Method of producing platelets of borides of refractory metals

Details Method of producing platelets of borides of refractory metals Method of producing platelets of borides of refractory metals

C - Chemistry, Metallurgy

04

B

C04B 35/58 (2006.01) C01B 35/04 (2006.01)

Patent

CA 2082073

2082073 9118845 PCTABS00008 A method of producing platelets of refractory metal borides and the platelets so-produced. The method involves reacting an oxide of a refractory metal or a precursor thereof and B2O3 or a precursor thereof with carbon or a carbon precursor in the presence of a small amount of an alkali metal oxide, such as sodium oxide or potassium oxide, or a precursor. The reaction should take place under an atmosphere of an inert (non-reactive) gas. The alkali metal oxide allows the reaction temperature to be brought below 1800 ·C, which reduces impurities in the product, and affects the shape of the particulate boride product, resulting in the formation of platelets. The carbon used in the reaction is preferably derived from calcined anthracite coal or petroleum coke because such carbon sources permit the reaction to be carried out at lower temperatures. The platelets of the refractory metal borides so-produced can be used as reinforcements for ceramic or metal matrix composites or for other purposes.

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