Abstract:
PROBLEM TO BE SOLVED: To provide a rare earth permanent magnet which allows the increase in coercive force in a Nd-Fe-B-based rare earth permanent magnet by making the post-sintering remaining nitrogen concentration 800 ppm or less in the rare earth permanent magnet, and to provide a method for manufacturing such a rare earth permanent magnet.SOLUTION: The method for manufacturing a Nd-Fe-B-based rare earth permanent magnet 1 such that the post-sintering remaining nitrogen concentration is 800 ppm or less, preferably 300 ppm or less comprises the steps of: grinding raw materials of the magnet into powder by means of dry grinding under an inert gas atmosphere; thereafter compacting and shaping the powder into a compact in the inert gas atmosphere; and then sintering the compact at a temperature of 800-1180°C.
Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing a welding material capable of overcoming all of six problems including a problem that cracking of an extrusion-molded product often occurs during a defatting step or a sintering step and a problem that the extrusion-molded product is disrupted readily.SOLUTION: The method for producing the welding material comprises, in the following order: a compound production step S2 of kneading alloy powder containing first alloy powder having a first average particle diameter and second alloy powder having a second average particle diameter, a water-soluble binder and water to produce a compound; a drying step S4; an extrusion step S6; a defatting step S8 of heating the extrusion-molded product to a predetermined temperature equal to or higher than 400°C; a C-O reaction step S10 of heating the extrusion-molded product to a predetermined temperature that ranges from 950°C-1150°C in a vacuum atmosphere; and a sintering step S12 of heating the extrusion-molded product to a predetermined temperature that ranges from 1200°C-1350°C in a nitrogen gas atmosphere to produce the welding material.
Abstract:
The present invention relates to a method for producing diamond-metal composites comprising mixing diamond particles with metal-filler particles forming a diamond/metal-filler mixture, forming a green body of the diamond/metal-filler mixture, optionally green machining the green body to a work piece before or after pre-sintering by heating the green body to a temperature ≦̸500° C., infiltrating the green body or the work piece with one or more wetting elements or infiltrating the green body or the work piece with one or more wetting alloys, which infiltration step being carried out under vacuum or in an inert gas atmosphere at a pressure ≦̸200 Bar. The invention relates further to a green body, a diamond metal composite, and use of the diamond metal composite.