| 摘要 |
Finely divided borides, carbides, and nitrides of metals of Groups III-VI of the Periodic Table, formed by reacting vaporous metal halide and a boron, carbon, or nitrogen source reactant at high temperatures, e.g., 1500 DEG C., are separated from gaseous reactor effluent stream at temperatures between about 200 DEG C. and 1500 DEG C. with the use of a porous sintered filter. By separating the finely divided product from the effluent stream before the stream cools to below about 200 DEG C., adsorption of impurities, e.g., unreacted metal halide or metal subhalides, on the product is reduced. The use of a filter, e.g., a porous sintered filter, avoids the size classification of product which may result when cyclones and a bag filter are used to collect product. |
