1. A rare-earth permanent magnet based on Nd\u2014Fe\u2014B, wherein a residual nitrogen concentration after sintering is 800 ppm or lower.
2. The rare-earth permanent magnet according to claim 1, manufactured through steps of:
milling magnet material in an atmosphere of a noble gas to obtain magnet powder;
forming the magnet powder into a formed body in an atmosphere of a noble gas; and
sintering the formed body.
3. The rare-earth permanent magnet according to claim 2, wherein, before the step of sintering the formed body, the formed body is calcined in a hydrogen atmosphere at a pressure equal to or higher than normal atmospheric pressure.
4. The rare-earth permanent magnet according to claim 2, wherein, before the step of forming the magnet powder into a formed body, the magnet powder is calcined in a hydrogen atmosphere at a pressure equal to or higher than normal atmospheric pressure.
5. The rare-earth permanent magnet according to claim 2, wherein:
in the step of forming the magnet powder into a formed body, the magnet powder is mixed with a binder resin to produce a mixture and the mixture is formed into a sheet like shape to obtain a green sheet as the formed body;
the steps of manufacturing further include a step of decomposing and removing the binder resin from the green sheet by holding the green sheet for a predetermined length of time at decomposition temperature of the binder resin in a non-oxidizing atmosphere; and
in the step of sintering the formed body, the green sheet after removing the binder resin is sintered through raising temperature up to sintering temperature.
6. The rare-earth permanent magnet according to claim 5, wherein, in the step of decomposing and removing the binder resin, the green sheet is held for a predetermined length of time in the non-oxidizing atmosphere at a pressure equal to or higher than normal atmospheric pressure.
7. A manufacturing method of a rare-earth permanent magnet based on Nd\u2014Fe\u2014B, comprising steps of:
milling magnet material in an atmosphere of a noble gas to obtain magnet powder;
forming the magnet powder into a formed body in an atmosphere of a noble gas; and
sintering the formed body.
8. The manufacturing method of a rare-earth permanent magnet according to claim 7, wherein, before the step of sintering the formed body, the formed body is calcined in a hydrogen atmosphere at a pressure equal to or higher than normal atmospheric pressure.
9. The manufacturing method of a rare-earth permanent magnet according to claim 7, wherein, before the step of forming the magnet powder into a formed body, the magnet powder is calcined in a hydrogen atmosphere at a pressure equal to or higher than normal atmospheric pressure.
10. The manufacturing method of a rare-earth permanent magnet according to claim 7, wherein:
in the step of forming the magnet powder into a formed body, the magnet powder is mixed with a binder resin to produce a mixture and the mixture is formed into a sheet like shape to obtain a green sheet as the formed body;
the steps of the manufacturing method further include a step of decomposing and removing the binder resin from the green sheet by holding the green sheet for a predetermined length of time at decomposition temperature of the binder resin in a non-oxidizing atmosphere; and
in the step of sintering the formed body, the green sheet after removing the binder resin is sintered through raising temperature up to sintering temperature.
11. The manufacturing method of a rare-earth permanent magnet according to claim 10, wherein, in the step of decomposing and removing the binder resin, the green sheet is held for a predetermined length of time in the non-oxidizing atmosphere at a pressure equal to or higher than normal atmospheric pressure.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method for preventing or ameliorating obesity, which method comprises administering potassium alginate to a subject in need thereof or having the subject take potassium alginate.
2. A method for inhibiting accumulation of visceral fat, which method comprises administering potassium alginate to a subject in need thereof or having the subject take potassium alginate.
3. A method for inhibiting accumulation of liver lipid, which method comprises administering potassium alginate to a subject in need thereof or having the subject take potassium alginate.
4. A method for preventing or ameliorating fatty liver, which method comprises administering potassium alginate to a subject in need thereof or having the subject take potassium alginate.
5. The method for preventing or ameliorating obesity according to claim 1, wherein potassium alginate has a weight average molecular weight of 10,000 to 60,000.
6. The method for inhibiting accumulation of visceral fat according to claim 2, wherein potassium alginate has a weight average molecular weight of 10,000 to 60,000.
7. The method for inhibiting accumulation of liver lipid according to claim 3, wherein potassium alginate has a weight average molecular weight of 10,000 to 60,000.
8. The method for preventing or ameliorating fatty liver according to claim 4, wherein potassium alginate has a weight average molecular weight of 10,000 to 60,000.