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Method and apparatus for forming aluminum-transition metal alloys having high strength at elevated temperatures
438
New Patents
consisting essentially of silicon nitride and having a dimension greater than and a density less than the finished product. The nitrided mixture is then hot pressed to produce a silicon nitride comprising object of desired dimension and density, which material is useful as a cutting tool material for machining metals.
4946807 COMPOSITE CERAMIC MATERIAL REINFORCED WITH SILICON CARBIDE WHISKERS
the base member; (c) a suspension tray for supporting a raw workpiece, the suspension tray being supported by the positioning frame; (d) a first pair of forming dies supported by the base member; (e) a press platen; (f) a second pair of forming dies moved by the press platen; (g) an actuator for moving the suspension tray whereby the suspension tray may be moved to a first position and to a second position between the pairs of forming dies; and (h) a cylinder for moving the press platen whereby the first pair of forming dies and the second pair of forming dies may be closed against the raw workpiece and the suspension tray. Other apparatus are also disclosed.
Akiyasu Okuno, Masakazu Watanabe, Kani, Japan assigned to NGK Spark Plug Co Ltd A composite ceramic material reinforced with silicon carbide whiskers consists essentially of 5 to 45% by weight of SiC whiskers, 3 to 20% by weight of at least one selected from the group consisting of oxides and oxynitrides of zirconium calculated on zirconium, and the balance being a SiZlON-based ceramic substance. The SiA1ON-based ceramic substance consists essentially of a substance selected from the group consisting of beta-SiA1ON represented by a compositional formula of Si6zAlzOzN8-z (where 0(z( or = 1) and an alpha, beta-composite SiAION made up of said betaSiAION and an alpha-SiAION of the formula Mx (Si,AI)12(O,N)16, where M denotes at least one selected from the group consisting of Li, Ca, Mg, Y and rare earth metals and 0(x( or = 2; and I to 25% by weight of a glass phase containing therein Zr, Si, AI, O and N, or further at least one selected from the group consisting of Y, Mg, Ca and rare earth metals. This composite material has high strength and toughness suitable for articles requiring high wear and heat resistance such as cutting tools or ceramic valves for internal combustion engines.
4948355 HOT/COLD PRESS FORMING APPARATUS FOR THERMOFORMABLE MATERIALS Frederick L Knollassignedto The Boeing Company One apparatus for forming a workpiece made of thermoformable material includes: (a) a base member; (b) a positioning frame supported by
4948558 METHOD AND APPARATUS FOR FORMING ALUMINUMTRANSITION METAL ALLOYS HAVING HIGH STRENGTH AT ELEVATED TEMPERATURES David J Skinner, Paul Chipko, Kenj Okazaki assigned to Allied-Signal Inc The invention provides an aluminum based alloy consisting essentially of the formula AlbalFeaXb, wherein X is at least one element selected from the group consisting of Zn, Co, Ni, Cr, M, V, Zr, Ti, Y, Si and Ce, a ranges from about 7-15 wt %, b ranges from about 1.5-10 wt % and the balance is aluminium. The alloy has a predominately microeutectic microstructure. The invention provides a method and apparatus for forming rapidly solidified metal within an ambient atmosphere, the rapidly solidified metal being an aluminum based alloy. Generally stated, the apparatus includes a moving casting surface which has a quenching region for solidifying molten metal thereon. A reservoir holds the molten metal and has orifice means for depositing a stream of the molten metal onto the casting surface quenching region. A heating mechanism heats the molten metal within the reservoir, and a gas source provides a nonreactive gas atmosphere at the quenching region to minimize oxidation of the deposited metal. A conditioning mechanism disrupts a moving gas boundary layer carried along by the moving casting surface to minimize disturbance of the molten metal on the casting surface at a quench rate of at least about 106 degrees C./sec.
New Patents
consisting essentially of silicon nitride and having a dimension greater than and a density less than the finished product. The nitrided mixture is then hot pressed to produce a silicon nitride comprising object of desired dimension and density, which material is useful as a cutting tool material for machining metals.
4946807 COMPOSITE CERAMIC MATERIAL REINFORCED WITH SILICON CARBIDE WHISKERS
the base member; (c) a suspension tray for supporting a raw workpiece, the suspension tray being supported by the positioning frame; (d) a first pair of forming dies supported by the base member; (e) a press platen; (f) a second pair of forming dies moved by the press platen; (g) an actuator for moving the suspension tray whereby the suspension tray may be moved to a first position and to a second position between the pairs of forming dies; and (h) a cylinder for moving the press platen whereby the first pair of forming dies and the second pair of forming dies may be closed against the raw workpiece and the suspension tray. Other apparatus are also disclosed.
Akiyasu Okuno, Masakazu Watanabe, Kani, Japan assigned to NGK Spark Plug Co Ltd A composite ceramic material reinforced with silicon carbide whiskers consists essentially of 5 to 45% by weight of SiC whiskers, 3 to 20% by weight of at least one selected from the group consisting of oxides and oxynitrides of zirconium calculated on zirconium, and the balance being a SiZlON-based ceramic substance. The SiA1ON-based ceramic substance consists essentially of a substance selected from the group consisting of beta-SiA1ON represented by a compositional formula of Si6zAlzOzN8-z (where 0(z( or = 1) and an alpha, beta-composite SiAION made up of said betaSiAION and an alpha-SiAION of the formula Mx (Si,AI)12(O,N)16, where M denotes at least one selected from the group consisting of Li, Ca, Mg, Y and rare earth metals and 0(x( or = 2; and I to 25% by weight of a glass phase containing therein Zr, Si, AI, O and N, or further at least one selected from the group consisting of Y, Mg, Ca and rare earth metals. This composite material has high strength and toughness suitable for articles requiring high wear and heat resistance such as cutting tools or ceramic valves for internal combustion engines.
4948355 HOT/COLD PRESS FORMING APPARATUS FOR THERMOFORMABLE MATERIALS Frederick L Knollassignedto The Boeing Company One apparatus for forming a workpiece made of thermoformable material includes: (a) a base member; (b) a positioning frame supported by
4948558 METHOD AND APPARATUS FOR FORMING ALUMINUMTRANSITION METAL ALLOYS HAVING HIGH STRENGTH AT ELEVATED TEMPERATURES David J Skinner, Paul Chipko, Kenj Okazaki assigned to Allied-Signal Inc The invention provides an aluminum based alloy consisting essentially of the formula AlbalFeaXb, wherein X is at least one element selected from the group consisting of Zn, Co, Ni, Cr, M, V, Zr, Ti, Y, Si and Ce, a ranges from about 7-15 wt %, b ranges from about 1.5-10 wt % and the balance is aluminium. The alloy has a predominately microeutectic microstructure. The invention provides a method and apparatus for forming rapidly solidified metal within an ambient atmosphere, the rapidly solidified metal being an aluminum based alloy. Generally stated, the apparatus includes a moving casting surface which has a quenching region for solidifying molten metal thereon. A reservoir holds the molten metal and has orifice means for depositing a stream of the molten metal onto the casting surface quenching region. A heating mechanism heats the molten metal within the reservoir, and a gas source provides a nonreactive gas atmosphere at the quenching region to minimize oxidation of the deposited metal. A conditioning mechanism disrupts a moving gas boundary layer carried along by the moving casting surface to minimize disturbance of the molten metal on the casting surface at a quench rate of at least about 106 degrees C./sec.