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Oleynik, Alexandr
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document
Tribological Characteristics of Nitrided in Plasma Glow Discharge Samples Made from Titanium Alloy VT5 in Pairs with Different Materials
Abstract
<jats:p>One of the modern methods of improving operating characteristics of titanium and titanium-based alloys under conditions of friction and increased contact loads is the method of ion-plasma nitriding. The effect of nitriding of VT5 alloy (Al 4,5-6,7 %, V to 1,2 %, Mo to 0,8 % &minus; analogue 3.7115) in the plasma of a glow discharge excited in a hollow cathode on its tribological characteristics in pairs with different materials in T-1 fuel and under dry friction conditions has been studied. For research and tribological tests, samples of VT5 alloy were nitrided in the plasma of a glow discharge excited in a hollow cathode at a temperature of 975 &plusmn; 15&deg;C and a pressure of 58 &plusmn; 2 PA in a nitrogen-argon gas mixture with a nitrogen content of 78 %. Studies of samples of VT5 alloy after nitriding showed that the surface roughness Ra was in the range of 0.58-0.64, and the surface hardness HV5 was 525 &plusmn; 20 kgf/mm&sup2; at a base hardness of 325 &plusmn; 15 kgf/mm&sup2;. Tribological tests were performed on a friction machine 2070 SMT-1 according to the scheme "cube - roller". Tests under conditions of friction with oil were performed at a load of 200 N. The sliding speed during the tests was 1.3 m/s, the test time was 75 sec. The test under dry friction conditions was carried out at a load of 100 N and a sliding speed of 0.785 m/s, the test time was 30 minutes. Low wear ability in relation to the nitrided titanium alloy VT5 (&lt;2.4x10-4 mm3/s), as well as friction coefficients at the level of 0.08 to 0.12 in the order of their growth had bronze VB-23NTS (Pd 18&ndash;22 %, Ni 3&ndash;4 %, Zn 3&ndash;4 %, Sb 3&ndash;4 %, P 0.15&ndash;0.3) r.O10C2N3, VB-24 (Sb 4.7&ndash;6, 2 %, P 0.4&ndash;0.9), steel 1.3505, cast iron GGG80, cemented steel 20Cr3MoWV.</jats:p>