5449421 Aluminum alloy composite material wiht intermetallic compound finely disperesed in matrix among reinforcing elements

APPLICATIONS

MANUFACTURE(FABRICATION)

5449421

5449529

ALUMINUM ALLOY COMPOSITE MATERIAL WITH INTERMETALLIC COMPOUND FINELY DISPERSED IN MATRIX AMONG REINFORCING ELEMENTS

METHOD FOR PRODUCING COMPOSITE MATERIAL MAINLY COMPOSED OF CARBON AND BORON Okada Osamu; Ogura Hiroaki; Sogabe Toshiaki Kagawa, JAPAN Assigned to Toyo Tanso Co Ltd

Hamajima Kaneo; Tanaka Atsuo; Dohnomoto Tadashi; Fuwa Yoshio; Michioka Hirohumi Toyota, JAPAN Assigned to Toyota Jidosha Kabushiki Kaisha In an aluminum alloy composite material including an aluminum alloy matrix and a reinforcing material such as fibers, whiskers or particles, intermetallic compounds made of Al and at least one selected from a group of Fe, Ni, Co, Cr, Cu, Mn,’MO, V, W, Ta, Nb, Ti and Zr are finely dispersed in the matrix existing among reinforcing material elements so as to maintain rigidity of the matrix alloy necessary to support the reinforcing material elements at high temperature. Optimum shapes and volumetric density of such intermetallic compounds are experimentally obtained.

There is provided according to the invention a method for producing a composite material mainly composed of a carbon and boron comprising the steps of impregnating a carbon material with a boron oxide and/or a hydrate compound thereof, and baking such carbon material under pressure by inert gas at a temperature of not lower than 1500 degrees C. A neutron absorbent and an oxidation resistant carbon material both including the composite material are also provided.

5451365 METHODS FOR DENSIFYING AND STRENGTHENING CERAMICCERAMIC COMPOSITES BY TRANSIENT PLASTIC PHASE PROCESSING

CERAMICMATRIXCOMPOSZTES

Barsoum Michel Lansdowne, PA, UNITED STATES Assigned to Drexel University

5443918 METAL FIBRE WITH OPTIMIZED GEOMETRY FOR REINFORCING CEMENT-BASED MATERIALS Banthia Nemkuma; Krishnadev Madhavarao CANADA Assigned to Universite Laval

Bumaby

,

A metal fiber for reinforcing cement-based materials comprises an elongated, substantially straight central portion and sinusoid shaped end portions. The sinusoid at each end portion has an optimum amplitude Ao, opt defined by: PS where kl=2.025*10-2, sigmaccompressive strength of the cement-based material in MPa, k2=3.19*10-10, epsilonf=ductility of the metal in percent, and beta= of the fiber in mm. The sinusoid further has a wavelength Ls defined by PS where Lf=length of the fiber, Lm=length of the central portion, and wherein 0.5 Lf
A ceramic composite may be densified, strengthened and toughened by the present transient plastic phase processing method. The ceramic composite comprises a transient plastic phase and a reactant phase. The transient plastic phase includes a metallic omponent and may also include a non-metallic component. The transient plastic phase has a yield strength which is a function of the stoichiometric concentration of the metallic component therein. In the present method, heat and pressure are applied to the ceramic composite to plastically deform the transient plastic phase and the reactant phase in the solid state at a reaction temperature lower than the melting temperature of either of the transient plastic phase or the reactant phase. A portion of the metallic component of the transient plastic phase is transferred to a reinforcing phase whereby a strengthened and toughened ceramic composite is formed comprising: (1) a matrix phase which has a higher yield strength and is more refractory than the transient plastic phase; and (2) a reinforcing phase in the matrix phase which is formed in situ from the reactant phase and the portion of the metallic component transferred from the transient plastic phase.

COMPOSITES

PART A Volume 27A Number 2 1996

161