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1. WO2020113002 - MATÉRIAU À FRICTION DE GLISSEMENT AMÉLIORÉE

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

WHAT IS CLAIMED IS:

1. An article of manufacture comprising:

a body at least a portion of which is a multi-phase material (MPM) defining a traction surface;

said MPM comprising at least first and second zones comprising first and second

materials, Ml, M2, respectively, at or near said traction surface, said Ml and M2 having first and second Young moduli respectively, said first and second moduli differing by at least a factor of 3; and

wherein each of said second zones has a center, and wherein said second zones have a center-to-center radial distribution function having a peak at between 10pm and 10 mm.

2. The article of claim 2, wherein said peak is between 10pm and 1 mm.

3. The article of claim 1, wherein said first and second moduli differ by at least a factor of 4

4. The article of claim 3, wherein said first and second moduli differ by at least a factor of 10.

5. The article of claim 4, wherein said first and second moduli differ by a factor of 10 to 50.

6. The article of claim 1, wherein said first modulus is greater than said second modulus.

7. The article of claim 6, wherein said first modulus is about 1 kPa to about 100 MPa, and said second modulus is about 300 Pa to about 30 MPa.

8. The article of claim 1, wherein said at least first and second zones define alternating rows

9. The article of claim 11, wherein said alternating rows have essentially the same width.

10. The article of claim 9, wherein said width is about 10 mih to about 10 mm.

11. The article of claim 1, wherein said at least first and second zones comprise said second zones disposed as islands within a matrix of said Ml .

12. The article of claim 1, wherein said at least first and second zones are an

amalgamation of zones of said Ml and M2.

13. The article of claim 1, wherein said first and second zones comprise one or more additional zones comprising one or more different materials having Young’s moduli differing from said first and second moduli.

14. The article of claim 1, said traction surface comprises a thin layer over said Ml and M2.

15. The article of claim 14, wherein said thin layer comprises said M2, wherein said second modulus is less than said first modulus.

16. The article of claim 1, wherein x and y represent the fraction of surface area of said traction surface occupied by said Ml and M2, respectively, and wherein each of said MPM, Ml, and M2 has a sliding friction, fMPM, ii< ΐ2, wherein the sliding frictions correspond to an enhancement ratio Enh. R. = -
— , wherein Enh. R >1.

x*fMi +y*fM2

17. The article of claim 16, wherein Enh. R > 1.5

18. The article of claim 17, wherein Enh. R > 2.0

19. The article of claim 16, wherein x is greater than y.

20. The article of claim 16, wherein x about the same as y.

21 The article of claim 1, wherein said traction surface is planar.

22 The article of claim 1, wherein said article is a tire.

23. The article of claim 22, wherein said article also comprises one or more additional materials to enhance tire performance.

24. A method of preparing a multi-phase material (MPM) having a traction surface, said method comprising:

combining at least a first material Ml with a second material M2 to form at least first and second zones, respectively, at or near said traction surface, said Ml and M2 having first and second Young moduli respectively, said first and second moduli differing by at least a factor of 3; and

wherein each of said second zones has a center, and wherein said second zones have a center-to-center radial distribution function having a peak at between 1 pm and 10mm.

25. The method of claim 24, wherein said first modulus is lower than said second modulus, and wherein said combining comprises forming a structure comprising said Ml and defining cavities therein, and then filling said cavities with said M2.

26. The method of claim 25, wherein said forming said structure comprises molding said Ml with a mold.

27. The method of claim 24, wherein said combining comprises mixing crumbs of one of Ml or M2 into a fluid volume of the other of Ml or M2.

28. The method of claim 27, wherein said crumbs comprise M2 and said fluid volume comprises Ml.

29. A method of using a body having a traction surface in the elastohydrodynamic lubrication (EHL) regime, said method comprising:

sliding said traction surface of said body at a velocity on a wet surface under EHL conditions, said body comprising at least first and second zones comprising first and second materials, respectively, at or near said traction surface, said Ml and M2 having first and second Young moduli respectively, said first and second moduli differing by at least a factor of 3, and wherein each of said second zones has a center, and wherein said second zones have a center-to- center radial distribution function having a peak at between 1 p and 10 mm; and

wherein said EHL conditions comprise at least a normalized velocity V of greater than 10 8 , wherein V = UhRs/3G1/3N®/3 , and

wherein,

R is median asperity radius of said wet surface,

N is the normal load on said traction surface,

h is the viscosity of a lubricant on said wet surface,

U is said velocity, and

( is Gave = xGM1 + yGM2, wherein x and y represent the fraction of surface area of said traction surface occupied by said Ml and M2, respectively, and said GM1 and GM2 represent the first and second moduli, respectively.

30. The method of claim 29, wherein V is 10 8to 10 4 .

31. The method of claim 29, wherein said body is a tire and said wet surface is a wet road and said lubricant is water.

32. The method of claim 31, wherein said tire is mounted to a wheel of a vehicle.

33. The method of claim 32, wherein said sliding is caused by at least one of turning said wheel or braking said wheel.

34. The method of claim 29, wherein each of said MPM, Ml, and M2 has a sliding friction, fMPM, fMi- f] i2 wherein the sliding frictions correspond to an enhancement ratio wherein Enh. R >1.