초록 ▼

An improved metal matrix composite which, in a preferred embodiment disclosed herein, utilizes boron carbide as the ceramic additive to a base material metal. The metal matrix composite of the present invention begins with the preparation of the boron carbide powder by particle size selection in a j

An improved metal matrix composite which, in a preferred embodiment disclosed herein, utilizes boron carbide as the ceramic additive to a base material metal. The metal matrix composite of the present invention begins with the preparation of the boron carbide powder by particle size selection in a jet mill. The resulting powder and metal powder are then mixed by blending of powder of all the various elements such as by means of a conventional blender to uniformly mix powdered substances and avoid stratification and settling. After the particles have been sufficiently mixed, they are degassed and then placed into a die and then into a cylindrical container where the particulates are subjected to extremely high pressures transforming the elements into a solid ingot. It is from these ingots that the extrusion tubes or other articles of manufacture may then be made.

대표청구항 ▼

A method of fabricating a metal matrix composite comprising the following steps: a) blending powders of a bore material metal, boron carbide and at least one metal additive having an inter-metallic phase temperature below the melting point of said base material metal; wherein said boron carbide cons

A method of fabricating a metal matrix composite comprising the following steps: a) blending powders of a bore material metal, boron carbide and at least one metal additive having an inter-metallic phase temperature below the melting point of said base material metal; wherein said boron carbide constitutes about 10% to 16% of the powders by weight and said additive constitutes less than about 1.5% of said powders; b) degassing said blended powders; c) isopressing said blended powders at a pressure of at least 65,000 psi; d) heating said isopressed powders up to at least 625 degrees Centigrade over a selected period of time; e) configuring said isopressed and sintered powders to the desired shape; and f) heat treating the resulting shape of step e).