Patent ID: 7244376
Filing Date: 2007-07-17
Classification: C01P,C09C,Y10T

Abstract:
1. Hexaboride particles comprising particles of a hexaboride of at least one element (X) selected from Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Sr and Ca; wherein the surfaces of said hexaboride particles have physically been coated with a surface treatment agent containing silicon, the surface treatment agent being selected from a treatment agent of silazanes, a treatment agent of chlorosilanes, an inorganic treatment agent having at least one alkoxyl group in the molecular structure, and an organic treatment agent having at least one alkoxyl group at a molecular terminal or in the side chain, or have been coated with the surface treatment agent, the surface treatment agent having chemically combined with hexaboride particles on the surfaces of the hexaboride particles; said hexaboride particles are obtained by mixing, with stirring, hexaboride particles having not been coated with the surface treatment agent, the surface treatment agent and a solvent, subjecting the resultant mixture to dispersion treatment to obtain a fluid dispersion, and removing the solvent from the fluid dispersion by evaporation, followed by heating and drying at a temperature of 600° C. or less in the air or at a temperature of 1,000° C. or less in an inert-gas atmosphere and thereafter pulverization.