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Nanocomposite Materials Lubricants

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Nanocomposite Materials Lubricants

  1. 1. 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
  2. 2. Tec Star S.r.l. Viale Europa, 40 – 41011 Campogalliano (MO), Italy Tel. +39059 526845 – Fax +39059 527000 Summary Nanoadditives for tribological performance in lubricants  How they work  Dispersion and stability  liquid and grease nanocomposite lubricants: tribological properties: tribological properties Example of applications
  3. 3. 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
  4. 4. 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
  5. 5. 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
  6. 6. 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
  7. 7. 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 = DCG2 2. Others kinds of nanofiller increase the WR 3. Main problem = Nanoparticles dispersion and stability 4. DCG2 is more stable with respect to the other ones
  8. 8. 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%.
  9. 9. 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
  10. 10. 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.
  11. 11. 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.
  12. 12. 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 reduction 2. Reduction in the operating temperature of bearings during the test 3. 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.
  13. 13. 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
  14. 14. 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%
  15. 15. Tec Star S.r.l. Viale Europa, 40 – 41011 Campogalliano (MO), Italy Tel. +39059 526845 – Fax +39059 527000 Contacts Dr. Alberto Borghi borghi@tec-star.it TEC STAR Srl Viale Europa, 40 41011 Campogalliano (MO) - Italy Tel (+39)059.526845 Fax (+39)059.527000

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