Extrusion die manufacture
AssigneeCorning Glass Works
InventorDonald C. Peters
Life of this patent
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Abstract
This invention relates to a method for forming a die for use in fabricating a ceramic honeycomb monolith structure having passages separated by walls having predetermined thicknesses. The method involves forming slots in the die and then applying a uniform coating of iron boride, chromium carbide, aluminum oxide, titanium carbide, titanium nitride or titanium carbonitride to the slot-defining surfaces of the die through CVD, the coating ranging in thickness up to 30 microns and being controlled in thickness to .+-.1 micron.
Claims6
A method for forming an extrusion die suitable for fabricating a ceramic honeycomb monolith structure having separated walls of predetermined thicknesses in parallel relationship to the longitudinal axis of said structure by forming slots in the die, and then applying a uniform coating selected from the group of iron boride, chromium carbide, aluminum oxide, titanium carbide, titanium nitride, and titanium carbonitride to the slot-defining surfaces of the die through chemical vapor deposition, that coating ranging in thickness up to about 30 microns and being controlled in thickness to .+-.1 micron.
An extrusion die suitable for fabricating a ceramic honeycomb monolith structure having separated walls of predetermined thicknesses in parallel relationship to the longitudinal axis of said structure, said die consisting essentially of steel, the slot-defining surfaces thereof having a uniform coating thereon ranging in thickness up to 30 microns and being controlled in thickness to .+-.1 micron selected from the group of iron boride, chromium carbide, aluminum oxide, titanium carbide, titanium nitride, and titanium carbonitride.
Dependencies are inferred from the claim text.