Copper impregnated graphite is a new type of mechanical graphite material prepared by impregnating molten copper alloy into the pores of graphite using carbon graphite as the matrix material through vacuum pressure impregnation. Copper impregnated graphite has excellent electrical conductivity. At the same time, copper elements can also improve its strength and hardness, enhance its wear resistance and corrosion resistance. Therefore, Copper impregnated graphite is widely used in mechanical seals, thermal management, electronic equipment, machinery manufacturing and other fields.
Material composition and production process of Copper impregnated graphite:
Carbon graphite is used as the matrix material, and copper alloy is impregnated by vacuum pressure.
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The high hardness, good lubricity and chemical stability of carbon graphite are used as the matrix. The high melting point of copper alloy: 2800℃, ductility, high thermal conductivity and corrosion resistance are used to form a continuous, stable and high mechanical strength mechanical sealing material.
Copper impregnated graphite production process:
The preparation of Copper impregnated graphite usually adopts vacuum pressure impregnation method.
The high-purity carbon graphite matrix is prepared by cold pressing carbonization process to ensure that the matrix has an open pore structure to accommodate copper alloy impregnation.
In a vacuum environment, the molten copper alloy is impregnated into the carbon graphite matrix by pressure, so that the copper alloy fully penetrates into the pores of the matrix to form a uniformly distributed, continuous, stable, and high mechanical strength copper graphite material.
Performance characteristics of Copper impregnated graphite materials:
Improved mechanical properties:
Enhanced hardness: The mechanical strength is increased by more than 3 times after copper impregnation, and the hardness is significantly improved, which is suitable for high wear-resistant scenes;
Compressive strength: Due to the supporting role of the copper alloy, the compressive performance of the mechanical graphite material is greatly enhanced.
Optimized physical properties:
Thermal conductivity and electrical conductivity: The thermal conductivity is close to that of metal (exceeding steel, iron, etc.), and the electrical conductivity is 100 times higher than that of non-metal;
Thermal expansion coefficient: Only 1/30 of that of copper, the deformation is small when the temperature changes, and the thermal shock resistance is excellent;
Reduced density: The density is only 1/5 of that of copper, which reduces weight and reduces processing energy consumption.
Chemical and corrosion resistance:
Corrosion resistance: The chemical properties are stable at room temperature, resistant to acid and alkali corrosion, and suitable for harsh environments such as chemical and petroleum industries;
Anti-oxidation: The copper layer is not easily oxidized at room temperature, which prolongs its service life.
Improved processing performance:
Processability: It can be machined by turning, grinding and other mechanical processing, and parts with complex shapes can also achieve high precision;
Advantages of discharge machining: Graphite has fast conductivity (2-3 times faster than copper), is suitable for EDM, and has no burrs and is easy to polish.
Main properties/characteristics of Copper impregnated graphite materials:
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(1) Good conductivity: Copper impregnated graphite contains a large amount of copper particles, which makes it very conductive.
(2) Good mechanical properties: The presence of copper particles increases the strength and hardness of graphite, making graphite have good mechanical properties.
(3) Good wear resistance: The presence of copper particles can also improve the wear resistance of graphite.
(4) Good corrosion resistance: Graphite itself has good corrosion resistance. After adding copper particles, its corrosion resistance is even better.
(5) Good thermal conductivity: Graphite is a material with excellent thermal conductivity. After adding copper particles, its thermal conductivity is even better.
Main application areas of Copper impregnated graphite materials:
Copper impregnated graphite material is a new type of mechanical graphite material that combines graphite and copper. It combines the conductivity, corrosion resistance and mechanical properties of graphite. With its unique properties, Copper impregnated graphite material has become a key material in the electrolysis industry, conductive materials, corrosion-resistant materials, wear-resistant materials, casting, chemical industry and other industries.
High temperature conditions: Suitable for high temperature environments below 400℃, such as steam flowmeter bearings, hot oil pump sealing rings, etc.
Wear resistance and sealing: Used as wear-resistant sealing materials in the petroleum, chemical, machinery, metallurgy and other industries.
Special medium environment: Acid and alkali corrosion resistance, suitable for chemical pipelines, electrolysis equipment and other scenarios.
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