C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/11, 31/115
C01B 35/04 (2006.01)
Patent
CA 1075877
Abstract of the Disclosure Sub-micron titanium diaboride powder and other hard, refractory metal boride powders, such as zirconium diboride and hafnium diboride powders, are prepared by vapor phase reaction of the corresponding metal halide, e.g., titanium halide, and coron source reactante in the presence of hydrogen in a reaction zone and in the substantial absence of oxygen, either combined or elemental. In a preferred embodiment, the metal halide, e.g., titanium tetrachioride, and boron source, e.g., boron trichloride, reactants are mixed with a hot stream of hydrogen produced by heating hydrogen in a plasms heater. The reaction zone is mainitained at metal boride forming temperature and submicron soild metal boride powder is removed promptly from the reactor and permitted to cool. The preponderant number of metal boride particles comprising the powder product have a particle size in the range of between 00.5 and 0.07 microns. By adding a source of carbon in the reaction zone, a metal boride powder product is prepared containing a minor concentration of carbon, e.g., from above 0.1 about 5 percent by weight total carbon, probably as submicron refactory metal carbide. Alternatively, submicron metal carbide powders, e.g., titanium, zirconium, halnium or bores carbide powders, or finely-divided carbon can be blended physically with the sub- micron metal boride powder to provided metal borides containing a minor concentration of carbon in the amounts previouly indicated. Titanium diboride powder compositions containing minor amounts of carbon can be hot pressed, or cold pressed and sintered to densities of at least 95 percent of theoretical.
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