Physical aspects of wear of the piston-ring—cylinder set of combustion engines

Abstract

The research presented in this paper has shown that the physical aspects of interfacial phenomena, described by the total value of surface free energy and the values of its components, make it possible to select more suitable materials for sliding pairs. The total value of surface free energy depends on the molecular structure and the bonds characteristic of a given material, and determines its hardness. In order to reduce friction losses in a sliding pair that is being designed, it is proposed to match such materials for the pair in such a way that the surface of one of them has a high sum of surface free energy components originating from van der Waals interactions, while the other material's surface has a possibly low value of the sum. Furthermore, proper values of the components of surface free energy ensure proper wettability with lubricating oil. In order to minimize friction in a sliding contact, the element with the larger surface area (e.g. a cylinder sleeve) should have larger dispersion and van der Waals forces compared with those of the oil, while the element with the smaller area (e.g. a piston ring) has to have smaller (as low as possible) dispersion and van der Waals forces compared with those of the lubricating oil. Thus a basis for reducing friction losses, particularly during mixed friction and boundary friction, has been created. Pursuing the practical goal of this research, a new cylinder liner sliding pair of a piston-ring—cylinder (PRC) set (in which the ring has a titanium nitride (TiN) coating and the cylinder liner has a surface layer with varying properties, applied by vacuum nitriding) of a piston packing ring—combustion engine was designed and made. The sliding pair can be used in self-ignition combustion engines and in spark-ignition engines. The sliding pair is the result of the research carried out as part of this paper, including tests in a tribotester and three-stage testing embracing numerical simulations, preliminary tests on the real object, and tests proper on the real object.

Keywords

surface energy wear coatings nitriding diesel engines piston-ring—cylinder set piston ring

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References

Adamson

A. W.

Physical chemistry of surfaces, 1960 (Interscience, New York).

Dereń

Haber

Pampuch

Chemistry of solid bodies (in Polish), 1977 (Panstwowe Wydawnictwo Naukowe, Warsaw).

Drzymala

Foundations of Mineral Processing (in Polish), 2001 (Wroclaw University of Technology Press, Wroclaw).

Dutkiewicz

E. T.

Physicochemistry of Surfaces (in Polish), 1998 (Wydawnictwa Naukowo-Techniczne, Warsaw).

Szarawara

Applied chemical thermodynamics (in Polish), 3rd edition, 1985, p. 58a (Wydawnictwa Naukowo-Techniczne, Warsaw).

Lyklema

Fundamentals of interface and colloid science, vol. 1, Fundamentals, 1993 (Academic Press, New York).

Benesch

Janowski

Mamro

Ferrous metallurgy, physicochemical foundations of processes (in Polish), 1979 (Wydawnictwo ‘Śask’, Katowice).

Allen

B. C.

Liquid metals, 1972 (Marcel Dekker, New York).

Good

R. J.

Intermolecular and interatomic forces. In Treatise of adhesion and adhesives, vol. 1(3) (Ed. Patrick

R. L.

), 1967 pp. 9–68 (Marcel Dekker, New York).

10.

Lennard-Jones

J. E.

On the determination of molecular fields, II. From the equation of state of a gas. Proc. R. Soc. A, 1924, 106, 463–477.

11.

Zakrzewski

Zawadzki

Strength of materials (in Polish), 1983 (Panstwowe Wydawnictwo Naukowe, Warsaw).

12.

Witek

Material harder than diamond (in Polish). Wiedza Zycie, 1994, 11.

13.

Enkiewicz

Adhesion and modification of surface layer of multimolecular materials (in Polish), 2000 (Wydawnictwa Naukowo-Techniczne, Warsaw).

14.

Fowkes

F. M.

Attractive forces at interfaces. Ind. Engng Chem., 1964, 56(12), 40–52.

15.

Drzymala

Adv. Colloid Interface Sci., 1994, 50, 143–185.

16.

Israelachvilli

Intermolecular and surface forces, 1985 (Academic Press, London).

17.

Jańczuk

Zdziennicka

Wójcik

Determination of surface free energy of solid bodies from wetting angle (in Polish). Wiadomości Chemiczne, 1995, 49(7–8), 429–347.

18.

Jańczuk

Zdziennicka

Wójcik

Surface free energy (in Polish). Wiadomości Chemiczne, 1995, 49(5–6), 301–324.

19.

Gutmann

Donor-acceptor approach to molecular interaction, 1979 (Plenum, New York).

20.

Fowkes

F. M.

McCarthy

D. C.

Mostafa

M. A.

J. Colloid Interface Sci., 1980, 78(1), 200–206.

21.

Kaźmierczak

Friction and wear of piston-ring-cylinder unit (in Polish), 2005 (Wroclaw University of Technology Press, Wroclaw).

22.

Kaźmierczak

Effect of cermetallic coating on tribological processes in ring seal of combustion engine (in Polish), 2002 (Wroclaw University of Technology Press, Wroclaw).

23.

23 Mechanical engineer's guide, 1985 (Wydawnictwa Naukowo-Techniczne, Warsaw).

24.

Burakowski

Wierzchoń

Metal surface engineering (in Polish), 1995 (Wydawnictwa Naukowo-Techniczne, Warsaw).

25.

Kaźmierczak

Computer simulation of piston- piston ring-cylinder liner coaction in combustion engine. Proc. Instn Mech. Engrs, Part D: J. Automobile Engineering, 2004, 218(12), 1491–1501.

26.

Przepiórka

Method of improving tribological characteristics of polyamide-steel friction joints (in Polish). PhD Dissertation, Radom Polytechnic, Radom, 2002.

27.

Rogowska

Osuch-Slomka

Surface free energy of titanium and carbon-titanium nitride PAPVD layer (in Polish). In Proceedings of the International Scientific Conference on Light industry, 2000, Radom, Poland, Scientific Works, no. 20/2001, pp. 348–355 (Radom Institute of Tera- technology, Radom).

28.

28 Operating manual: T-05 roller-block tester, 1993 (Department of Tribology, Institute for Terotechnology, Radom).

29.

29 NITROVAC technology, 1998 (Lodz University of Technology Press, Lodz).

30.

Walkowicz

Smolik

Miernik

Bujak

Comparative investigation of the wear behaviour of TiN monolayer coatings, Ti(C, N) multicomponent coating and TiC/Ti(C,N)/TiN multilayer coating deposited by the vacuum arc method. In Thin films (Eds Hecht

Richter

Hahn

), 1994 pp. 587–590 (Informationsgesselschaft Verlag, Oberrursel).

31.

Sitnik

The kinetics of wear (in Polish), 1998 (Panstwowe Wydawnictwo Naukowe, Warsaw).

32.

Kaźmierczak

Analysis of results of tests on piston ring parts with antiwear coating carried out on roller-block stand (in Polish). Tribologia ROK, 2002, 33(3), 887–894.

33.

Kaźmierczak

Investigation of titanium nitride coated piston rings (in Polish). Zagadnienia Eks- ploatacji Maszyn, 2002, 3(131), 29–40.

34.

Buran

Mader

H. Ch.

Morsbach

Couches pulverises au plasma pour segments de piston; Situation et possibilites d'emploi, 1997 (Goetze A.G., Burscheid).

35.

Kaźmierczak

Method of optimising the micro- geometry of chromium cylinder sleeves (in Polish), 1994 (Wroclaw University of Technology Press, Wroclaw).

36.

Kaźmierczak

Tribology in combustion engines (in Polish), 1996 (Wroclaw University of Technology Press, Wroclaw).

37.

Starosta

The influence of the surface layer on the durability of the oil surface layer (in Polish), 1982 (Institute of Machine Design and Operation, Wroclaw University of Technology, Wroclaw).