Smart Lubrication™ 3 rd International Conference Lubricants Russia - 2007 Moscow 29nov07© 2007 Dow Corning, All rights reserved Solid Lubricants as Problem

Smart Lubrication™

3rd International Conference Lubricants Russia - 2007 Moscow 29nov07© 2007 Dow Corning, All rights reserved

Solid Lubricants as Problem Solver for

Industrial Applications

Dr. Manfred JungkDOW CORNING GMBH,

Rheingaustr. 34, D- 65201 Wiesbaden, GERMANY



Dow Corning• A global solution provider and

the leading technology pioneer in silicon-based material science.

• Shares equally owned by The Dow Chemical Company and Corning Incorporated, established in 1943

7,000: Products and services 25,000: Customers$4.39 billion: 2006 sales (USD)60: % of sales outside the U.S.9,100: # of employees worldwide1,000+: # of scientists and engineers4,600: Active patents worldwide6: % of annual sales revenue used for research



• We’re experts in lubrication, solving and preventing customer problems.

• For over 60 years customers worldwide have trusted our products and our people to help them work smarter, safer, and more successfully.

• A complete line of multi-purpose oils, synthetic and ultra-high-purity mineral-oil fluids, specialty compounds, greases, pastes, anti-friction coatings.

• Offer comprehensive set of services and solutions to compliment key lubrication needs.

• Backed by the innovative heritage of Dow Corning.

MOLYKOTE®



L = lubricating film thicknessR = sum of both surfaces’ roughness

Boundary FrictionL / R < 1

Fluid FrictionL / R > 5

Mixed Friction1 < L / R < 5

Contribution ofSolid Lubricant

Operating Regime of Solid Lubricants



Shockloads

Intermittent movement

Pressfitting

Avoidance of seizure

Severe Industrial Conditions



• Sulfides from Molybdenium, Zink, Tin, Lead, Tungsten, Antimony

• Phosphates from Calcium and others• Flourides from Calcium and others• Oxides from Zirconium and others• Graphite• Metal powders such as Copper, Tin,

Nickel, Brass and others• Thermoplastics such as

PolyEthylene, PolyTetraFlouroEthylene and others

Chemical substances used as Solid Lubricants



Lamellar structure of MoS2



Test machine:

block on ring

Synergistic effects of three solid lubricants



New generation: Polarized Graphite



Product Form: Powder

• Brake Pads– composition

• Fiber• Resin• Abrasive• Filler• Lubricant

– Advantage of Solid Lubricant

• Stabilization of friction coefficient, comfort

• Reduction of disk wear, judder• Noise reduction

• Molybdeniumdisulfide MoS2– Different average particle

size– Good adhesion to metal– Used when oil or coating is

not desirable– Burnishes with time/load

• Solid lubricant mixtures– Used for compounding

• Shims for tire molds• Carbon brushes• Designed plastics• Brake pads



Product Form: Dispersion

• High concentrated dispersion as oil additive– Industrial gear oils– 2-stroke motor cycle gear oils– Oils for Diesel engines without particulate filter system

• Ready to use dispersions– Specialized metal forming applications– With white solid lubricant packages to prevent fretting– For high temperature chain applications where

synthetic oil carrier evaporates



Product Form: Grease

• Usually contain around 3% of solid lubricant

• Advantage over chemically active EP-additives

• Examples:– Steel Industry– Constant Velocity

Joints– Ball Joints



Product Form: Paste

3 Types of Pastes• Thread Pastes

– Friction Coefficient around 0.1 (in most manuals) with low variation– Disassembly possible after long period of time– Ultra high temperature capability– Compatibility with high strength alloys- ultra pure for turbine applications

• Assembly Pastes– Prevention of fretting corrosion– Damage free disassembly, e.g. bearing from shaft– Low coefficient of friction– Corrosion protection

• Lubricating Pastes– Generally considered “Grease-Pastes”– Long term lubrication– Good adhesion– Corrosion protection– Temperature resistance



Product Form: Anti-friction Coating

Solid Lubricant is bonded to the surface – “lubricating paint”

• Composition– Resin system depends on desired cure method and media resistance– Carrier fluid are various Volatile Organics or water– Paint additives to enhance film forming properties– Solid lubricant packages for wear and friction reduction– Corrosion protective additives

• Application methods – depends on geometry of the to be coated part– Spraying– Printing– Dip-spin– Electro deposition

• Properties of applied film– Long lasting, wear resistant– No need for additional liquid lubrication in most cases– Corrosion protection– Reduction of stick slip– Reduction of friction as desired



Compressed overview on Solid Lubricants to master

Tribological challenges

Thank you very much for your kind attention !

Documents

Smart Lubrication™ 3 rd International Conference Lubricants Russia - 2007 Moscow 29nov07© 2007 Dow Corning, All rights reserved Solid Lubricants as Problem