首页|Friction and wear characteristics of the nanolaminated ternary transition metal boride: Mn2AlB2
Friction and wear characteristics of the nanolaminated ternary transition metal boride: Mn2AlB2
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NSTL
Elsevier
Herein, the wear and friction behavior, under unlubricated sliding in ambient air, of the MAB phase Mn2AlB2 is reported. Various sliding pairs (WC, Al2O3, Si3N4, and chromium-bearing steel 100Cr6) were used in a ball-on-disc apparatus at a normal load of 10 N and a sliding velocity of 20 cm/s. Raman spectroscopy, scanning electron microscopy, and X-ray photoelectron spectroscopy were used to identify the wear mechanisms and tribo-oxidation products involved during the dry sliding contacts. Against WC, Al2O3, and Si3N4, the Mn2AlB2 exhibited wear by tribo-oxidation accompanied with delamination and abrasion, which led to high wear rates on the order of ～10-3 mm3/N · m and coefficients of friction of 0.72–0.87. However, Mn2AlB2/100Cr6 tribopair showed relatively mild wear behavior. The evolution of COF and wear rate for this tribopair, under different loads (5, 10, 15 N) and speeds (5, 25, 50 cm/s), showed the existence of load and speed thresholds (15 N at 25 cm/s and 10 N at 50 cm/s), beyond which an abrupt transition from mild to severe wear of Mn2AlB2 takes place. Below the thresholds, the Mn2AlB2 surfaces remain undamaged with the formation of a protective transfer layer, composed of a mixture of iron and manganese oxides. Above the thresholds, both friction and wear increase, and the Mn2AlB2 wears by microfracture and grain pullout.
FrictionMAB phasesMn2AlB2TribologyWear
Benamor A.、Hadji Y.、Chiker N.、Haddad A.、Sahraoui T.、Hadji M.、Kota S.、Liu L.、Ying G.
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Laboratoire d'Etudes et Recherche en Technologie Industrielle (LERTI)
Department of Materials Science and Engineering Drexel University
Department of Materials Science and Engineering College of Mechanics and Materials Hohai University
NSTL
Elsevier
