Antifriction coating

FIELD: machine building.

SUBSTANCE: proposed antifriction coating comprises molybdenum disulphide and binder. Said binder represents organic silicon compound. Diamond nanoparticles are additionally introduced in coating composition.

EFFECT: higher operating temperatures and wear resistance.

5 cl, 1 ex

 

The technical field

The invention relates to the field of engineering, namely, anti-friction coatings used in bearings and other mates to reduce friction and wear on steel parts under the action of high temperatures and high loads, in particular when using coatings for gas-dynamic radar bearings.

Characteristic analog

Known antifriction composite coating (see RF patent №2211260)containing a solid lubricant containing molybdenum disulfide and graphite, and a binder based on epoxy resin, characterized in that the coating consists of three layers, the lower of which is adjacent to the substrate, made of a thickness of 10-15 μm of molybdenum, the upper consists of a solid lubricant, optionally containing cadmium oxide and has a thickness of 1-3 μm, and the intermediate layer contains a binder and a thickness of 15-50 microns.

The coating is operable in air and in water at temperatures from -100°C to +250°C and specific loads up to 20 kgf/mm2and has a coefficient of friction <0,1.

The disadvantage of analogue is the inability of its operation at temperatures above 250°C due to decomposition of epoxy resin and accelerated wear.

Characteristics of prototype

The closest analogues of is anti-friction solid lubricant coating (see RF patent №201800), containing molybdenum disulfide, colloidal graphite and a binder, characterized in that the coating as a binder contains epoxy-novolak varnish and additionally contains whiskers of silicon carbide - modification-ratio of length to diameter of 30-300 in the following ratio, wt.%:

Molybdenum disulfide 50-70

Colloidal graphite 7-20

Whiskers of silicon carbide -

modification ratio

length to the diameter of 30-300 0,15-1,1

Epoxy-novolak lacquer - rest.

The disadvantage of the prototype as well as the similar is the inability of its operation at temperatures above 250°C due to decomposition of epoxy-novolak varnish and accelerated wear.

Technical task

Technical problem arising from the prior art, is to increase operating temperatures antifrictional coverage and increase its durability.

The technical problem is solved due to the fact that the claimed anti-friction coating contains molybdenum disulfide and a binder. Differs in that it uses a silicone binder. Additionally included in the diamond nanoparticles.

The use of silicon binder allows to increase the working temperature of the claimed coating without decomposition.

With the introduction of the diamond particles in the coating composition of the diamond nanoparticles, the region is giving a high surface energy, occurs on the one hand the seal of binding molecules around the nanoparticles, and on the other hand - grip of these diamond nanoparticles protected with a metal surface. This leads to increased wear resistance of the inventive coating in comparison with the prototype and increased operating temperatures up to 500°C.

Diamond nanoparticles introduced into the composition in an amount of 0.1 to 0.2% by weight of the coating, which is the optimal amount of diamond nanoparticles for tasks.

As organosilicon binder resin is used, which is part of the lacquer KO-08, which is one of the use cases silicone binder in the inventive coating.

The coating thickness of 25-30 μm, which is sufficient for the tasks.

The size of the diamond nanoparticles is 4-6 nm. The proposed device is new, because it is not known from the prior art.

The invention involves an inventive step, since it is for the expert is not obvious from the prior art.

An example of specific performance

Consider using antifrictional heat-resistant coatings for gas-dynamic radar bearings operating at temperatures up to 500°C.

For the preparation of anti-friction coatings were used the following components:

Molybdenum disulfide brand DM-1 TU 48-19-133-85.

- Silicone binder - lacquer KO-08, GOST 15081-78 representing a solution of polymethylphenyl siloxane resin in toluene, GOST 9880-76.

Powder of diamond nanoparticles with a size of 5 nm.

Presents the components are mixed. Is added to the solvent - toluene to the desired viscosity of the mixture - 12-14 sec VZ-4. The resulting composition is applied on a protected surface with the spray gun in two layers with intermediate drying between coats at 20 minutes at a temperature of 15-35°C. After application of the second layer second layer first dried for 20 minutes at a temperature of 15-35ºC, and then produce a final drying at a temperature of 150-180°C for 60 minutes, the coating Thickness should be 25-30 microns.

The use of silicone lacquer KO-08 allows you to increase the operating temperature of the claimed coating without its decomposition to 500°C and loss of mechanical strength.

With the introduction of the diamond particles in the coating composition of diamond nanoparticles with high surface energy occurs on the one hand the seal of binding molecules, and on the other hand - grip of these diamond nanoparticles protected with a metal surface. This leads to increased wear resistance of the inventive coating in comparison with the prototype and increased operating temperatures up to 500ºC.

Thus, thanks to the new GSS is upnote essential features of the claimed device to perform fully the goal of the project, resulting from the prior art, and therefore, it meets the criterion of "industrial applicability".

The invention is undergoing pilot testing.

Planned repetitive use of the inventive coatings in gas production and gas processing industry, in particular to cover petal gas-dynamic bearings used in domestic gas turbines, including the turboexpanders.

1. Anti-friction coating containing molybdenum disulfide and a binder, characterized in that the used silicone binder, optionally included in the diamond nanoparticles.

2. Anti-friction coating according to claim 1, wherein the diamond nanoparticles introduced in an amount of 0.1-0.2% of the total mass.

3. Anti-friction coating according to claim 1, characterized in that the organosilicon binder resin is used, which is part of the lacquer KO-08.

4. Anti-friction coating according to claim 1, characterized in that the coating thickness of 25-30 μm.

5. Anti-friction coating according to claim 1, characterized in that the size of the diamond nanoparticles is 4-6 nm.



 

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19 cl, 4 tbl, 4 ex

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