Combustion synthesis of boride and other composites

Details Combustion synthesis of boride and other composites Combustion synthesis of boride and other composites

1988-07-28

1989-11-07

Lechert, Jr., Stephen J.

Compositions: ceramic

Ceramic compositions

Carbide or oxycarbide containing

419 45, 419 63, 419 5, 501 93, 501 96, C04G 3552

Patent

active

048792624

ABSTRACT:
A self-sustaining combustion synthesis process for producing hard, tough, lightweight B.sub.4 C/TiB.sub.2 composites is based on the thermodynamic dependence of adiabatic temperature and product composition on the stoichiometry of the B.sub.4 C and TiB.sub.2 reactants. For lightweight products the composition must be relatively rich in the B.sub.4 C component. B.sub.4 C-rich composites are obtained by varying the initial temperature of the reactants. The product is hard, porous material whose toughness can be enhanced by filling the pores with aluminum or other metal phases using a liquid metal infiltration process. The process can be extended to the formation of other composites having a low exothermic component.

REFERENCES:
patent: 4289720 (1981-09-01), Yajima et al.
patent: 4606902 (1986-08-01), Ritter
patent: 4718941 (1988-01-01), Halverson et al.
patent: 4732556 (1988-03-01), Chiang et al.
patent: 4800065 (1989-01-01), Christodoulou et al.

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