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
Tec Star S.r.l.Viale Europa, 40 – 41011 Campogalliano (MO), Italy
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
Tec Star S.r.l.Viale Europa, 40 – 41011 Campogalliano (MO), Italy
Tel. +39059 526845 – Fax +39059 527000
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
Tec Star S.r.l.Viale Europa, 40 – 41011 Campogalliano (MO), Italy
Tel. +39059 526845 – Fax +39059 527000
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
Tec Star S.r.l.Viale Europa, 40 – 41011 Campogalliano (MO), Italy
Tel. +39059 526845 – Fax +39059 527000
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
Tec Star S.r.l.Viale Europa, 40 – 41011 Campogalliano (MO), Italy
Tel. +39059 526845 – Fax +39059 527000
Nanoadditives for tribological performance in lubricant: tribological properties
WR=V/(L·D)
DCG = dichalcogenide structure
Tec Star S.r.l.Viale Europa, 40 – 41011 Campogalliano (MO), Italy
Tel. +39059 526845 – Fax +39059 527000
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
Tec Star S.r.l.Viale Europa, 40 – 41011 Campogalliano (MO), Italy
Tel. +39059 526845 – Fax +39059 527000
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%.
Tec Star S.r.l.Viale Europa, 40 – 41011 Campogalliano (MO), Italy
Tel. +39059 526845 – Fax +39059 527000
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
Tec Star S.r.l.Viale Europa, 40 – 41011 Campogalliano (MO), Italy
Tel. +39059 526845 – Fax +39059 527000
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.
Tec Star S.r.l.Viale Europa, 40 – 41011 Campogalliano (MO), Italy
Tel. +39059 526845 – Fax +39059 527000
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.
Tec Star S.r.l.Viale Europa, 40 – 41011 Campogalliano (MO), Italy
Tel. +39059 526845 – Fax +39059 527000
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.
Tec Star S.r.l.Viale Europa, 40 – 41011 Campogalliano (MO), Italy
Tel. +39059 526845 – Fax +39059 527000
Nanoadditives for tribological performance in lubricant: example of applications
Worm gearbox
Yield and Temperature vs Synthetic Oil: normal and nanocomposite
Tec Star S.r.l.Viale Europa, 40 – 41011 Campogalliano (MO), Italy
Tel. +39059 526845 – Fax +39059 527000
Nanoadditives for tribological performance in lubricant: example of applications
WORK IN PROGRESS
Drawing Metal
We compare Chlorinated oil and Nanocomposite oil
Result: the speed of work increased by 15-20%
Tec Star S.r.l.Viale Europa, 40 – 41011 Campogalliano (MO), Italy
Tel. +39059 526845 – Fax +39059 527000
Contacts
Dr. Alberto [email protected]
TEC STAR SrlViale Europa, 40
41011 Campogalliano (MO) - ItalyTel (+39)059.526845 Fax (+39)059.527000
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