초록 ▼

A silicon diffusion coating is formed in the surface of a metal article by exposing the metal article to a reducing atmosphere followed by treatment in an atmosphere of 1 ppm to 100% by volume silane, balance hydrogen or hydrogen inert gas mixture. Hydrogen with a controlled dew point is utilized as

A silicon diffusion coating is formed in the surface of a metal article by exposing the metal article to a reducing atmosphere followed by treatment in an atmosphere of 1 ppm to 100% by volume silane, balance hydrogen or hydrogen inert gas mixture. Hydrogen with a controlled dew point is utilized as a surface preparation agent and diluent for the silane.

대표청구항 ▼

A method of forming a silicon diffusion coating on the surface of a metal said metal subject formation of a surface oxide that can be reduced by a furnace treatment under controlled atmosphere, the steps comprising: (a) pretreating said metal by heating said metal under conditions of, temperature le

A method of forming a silicon diffusion coating on the surface of a metal said metal subject formation of a surface oxide that can be reduced by a furnace treatment under controlled atmosphere, the steps comprising: (a) pretreating said metal by heating said metal under conditions of, temperature less than 1200°C. under a controlled atmosphere reducing to elemental constituents of said metal to reduce or prevent formation of a barrier coating on exposed surfaces of said metal; and (b) treating said metal under conditions where said metal article can be maintained at a temperature of less than 1000°C. under a controlled atmosphere consisting of silane at least 1 part per million by volume, balance hydrogen or hydrogen and inert gas mixture wherein said atmosphere contains silane to oxygen in a molar ratio greater than 2.5 and oxygen to hydrogen in a molar ratio less than 2×10-4 whereby silicon is diffused into the surface of said metal article.