Antifriction self-lubricating composition

 

(57) Abstract:

Described anti-friction self-lubricating composition containing copper oxide, abietic acid, characterized in that it further comprises vaseline oil, graphite, copper fiber, grease and polyamide in the following ratio, wt.%: copper oxide - 7,1-10; abietic acid - 3,5-6,7; vaseline oil - 3,5-6,7; graphite - 3,5-6,7; copper fiber - 3,5-6,7; grease - 10-10,6; polyamide - rest. The friction coefficient of the composition is 0.025-0.03, running-in period is 30-40 min, the wear rate of the composition 110-10the tensile strength of the material in compression 72-76 MPa. The performance properties of the composition is high.

The invention relates to antifriction self-lubricating compositions based on polyethylene and can be used in various fields of mechanical engineering, instrument engineering, aircraft and shipbuilding, in particular for the manufacture of shell bearings, sliding guides and bearings operating without lubricant in the air.

Known antifriction self-lubricating composition (see C. A. White, A. I., Sviridenko and other Friction and wear of materials based on field ratio of components wt.%:

Polytetrafluoroethylene - 60

Copper oxide - 40

The disadvantage of this anti-friction composition is high coefficient of friction without lubrication.

Known composition (see A. C. 859427, USSR, MKI With 10 M 3/01, 3/14. B. I. 32, 1981, S. 123) for friction units containing glycerol, formaldehyde, glycerin sulfuric acid copper, acid sulphuric acid potassium, hydroquinone, aluminium chloride and epoxy resin.

The disadvantages of this lubricant composition for friction is: the composition is a liquid substance that can only be used as a lubricant.

Known antifriction self-lubricating composition based on epoxy resins (see A. C. Chichinadze. Polymers in friction units of machines and devices. - M.: Mashinostroenie, 1980, S. 31) containing epoxy resin, polytetrafluoroethylene - 40-50 wt.%.

The disadvantage of this composition is the high coefficient of friction without lubrication.

The closest technical solution to offer is antifriction self-lubricating composition based on epoxy resins (see A. C. 1744104, USSR, MKI With 10 M 141/10. B. I. 24, 1992, S. 111-112) containing polytetrafluoroethylene, copper oxide, glycerin, abietic acid, the components, wt.%:

Polytetrafluoroethylene - 1-3

Copper oxide - 16-21

Glycerin - 9-11

Abietic acid - 16-20

Ester of pentaerythritol and palmitic acid - 0,2-0,5

Triphenylphosphine - 0,05-0,1

Epoxy resin - Rest

The friction coefficient of the composition is within 0,04-0,09, the wear rate within 1,310-8-1,2510-10.

The disadvantage of this composition is not sufficiently low value and insufficient stability of the coefficient of friction without lubrication.

The objective of the invention is improving sliding properties, wear resistance and toughness of the composition.

This task is solved in that the composition contains copper oxide, abietic acid, vaseline oil, graphite, copper fiber, grease and polyamide, in the following ratio, wt.%:

Copper oxide - 7,1-10

Abietic acid - 3,5-6,7

Vaseline oil - 3,5-6,7

Graphite - 3,5-6,7

Copper fiber - 3,5-6,7

Grease - 10-10,6

Polyamide - Rest

The components of the composition are substances of technical purity. At the same time as polyamide and grease can be applied to various polyami the ol synthetic (GOST 4366-76), the grease fat MUSTACHE (GOST 1033-73), General-purpose grease lithol-24 (GOST 21150-75). The function of the grease is to provide a plasticizing composition of lubricating oils and effective retention of oil in the composition.

The proposed antifriction self-lubricating composition was obtained on the following technology.

In a drying Cabinet at a temperature of 60-80oWith should be dried powder of cuprous oxide to the content of moisture of 0.25%. After this is accomplished through the preparation of sample components in accordance with the ratio above, preparation, mixing and gradual heating of the mixture to a temperature of 220oIn the crucible before the formation of lumps. After melting the mixture, the mixture is placed in a mold and heated to a temperature of 240oWith, and is cooled together with the mold. Make the extraction of the sample composition from the mold.

Example 1. The content of the components, taken for example 1 anti-friction self-lubricating composition, wt.% (the lower limit of the content of the filler):

Copper oxide - 7,1

Abietic acid is 3.5

Vaseline oil - 3,5

Graphite - 3,5

Copper fiber - 3,5

Grease the grease Swosti coefficient values are high, the running-in period is 30-40 min, the wear rate of the composition is 1,210-8the tensile strength of the material in compression 90 MPa. The complex properties of the composition can be assessed as meeting operational requirements.

Example 2. Components for example 2, taken in the same proportion as in example 1, wt.%:

Copper oxide - 7,1

Abietic acid is 3.5

Vaseline oil - 3,5

Graphite - 3,5

Copper fiber - 3,5

Grease the grease MUSTACHE - 10

Polyamide P-66 - 68,9

The coefficient of friction of the composition - 0,035-0,045, duration running 30-40 minutes wear - 1,310-8the tensile strength of 85 MPa. The performance properties of the composition are satisfactory.

Example 3. Components for example 3 taken in the following ratio, wt.%:

Copper oxide - 7,1

Abietic acid is 3.5

Vaseline oil - 3,5

Graphite - 3,5

Copper fiber - 3,5

Grease lithol-24 - 10

Polyamide P-68 - 68,9

The friction coefficient of the composition is 0.03 to 0.04, the running-in period - 40-60 min, the wear rate of 10-8the tensile strength of the material in compression 85-87 MPa. The performance properties of the composition are satisfactory.

Copper oxide - 10

Abietic acid - 6,7

Vaseline oil - 6,7

Graphite - 6,7

Copper fiber - 6,7

Grease the grease - 10,6

Polyamide P-68 - 52,6

The friction coefficient of the composition is a 0.035-0.04; the running-in period - 30-50 minutes wear - 110-9the tensile strength of the material in compression 75 MPa. The performance properties of the composition are satisfactory, the strength dropped slightly.

Example 5. Components for example 5 taken in the following ratio, wt.%:

Copper oxide - 10

Abietic acid - 6,7

Vaseline oil - 6,7

Graphite - 6,7

Copper fiber - 6,7

Grease the grease MUSTACHE - 10,6

Polyamide P-66 - 52,6

The friction coefficient of the composition is 0.03 to 0.04, the running-in period is 20-30 min, the wear rate 1,310-9the tensile strength of the material in compression 70-75 MPa. The performance properties of the composition are satisfactory.

Example 6. The content of the components, taken for example 6, the following, wt. %:

Copper oxide - 10

Abietic acid - 6,7

Vaseline oil - 6,7

Graphite - 6,7

Copper fiber - 6,7

Grease lithol-24 - 10,6

Polyamide - 52,6

To the - 10-10the tensile strength of the material in compression 70 MPa. The operating characteristics of the composition are satisfactory.

Example 7. The content of the components, taken for example 7 anti-friction self-lubricating composition, wt.% (the average contents of the most significant components):

Copper oxide - 10

Abietic acid - 5

Vaseline oil - 5

Graphite - 5

Copper fiber - 5

Grease the grease MUSTACHE - 10,6

Polyamide P-68 - 59,4

The friction coefficient of the composition is 0.025-0.03, running-in period is 30-40 min, the wear rate of the composition 110-10the tensile strength of the material in compression 72-76 MPa. The performance properties of the composition is high.

Test compositions were produced in air (dry friction) on the machine friction on a "per partial insert" at sliding velocity of 0.15 m/s, specific pressure of 2.5 MPa. The counterbody was made of steel 45 with the surface roughness Rand- 0.63 (tempering to a hardness of 37 HRC). Linear wear was determined reference points on optimate with multiplier 1 micron.

Was also conducted tests to determine the strength of the composition under compression.

The tests showed that the contents of the components, taken below the lower limit, does not provide a positive effect, while exceeding the upper limit of the content of the components does not lead to a significant improvement of tribological characteristics and causes a decrease in mechanical strength of the composition.

The proposed arrangement provides the possibility of creation by lowering the coefficient of friction of less energy-intensive and material-intensive friction.

Antifriction self-lubricating composition containing copper oxide, abietic acid, characterized in that it further comprises vaseline oil, graphite, copper fiber, grease and polyamide in the following ratio, wt. %:

Copper oxide - 7,1 - 10

Abietic acid - 3,5 - 6,7

Vaseline oil - 3,5 - 6,7

Graphite - 3,5 - 6,7

Copper fiber - 3,5 - 6,7

Grease - 10 - 10,6

Polyamide - Rest

 

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