JP2003188006A5 - - Google Patents

Claims (15)

In an alloy flake for a rare earth magnet made of an R-T-B alloy (where R is at least one of rare earth elements including Y, T is a transition metal in which Fe is essential, and B is boron) An alloy flake for rare earth magnets having a thickness of 0.1 mm or more and 0.5 mm or less and a surface roughness of at least one surface of the alloy flake of 10-point average roughness (Rz) of 5 μm or more and 50 μm or less. 2. The alloy flakes for rare earth magnets according to claim 1, wherein the surface roughness of at least one surface of the alloy flakes is 7 μm or more and 25 μm or less in terms of 10-point average roughness (Rz). 3. The alloy flake for rare earth magnet according to claim 1, wherein the volume fraction of the fine R-rich phase region in the alloy is 20% or less. The alloy flake for a rare earth magnet according to any one of claims 1 to 3, wherein the RTB-based alloy is an Nd-Fe-B-based alloy. The RTB-based alloy contains one or more elements selected from the group consisting of Co, Al, Cu, and Ga, according to any one of claims 1 to 4. Alloy flakes for rare earth magnets. In the method for producing an alloy flake of a rare earth magnet made of an R-T-B alloy by a strip casting method, the surface roughness of the casting surface of the rotary roll for casting is 5 μm or more and 100 μm or less in terms of 10-point average roughness (Rz) A method for producing an alloy flake for rare earth magnets. In the method for producing an alloy flake for a rare earth magnet made of an R-T-B alloy by a strip casting method, the surface roughness of the casting surface of the rotary roll for casting is 5 μm or more and 100 μm or less in terms of 10-point average roughness (Rz). The method for producing an alloy flake for a rare earth magnet according to any one of claims 1 to 5 . The method for producing an alloy flake for a rare earth magnet according to claim 6 or 7, wherein the RTB-based alloy is an Nd-Fe-B-based alloy. The RTB-based alloy contains any one or more elements selected from the group consisting of Co, Al, Cu, and Ga, according to any one of claims 6 to 8. A method for producing alloy flakes for rare earth magnets. 10. The rare earth magnet alloy flake according to claim 6 , wherein the surface roughness of the casting surface of the casting rotary roll is 10 μm or more and 50 μm or less in terms of 10-point average roughness (Rz). Manufacturing method. A method for producing an alloy powder for a rare earth magnet, comprising subjecting the alloy flake for a rare earth magnet according to any one of claims 1 to 5 to a hydrogen crushing step and then pulverizing with a jet mill. An alloy powder for a rare earth sintered magnet produced by subjecting the alloy flake for a rare earth magnet according to any one of claims 1 to 5 to a hydrogen crushing step and then jet milling. A rare earth sintered magnet produced by powder metallurgy from the rare earth magnet alloy powder according to claim 12 . An alloy powder for bonded magnets produced by the HDDR method using the alloy flakes for rare earth magnets according to any one of claims 1 to 5 . The bonded magnet produced using the alloy powder for bonded magnets of Claim 14 .