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Molding sintering graphite sealed ring and manufacturing method thereof

A technology of graphite sealing ring and manufacturing method, which is applied in chemical instruments and methods, building structure, other chemical processes, etc., can solve the problems of water pump or cooling pump not working normally, engine damage, low operating temperature, etc., to improve the hardness , Improve the service life, improve the effect of density and strength

Inactive Publication Date: 2009-07-15
NINGBO DONGLIAN MECHANICAL SEAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the hot-pressed graphite sealing ring can be used at room temperature, it is easy to deform at low temperature, wears quickly, and is not resistant to corrosion. It will deform when the temperature is higher than 100°C or when there is a corrosive medium. It is difficult to use hot-pressed graphite sealing rings in many harsh working conditions, especially when used in automobile water pumps and diesel engine cooling pumps, it is easy to cause water leakage, which will damage the engine and make the water pump or cooling pump unable to work normally

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Composition: 80% by weight of coal tar pitch, 15% by weight of earthy graphite, and 5% by weight of wear-resistant carbon ink.

[0018] Process steps: First, weigh coal tar pitch, earthy graphite and wear-resistant carbon ink according to the weight ratio, and stir them evenly; then add absolute ethanol and the evenly mixed powder into the kneader according to the volume ratio of 0.1:1, heat and knead Synthesize granular block, kneading time is controlled at 2 to 5 hours, and kneading temperature is controlled at 165°C to 220°C; the granular block after kneading is cooled first, and then crushed into powder with a pulverizer, and the powder is passed through Sieve 60-120 mesh, that is, use 60-120 mesh sieve to sieve the powder; put the sieved powder into the mold and apply 100-200Mpa / cm 2 For pressure forming, the temperature of the hydraulic press is controlled at 165°C to 200°C, and the pressing time is controlled at 30 seconds to 2 minutes; then the pressed and forme...

Embodiment 2

[0021] Composition: 87% by weight of coal tar pitch, 10% by weight of earthy graphite, and 3% by weight of wear-resistant carbon ink.

[0022] Process steps: First, weigh coal tar pitch, earthy graphite and wear-resistant carbon ink according to the weight ratio, and stir them evenly; then add absolute ethanol and the evenly mixed powder into the kneader according to the volume ratio of 0.1:1, heat and knead Synthesize granular block, kneading time is controlled at 2 to 5 hours, and kneading temperature is controlled at 165°C to 220°C; the granular block after kneading is cooled first, and then crushed into powder with a pulverizer, and the powder is passed through Sieve 60-120 mesh, that is, use 60-120 mesh sieve to sieve the powder; put the sieved powder into the mold and apply 100-200Mpa / cm 2 For pressure forming, the temperature of the hydraulic press is controlled at 165°C to 200°C, and the pressing time is controlled at 30 seconds to 2 minutes; then the pressed and forme...

Embodiment 3

[0025] Composition: 92% by weight of coal tar pitch, 7% by weight of earthy graphite, and 1% by weight of wear-resistant carbon ink.

[0026] Process steps: First, weigh coal tar pitch, earthy graphite and wear-resistant carbon ink according to the weight ratio, and stir them evenly; then add absolute ethanol and the evenly mixed powder into the kneader according to the volume ratio of 0.1:1, heat and knead Synthesize granular block, kneading time is controlled at 2 to 5 hours, and kneading temperature is controlled at 165°C to 220°C; the granular block after kneading is cooled first, and then crushed into powder with a pulverizer, and the powder is passed through Sieve 60-120 mesh, that is, use 60-120 mesh sieve to sieve the powder; put the sieved powder into the mold and apply 100-200Mpa / cm 2 For pressure forming, the temperature of the hydraulic press is controlled at 165°C to 200°C, and the pressing time is controlled at 30 seconds to 2 minutes; then the pressed and formed...

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Abstract

The invention discloses a mould-pressing sintered graphite sealing ring and a manufacturing method thereof. The sealing ring comprises the following components by weight percentage: 80 to 92 percent of coal pitch, 3 to 15 percent of amorphous graphite, and 1 to 7 percent of abrasion-resistant carbon ink. The manufacturing method comprises the following steps: weighing each component according to the weight percentage, evenly stirring the components, adding the components and anhydrous ethyl alcohol into a kneader according to a volume ratio of 1 to 0.1, heating the mixture and kneading the mixture into granular lump materials, wherein the kneading time is 2 to 5 hours, and the kneading temperature is 165 to 220 DEG C; cooling and crushing the kneaded lump materials, sieving the crushed lump materials by a sieve of 60 to 120 meshes, then putting the sieved lump materials into a mould, and applying pressure of 100 to 200Mpa / to shape, wherein the temperature of a hydraulic press is 165 to 200 DEG C, and the pressing time is 30 seconds to 2 minutes; insulating the pressed and shaped product in a vacuum furnace at a temperature of between 1,100 and 1,350 DEG C, and sintering the product for 0.5 to 3 hours for shaping; and dipping the shaped product in a vacuum dipping furnace by resin. The sealing ring is not only easy to deform, and has the advantages of good self lubricity, low frictional coefficient, high-temperature resistance, corrosion resistance and high hardness, but also has long service life.

Description

Technical field: [0001] The invention relates to a sealing ring, in particular to a molded sintered graphite sealing ring and a manufacturing method thereof. Background technique: [0002] At present, the graphite sealing rings produced in China are mainly made of hot-pressed graphite technology, that is, the powder after graphite powder and resin formulation is cured in a vulcanizer at 180°C with various types of molds for a certain period of time and then pressed. Although the hot-pressed graphite sealing ring can be used at room temperature, it is easy to deform at low temperature, wears quickly, and is not resistant to corrosion. It will deform when the temperature is higher than 100°C or when there is a corrosive medium. It is difficult to use hot-pressed graphite sealing rings in many harsh working conditions, especially when used in automobile water pumps and diesel engine cooling pumps, it is easy to cause water leakage, thereby damaging the engine and making the wat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L95/00C08K3/04C09K3/10
Inventor 李友宝励永平励才勋
Owner NINGBO DONGLIAN MECHANICAL SEAL
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