METHOD OF PRODUCING REFRACTORY CARBIDES,BORIDES,SILICIDES,SULFIDES,AND NITRIDES OF METALS OF GROUPS IV,V,AND VI OF THE PERIODIC SYSTEM

摘要

1321084 High melting compounds of IVth, Vth and Vlth group metals; igniting compositions FILIAL INSTITUTA KHIMICHESKOI FIZIKI AKADEMII NAUKSSSR 15 April 1979 17847/70 Headings C1A and C1D [Also in Division C5] A method of producing a high melting-point inorganic compound comprises reacting a metal of group IV or V or VI of the Periodic Table with a non-metal selected from N, C, B, Si, O, P, S, F and Cl by applying heat directly to the reactants to initiate exothermic reaction therebetween, and permitting the reaction to proceed progressively throughout the mass of reactants wherein (a) the solid reactant or reactants is in the form of a compressed mass of particulate material, (b) for preparing a nitride, fluoride, chloride or oxide of one of said metals the metal is mixed with an additive selected from the following in the following amounts (in % by wt. of the starting material), from 0À5 to 50 of the desired final product, 0À5 to 10 of ammonium chloride and 0À5 to 10 of zinc chloride or (c) in the preparation of zirconium nitride the zirconium metal is reacted with nitrogen in thermal contact with liquid nitrogen, and in which the preparation of a carbide, boride, silicide, phosphide or sulphide is carried out under an inert gas. An igniting composition for initiating the exothermic reaction comprises CaSi 2 , Fe 2 O 3 , Mg, Al 2 O 3 , Ti and B and the reaction is initiated by contacting the reactants with said igniting composition which composition is then ignited by means of an electrical resistance heating coil.