RU2623538C1 - Method of modification of iron-containing surfaces of friction units - Google Patents

Abstract

FIELD: machine engineering.

SUBSTANCE: friction surfaces are fed to the treatment zone of a pre-prepared process medium containing a hydrocarbon carrier and 0.01 to 0.15 wt % of the pre-crushed mixture of minerals shungite, kaolinite, talc, dolomite, carbon black, sulfur of a colloidal and surfactant (surfactant) with the following ratio of them in a mixture, wt %: shungite - 0.5…10, kaolinite - 0.1…30, talc - 0.1…25, dolomite - 2…20, gas black - 1…8, sulfur colloid - 0.1…10, surfactant - 2…5. The dispersion of particles of mineral components and surfactants is 0.1…10.0 mcm. In particular embodiments of the invention, the mentioned mixture of minerals uses an increased content of natural fullerenes in the shungite. In mentioned mixture of minerals, black and gas colloidal grease is used as antifriction components used as solid lubricants to reduce the degree of abrasion of kaolinite, talc and dolomite when modifying the contacting surfaces.

EFFECT: increasing the efficiency and intensity of formation in the near-surface layers of the friction surfaces of a modified protective antifriction layer of increased wear resistance.

3 cl, 1 tbl

Description

The invention relates to methods for modifying the surfaces of friction units and is intended to reduce mechanical friction losses, increase the durability of rubbing metal surfaces in internal combustion engines, transmission units, chassis of vehicles and other machines, machine tools and can be used to simultaneously restore metallic rubbing surfaces.

A known method of modifying metal surfaces with a composition / Patent of the Russian Federation No. 2168662 /, including abrasive-like powder based on magnesium hydrosilicate, using natural or synthesized serpentenite, impurities accompanying it, fine powder of diamond or schungite and a metal-containing additive - a mixture of fine powders metals selected from a base metal and metals forming stable systems with a base material taken from the series chromium, nickel, molybdenum, niobium, titanium and their alloys, or finely a dispersed mixture of these powders of metals, their oxides or halides in the following ratio of components, wt. %: the specified metal-containing additive is 4.8-6.7; fine powder of diamond or shungite - 0.15-0.35; impurities - 1.5-2.0; said magnesium hydrosilicate — the rest.

The disadvantages include a slight increase in hardness and reduced wear, friction coefficient and the inability to compensate for lost sizes.

The known method / RF Patent No. 2169172 /, used as an additive obtained on the basis of finely dispersed serpentinites, to the lubricants of internal combustion engines, mechanisms and devices, to diesel fuel or and the quality of solid lubricants. The composition is a natural ground mineral with a dispersion of 0.01-5 microns in the following ratio of components, wt. %: serpentine (lysardite and chrysotile) Mg ₆ {Si ₄ O ₁₀ } (OH) ₈ 87.4-88.0; iron in an isomorphic impurity 8.2-8.6; aluminum in an isomorphic impurity 2.2-2.4; silica 0.6-1.0; dolomite CaMg (CO ₃ ) ₂ 0.6-1.0.

The disadvantages include the fact that, firstly, the presence of aluminum in the friction zone during lean lubrication (oil starvation) leads to the formation of aluminum oxide - the strongest abrasive, and, secondly, the composition cannot be recommended for use in the process of rolling knots friction, manufactured or repaired technical objects.

The closest analogue is the composition / Patent of the Russian Federation No. 2199609 / containing base oil and powder, including amorphous silicon dioxide, a catalyst, the supply of repair and restoration composition to the friction zone and the formation on the friction surface of the coating in the normal mode of operation of the mechanism, and using powder obtained chemically from industrially produced reagents, additionally containing magnesium silicates, ferrosilicates and aluminosilicates in the following ratios of components, wt. %: amorphous silicon dioxide 20-70; magnesium silicates 10-50; ferrosilicates 5-25; aluminosilicates 2-15; catalyst rest. The amount of catalyst is from 0.01%.

As a catalyst, industrially produced modifications of carbon or a mixture of industrially produced modifications of carbon: graphite and black carbon are used. The dispersion of the powder for the repair composition has a value of up to 40 microns. The powder is up to 30 wt. % repair composition, base oil - the rest.

The disadvantages include high dispersion (up to 40 microns), which does not allow the composition to be used for processing precision parts of diesel fuel and hydraulic equipment.

The technical result consists in increasing the efficiency and intensity of the process of formation in the surface layers of parts of friction units of a modified protective antifriction layer of increased wear resistance.

To solve the technical problem, a method for modifying iron-containing friction surfaces is proposed, according to which a pre-prepared technological medium having a hydrocarbon carrier and 0.01-0.15 wt. % pre-crushed mixture of minerals schungite, kaolinite, talc, dolomite, carbon black, sulfur colloidal and surfactants in the following ratio in the mixture, wt. %: shungite - 0.5 ... 10; kaolinite - 0.1 ... 30; talc - 0.1 ... 25; dolomite - 2 ... 20; gas soot - 1 ... 8; colloidal sulfur - 0.1 ... 10; Surfactant - 2 ... 5, the dispersion of particles of mineral components and surfactants is 0.1 ... 10.0 microns.

The invention is aimed at increasing the efficiency and intensity of the process of formation in the surface layers of parts of friction units of a modified protective antifriction layer of increased wear resistance.

In order to confirm the technological process of modifying worn-out and in-use iron-containing friction surfaces, as a result of which the geometry of the friction surfaces of machine parts is simultaneously aligned, the gaps in the mating surfaces of the friction surfaces are optimized, as well as their durability is increased due to increased wear resistance and improved antifriction properties, tests were carried out slip friction pairs. The tests were carried out in order to determine the effect of the modification technological process on the value of the friction moment, temperature in the friction zone (friction machine 2070 SMT-1 according to the “roller-block” scheme).

To implement the research process, sliding friction was modeled according to the “chrome roller - cast-iron block” scheme, which imitates a friction pair “compression ring - engine cylinder liner”. To accelerate tests by the criterion of specific load, the diameter of the inner generatrix of the cast-iron block was two times higher than the outer diameter of the chrome roller. Tests and measurements were carried out according to standard methods, the research results are presented in table 1.

For the tests, a technological medium was used containing the base mineral oil M-10G2K and the repair composition in the following ratio, wt. %: RVS - 0.1, base oil - the rest.

Repair and recovery composition was prepared in the following ratio of ingredients, wt. %: shungite - 5; kaolinite - 28; talc - 25; dolomite - 20; gas soot - 8; colloidal sulfur - 9; Surfactant - 5.

The dispersion of the mineral components was in the range 0.1 ... 10.0 μm, sodium bicarbonate was used as a surfactant.

Test conditions: stepwise load increase of 100-200-300 N, roller rotation speed of 3.2 m / s, the duration of each experiment is 60 minutes, the experiment is repeated 5 times.

An analysis of the obtained results suggests that the reduction in mechanical losses (indirectly through the moment of friction) in comparison with the analogue and prototypes reaches 3 ... 46%, the decrease in heat stress of the friction units is 5 ... 24%, thereby confirming the advantages of the proposed variant of tribotechnical processing over existing ones.

Claims (3)

1. A method of modifying iron-containing friction surfaces, comprising supplying a pre-prepared technological medium containing a hydrocarbon carrier and 0.01-0.15 wt. % pre-crushed mixture of minerals schungite, kaolinite, talc, dolomite, carbon black, sulfur colloidal and surfactants in the following ratio in the mixture, wt. %: schungite - 0.5 ... 10, kaolinite - 0.1 ... 30, talc - 0.1 ... 25, dolomite - 2 ... 20, gas soot - 1 ... 8, colloidal sulfur - 0.1 ... 10, surfactant - 2 ... 5, while the dispersion of particles of mineral components and surfactants is 0.1 ... 10.0 microns. 2. The method according to p. 1, characterized in that the said mixture of minerals uses shungite with a high content of natural fullerenes. 3. The method according to p. 1, characterized in that in the said mixture of minerals as antifriction components used as solid lubricants, gas soot and colloidal sulfur are used to reduce the degree of abrasive effect of kaolinite, talc and dolomite when modifying contact surfaces.