Abstract:
Provided are a powder for a magnet, which provides a rare-earth magnet having excellent magnet properties and which has excellent formability, a method for producing the powder for a magnet, a powder compact, a rare-earth-iron-based alloy material, and a rare-earth-iron-nitrogen-based alloy material which are used as materials for the magnet, and methods for producing the powder compact and these alloy materials. Magnetic particles 1 constituting the powder for a magnet each have a texture in which grains of a phase 3 of a hydride of a rare-earth element are dispersed in a phase 2 of an iron-containing material, such as Fe. The uniform presence of the phase 2 of the iron-containing material in each magnetic particle 1 results in the powder having excellent formability, thereby providing a powder compact 4 having a high relative density. The powder for a magnet is produced by heat-treating a rare-earth-iron-based alloy powder in a hydrogen atmosphere to separate the rare-earth element and the iron-containing material from each other and then forming a hydride of the rare-earth element. The powder for a magnet is subjected to compacting to form the powder compact 4. The powder compact 4 is subjected to heat treatment in vacuum to form a rare-earth-iron-based alloy material 5. The rare-earth-iron-based alloy material 5 is subjected to heat treatment in a nitrogen atmosphere to form a rare-earth-iron-nitrogen-based alloy material 6.
Abstract:
PROBLEM TO BE SOLVED: To provide a component made from a material of metal matrix composite, a so-called MMC material, which is manufactured by High Speed Machining, so-called HSM machining, of a workpiece or blank of MMC material to provide a predetermined shape.SOLUTION: In the HSM machining, the cutting tool operates at a very high speed in relation to the machined workpiece, especially as compared to what is normally the case when using conventional machining techniques.
Abstract:
[Problem] To provide a rare-earth sintered magnet with improved corrosion resistance. [Solution] This rare-earth sintered magnet is a rare-earth permanent magnet having an R-T-B composition (R is at least one type of element selected from Y and the rare-earth elements, T is at least one type of metal element including Fe or Fe and Co, and B is B or B and C), wherein during an R-rich phase (R is a rare-earth element), which is when the atom ratio at the grain-boundary triple point is (Fe+Co)/(LR+HR+Fe+Co) =0.01 (atom ratio) exists in the R-rich phase, the surface-area ratio within the region HR/(LR+HR)>=0.01 accounted for by the grain-boundary triple points being between 10% and 90%.