ASTM D7217 Standard Test Method for Determining Extreme Pressure Properties of Solid Bonded Films Using a High-Frequency, Linear-Oscillation (SRV) Test Machine
6. Apparatus
6.1 SRV Test Machine, illustrated in Figs. 1-4.
7. Reagents and Materials
7.1 Test Balls, 52100 steel, 60 HRC +/- 2 HRC, 0.025 µm +/- 0.005 µm Ra surface finish, Ø = 10 mm diameter.
NOTE 2 - The test can also be performed using rollers of antifriction bearings (Ø = 15 mm; length = 22 mm, parabolic border regions on each side of 3.5 mm). Using 2000 N as normal force possible in SRV III to SRV V models conducts only to a maximum initial Hertzian contact pressure of P0max = 808 MPa, which is far away from the capability of most SBFs. Alternatively, a smaller roller in Ø = 6 mm with length = 8 mm and 2 mm parabolic border regions on each side generates P0max = 2474 MPa.
7.2 Lower Test Disk, vacuum arc remelted (VAR) AISI 52100 steel with a inclusion rating using method D, Type A, as severity level number of 0.5 according to Test Methods E45, Specification A295/A295M, or a inclusion sum value K1 ≤ 10 according to DIN EN ISO 683-17 and spherodized annealed to obtain globular carbide, Rockwell hardness number of 60 HRC +/- 2 HRC, the surfaces of the disk being lapped and free of lapping raw materials. The topography of the disk will be determined by four values, 24 mm diameter by 7.85 mm thick:
0.5 µm < Rz (DIN) < 0.650 µm
0.035 µm < Ra (C.L.A.) < 0.050 µm
0.020 µm < Rpk < 0.035 µm
0.050 µm < Rvk < 0.075 µm
NOTE 3 - The DIN 17230-1980 was replaced by DIN EN ISO 683-17.
7.3 n-Heptane, reagent grade. (Warning - Flammable. Health hazard.)
7.4 Isopropanol, reagent grade. (Warning - Flammable. Health hazard.)
7.5 Toluene, reagent grade. (Warning - Flammable. Health hazard.)
7.6 Cleaning Solvent, a mixture of equal volumes of n-heptane, ispropanol, and toluene. (Warning - Flammable. Health hazard.)
