RU2247767C2 - Solid-lubricating composition and method for coating of rubbing surface using the same - Google Patents

Abstract

FIELD: tribotechnic, in particular coat for surface of friction assembly, containing solid-lubricating composition.

SUBSTANCE: claimed solid-lubricating composition contains (mass %): quartz 15-20; getite 5-10; brusite 3-8; surfactant 2-7; and balance: lysardite. Starting mixture is crushed to obtain composition with dispersion of 40 mum. Then composition (0.1-2.0 mass %) is mechanically activated with binder (99.9-98 mass %), located between rubbing surfaces with subsequent bedding.

EFFECT: friction assembly with improved mechanical properties and merits.

2 cl, 2 ex

Description

The invention relates to tribotechnology, in particular to a solid lubricant composition and a method for forming a coating on the working surfaces of friction units; it can be used in mechanical engineering for processing friction units, as well as in the operation of various mechanisms and machines to extend the overhaul life or during repair and restoration operations.

In the mid-90s, a number of technical solutions appeared, according to which solid-lubricating compositions containing dispersed minerals, including natural magnesium hydrosilicates, such as serpentine, talc, serpentinite, and abrasive-like particles, are needed to form an antifriction coating on rubbing surfaces. at the processing stage, and during the operation of friction units (RF patents No. 2035636 C1, 05.20.1995, No. 2057257 C1, 03/27/1996, No. 2059121 C1, 04/27/1996)

The presence of the powder of these compounds in the lubricating composition under certain conditions of its use between the rubbing surfaces and their running-in leads to the formation of so-called servo film on the rubbing metal surfaces, which significantly changes their wear.

The closest similar solution to the proposed invention is a solid lubricant composition and a method for forming a coating on rubbing surfaces using it according to the patent of the Russian Federation No. 2179270 C1, 02/10/2002. According to a known solution, a solid lubricant composition for forming a coating on rubbing surfaces based on a crushed initial mixture of minerals contains serpentine in the form of a mixture of chisotyl asbestos, ofite, antigorite and lysardite, taken in mass parts, respectively, 1: 2.5-4.0: 1.5 -3.0: 2.0-3.5, amphibole, pyrophyllite, surfactant, in the following ratio of ingredients in the composition, wt.%: Amphibole 2-5, pyrophyllite 8-10, surfactants 5-15 serpentine rest.

A method of forming a coating on rubbing surfaces using a known solid lubricant composition is to grind the initial mixture of minerals containing serpentine in the form of a mixture of chisotyl asbestos, ophite, antigorite and lysardite, with the addition of a surfactant, to obtain a solid lubricant composition with a dispersion of 1-40 microns, its mechanical activation with a binder, the placement of the obtained composition between the rubbing surfaces and its subsequent running-in, while placed between the rubbing surfaces, the composition contains, wt.%: solid lubricant I have a composition of 0.5-2.5, communication - the rest.

The known solution can significantly reduce the coefficient of friction, increase corrosion resistance.

However, since the strength and antifriction characteristics of the servo-like film depend on many factors: on the conditions for preparing the composition, its composition, running-in after insertion between the friction surfaces, on the condition of these surfaces, the task is to increase the strength, wear resistance of the coating, accelerate the running-in of the friction units, and reduce the friction coefficient , improving the mechanical and operational characteristics of machines and equipment is still relevant.

To solve this problem, a real solid lubricating composition is proposed that forms a coating on rubbing surfaces, and a method for forming a coating using it.

According to the invention, the claimed composition for forming a coating on rubbing surfaces based on a crushed initial mixture of minerals contains quartz, goethite, brucite, lizardite and surfactant with the following ingredients, wt.%:

Quartz 15-20

Goethite 5-10

Brucite 3-8

Surfactant 2-7

Lizardite Else

The method of forming a coating on rubbing surfaces according to the invention includes grinding the initial mixture of minerals containing lysardite, quartz, goethite, brucite with the addition of surfactants, obtaining a solid lubricant composition with a dispersion of 1-40 microns, containing ingredients in the following ratio, wt.%: Quartz 15-20 goethite 5-10, brucite 3-8, surfactant 2-7, lysardite - the rest, mechanical activation of the composition with binders, placing the resulting composition between the rubbing surfaces and its subsequent running-in, while placed between the rubbing surfaces the composition comprises, in weight.%:

Solid lubricant composition 0.1-2.0

Binders Else

The invention provides for the use of a binder on any basis: mineral oils (motor, industrial, etc.), fuels and synthetic oils, greases (such as lithol, solid oil, etc.) or a technological binder prepared according to a special recipe, as well as any surface -active substances used as dispersants in grinding.

The tribotechnical effect of the proposed solution is achieved equally on various binders and surfactants with the above qualitative and quantitative composition of the solid lubricant composition.

The following examples illustrate the present invention.

Example 1

The following minerals are used to prepare the solid lubricant composition in the following amounts: quartz - 15 g, goethite - 10 g, brucite - 5 g, surfactant (OP-7) - 5 g, lizardite - 65 g. The components are mixed in the attritor, controlling the degree of grinding ( 15 μm). The solid lubricant composition in an amount of 10 g is subjected to mechanical activation by ultrasound with a binder based on I-8 oil, taken in an amount of 990 g.

The resulting composition, hereinafter referred to as MMT (mineral friction modifier), is placed in the calculated amount between the rubbing surfaces and run in between.

The experimental data on the introduction of MMT technology (according to the invention) show that, for example, as a result of the composition of example No. 1 of the crankshaft, connecting rod and cylinder-piston groups, crossheads of a crosshead reciprocating compressor with a rectangular arrangement of double-acting cylinders 302 B 11, it became gain design pressure in the receiver for 7 minutes. (26%) faster (i.e. compressor performance increased by 26%), while the current consumption in stationary mode decreased by 36 A (11%).

Example No. 2

Similarly to Example No. 1, a solid lubricant composition was prepared containing: quartz 20 g, goethite 5 g, brucite 8 g, surfactant (OP-7) 7 g, lysardite 60 g, having a grinding degree of 30 μm. After mechanical activation, the resulting composition was used to process the internal combustion engine, preliminary diagnostics of which showed reduced compression in the cylinders. The condition of the piston rings and the crank mechanism is nominal when the liner wear is uneven up to 50%. After twofold processing of the engine with an MMT compound, after processing it in normal operation two thousand kilometers, a control diagnosis was carried out. The engine was balanced, the compression in the cylinders leveled off and increased to the rated values, the working cylindrical surfaces of the piston group liners were restored and have dimensional tolerances higher than the rated parameters.

Claims (2)

1. Solid lubricant composition for forming a coating on rubbing surfaces based on a crushed initial mixture of minerals, including lysardite, and containing a surfactant, characterized in that the initial mixture of minerals additionally contains quartz, goethite and brucite with the following ingredients in the composition , wt.%: Quartz 15-20 Goethite 5-10 Brucite 3-8 Surfactant 2-7 Lizardite Else 2. A method of forming a coating on rubbing surfaces, including grinding the initial mixture of minerals, including lysardite, with the addition of surfactants, obtaining a solid lubricant composition with a dispersion of 1-40 microns, mechanically activating it with a binder, placing the resulting composition between the rubbing surfaces and its subsequent running-in, characterized in that use the initial mixture of minerals containing lysardite, quartz, goethite and brucite, get a solid lubricant composition containing the ingredients in the following ratio, wt%: quartz 15-20, get 5-10 m, brucite 3-8, 2-7 surfactants, lizardite - the rest, and rubbing surfaces located between the composition comprises, in weight%:. Solid lubricant composition 0.1-2.0 Binder Else