Abstract: A method for diffusion coating workpieces of ferrous base metals such as carbon steel and cast iron includes the step of weighing and mixing the following components, in powdered form: Chromium 40-50 wt % Ferrochromium 25-37 wt % Tantalum Carbide 0.40-0.65 wt % Vanadium 0.35-0.70 wt % Ammonium Halide 4-5 wt % Aluminum Oxide Remainder The workpieces are preferably degreased and then placed in a container with the mixed components. The container is sealed and heated to a temperature of 1000°-1050° C. The workpieces and the composition are kept at that temperature for a predetermined period, on the order of forty-five minutes or longer, to permit a surface layer of desired thickness to form. The container is then cooled in a conventional cooling chamber and the workpieces are removed. The method produces coatings having good wear and corrosion resistance.

Abstract: The present invention provides a composition and method for use in diffusion coating ceramic workpieces. In an especially preferred form, the composition comprises:Chromium 45-50 wt %Silicon Carbide 3.5-5.0 wt %Vanadium Boride 0.5-1.5 wt %Ammonium Halide 5.0-6.0 wt %Aluminum Oxide Remainder,the sum of all the components being 100 wt %. The components, in powdered form, are weighed and mixed in a container. The workpieces are placed in the container. The container is hermetically sealed and heated to a temperature of approximately 1000.degree. C. The workpieces and the composition are kept at approximately 1000.degree. C. for a predetermined period of time sufficient to permit a surface layer of desired thickness to form. The container is then cooled in a conventional cooling chamber down to approximately 300.degree.-350.degree. C. and air cooled to room temperature. The container is opened and the workpieces are removed.

Abstract: A composition for diffusion coating ferrous metals containing a particulate mixture of titanium in an amount of from 51.5 to 64.0% by weight, chromium in an amount of 17.5 to 24.0% by weight, alumina in an amount of from 15.0 to 21.25% by weight, ammonium halide in an amount of 1.5 to 2.0% by weight, molybdenum in an amount of 0.75 to 1.5% by weight and boron in an amount of 1.0 to 2.0% by weight.