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 mmin and 3 mmin.
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.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
Having thus described the invention, what is claimed is:
1. In an agricultural implement having a frame having a pair of tool-carrying wings pivotally mounted thereon for pivotal movement between raised transport positions and lowered ground-working positions; a hydraulic wing actuator connected to each said wing, said hydraulic wing actuator being extendable and retractable for effecting said pivotal motion, the improvement comprising:
a hydraulic wing actuator circuit connected to each of said wing actuators, which circuit, when connected to a tractor hydraulic system, enables said wing actuators to apply down pressure to said wings when the wings are in the lowered working positions, said circuit including a hydraulic pressure control valve means for controlling the down pressure exerted by said wing actuators.
2. The agricultural implement of claim 1 including a valve responsive to the position of said wing to disable the pressure relief valve associated with the wing actuators when the wings are raised upwardly beyond the working positions.
3. The agricultural implement of claim 1 wherein said wing actuator circuit includes a flow divider to allow the connection of another branch circuit to the same tractor hydraulic system to maintain constant flow to each branch regardless of varying pressure in either branch or between branches.
4. The agricultural implement of claim 1 wherein said hydraulic pressure control valve means comprises at least one pressure relief valve for controlling the down pressure exerted by said wing actuators.
5. An agricultural implement comprising:
a frame having a pair of tool-carrying wings pivotally mounted thereon for pivotal movement between raised transport positions and lowered ground-working positions, each said wing having a hydraulic wing actuator connected thereto which is extendable and retractable for effecting said pivotal motion;
a hydraulic wing actuator circuit connected to each of said wing actuators, which circuit, when connected to a tractor hydraulic system, enables said wing actuators to apply down pressure to said wings when the wings are in the lowered working positions;
hydraulic pressure control valve means for controlling the down pressure exerted by said wing actuators; and
a flow divider in said wing actuator circuit to allow the connection of another branch circuit to the same tractor control to maintain constant flow to each branch regardless of varying pressure in either branch or between branches.
6. The agricultural implement of claim 5 including a valve responsive to wing position to disable the pressure relief valve associated with the wing actuators when the wings are raised upwardly beyond the working positions.
7. The agricultural implement of claim 5 wherein said pressure control valve means comprises at least one relief valve.
8. An agricultural implement comprising:
a frame adapted to be connected to a prime mover;
a pair of tool-carrying wings pivotally mounted on said frame for pivotal movement between raised transport positions and lowered ground-working positions, each said wing having a hydraulic wing actuator connected thereto which is extendable and retractible for effecting said pivotal motion;
a hydraulic wing actuator circuit connected to each of said wing actuators, which circuit, when connected to a tractor hydraulic system, enables said wing actuators to apply down pressure to said wings when the wings are in the lowered working positions;
a hydraulic top link actuator secured to said implement frame and adapted to be interposed between said implement frame and said prime mover to apply down pressure to the implement frame; and
at least one pressure relief valve for controlling the down pressures exerted by said wing actuators and said top link actuator.
9. The agricultural implement of claim 8 wherein said hydraulic top link actuator is connected to said wing actuator circuit.
10. The agricultural implement of claim 9 wherein a pair of said relief valves are provided to enable the down pressures exerted by said wing actuators and top link actuator to be controlled separately.
11. The agricultural implement of claim 9 further comprising an implement lift hydraulic circuit adapted to be connected to a lifting system for raising and lowering the implement.
12. The agricultural implement of claim 11 including a valve to disable the down pressure action of the top link actuator when the implement lift circuit is activated to raise the implement.
13. The agricultural implement of claim 12 including a valve responsive to wing position to disable the pressure relief valve associated with the wing actuators when the wings are raised upwardly beyond the working positions.
14. The agricultural implement of claim 12 further comprising a flow divider in said wing actuator circuit to allow the connection of another branch circuit to the same tractor control to maintain constant flow to each branch regardless of varying pressure in either branch or between branches.