The synergistic effect of copper powder with PTFE in a grease lubricant under mixed friction conditions

• Autorzy: Krawiec S.

Warianty tytułu

PL

Efekt synergetyczny proszku miedzi i PTFE w smarze plastycznym podczas tarcia mieszanego

• Języki publikacji: EN

Abstrakty

EN

This paper describes experimental work on the frictional performance of a lithium grease lubricant filled with a combination of polytetrafluoroethylene (PTFE) and copper powders. The tribological testing was carried out in agreement with the prescriptions of the Polish standard PN-76/C-04147 using a fourball apparatus. The performance of the tested compositions was evaluated using three criteria: ball wear d, limiting wear load G, and seizure load Fz. Synergy between action of the powders of PTFE and copper in compositions with 6 wt.% of these fillers was found. Examinations of the chemical composition of the upper layer of the wear scars of the tested balls were carried out using an X-ray microanalysis method with dispersion of the radiation energy. The results of these analyses made it possible to confirm the author's notion that the synergy of PTFE with copper in the lithium grease tested was possible due to the thermal decomposition of PTFE and the consequent creation of new layers during a reaction of the decomposition products with the platering layer of copper. These new layers are, to a high degree of probability, complexes with copper, sulphur, and fluorine.

PL

W artykule opisano badania efektywności smarowania smaru plastycznego litowego napełnionego kombinacją proszku PTFE i miedzi. Badania tribologiczne prowadzono na aparacie czterokulowym, z zastosowaniem wytycznych normy PN-76/C-04147. Efektywność badanych kompozycji oceniano według trzech wielkości kryterialnych, tj. zużycia kulek d, granicznego obciążenia zużycia Goz, oraz obciążenia zespawania Fz.. Stwierdzono efekt synergistyczny proszku PTFE i miedzi w kompozycjach zawierających po 6% wagowych tych napełniaczy. Przeprowadzono badania składu chemicznego warstw wierzchnich śladu zużycia kulek wykorzystując metodę mikroanalizy rentgenowskiej z dyspersją energii promieniowania. Wyniki tych analiz pozwoliły potwierdzić słuszność poglądu, że synergizm PTFE i miedzi w smarze (w procesie tarcia) zachodzi dzięki termicznemu rozpadowi PTFE i utworzeniu podczas reakcji produktów tego rozpadu z warstewką platerującą miedzi nowych warstewek będących najprawdopodobniej kompleksami zawierającymi miedź, siarkę i fluor.

Słowa kluczowe

EN

fillers; greases; synergism; mixed friction

PL

smarowanie; smar plastyczny; tribologia

• Wydawca: Springer ; Wrocław University of Science and Technology
• Czasopismo: Archives of Civil and Mechanical Engineering
• Rocznik: 2011
• Tom: Vol. 11, no 2
• Strony: 379--390
• Opis fizyczny: Bibliogr. 21 poz., tab., wykr.

Twórcy

autor

Krawiec S.

• Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland

Bibliografia

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