Compositions: ceramic – Ceramic compositions – Refractory
Patent
1990-05-25
1992-02-11
Dixon, Jr., William R.
Compositions: ceramic
Ceramic compositions
Refractory
423297, 423287, C04B 3558, C01B 3504, C01B 613, C01B 3500
Patent
active
050875922
ABSTRACT:
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 B.sub.2 O.sub.3 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.degree. 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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Alcan International Limited
Bonner C. Melissa
Dixon Jr. William R.
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