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1. WO1997041368 - CERMET POUR COMPOSANTS DE FREINS ET SA FABRICATION

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. A brake component having at least 5 percent by volume of said brake component being a ceramic metal composite (CMC), the CMC having:

an interconnected crystalline ceramic phase and a noncontiguous metal phase dispersed within the interconnected ceramic phase,

a density of at most 6 g/cc,

a specific heat of at least 0.8 J/g°C, and

a flexure strength of at least 150 MPa at 900°C, wherein at least 45 percent by volume of the ceramic phase has a melting or decomposition temperature of at least 1400°C.

2. The brake component of Claim 1 , wherein the component is a brake friction element in which the CMC of said element contacts a second friction element upon braking and the CMC has a hardness of at least 1000 Kg/mm2 and an autogenous dynamic coefficient of friction of at least 0.4.

3. The brake component of Claim 1 or 2, wherein the ceramic phase is selected from the group consisting of: SiC; B4C; Si3N4; Al203; TiB2; SiB6; SiB4; AIN; ZrC; ZrB; a reaction product of at least two of said ceramics and a reaction product of at least one of said ceramics and the metal.

4. The brake component of Claim 1 or 2, wherein the metal phase is aluminum or an alloy thereof and the ceramic phase is comprised of at least two ceramics selected from the group consisting of:

(a) B4C,

(b) AIB2,

(c) AI4BC,

(d) AI3B48C2, (e) AIB12 and

(f) AIB24C4.

5. The brake component of Claim 1 or 2, wherein the metal phase is at least one metal selected from the group consisting of: aluminum; zirconium; titanium; copper; silicon; magnesium and alloys thereof.

6. The brake component of Claim 1 or 2, wherein the ceramic phase comprises between 85 to 98 volume percent of the CMC.

7. The brake component of Claim 1 or 2, wherein the metal phase is comprised of metal regions having an average equivalent diameter between 0.25 to 30 micrometers as determined by optical quantitative stereology.

8. The brake component of Claim 1 or 2, wherein the density of the CMC is at most 3 g/cc.

9. The brake component of Claim 1 or 2, wherein the CMC has a theoretical density which is at least 95 percent of theoretical.

10. The brake component of Claim 1 or 2, wherein the strength of the CMC is at least 200 MPa at 900°C.

11. The brake component of Claim 9, wherein the specific heat is at least 1 J/g°C at room temperature, the theoretical density is at least 98 percent of theoretical and the density is at most 3.0 g/cc.

12. The brake component of Claim 1 or 2 wherein the component is formed by bonding the CMC to a metal substrate.

13. A brake having at least one friction element which has at least 5 percent by volume of the element being comprised of a ceramic metal composite (CMC), the CMC contacting upon braking a second friction element and having:

an interconnected crystalline ceramic phase and a noncontiguous metal phase dispersed within the interconnected ceramic phase,

a density of at most 6 g/cc, a specific heat of at least 0.8 J/g°C,

an autogenous dynamic coefficient of friction of at least 0.4,

a hardness of at least 1000 Kg/mm2, and

a flexure strength of at least 150 MPa at 900°C

wherein at least 45% by volume of the ceramic phase has a melting or decomposition temperature of at least 1400°C.

14. The brake of Claim 13, wherein the brake is a train or plane brake.