Preparation and sintering of refractory metal borides, carbides

Details Preparation and sintering of refractory metal borides, carbides Preparation and sintering of refractory metal borides, carbides

1985-05-29

1987-09-15

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

501 93, 501 87, 264 65, 75238, 75244, 75249, C04B 3558

Patent

active

046939890

ABSTRACT:
The invention relates to the production of desirably consolidated high purity refractory metal borides, carbides, nitrides, or mixtures, combinations of cermets thereof. In the preparation, a second stage reaction is conducted at reduced pressure and sintering temperature. Furthermore, it is carried out in the presence of sintering aid which can be initially present as a particulate material and, as such, may be incorporated with other reaction ingredients. Sintering aid, in a dual role, may serve not only as an assistant in the second stage reaction, but also as a reaction participant. Moreover, during such rection at sintering conditions, the sintering assistance is obtained by means of sintering aid vapor. High purity products of desirable microstructure can be achieved, having densities on the order of 90 percent or more.

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