RU2527243C1 - Tribotechnical composition for metal friction units - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: tribotechnical composition for metal friction units includes serpentinite Mg₆[Si₄O₁₀][OH]₈ with content in composition in the range 30-40 wt %, chlorite H₄Mg₂Al₂SiO₉ with content in composition 20.0-30.0 wt %, barite BaSO₄ with content in composition 20.0-30.0 wt %, koalinite Al₄[Si₄O₁₀](OH)₈ with content 10.0-15.0 wt % and spherocobaltite CoCO₃ with content 10.0-20.0 wt %.

EFFECT: creation of tribotechnical composition, which accelerates smoothing of friction surfaces, optimisation of clearances and increases wear-resistance of metal and metal-containing friction pairs of different mechanisms, which extends field of its application.

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Description

The invention relates to the field of mechanical engineering, namely to the processing of surfaces of friction units, and can be used both in the processing of new parts and units of friction, and in repair and restoration work. The tribotechnical composition can find application in lifting mechanisms, equipment for mining and processing minerals, in pumping, ventilation, compressor, machine-tool equipment of various industries, automobile, railway, sea and air transport.

Tribotechnology allows for the formation of parts of friction pairs. Possibilities of achieving the required properties of friction surfaces of assemblies and parts due to various strengthening methods, applying special coatings, etc. (Friction, wear and lubrication, Moscow, Mashinostroenie, 2003, pp. 16-18.) There are a large number of different tribological compositions whose action is aimed at combating friction and wear.

A tribosystem is a complex thermodynamic system formed by the interaction of rubbing bodies, as well as the intermediate medium and parts of the environment. Wear of machine parts and assemblies is one of the main problems in mechanical engineering. Theoretical and practical solutions to the problem of friction and wear are very relevant. These solutions make it possible to more efficiently calculate and create tribological conjugate designs, select the optimal materials for friction pairs, apply new technological methods for the manufacture, processing and hardening of tribosystems, and also ensure the optimal mode of operation and repair of machines and mechanisms. Optimization of friction surfaces is the process of bringing the system to the best possible condition.

Most tribotechnical compounds that are made from minerals are serpentinite.

A known composition for processing friction pairs and a method for its manufacture (patent RU No. 2168662 IPC F16C 33/14, from 15.06.2000). The composition includes an abrasive-like powder based on magnesium hydrosilicate, which is used as natural or synthesized serpentinite, related impurities, finely divided diamond or shungite powder and a metal-containing additive - a mixture of finely dispersed metal powders forming stable systems with a base material taken from the series: chromium, nickel, molybdenum, niobium, titanium and their alloys or a fine mixture of these powders of metals, their oxides or halogens in the following ratio of components wt.%: metal containing additive - 4.8-6.7; diamond or shungite powder - 0.15-0.35; impurities - 1.5-2.0; magnesium hydrosilicate - the rest.

A disadvantage of the known composition is the combination of mutually exclusive components (a component designed to destroy the surface and a component designed to restore the surface).

A known composition for treating friction pairs (patent RU No. 2127299, IPC С10М 125/10 of 06/15/2000) containing a binder and abrasive-like component, which in addition to natural magnesium hydrosilicate contains metal oxides having a lower affinity for oxygen than iron, as well as magnetic a solid solution of these oxides with a spinel and / or pomegranate structure. The presence of these additives in the composition determines the occurrence of topochemical reactions in the friction zone, which ensure the formation of a servo-like film firmly bound to the base, which reduces the wear of the friction unit elements.

The disadvantage of this composition is the high content of the abrasive-like component, which only smoothes the surface, which significantly reduces friction, but with this method of surface treatment, the gap in the friction pair only increases, which entails increased vibration and, as a result, a significant reduction in the service life of the mating assembly.

Closest to the proposed tribotechnical composition is a known composition for optimizing gaps and increasing wear resistance of metal and metal-containing tribosystems (application RU No. 2008142199, IPC С10М 125/10 of 10.24.2008), containing serpentinite 30.0-40.0%, biotite 20 , 0-30.0%, chlorite 15.0-30.0%, barite 5.0-10.0%, magnetite 1.0-3.0%, millerite 0.5-2.0%, kaolin 0 , 3-1.5%, biotite 20.0-30.0% and millerite 0.5-2.0%.

The disadvantage of this composition is that it is complex in composition, and the recovery rate of the friction surfaces is insufficient.

The technical result, which consists in eliminating the noted drawbacks, in the proposed tribological composition for metal friction units, including serpentinite Mg ₆ [Si ₄ O ₁₀ ] [OH] ₈ with a content in the composition in the range of 30-40 wt.%, Chlorite H ₄ Mg ₂ Al ₂ SiO ₉ with a content in the composition of not more than 30 wt.%, Barite BaSO ₄ and coalinite Al ₄ [Si ₄ O ₁₀ ] (OH) ₈ , is achieved by the fact that spherocobaltite CoCO ₃ with a content in the composition of 10.0 is introduced -20.0 wt.%, And the barite content in the composition is 20.0-30.0 wt.%, The chlorite content is 20.0-30.0 wt.%, And koalis ita -. 10.0-15.0 wt%.

The proposed tribotechnical composition allows to accelerate the alignment of friction surfaces, optimize gaps and increase the wear resistance of metal and metal-containing friction pairs of various mechanisms, which expands the scope of its application.

The proposed tribotechnical composition consists of a finely dispersed mixture of natural minerals (see table No. 1), selected according to the energy density of their crystal lattices and structure, as well as in accordance with numerous tests of various combinations of these compositions.

Table No. 1 No. p / p Title Chemical formula Content, wt.% one Serpentinite (serpentine) Mg ₆ [Si ₄ O ₁₀ ] [OH] ₈ 30.0-40.0 2 Barite Baso ₄ 20.0-30.0 3 Chlorite H ₄ Mg ₂ Al ₂ SiO ₉ 20.0-30.0 four Spherocobaltitis COCO ₃ 10.0-20.0 5 Kaolinite (titanic nakrit) Al ₄ [Si ₄ O ₁₀ ] (OH) ₈ 5.0-10.0

Serpentinite or a coil is a dense rock formed as a result of a change (serpentinization) of hyperbasites during a metamorphism of igneous rocks of the peridotite and picrite groups, sometimes also dolomites and dolomite limestones.

Barite (heavy spar) is a barium mineral from the sulfate class.

Chlorite is a group of mica-like minerals from the subclass of sheet silicates of the silicates class.

Spherocobaltite is a mineral, cobalt carbonate.

Kaolinite is a clay mineral from the group of aqueous aluminum silicates.

The percentage of minerals in the finished compositions varies in the above ranges depending on the material of the mating parts, the load in the friction pair, and also the time to optimize the gap.

The proposed composition goes through the following stages of manufacture:

1. Preparation of feedstock;

2. Mechanical activation (grinding);

3. Selection (magnetic);

4. Cavitation treatment;

5. Drying;

6. Dispersion (optional).

The composition provides a qualitative and quantitative selection of natural minerals and cooking according to the specified technology.

In the proposed composition, the composition of the ingredients with the addition of spherocobaltite CoCO _{3 is} optimized.

Example 1

A composition was prepared with the following ingredients:

p / p Ingredient name wt.% one Serpentinite thirty 2 Barite 25 3 Chlorite twenty four Spherocobaltitis fifteen 5 Kaolinite rest

The resulting composition was used to restore the construction equipment "Olympstroy".

As a result of applying the composition, the vibration level of the internal combustion engine of BelAZ’s quarry decreased by 30% after 15 minutes of operation, and further observation of this vehicle showed that the achieved passport values of the technical characteristics of the internal combustion engine are stored for at least 2 years or at least 6,000 hours.

Example 2

A composition was prepared with the following ingredients.

№№ Ingredient name wt.% one Serpentinite 40 2 Barite twenty 3 Chlorite 25 four Spherocobaltitis 10 5 Kaolinite rest

The resulting composition was used for heavily loaded bearings with a service life of several days to 6 months (vibration tables, mill pumping, ventilation equipment). The use of the composition showed a decrease in the critical temperature to acceptable within 10 minutes, exit from the red zone (wear 75-100%) to the yellow zone (wear 50-75%) within 20 minutes, return to the green zone (wear to 50%) in 4 hours, and the resource of bearings treated with the composition increased by more than three times.

The tests were carried out on the equipment of the cardboard factory, oil refinery, boiler houses and utilities, quarry crushers.

Example 3

A composition was prepared with the following ingredients.

No. p / p Ingredient name wt.% one Serpentinite thirty 2 Barite twenty 3 Chlorite 25 four Spherocobaltitis twenty 5 Kaolinite rest

The resulting composition was used for open friction pairs.

The wheel-rail friction pair on the overhead crane of the metallurgical plant was restored within seven days (the operation mode of the friction pair is slow, heavily loaded), the service life of the wheels is 24 days, the machined wheels serve more than two terms.

The technical result of the invention is that the proposed tribological composition provides:

1. Optimization of the gaps in the friction pair in the shortest possible time (the first changes occur after 10 minutes of operation);

2. The increase in wear resistance of friction pairs;

3. Restore surface geometry;

4. Universality in the processing of friction pairs made of various materials.

Tribotechnical composition has been tested in industry laboratories and is in demand among engineering and mechanical repair enterprises.

Claims (1)

Tribotechnical composition for metal friction units, including serpentinite Mg₆[Si_fourO₁₀] [OH]₈ with a content in the composition in the range of 30-40 wt.%, chlorite H_fourMg₂Al₂SiO₉ with a content of not more than 30 wt.%, BaSO barite_four and Coalinite Al_four[Si_fourO₁₀] (OH) ₈ ,different the fact that spherocobaltite CoCO is introduced into the composition₃ with a content in the composition of 10.0-20.0 wt.%, and the barite content in the composition is 20.0-30.0 wt.%, the chlorite content is 20.0-30.0 wt.%, and koolinite - 10 0-15.0 wt.%.