Method of producing coatings from hard high-melting point nitrides

Abstract

Abstract In a method of coating metallic or non-metallic surfaces with nitrides of metals of the fourth and fifth groups of the periodic system, a halide of the desired metal is caused to react with ammonia in the presence of the surface to be coated at a temperature above the decomposition temperature of the complex compounds formed between the halide and ammonia. The ammonia and the halide may be introduced separately into the reaction chamber, or the halide may be formed, as by passing hydrogen halide over the nitride of the nitride-forming metal, in the reaction chamber in a zone which has a lower temperature than the deposition zone and the ammonia introduced only into the deposition zone. The example describes the formation of a titanium nitride coating by reacting titanium tetrachloride with ammonia at a temperature above 650 DEG C. preferably 900 DEG -1200 DEG C., the titanium tetrachloride being introduced in a current of hydrogen. Reference has been directed by the comptroller to Specification 731,990.

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