C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
C04B 35/58 (2006.01)
Patent
CA 2137399
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 µm 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°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.
Bhola Rakesh
Dasgupta Sankar
Jacobs James K.
Bhola Rakesh
Dasgupta Sankar
Jacobs James K.
Na
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