Ceramic articles made of compositions containing borides and nit

Details Ceramic articles made of compositions containing borides and nit Ceramic articles made of compositions containing borides and nit

1993-12-23

1995-04-25

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

501 98, 501103, 51307, C04B 3558

Patent

active

054098688

ABSTRACT:
A composition is described for hard sintered ceramic articles having densities which are 97% or higher than the theoretical density. The composition contains up to 98.5 vol. % titanium diboride, 0-59 vol % aluminum nitride, 0-59 vol. % hexagonal boron nitride, 0-59 vol. % zirconium nitride, and in addition, zirconia, hafnia or ceria having particle size 0.7 .mu.m or less, in 1.5 vol. % and optionally, a sintering aid in less 2 vol. %. The mixture of the above components is further mixed and ground by ball-milling and vibro-milling in the presence of an aliphatic alcohol, cast into required shapes and sintered in an inert gas at temperatures below 1950.degree. C. The sintered ceramic articles obtained of this composition include ceramic cutting tool inserts, impact-resistant ceramic structures, nozzles, extrusion dies and ceramic evaporating boats.

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patent: 4933308 (1990-06-01), Nishio et al.
patent: 5045512 (1991-09-01), Lange et al.
patent: 5185112 (1993-02-01), Saito et al.
patent: 5185300 (1993-02-01), Hoggard et al.
patent: 5200372 (1993-04-01), Kuroyama et al.

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