Patent ID: 6703117
Filing Date: 2004-03-09
Classification: B82Y,C04B,F16C,F16D,Y10T

Abstract:
A friction or sliding body, comprising:at least first and second composite materials reinforced with fiber bundles and containing a ceramics matrix, said first composite material acting as a friction layer and forming an outside with an outer surface, and said second composite material acting as a supporting body and being joined areally to said first composite material; said at least first and second composite materials having different fractions of fiber bundles, said fractions of fiber bundles being a reinforcing fiber bundle fraction and a matrix fiber bundle fraction with different mean fiber bundle lengths and an overall fiber bundle distribution with a minimum fiber bundle length of fiber bundles incorporated in said composite material, said minimum lying between said mean fiber bundle lengths of said reinforcing fiber bundle fraction and said matrix fiber bundle fraction; said fiber bundle lengths of said fiber bundles incorporated in said first composite material being shorter than said fiber bundle lengths of said fiber bundles incorporated in said second composite material; said fiber bundles of said first composite material having, on average, a distinct alignment perpendicular to said outer surface; said outer surface having regions of free carbon with a maximum diameter of 1.2 mm; said free carbon having a surface area with a total fraction being at most 35% of said outer surface; and said outer surface having a fine crack structure and substantially no stresses in the vicinity of said outer surface.