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Home Material Sciences Antifrictional Coatings On The Base Of Fluorocontaining Components

Antifrictional Coatings On The Base Of Fluorocontaining Components


Protection of machine and mechanisms from wearing is actual problem of modern industry. This is caused by the necessity to perform intensive researches and search of lubricated material and new components that will improve their operating characteristics. However, some severe operation conditions (high and low temperatures, deep vacuum, ionizing radiation, absence of availability of friction surface for periodical oil supply and etc.) exclude using of gaseous, liquid and plastic lubricated materials in triboconjugation units. Therefore, in recent years, direction of solid lubricated coatings (SLC) creation has essentially developed. These coatings are the composition on the base of thermostable polymer matrix with solid powdered superfine filler. Introduction of fluorinated groups into macrochains of polymers, as a rule, enhances its thermal and hydrolitic stability. It is the most efficiently for perfluorinated systems. The weak inter-molecular forces on the interface air–solid of the fluorinated polymers lead to the formation of the surfaces with the extremely low free energy that is characterized by poor adhesion and low friction factor. In fluorinating the surface of polymer by elementary fluor or inorganic fluorides one can reduce critical surface tension to a level that is typical for polytetrafluoroethylene (0,018 N/m).

Of great interest is the use of thermostable polymer matrix and fluorinated components for the treatment of conjugated surfaces in micro– and nanoelectromechanical systems (MEMS and NEMS). In that case, Lagmuir – Blodgett (LB) and self–assembly (SA) technologies are applied to obtain antifriction coating. These technologies are associated with the making of complex molecular assemblies by means of molecular film–by–film transfer on the appropriate substrates.

Innovative Aspect and Main Advantages

The system of “polyamide – epoxy oligomer” was used as the binding agent for solid lubricated coating (SLC) making for the first time.

Apart the binding agent the following components were the part of composition: antifrictional fillers, the friction polymer forming additive, antioxidants and systems of the solvents.

Characteristics of the coatings used in aviation

  1. Working life is 50-60 times as much as metalfluoroplastics band;
  2. Friction factor 0,05 – 0,15 (load P=20 MPa; V=0,78m/s);
  3. Load to scoring – 5000 N (three times as high as metalfluoroplastic band);
  4. Maximum specific load 100 MPa;
  5. Operating temperature range -196 + 18oC;
  6. Wear rate 10-7 – 10-9

Characteristics of the coatings for robot systems

  1. Cumulative operating time of air cylinder with SLCs - 1000 000 cycles;
  2. Breakloose pressure reduces half;
  3. Chrome – plating stage of air cylinder internal face is deleted

Areas of Application

The fluorocontaining SLC is intended for providing rubbing part serviceability in working assemblies of mechanisms and machines without using liquid lubricants and greases. Proposed SLCs were first used in leading–edge flope control assemblies of ANTONOV – 70 cargo aircraft (O. K. Antonov ANTK). Prolonged testing (from 1995) have shown good results. Proposed SLCs were used in robot systems. They were applied over the internal face of air cylinder technical robot working in radioactive zone.

Fig. 1 Fields of coatings application and coatings before (a) and after (b) friction

Stage of Development

1. The fluorocontaining composition is patented.
2. The technology of obtaining of laboratory lots of the product is developed.
3. Technical conditions for polymer and SLC composition are also developed.

Contact Details

Sheludko E. V., Ph.D., Senior Researcher
Institute of Bioorganic Chemistry and Petrochemistry of NASU
50, Kharkovskoye highway, Kiev, 02160, Ukraine
Tel.: +38044-559-7181
Fax: +38044-559-9800
E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

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