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Neodymium Magnets, Sample 6: 78Fe-7B-15Nd Sintered (Sagawa 1988)
Masato Sagawa, Setsuo Fujimura, Yutaka Matsuura (Sumitomo Special Metals) · Public domain (expired patent)
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Neodymium Magnets, Sample 6: 78Fe-7B-15Nd Sintered (Sagawa 1988)

Neodymium magnets are iron, boron and neodymium. Sagawa's team at Sumitomo melted the three together, ground the casting to a powder finer than 10 µm, lined the grains up in a magnetic field while pressing them, and sintered the compact in argon. This is their sample 6, 78 % iron, 7 % boron and 15 % neodymium by atoms: 36.0 MGOe. Source: M. Sagawa et al. (Sumitomo Special Metals), US 4,770,723 (1988). Unknown: how the pure iron, the ferroboron and the neodymium metal are made, and how the finished magnets are magnetised; the patent does not say. The 1 kg weights are our arithmetic from the patent's atomic percentages. Picture: the patent's Fig. 8.
Mtaalamu
2 days

Maagizo

1

Weigh sample 6: 78 Fe, 7 B, 15 Nd

Sample 6 is 78 % iron, 7 % boron and 15 % neodymium by atoms. Use 99.9 % electrolytic iron, ferroboron (19.38 % B, 5.32 % Al, 0.74 % Si, 0.03 % C, the rest iron) and neodymium of 99.7 % or better. Ours: a 1 kg melt, by arithmetic: 616.3 g iron, 59.2 g ferroboron, 328.1 g neodymium. Unknown: how these three are made.

Vifaa kwa hatua hii:

Chuma cha elektrolisisiChuma cha elektrolisisi616.3 g
FeroboroniFeroboroni59.2 g
Metali ya neodimiamuMetali ya neodimiamu328.1 g

Zana zinazohitajika:

Mizani ya mizani-mbiliMizani ya mizani-mbili
2

Melt by high frequency in argon and cast

Melt the charge in a high-frequency (induction) furnace under argon and pour it into a water-cooled copper mould.

Zana zinazohitajika:

Tanuru la uingizajiTanuru la uingizaji
Kaure ya Udongo Mgumu wa MotoKaure ya Udongo Mgumu wa Moto
ArgoniArgoni
Mtungi wa gesi yenye shinikizoMtungi wa gesi yenye shinikizo
Kalibu ya shaba inayopozwa kwa majiKalibu ya shaba inayopozwa kwa maji
Glavu Zinazostahimili JotoGlavu Zinazostahimili Joto
3

Stamp to 35 mesh, ball-mill to 3-10 µm

Crush the casting in a stamp mill until it passes a 35-mesh sieve. Then grind it in a ball mill for 3 hours, to 3-10 µm.

Zana zinazohitajika:

Kinu cha MtwangoKinu cha Mtwango
Seti ya chekecheke (matundu ya viwango)Seti ya chekecheke (matundu ya viwango)
Kinu cha mipira ya chumaKinu cha mipira ya chuma
Miwani ya usalamaMiwani ya usalama
4

Press in a 10 kOe field at 1.5 t/cm²

Line the powder up in a magnetic field of 10 kOe and press it at 1.5 tonnes per cm². Unknown: the size and shape of the magnets.

Zana zinazohitajika:

Mashine ya kubana kwa uga wa sumakuMashine ya kubana kwa uga wa sumaku
5

Sinter in argon at 1000-1200 °C

Sinter the compacts at 1000-1200 °C for about one hour in argon, then let them cool. Sample 6 measured 12.9 kG remanence, 8.2 kOe coercivity and 36.0 MGOe.

Zana zinazohitajika:

Tanuru ya MrijaTanuru ya Mrija
ArgoniArgoni
Mtungi wa gesi yenye shinikizoMtungi wa gesi yenye shinikizo
Glavu Zinazostahimili JotoGlavu Zinazostahimili Joto
6

Magnetise the magnets

Unknown: how the sintered magnets are magnetised. Sagawa measures them on a B-H tracer but gives no magnetising field or apparatus.

Zana zinazohitajika:

Njia isiyojulikana ya kutia usumakuNjia isiyojulikana ya kutia usumaku

Vifaa

3

Zana Zinazohitajika

14

Mchoro huu unatengeneza

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Kishikilia nafasi

Mkusanyiko wa sumaku za neodimiamu

Free

144
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Kishikilia nafasi

Seti ya sumaku za neodimiamu

Free

265
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Blueprint zinazohusiana

Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni

Neodymium Magnets: Nd-Fe-B Alloy Milled, Pressed in a Field and Sintered (Sagawa 1988)

Neodymium Magnets: Nd-Fe-B Alloy Milled, Pressed in a Field and Sintered (Sagawa 1988)

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