Method for making a protective coating containing silicon carbide
First Claim
1. Method for providing a protective coating on a substrate, said method comprising:
- providing a substrate made of a material having a softening temperature which is above the melting temperature of silicon, said substrate having a surface;
covering said surface with a porous carbon coating consisting essentially of carbon, wherein said coating has an open porosity in a range between 40 and 95%;
applying a further coating layer consisting essentially of silicon directly on said porous carbon coating and over the substrate, wherein the ratio of the mass of the applied silicon to the mass of the carbon is selected from within a range of 2.35 to 49;
heating said substrate to a temperature above the melting point of silicon but below the boiling point of silicon, said heating being done under vacuum or in an inert atmosphere to thereby cause the silicon to melt and infiltrate the porous carbon coating and to bring said silicon to reaction with the carbon; and
cooling said substrate down to room temperature, wherein said substrate is thereby coated with a homogeneous protective layer consisting only of silicon carbide and free silicon with a thickness of the finished protective coating layer in the range of 0.2 mm to 2 mm.
1 Assignment
0 Petitions
Accused Products
Abstract
The present invention relates to a method for making a protective coating containing silicon carbide on at least a portion of the surface of a substrate made from a material with a softening temperature that is above the temperature applied to make the protective coating, where silicon is deposited on the portion of the surface of the substrate and where, under vacuum or in an inert atmosphere, the substrate is heated to a temperature above the melting point of silicon, and the silicon is brought to reaction with carbon that is contained in a porous coating. The surface of the object to be coated is initially provided with a porous carbon coating with an open porosity in a range between 40 and 95%, where said porous carbon coating is covered with a uniform coating of silicon, where the ratio in percent of mass (Ma-%) of the applied silicon to that of the carbon in the porous carbon coating is greater than 2.34, where the substrate is heated to a temperature that is above the melting temperature of the silicon, and that the substrate, provided with the coating that contains silicon carbide and free silicon, is cooled down to room temperature.
-
Citations
20 Claims
-
1. Method for providing a protective coating on a substrate, said method comprising:
-
providing a substrate made of a material having a softening temperature which is above the melting temperature of silicon, said substrate having a surface;
covering said surface with a porous carbon coating consisting essentially of carbon, wherein said coating has an open porosity in a range between 40 and 95%;
applying a further coating layer consisting essentially of silicon directly on said porous carbon coating and over the substrate, wherein the ratio of the mass of the applied silicon to the mass of the carbon is selected from within a range of 2.35 to 49;
heating said substrate to a temperature above the melting point of silicon but below the boiling point of silicon, said heating being done under vacuum or in an inert atmosphere to thereby cause the silicon to melt and infiltrate the porous carbon coating and to bring said silicon to reaction with the carbon; and
cooling said substrate down to room temperature, wherein said substrate is thereby coated with a homogeneous protective layer consisting only of silicon carbide and free silicon with a thickness of the finished protective coating layer in the range of 0.2 mm to 2 mm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
-
Specification
-
- Resources
-
Current AssigneeDeutsches Zentrum Fuer Luft-Un Raumfahrt E.V.
-
Original AssigneeDeutsches Zentrum Fuer Luft- Und Raumfahrt E.V.
-
InventorsHenke, Thilo, Krenkel, Walter
-
Primary Examiner(s)Meeks, Timothy
-
Assistant Examiner(s)Crockford, Kirsten A.
-
Application NumberUS09/354,681Publication NumberTime in Patent Office977 DaysField of Search427/228, 427/226, 427/202, 427/294, 427/333, 427/402, 427/397.7, 427/374.1, 427/337, 427/343, 427/344, 427/374.4, 427/376.2US Class Current427/343CPC Class CodesC04B 35/565 based on silicon carbideC04B 35/80 Fibres, filaments, whiskers...C04B 41/455 the coating or impregnating...C04B 41/5059 Silicon carbideC23C 26/00 Coating not provided for in...
