Hiki ke hoʻohana ʻia nā magnet samarium cobalt no nā makahiki ʻoi aku ma mua o ʻumi-—ka paʻa lōʻihi o ka samarium cobalt i ka wela kiʻekiʻe

ʻO ke kūpaʻa lōʻihi o nā magnet he mea hopohopo ia o kēlā me kēia mea hoʻohana. ʻOi aku ka koʻikoʻi o ka paʻa ʻana o nā magnet samarium cobalt (SmCo) no kā lākou hoʻohana paʻakikī. I ka makahiki 2000, ʻo Chen^[1]a me Liu^[2]et al., e aʻo i ka haku mele ʻana a me ke ʻano o ka SmCo wela kiʻekiʻe, a ua hoʻomohala i nā kiʻekiʻe wela-kū kūʻē i nā magnet samarium-cobalt. ʻO ka wela hana kiʻekiʻe loa (T_max) o nā mākēneki SmCo ua hoʻonui ʻia mai 350°C a i 550°C. Ma hope o kēlā, ʻo Chen et al. hoʻomaikaʻi i ka pale ʻana o ka oxidation o SmCo ma ka waiho ʻana i ka nickel, aluminika a me nā uhi ʻē aʻe ma luna o nā magnet SmCo.

Ma 2014, Dr. Mao Shoudong, ka mea hoʻokumu o "MagnetPower", systematically aʻo i ka paʻa o SmCo ma kiʻekiʻe wela, a ua paʻi 'ia nā hualoaʻa ma JAP.^[3]. ʻO nā hopena maʻamau penei:

1. I ka manawaSmCoaia i loko o kahi kūlana wela kiʻekiʻe (500 ° C, ea), maʻalahi ke hana i kahi papa hoʻohaʻahaʻa ma ka ʻili. ʻO ka papa hoʻohaʻahaʻa ka mea nui i haku ʻia me kahi unahi waho (ua pau ʻo Samarium) a me kahi papa o loko (he nui nā oxides). Ua luku loa ʻia ke ʻano kumu o nā magnet SmCo i ka papa degradation. E like me ka hōʻike ʻana ma ka Figure 1 a me Figure 2.

Fig.1. ʻO nā micrographs optical o ka Sm₂Co₁₇mālama ʻia nā magnet isothermal i ka ea ma 500 °C no nā manawa like ʻole. ʻO nā papa hoʻohaʻahaʻa ma lalo o nā ʻili he (a) kūlike a me (b) kū pololei i ke axis c.

Fig.2. ʻO ka micrograph BSE a me nā mea EDS laina-scan ma o ka Sm₂Co₁₇mālama ʻia nā magnet isothermal i ka ea ma 500 °C no 192 mau hola.

2. ʻO ka hana nui o ka papa hoʻohaʻahaʻa e pili nui ana i nā waiwai magnetic o SmCo, e like me ka mea i hōʻike ʻia ma ke Kiʻi 3. ʻO nā papa hoʻohaʻahaʻa i hana nui ʻia me ka Co(Fe) solution solid, CoFe2O4, Sm2O3, a me ZrOx i loko o nā papa o loko a me Fe3O4, CoFe2O4, a me CuO ma na unahi waho. ʻO ka Co(Fe), CoFe2O4, a me Fe3O4 i hana ʻia ma ke ʻano he mau ʻāpana magnetic palupalu i hoʻohālikelike ʻia me ka māhele magnetic paʻakikī o nā kikowaena Sm2Co17 i hoʻopilikia ʻole ʻia. Pono e mālama ʻia ka hana hoʻohaʻahaʻa.

Fig. 3. Na kaha hookiekie o Sm₂Co₁₇mālama ʻia nā magnet isothermal i ka ea ma 500 °C no nā manawa like ʻole. ʻO ka mahana ho'āʻo o nā pihi magnetization he 298 K. ʻO ke kahua waho H e like me ka c-axis alignment o ka Sm.₂Co₁₇magnets.

3. Inā waiho 'ia nā pale me ke kūpa'a ho'okikene ki'eki'e ma luna o SmCo e ho'ololi i nā kā'ei electroplating mua, hiki ke ho'oemi nui 'ia ke ka'ina hana ho'oha'aha'a o SmCo a hiki ke ho'omaika'i 'ia ke kūpa'a o SmCo, e like me ka hō'ike 'ana ma ka Figure 4.A i ʻole ka uhi ʻanakaohi nui i ka piʻi kaumaha o ka SmCo a me ka nalowale o nā waiwai magnetic.

Fig.4 ka hoʻolālā o ke kūpaʻa oxidation OR ka uhi ʻana ma ka Sm₂Co₁₇magnet.

Ua hana ʻo "MagnetPower" i nā hoʻokolohua o ke kūpaʻa lōʻihi (~ 4000hours) i ka wela kiʻekiʻe, hiki ke hāʻawi i kahi kuhikuhi paʻa o nā magnet SmCo no ka hoʻohana ʻana i ka wā e hiki mai ana i nā wela kiʻekiʻe.

I ka makahiki 2021, ma muli o ke koi wela o ka hana ʻana, ua hoʻomohala ʻo "MagnetPower" i kahi ʻano o nā māka mai 350°C a i 550°C （T moʻo）. Hiki i kēia mau māka ke hāʻawi i nā koho kūpono no ka noi SmCo wela kiʻekiʻe, a ʻoi aku ka maikaʻi o nā waiwai magnetic. E like me ka mea i hōʻike ʻia ma ke Kiʻi 5. E ʻoluʻolu e nānā i ka ʻaoʻao pūnaewele no nā kikoʻī:https://www.magnetpower-tech.com/t-series-sm2co17-smco-magnet-supplier-product/

Fig.5 Nā mākēneki SmCo wela kiʻekiʻe (T series) o "MagnetPower"

OLELO HOOLAHA

1. Ma ke ʻano he mau magnet mau loa paʻa loa, hiki ke hoʻohana ʻia ʻo SmCo ma ke kiʻekiʻe wela (≥350 ° C) no kahi manawa pōkole. Hiki ke hoʻohana ʻia ke kiʻekiʻe wela SmCo (T series) ma 550 ° C me ka ʻole o ka demagnetization.

2. Eia nō naʻe, inā hoʻohana ʻia nā magnet SmCo i ka wela kiʻekiʻe (≥350 ° C) no ka manawa lōʻihi, hiki i ka ʻili ke hana i kahi papa degradation. ʻO ka hoʻohana ʻana i ka pale anti-oxidation hiki ke hōʻoia i ka paʻa o ka SmCo ma ke kiʻekiʻe wela.

Kuhikuhi

[1] CHhen, IEEE Transactions on Magnetics, 36, 3291-3293, (2000);

[2] JF Liu, Journal of Applied Physics, 85, 2800-2804, (1999);

[3] Shoudong Mao, Journal of Applied Physics, 115, 043912,1-6 (2014)