B4C/Al cermets and method for making same

Details B4C/Al cermets and method for making same B4C/Al cermets and method for making same

1989-09-14

1991-08-13

Lechert, Jr., Stephen J.

Compositions: ceramic

Ceramic compositions

Carbide or oxycarbide containing

75244, 75238, 419 12, 419 16, 419 17, 419 27, 4285395, 501 87, 501 96, C22C 2904

Patent

active

050396331

ABSTRACT:
Reactive ceramic-metal compositions are described that include a ceramic phase of at least 70 percent by volume, 95 percent of theoretical density and a metal phase that retains its chemical reactivity with the ceramic phase after the composition has been fully densified. The composition may be heat treated after densification to form additional ceramic phases in a controllable manner. Preferred ceramic metal compositions wherein the metal and ceramic components retain reactivity after densification include boron carbide ceramic and Al or Mg metals. The process employed in forming said compositions requires first forming a sintered porous body of the ceramic material followed by contacting with the metal component, which may be in chip or solid bar form. The system is then heated to the melting point of the metal and a pressure of at least 200 MPa is employed such that the porous body is filled with metal and the composition is substantially fully densified. Subsequent heating reacts the metal with the ceramic to form additional B-C-metal phases as desired.

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