Nguyen Huynh

Don State Technical University

Nguyen Van Ngon

South Russian State Technical University (Novocherkassk Polytechnic Institute)

Nanopowders and their effectiveness while adding to a lubricating liquid

Previous work [1] shows that the improvement of tribological properties of lubricants is related to the formation of nanoscale films on the rubbing surfaces of metals.

Firstly, a number of ductile nanoscale metals (Cu, Sn, Pb, Ag) and their influence on the tribological properties of lubricants are investigated systematically. Structure and properties of the chelated compounds were proved by elemental analysis, IR spectroscopy and X-ray analysis. Nanoparticles of these ductile metals were obtained by the methods of electrochemical technology [2]. In this paper [3] nanoparticles of ductile metals, such as Pb (50-100 nm), Cu (300 nm); Sn (30-50 nm); Ag (30-70 nm) are obtained. Moreover, a pattern of the size distribution of the solution is also obtained by using the centrifuge “CPS Disc Centrifuge”.

Tribological tests were carried out in suspension, based on vaseline oil on a four-ball friction machine according to GOST 9490-75 and Tribotester T-11 by the standard method. The lubricating properties of the two "package" of compositions of the three metals (The 1st "package": a pure vaseline oil + Cu 4,5. 10 mol / l + Sn 0,45. 10 mol / l + Ag 0,05. 10 mol / l, the 2sd "package": a pure vaseline oil + Cu 4,5. 10 mol / l + Pb 0,45. 10 mol / l + Ag 0,05. 10 mol/l) is compared with pure vaseline oil.

Testing on two machines shows that the introduction of a "package" of nanoparticles has a positive effect on two of the "package". Among these packages, the worst effect was observed in the 2^nd one, respectively. This probably dues to the size of nanoparticles as well as the nature of metals.

Previous works [1, 2] show that the size of metal powders, which lie in additives, affect significantly their lubricating property. The smaller size of particle, the better lubricity of additives is.

In this paper we developed a technology for electrochemical nanoscale metals by restoring the metal ions on the friction surface, which allows to obtain nanoscale metal powders, and use them to improve the tribological characteristics of friction units.

In this work, we also proved the tribological efficiency of nanoscale powders, tin, copper, lead, silver in the liquid metal cladding lubricants. It is shown that friction on the friction surface forms ‘‘servo-witte’’ film, which improves the antifriction characteristics to about 20-30% and reduces the wear of contacting surfaces to about 10-16% in comparison with Vaseline. The positive effects observed while adding complex additives in Vaseline oil is assumed to associated with the formation of additional coordination that occurs at the friction surfaces in frictional contact.

List of used literature

1. A.S. Kuzharov. Coordination tribochemical selective transfer. Diss. Doctor. Tech. Sciences. - Rostov-on-Don, 1991. - 513 pp.

2. Kosogova. Nanoelectrochemical technology for realization of the effect no wear in water-alcohol media. Diss. Candidate. those. Sciences. - Rostov-on-Don. 2009. 165 pp.

3. Nguyen Huynh. The study of physical - chemical and tribological properties of lubricating metal cladding nanomaterials autochemistry today's market. The degree project-Rostov-on-Don, 2012.120 pp.