Iron nitride based magnetic powder and magnet using the same
An iron nitride-based, magnetic technology, applied in the field of magnetic powder, can solve problems such as difficult chemical synthesis and difficult magnetic materials
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Embodiment 1
[0051]
[0052] Use ferrous sulfate, ferric chloride and sodium hydroxide to make a specific surface area of 115m 2 / g of iron oxide 1. In the same way, the specific surface area is 187m 2 / g of iron oxide 2. The obtained two types of iron oxides were mixed in the state of a dispersion liquid and stirred at room temperature for 2 hours. Afterwards, leave to stand for several hours to remove the supernatant. Next, 200 ml of pure water was added to 1 g of the obtained sample, and the supernatant was removed, and the above operation was repeated 7 times. Drying was performed in a vacuum dryer at 85° C., and pulverization was performed using a mortar and pestle.
[0053]
[0054] 5 g of the powder obtained above was put into an ash jar (50 mm×30 mm×10 mm deep) for ash content measurement and left still in a heat treatment furnace. After filling the furnace with nitrogen, the temperature was raised to 250° C. at a rate of 5° C. / min while flowing hydrogen at a flow rate o...
Embodiment 2
[0056] Iron oxide 1 and iron oxide 2 as raw materials were produced in the same manner as in Example 1. Thereafter, pure water equivalent to 50 ml was added with respect to 1 g of the sample, and an aqueous sodium orthosilicate solution was added so that Si became 1.0% by mass while stirring. 200 mL of pure water was added to 1 g of the obtained sample again, left still for several hours, and washed by removing the supernatant. Next, it was dried in a vacuum dryer at 85°C, and pulverized using a mortar and pestle. The Si content of the obtained sample was 1.0% by mass.
[0057] Next, reduction treatment and nitriding treatment are performed. Samples were prepared under the same conditions as in Example 1 except that the reduction treatment was carried out at 300° C. for 24 hours and the nitriding treatment was carried out at 150° C. for 9 hours.
[0058] As for Examples 3 to 14 and Comparative Examples 1 to 10, except for the specific surface area and Si content of iron oxide...
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