nanocomposite materials lubricants

Tec Star S.r.l.Viale Europa, 40 – 41011 Campogalliano (MO), Italy

Tel. +39059 526845 – Fax +39059 527000

Nanocomposite Materials: lubricants

Dr. Alberto Borghi

Tec Star Srl - President | CEO


Tel. +39059 526845 – Fax +39059 527000

Summary

Nanoadditives for tribologicalperformance in lubricants

How they work Dispersion and stability liquid and grease nanocomposite lubricants:

tribological properties: tribological properties

Example of applications


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BOUNDARY LUBRICATION regime is critical for wear and friction. To work in this condition, people add to lubricants chemical EP additives. Tipical additives are based on Chlorine, Sulfur, Phosphorus, Zinc, etc.

Main problems using these kind of chemical additives are due to chemical incompatibility, temperature effect, pollution.

Nanoadditives for tribological performance in lubricant: how they work


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Nanoadditives for tribological performance in lubricant: how they work

sheared transfer layers arranged on the surface for boundary layer lubrication

Nanoparticles as additives for lubricants are:

oxides and/or sulfides

spherical or onion like structure

functionalized or not

chemically inert

insensitive to temperature

small dimensions: allow them to easly enter

the contact area

low concentration


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Nanoadditives for tribological performance in lubricant: dispersion and stability

Uncoated DCG

S1-coated DCG

S2-coated DCG

S3-coated DCG

Average Agglomerate

size (µm2)1.7 1.1 0.6 0.35

Sedimentation time (days)

3 8 >14 4

Silane functionalization

S1 - Silane n°1 Long pol. chain

S2 - Silane n°2 Mid pol. chain

S3 - Silane n°3 Short pol. chain

DCG = dichalcogenide structure


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Nanoadditives for tribological performance in lubricant: tribological properties

WR=V/(L·D)

DCG = dichalcogenide structure


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Nanoadditives for tribological performance in lubricant: tribological properties of mineral oil

Tribological test: Wear Rate (WR) vs different kinds of nanoparticles:

• Room Temperature • Vertical Load = 500N• Rotational Speed = 200 rpm• Time = 30 min.• Block Material = 39NiCrMo5• Mineral Oil ISO 320 (M320)• Nanoparticles Concentration = 0.05 wt.%• Kind of Nanoparticles = variable

1. Best results = DCG22. Others kinds of nanofiller increase the WR 3. Main problem = Nanoparticles dispersion and stability4. DCG2 is more stable with respect to the other ones


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Nanoadditives for tribological performance in lubricant: tribological properties of mineral oil

Tribological test: WR vs Concentration of Nanoparticles (NPs) :

• Room Temperature• Vertical Load = 500N• Rotational Speed = 200 rpm• Time = 30 min.• Block Material = 39NiCrMo5• Mineral Oil ISO 320 (M320)• NPs concentration = variable• NPs = DCG2

WR doesn’t change with respect to the concentration of DCG2 NPs.

The decrease of WR in roughly 35%.


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Tribological test: WR vs NPs concentration:

• Room Temperature• Vertical Load = 700N• Rotational Speed = 870 rpm• Time = 30 min.• Block Material = CuSn12 • Synthetic Oil PAG ISO320 (P320)• NPs concentration = variable• NPs = DCG2

WR decrease vs concentration of NPs.

WR decrease = roughly 80%.

Nanoadditives for tribological performance in lubricant: tribological properties of synthetic oil


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Nanoadditives for tribological performance in lubricant: tribological properties of synthetic oil

Tribological test: WR vs Vertical Load:

• Romm Temperature• Vertical Load = variable

(low 470N, medium 700N, high 950N) • Rotational Speed = 870 rpm• Time = 30 min.• Block Material = CuSn12• Synthetic Oil PAG ISO320 (P320)• NPs concentration = 1 wt.%• NPs = DCG2

NPs decrease the WR with respect oil without NPs.


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Nanoadditives for tribological performance in lubricant: tribological properties of grease

Weld Load (WL) measures were performed with a four-ball apparatus, according to ASTM D 2596.The Weld Load is in kilograms and it represents the lowest applied load in kilograms force at which the rotating ball seizes and then welds to the three stationary balls.

The four-ball Wear Rate (WR) test (ASTM D2266) is run for 60 min at 1,200 rpm with a load of 40 kg.


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Nanoadditives for tribological performance in lubricant: example of applications

Bearing

Grease Nanoadditive has a positive impact on the bearing lubricity which led to:1. Bearing friction reduction2. Reduction in the operating temperature of bearings during the test3. Significant improvement of the bearing service time (in about 100%),4. Increasing of bearing dynamic load by about 30%.

Comparison of wear and tear of the inner bearing rings.Wear and tear of orbits is about the same even though the bearing lubricated with grease with the additive ran about a two fold number of hours.


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Worm gearbox

Yield and Temperature vs Synthetic Oil: normal and nanocomposite


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WORK IN PROGRESS

Drawing Metal

We compare Chlorinated oil and Nanocomposite oil

Result: the speed of work increased by 15-20%


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Contacts

Dr. Alberto [email protected]

TEC STAR SrlViale Europa, 40

41011 Campogalliano (MO) - ItalyTel (+39)059.526845 Fax (+39)059.527000

nanocomposite materials lubricants

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