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214 Marian Teodor Popescu et al. 2. Experimental Device Atmospheric tribometer, equiped with a radiative oven (TFA). The tribometer used for tests was made by Adamou in the tribology laboratory of ENI Tarbes (Fig. 1). The contact configuration is pawn-disc type. Fig. 1– The test device and the samples and the pawn dimensions. During the test, the following parameters have been enlisted, with the contact pickoff help: the friction coefficient as a raport between the tangential force and the normal force, in ASCII or EXCEL format; the vertical movement of the samples, represented by the material wear; the friction coefficient evolution over time; the contact surface temperature (see Tables 1–3). The pawn having the plane friction surface is made from steal „Stub” X22CrNi17, hardness 247 HV30. Table 1 Functional Parameters Friction Slipping Configuration, type Plane, open method of contact Type of Uniaxial Conformity of In accordance with the movement rotation contact surface Ø Punch 6 mm Ø disc 37 mm Surface of contact 113 mm 2 Average pressure
Bul. Inst. Polit. Iaşi, t. LVIII (LXII), f. 4, 2012 215 Table 2 Demand conditions Charge (N) 15 Speed (m.s -1 ) 0.1…1.5 Temperature (°C) 80±5 Browsed distance (m) 19240 Number of performed rotations 1631.16 Theoretical duration (min-s) 35 … 2100 Table 3 Material parameters Punch (friction) Disc (sample) Materials Stub X22CrNi17 (AISI431) Stainless steel martensitic Elasticity Toughness H v=247 (H v(30)) Preparing the surfaces Grin<strong>din</strong>g SiC 240, 400, 1000, 2500, 4000 papers. First 4 papers with thin adhesive tape, the last paper with foamy adhesive tape SiC 600, 1200, 4000 papers. For 5 minutes, each paper. Speed 150 tr/min Charge 13 N Solution Ethanol Water Device TFA (tribometer) Grinder, Charge 13 N Cleaning Ethanol Ultrason Ethanol -5min Oven (60°C) State of surfaces before friction Before (nm) After (nm) Before (nm) After (nm) Arithmetic average rugosity (Ra) --- 4523 63 4323 Average square rugosity (Rq) --- 5566 82 5250 Skewness (Sk) --- -0.34 --- --- Kurtosis (Ek) --- 2.72 29.58 --- Due to the fact that the friction device was not dismounted after the preparation, we do not have images, nor values for the roughness before the test. The values Ra, Rq, Ssk, Sku are computed accor<strong>din</strong>g to the analysed surface. The values measured after the test for the sample are taken on the track. 3. Results Starting from the values enlisted by the couple contact pickoff (Nm) and knowing the medium radius of the friction track on the disc (r = 0.0135 m) and the normal force applied on the pawn, the evolution of the friction coefficient in time can be followed. The friction quotient was deducted from d’Amontons law (Fig. 2 and Table 4), with the state of the surface presented in Fig. 3.
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