Method for metallic coating of fibres by liquid technique
View Patent ↗The invention relates to a method for metallic coating of fibers by liquid technique, in which a fiber, coated with a material forming a diffusion barrier with the metal, is drawn through a liquid metal bath to be coated therewith. The method is characterized in that prior to the passage of the fiber into the bath, the fiber is coated with a compound wettable by the metal. The coating of the fiber by the metal is facilitated by the presence of the compound, forming an interface wettable by the metal.
1. A method for metallic coating of fibers by liquid technique, comprising:
coating the fiber with a barrier-forming material that creates a diffusion barrier with the metal;
coating the barrier-forming material with a first compound that is wettable by the metal;
coating the first compound with a second compound that is wettable by the metal, the second compound is tin; and
coating the second compound with the metal through a liquid metal bath,
wherein the metal is a titanium alloy.
2. The method according to claim 1 , wherein the fiber is a ceramic fiber.
3. The method according to claim 2 , wherein the fiber is a silicon carbide fiber, and the barrier-forming material is pyrocarbon or carbon.
4. The method according to claim 3 , wherein the first compound wettable by the metal is titanium carbide.
5. The method according to claim 4 , wherein the barrier-forming material is coated with titanium carbide by reactive chemical vapor deposition.
6. The method according to claim 5 , wherein the reactive chemical vapor deposition is applied using a titanium tetrachloride precursor in a hydrogen carrier gas.
7. The method according to claim 6 , wherein for the formation of a titanium carbide coating between 50 and 300 nm thick, the deposition is carried out with the following parameters:
the fiber temperature is between 1080 K and 1650 K;
the ratio of the hydrogen concentration to the titanium tetrachloride concentration is between 14.2 and 59.6 and
the fiber run speed is between 1 m/min and 3 m/min.
8. The method according to claim 3 , wherein the first compound wettable by the metal is titanium diboride.
9. The method according to claim 1 , wherein the first compound is coated by the second compound by liquid deposition.
10. The method according to claim 1 , wherein the metal coated fiber comprises four distinct layers.
11. A method for metallic coating of fibers by liquid technique, comprising:
coating the fiber with a barrier-forming material that creates a diffusion barrier with the metal, the barrier-forming material, the barrier-forming material selected from a group consisting of carbon and pyrocarbon;
coating the barrier-forming material with a first compound that is wettable by the metal, the first compound selected from a group consisting of titanium carbide and titanium diboride;
coating the first compound with a second compound that is wettable by the metal, the second compound is tin; and
coating the second compound with the metal through a liquid metal bath,
wherein the metal is a titanium alloy.