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By S. Feigelstock

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Lambda ratios for preliminary tests at 20°C, 50°C and 100°C are given in Table 1. Table 1. 02m/s Temp. 6%Cr, 1%C) as the plate material and Cast Iron BS1452 as the pin material. The microhardness of the plate is 220HV while for the pin the microhardness is 185HV. Pin geometry was cylinder with circled end so the contact was point contact. 2~tm. 1%P level. These are referred to as 'no AW' oil and 'ZDDP' oil respectively. The viscosities of the lubricants are shown in Table 2. Table 2. 013 Before each test the samples were degreased with acetone, to remove any impurities from the surface.

360 . 420 . 480 540 600 time (rain) Figure 2. Friction coefficient using no AW oil at 20°C, 50°C and 100°C It can be seen from these data that for the no AW oil the friction maintains a steady value for the 8 hours test at 20°C with a small drop on friction at the end of the test while at 50°C and 100°C it rises slightly. However, in the presence of ZDDP at 50°C and 100°C the friction coefficient rises after an initial drop in the first 60 minutes of the test, while the initial drop and subsequent rise of friction coefficient at 20°C is much smaller.

Martin a, T. Le Mogne a, B. Vacher a, B. Constans b and S. Iovine b a Ecole Centrale de Lyon, UMR 5513, F-69134 Ecully (France) b TOTALFINAELF, Centre de recherche de Solaize, BP 22, 69360 Solaize (France) In this work, we have evidenced the formation of a lamellar solid from the tribochemical reaction of a borated additive and a succinimide additive. The result is the formation of h-BN in the tribofilm. The tribofilm is mainly composed of an amorphous borate matrix containing highly-dispersed h-BN nanoparticles in the form of sheets less than 10 nm wide and 5 nm thick.

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