Abstract: A prechamber spark plug for an internal combustion engine with the following features: a body with an external thread at its front end for screwing the spark plug into the engine; the external thread has a center line and begins with a thread start at the front end; the body has a passage in which an insulator is fastened and a center electrode protrudes from the front end of this insulator; at the front end of the body, a prechamber-forming cap is provided, which delimits a prechamber and shields the center electrode from a combustion chamber of the engine after the spark plug has been installed in the engine; the cap has at least one opening, which has a predefined orientation in relation to the thread start and is oriented obliquely to the center line of the external thread so as to permit a gas exchange between the prechamber and the space outside the prechamber.

Abstract: A prechamber spark plug for a gas-powered internal combustion engine, having a metallic body, an insulator, a center electrode, at least one ground electrode, a cap, and a sleeve. The cap is arranged at a front end of the spark plug and shields the center and ground electrodes from a combustion chamber after the prechamber spark plug is installed in the internal combustion engine, and the cap delimits a prechamber in which the center electrode and the ground electrode are located from the combustion chamber. The cap has at least one opening that permits gas exchange between the prechamber and the space outside of the prechamber. The cap is mounted on the sleeve, which surrounds a section of the body, contains external threads for screwing into the internal combustion engine, and is joined to the body. In addition, a method for manufacturing the aforementioned spark plug is described.

Abstract: A method for manufacturing an ignition electrode for spark plugs for internal combustion engines and spark plug manufactured therewith. The method includes producing by powder metallurgy a green part or brown part containing the base metal or the base metal alloy, coating of a part of the surface of the green part or brown part with a mixture that contains the precious metal or the precious metal alloy in the form of a powder and a binder, removing the binder from the layer that was formed by the coating and that contains the precious metal or the precious metal alloy, and sintering the coated green part or brown part to form a composite part. The composite part can be welded as an end piece to the one end of the base-metal section of the ignition electrode.

Abstract: A spark plug having at least one center or ground electrode that includes a first base metal or a first base metal alloy and a precious metal or a precious metal alloy. The at least one electrode has a surface bordering a spark gap that is made of a composite material in which crystalline particles of the precious metal or precious metal alloy are mixed with the first base metal or the first base metal alloy, and a portion of the particles of the precious metal or precious metal alloy forms a portion of the surface that borders the spark gap.

Abstract: A method for manufacturing an ignition electrode for spark plugs for internal combustion engines and spark plug manufactured therewith. The method includes producing by powder metallurgy a green part or brown part containing the base metal or the base metal alloy, coating of a part of the surface of the green part or brown part with a mixture that contains the precious metal or the precious metal alloy in the form of a powder and a binder, removing the binder from the layer that was formed by the coating and that contains the precious metal or the precious metal alloy, and sintering the coated green part or brown part to form a composite part. The composite part can be welded as an end piece to the one end of the base-metal section of the ignition electrode.

Abstract: A method for manufacturing an ignition electrode for spark plugs for internal combustion engines. The method includes producing by powder metallurgy a green part or brown part containing the base metal or the base metal alloy, coating of a part of the surface of the green part or brown part with a mixture that contains the precious metal or the precious metal alloy in the form of a powder and a binder, removing the binder from the layer that was formed by the coating and that contains the precious metal or the precious metal alloy, and sintering the coated green part or brown part to form a composite part. The composite part is welded as an end piece to the one end of the base-metal section of the ignition electrode.

Abstract: A spark plug having at least one center or ground electrode that includes a first base metal or a first base metal alloy and a precious metal or a precious metal alloy. The at least one electrode has a surface bordering a spark gap that is made of a composite material in which crystalline particles of the precious metal or precious metal alloy are mixed with the first base metal or the first base metal alloy, and a portion of the particles of the precious metal or precious metal alloy forms a portion of the surface that borders the spark gap.

Abstract: A method for manufacturing an ignition electrode for spark plugs for internal combustion engines. The method includes producing by powder metallurgy a green part or brown part containing the base metal or the base metal alloy, coating of a part of the surface of the green part or brown part with a mixture that contains the precious metal or the precious metal alloy in the form of a powder and a binder, removing the binder from the layer that was formed by the coating and that contains the precious metal or the precious metal alloy, and sintering the coated green part or brown part to form a composite part. The composite part is welded as an end piece to the one end of the base-metal section of the ignition electrode.