Coated reinforcing fibers, composites and methods

Details Coated reinforcing fibers, composites and methods Coated reinforcing fibers, composites and methods

1992-08-05

1995-06-20

Nelson, Peter A.

Stock material or miscellaneous articles

All metal or with adjacent metals

Having metal particles

428549, 428552, 428565, 428567, 428568, 428569, 428608, 428366, 428367, 428378, 428379, 428380, 428381, 428389, B22F 300

Patent

active

054260000

ABSTRACT:
Fiber-reinforced titanium alloy and intermetallic matrix composites having improved stability and tensile strength properties at elevated temperatures. The base reinforced fibers are pre-coated with a tailorable tri-layer coating, such as Ti--TiN--Ti. Preferably the TiN layer is graded so as to have metal-rich outer surfaces, such as titanium-rich TiN, providing excellent bonding affinity for the base titanium layer, bonded to the surface of the fibers, such as silicon carbide, and for the outer titanium layer, bonded to the titanium aluminum matrix, and a compound core, such as stoichiometric TiN, providing a stable interfacial barrier against chemical reactions, whereby the tensile strength and resistance to cracking of the composite is preserved even at elevated temperatures of 900.degree. C. or higher.

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patent: 4847044 (1989-07-01), Ghosh
patent: 5030277 (1991-07-01), Eylon et al.
patent: 5227249 (1993-07-01), Lukco et al.
patent: 5238741 (1993-08-01), Knights et al.
patent: 5244748 (1993-09-01), Weeks, Jr. et al.

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