Nanocomposite Materials Lubricants

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Transcript of 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

  • 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 (m2)1.7 1.1 0.6 0.35

    Sedimentation time (days)

    3 8 >14 4

    Silane functionalization

    S1 - Silane n1 Long pol. chain

    S2 - Silane n2 Mid pol. chain

    S3 - Silane n3 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/(LD)

    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 doesnt 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 Borghiborghi@tec-star.it

    TEC STAR SrlViale Europa, 40

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