Abstract: The inventive concept relates to a cobalt precursor, a method for manufacturing a cobalt-containing layer using the same, and a method for manufacturing a semiconductor device using the same. More particularly, the cobalt precursor of the inventive concept includes at least one compound selected from the group consisting of a compound of Formula 1 and a compound of Formula 2.

Abstract: The inventive concept relates to a cobalt precursor, a method for manufacturing a cobalt-containing layer using the same, and a method for manufacturing a semiconductor device using the same. More particularly, the cobalt precursor of the inventive concept includes at least one compound selected from the group consisting of a compound of Formula 1 and a compound of Formula 2.

Abstract: Provided is a piston ring capable of maintaining an excellent effect of preventing aluminum cohesion in a high output engine over a long period of time. At least one of the upper, lower, and side faces of the piston ring is coated with a silica-based coating in which hard nanoparticles are dispersed. The coating has a Martens hardness of 1,000 to 8,000 N/mm2. As the hard nanoparticles, carbon nanoparticles, nanodiamond particles, carbon nanotubes, or carbon nanofibers are used. To the coating, resin particles of a fluorine-based resin or a polyether-based resin may be added.

Abstract: A piston ring having a resin-based film covering at least one of the upper and lower sides, wherein the resin-based film contains a fibrous filler with a mean fiber diameter of 50 to 500 nm and an aspect ratio of 30 to 500, wherein the fibrous filler in the resin-based film to align roughly parallel to the film surface.

Abstract: Disclosed is a piston ring that, in an engine where high temperature is reached in the vicinity of the piston ring, is capable of sustaining an excellent effect of preventing aluminum cohesion over a prolonged period of time. The piston ring having a resin-based coating formed on at least one of an upper surface and a lower surface of a piston ring body, the resin-based coating including a first resin-based coating containing plate-like filler having a mean particle diameter of 2 ?m to 20 ?m and an aspect ratio of 20 to 200 and a second resin-based coating located under the first resin-based coating and containing hard particles having a mean particle diameter of 0.01 ?m to 1 ?m.

Abstract: Disclosed is a piston ring that, in an engine where high temperature is reached in the vicinity of the piston ring, is capable of sustaining an excellent effect of preventing aluminum cohesion over a prolonged period of time. The piston ring having a resin-based coating formed on at least one of an upper surface and a lower surface of a piston ring body, the resin-based coating including a first resin-based coating containing plate-like filler having a mean particle diameter of 2 ?m to 20 ?m and an aspect ratio of 20 to 200 and a second resin-based coating located under the first resin-based coating and containing hard particles having a mean particle diameter of 0.01 ?m to 1 ?m.

Abstract: [OBJECT] To provide a piston ring which, when used in a high-output engine, can sustain an excellent effect of suppressing aluminum adhesion, over a long period. [SOLUTION MEANS] Either or both the upper and lower sides of the piston ring are covered with a resin-based film containing a fibrous filler with a mean fiber diameter of 50 to 500 nm and an aspect ratio of 30 to 500. The fibrous filler content is 0.5 to 10 vol % with respect to the total resin-based film. Also, the fibrous filler used is at least one type from among carbon fibers, silica fibers and boron nitride fibers.

Abstract: Provided is a piston ring capable of maintaining an excellent effect of preventing aluminum cohesion in a high output engine over a long period of time. At least one of the upper, lower, and side faces of the piston ring is coated with a silica-based coating in which hard nanoparticles are dispersed. The coating has a Martens hardness of 1,000 to 8,000 N/mm2. As the hard nanoparticles, carbon nanoparticles, nanodiamond particles, carbon nanotubes, or carbon nanofibers are used. To the coating, resin particles of a fluorine-based resin or a polyether-based resin may be added.