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Synergistic Compositions of Colloidal Nanodiamond as Lubricant-additive
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10.1116/1.3478245
/content/avs/journal/jvstb/28/4/10.1116/1.3478245
http://aip.metastore.ingenta.com/content/avs/journal/jvstb/28/4/10.1116/1.3478245

Figures

Image of FIG. 1.
FIG. 1.

(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).

Image of FIG. 2.
FIG. 2.

(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).

Image of FIG. 3.
FIG. 3.

(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.

Image of FIG. 4.
FIG. 4.

(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).

Image of FIG. 5.
FIG. 5.

(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).

Image of Scheme 1.
Scheme 1.

Analysis of the friction surfaces will be pursed in the future work.

Image of FIG. 6.
FIG. 6.

(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%.

Image of FIG. 7.
FIG. 7.

(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.

Tables

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TABLE I.

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.

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TABLE II.

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.

Generic image for table
TABLE III.

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).

Generic image for table
TABLE IV.

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).

Generic image for table
TABLE V.

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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/content/avs/journal/jvstb/28/4/10.1116/1.3478245
2010-07-29
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Synergistic Compositions of Colloidal Nanodiamond as Lubricant-additive
http://aip.metastore.ingenta.com/content/avs/journal/jvstb/28/4/10.1116/1.3478245
10.1116/1.3478245
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