Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Metal and nonmetal in final product
Patent
1995-10-02
1998-01-13
Jordan, Charles T.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Metal and nonmetal in final product
419 45, B22F 100
Patent
active
057089566
ABSTRACT:
Ceramic-ceramic and ceramic-metal composite materials are disclosed which contain at least two ceramic phases and at least one metallic phase. At least one of these ceramic phases is a metal boride or mixture of metal borides and another of the ceramic phases is a metallic nitride, metallic carbide, or a mixture of metallic nitride and a metallic carbide. These composite materials may be made by a combustion synthesis process which includes the step of igniting a mixture of at least one element selected from titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, tungsten, aluminum and silicon, or a combination of two or more thereof, at least one boron compound selected from boron nitride, boron carbide, or a combination thereof and an ignition temperature reducing amount of a metal selected from iron, cobalt, nickel, copper, aluminum, silicon, palladium, platinum, silver, gold, ruthenium, rhodium, osmium, and iridium, or a mixture of two or more thereof, provided that at least one of the aforementioned elements is different from at least one of the aforementioned metals. This process permits a high degree of control over the microstructure of the product and relatively low pressures are required to obtain high composite material density. A densified product having high density and a finely grained microstructure may be obtained by applying mechanical pressure during combustion synthesis. The composites have improved hardness, toughness, strength, resistance to wear, and resistance to catastrophic failure.
REFERENCES:
patent: 4431448 (1984-02-01), Merzhanov et al.
patent: 4880600 (1989-11-01), Moskowitz et al.
patent: 4909842 (1990-03-01), Dunmead et al.
patent: 4946643 (1990-08-01), Dunmead et al.
patent: 5256368 (1993-10-01), Oden et al.
patent: 5364442 (1994-11-01), Sekhar
Dunmead et al., "Simultaneous Synthesis and Densification of TiC/Ni-Al
Johnson et al., "Preparation and Processing Platelet-Reinforced Ceramics .
Claar et al., "Microstructure and Properties of Platelet-Reinforced
Johnson et al., "Kinetics of Formation of a Platelet-Reinforced Ceramic Composite . . . ," J. Am. Ceram. Soc. 74 (9) 2093-2101 (1991).
Dunmead Stephen D.
Romanowski Michael J.
Chi Anthony R.
Jordan Charles T.
The Dow Chemical Company
LandOfFree
Single step synthesis and densification of ceramic-ceramic and c does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Single step synthesis and densification of ceramic-ceramic and c, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Single step synthesis and densification of ceramic-ceramic and c will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-335996