Synergistic Compositions of Colloidal Nanodiamond as Lubricant-additive
(Color online) Friction coefficients as a function of a load (a) and EP failure load (b) for the grease samples from the Table I obtained in the shaft/bushing test. Sample numbers according to the Table I notations are indicated near the curves (a). Figure 2. Friction coefficients for the samples 1-5 (Table I) with DND and PTFE additives obtained from the ring-on-ring test at different rotation speeds and a low load (320N).
(Color online) Friction coefficients for the samples 1–5 (Table I) with DND and PTFE additives obtained from the ring-on-ring test at different rotation speeds and a low load (320N).
(Color online) Coefficient of friction (a) and temperature (b) of mineral oil (I12A) composition with various amounts of nanodiamond and PTFE «A» obtained by ring-on-ring technique. Load is 120 N, rpm=1000.
(Color online) Photographs of colloidal suspension of 0.1% 10nm DND (10nm when dispersed in DI water) in PAO-6 oil (a) and suspension of 90nm DND decorated with Cu and Cu nanoparticles (1:2.4 ND:Cu ratio) in PAO-6 oil (ND@Cu sample) (b). Cu content is 0.05 wt%. Volumetric size distribution of DND shown in Fig. 4(a) in PAO-6 oil (c).
(Color online) Tribological characteristics of formulations of PAO-6 with 0.03% DND and 0.3% PTFE (Zonyl MP 1100) additives, except sample ‘oil+ND’ containing 0.05% DND (120nm).
Analysis of the friction surfaces will be pursed in the future work.
(Color online) Absorption spectra for suspensions in PAO-6 oil of Cu and DND (DND@Cu samples) at two different concentrations of DND, as well as for PTFE@Cu sample. Cu content in all samples is 0.05 wt%.
(Color online) Failure load, wear spot and average coefficient of friction for formulations of PAO-6(+) with different combinations of 0.05% DND (120 nm), 0.12% Cu and 0.5% PTFE (Zonyl MP 1100) additives.
Compositions of the greases using I40A as a base oil with DND (180–200 nm) and PTFE additives used for shaft/bushing and ring-on-ring tests.
Coefficient of friction and EP failure load of grease compositions with various amounts of DND and different types of PTFE at 4wt% loading (except 5.3% for sample 6) obtained by the shaft/bushing technique. Samples compositions are summarized in Table I. Failure loads for the base oil I40A and the oil with Li-based thickener are 126 kG and 138 kG, correspondingly.
Coefficient of friction (COF) of grease composition with various amounts of DND and different types of PTFE at 4 wt% loading obtained by ring/ring technique at different rotation speed. Load =320 N. COFs for the base oil I40A and the base oil with Li-based thickener are 0.14 and 0.15, correspondingly (at rotational speed 500 rpm).
Tribological characteristics of formulations of PAO-6 and PAO-6+ with DND, PTFE (Zonyl MP 1100), Vanlube additives as well as ND@Cu sample. Friction coefficient is averaged over test at 3 different rotation speeds (500, 1000 and 1500 rpm).
Tribological characteristics of formulations of PAO-6(+) with 0.05%DND (120 nm), 0.12% Cu and 0.5% PTFE (Zonyl MP 1100) additives used for ring-on-ring tests (Load is 320 N) and Four-ball test.
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