C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/11, 261/24
C01B 35/04 (2006.01)
Patent
CA 1203967
Abstract Powder of essentially diboride of Group 4b metal with particle size substantially less than 5 µm is made by: (a) preparing a solution consisting essentially of Group 4b metal salt, soluble boron source and soluble carbon source in proportions for carbothermal reduction of the corresponding oxides of the metal and boron with carbon, (b) heating the solution to yield a dried and decomposed residue consisting essentially of very fine and intimate mixture of carbon and the oxides of the metal and boron, and (c) firing the residue up to and at temperature and for time to effect the carbothermal reaction of the residue to yield friable agglomerates primarily of the diboride which are very easily comminuted into powder of particles substantially less than 5 um size. Group 4b metal salt is replaced in part by salt of Group 5b, Group 6b and/or rare earth metal in order to yield corresponding boride of latter metal as sintering aid with Group 4b metal diboride in powder, especially as diboride solid solution. Latter complex diboride powder is suitable without hot pressing to close to theoretical density. The proportions of salt or salts, soluble boron source and soluble carbon source may be selected in additionally provide a minor boron carbon phase as sintering aid.
439029
Corning Glass Works
Gowling Lafleur Henderson Llp
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