that the existing grounding body is easily subjected to soil electrochemical corrosion and has poor grounding effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Take 21.8 kg of flaky graphite and place it in a mixed solution of hydrochloric acid and nitric acid (mass ratio 1.25:0.4) with a concentration of 85% and stir and soak for 4 hours for pickling. After washing with water until the pH value is neutral, put the graphite in a concentration of 85% Pickling in a mixed solution of hydrochloric acid and nitric acid (mass ratio 1.25:0.4) for 2 hours, then washing with water until the pH value is neutral, dehydration to make the water content less than 40%; expand the graphite raw material at 800 ° C to make it expand itself After graphite worms with 50 times the volume; add 1.4 kg of magnesium powder, 0.6 kg of aluminum powder, 1.2 kg of manganese powder, and 0.6 kg of zinc powder, stir evenly, and extrude graphite worms under a pressure of 5 MPa to form graphite worm blanks, 1100 Degree of high temperature, 150 hours of roasting.

[0017] The compressive strength of the product is 5.8Mpa, and the resistivity is 14.465×10 -6 Ω....

Embodiment 2

[0019] Get 50.8 kilograms of flaky graphite and place it in a mixed solution of hydrochloric acid and nitric acid (mass ratio 1.25:0.4) with a concentration of 87% and stir and soak for 8 hours for pickling. After washing with water until the pH value is neutral, put the graphite in a concentration of 87% Pickling in a mixed solution of hydrochloric acid and nitric acid (mass ratio 1.25:0.4) for 3 hours, then washing with water until the pH value is neutral, dehydration to make the water content less than 40%; expand the graphite raw material at 1000 ° C to make it expand itself After graphite worms with a volume of 55 times, add 3.2 kg of magnesium powder, 1.4 kg of aluminum powder, 2.8 kg of manganese powder, and 1.4 kg of zinc powder, stir evenly, and extrude graphite worms under a pressure of 6 MPa to form graphite worm blanks. It is made by firing at a high temperature of 1125 degrees for 155 hours.

[0020] The compressive strength of baked graphite is 5.8Mpa, and the re...

Embodiment 3

[0022] Take 90.8 kg of flake graphite and place it in a mixed solution of hydrochloric acid and nitric acid (mass ratio 1.25:0.4) with a concentration of 90% and stir and soak for 12 hours for pickling. After washing with water until the pH value is neutral, put the graphite in a concentration of 90% Pickling in a mixed solution of hydrochloric acid and nitric acid (mass ratio 1.25:0.4) for 4 hours, then washing with water until the pH value is neutral, dehydration to make the water content less than 40%; expand the graphite raw material at 1300 ° C to make it expand itself After graphite worms with a volume of 70 times, add 5.8 kg of magnesium powder, 2.5 kg of aluminum powder, 5.2 kg of manganese powder, and 2.5 kg of zinc powder, stir evenly, and extrude the graphite worm under a pressure of 8 MPa to form a graphite worm blank. It is made by firing at a high temperature of 1150 degrees for 160 hours.

[0023] The compressive strength of baked graphite is 5.8Mpa, and the res...

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Abstract

The present invention provides a graphite aluminum-magnesium alloy grounding material which is obtained through the following steps: placing the graphite into a mixed solution of hydrochloric acid andnitric acid for immersing and acid washing twice for changing the inner structure, after rinsing until the pH value gets to 7.0, dewatering for high-temperature swelling, expanding the graphite wormto 50-70 times of normal volume; adding magnesium powder, aluminum powder, manganese powder and zinc powder, mixing to uniform; executing extrusion forming to the graphite worm under the pressure of 5-8MPa for forming a graphite worm bland; and executing high temperature sintering. According to the invention, the graphite is added with metallic ions of magnesium, aluminum, manganese and zinc. Thegraphite aluminum-magnesium alloy grounding material of the invention has the advantages of stable resistance value of product, good corrosion resistance, cathodic protection provided for the main grounding system, effectively reduced grounding resistance and delayed corrosion efficiency of main grounding network. The graphite aluminum-magnesium alloy grounding material of the invention is suitable for the grounding of high soil resistivity areas (mountain area, sand land, etc.) including the tower of transmission line, meteorological station and ecological monitoring station.

Description

technical field [0001] The invention provides a graphite-aluminum-magnesium alloy grounding body material, and also discloses a manufacturing method of the grounding body, which belongs to the technical field of metallurgical materials. Background technique [0002] The grounding device is an essential facility to ensure working grounding, lightning protection grounding, and protective grounding in power plants, substations, communication stations, transmission line towers, weather stations, hydrological stations, and ecological monitoring stations. For economic considerations, the grounding device is generally made of galvanized carbon steel (flat steel, round steel). However, in the environment with high soil resistivity in mountainous areas, ordinary grounding cannot meet the requirements of reducing resistance at all. Therefore, some special grounding materials are used, such as graphite non-metallic grounding body, copper-clad steel materials, etc.; but in acidic soil i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01R4/66H01B1/04H01B1/02B22F3/20
Inventor 聂森余新晓李延安王百田陈丽华鲁绍伟王玉华盛祥飞
Owner BEIJING FORESTRY UNIVERSITY
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