E pili ana i nā Magnets

He aha nā Neodymium Magnets

ʻO nā magnet neodymium (pōkole: NdFeb magnets) ʻo ia ka mea ikaika loa i loaʻa i ke kālepa, ma nā wahi a pau o ka honua. Hāʻawi lākou i nā pae like ʻole o ka magnetism a me ke kūʻē ʻana i ka demagnetization ke hoʻohālikelike ʻia me Ferrite, Alnico a me nā magnet Samarium-cobalt.
Hoʻopaʻa ʻia nā magnet Neodymium e like me kā lākou huahana ikehu kiʻekiʻe, e pili ana i ka puka makani flux ma kēlā me kēia leo. Hōʻike nā waiwai kiʻekiʻe i nā magnet ikaika. No nā mākēneki NdFeB sintered, aia kahi hoʻohālikelike honua ākea. ʻO kā lākou mau waiwai mai ka 28 a hiki i ka 55. ʻO ka leka mua N ma mua o nā waiwai he pōkole no ka neodymium, ʻo ia hoʻi nā mea magnet NdFeB sintered.
ʻOi aku ka kiʻekiʻe o ka neodymium magnet, ʻoi aku ka kiʻekiʻe o ka coercivity a me ka huahana ikehu, akā ʻoi aku ka haʻahaʻa o ka mahana Curie ma mua o nā ʻano magnet ʻē aʻe. ʻO nā ʻāpana magnet neodymium kūikawā e komo pū me ka terbium a me
Ua hoʻomohala ʻia ka dysprosium i ʻoi aku ka kiʻekiʻe o ka mahana Curie, e ʻae iā lākou e ʻae i nā mahana kiʻekiʻe. ʻO ka papa ma lalo nei e hoʻohālikelike i ka hana magnetic o nā neodymium magnets me nā ʻano ʻē aʻe o nā magnet mau loa.

He aha ka mea e hoʻohana ai i nā magnet neodymium? Ma muli o ka ikaika o nā magnet neodymium, nui loa ko lākou hoʻohana ʻana. Hana ʻia lākou no ke keʻena, ʻoihana a me nā pono ʻoihana, i hoʻohana ʻia i nā ʻano turbines makani,
nā mea haʻiʻōlelo, nā pepeiao a me nā kaʻa, nā microphones, nā mea ʻike, ka mālama olakino, ka ʻeke, nā mea haʻuki, nā mea hana a me nā kahua mokulele.

He aha nā Ferrite Magnets

Mākēneki Ferrite ma waho aʻe o nā mākēneki ferrite paʻakikī a me nā mākēneki palupalu.
He kiʻekiʻe ka coercivity i nā ferrites paʻakikī, no laila paʻakikī ke demagnetize. Hoʻohana ʻia lākou e hana i nā magnet mau loa no nā noi e like me ka friji, nā leo leo, a me nā kaʻa uila liʻiliʻi a pēlā aku.

He haʻahaʻa ko nā ferrites palupalu, no laila e hoʻololi maʻalahi lākou i kā lākou magnetization a hana ma ke ʻano he alakaʻi o nā māla magnetic. Hoʻohana ʻia lākou i ka ʻoihana uila e hana i nā cores magnetic kūpono i kapa ʻia ʻo ferrite cores no nā inductors kiʻekiʻe-frequency, transformers a me nā antennas, a ma nā ʻāpana microwave like ʻole.

He haʻahaʻa loa ke kumukūʻai o nā pūhui Ferrite, i hana ʻia me ka nui o ka hao oxide, a he kūpaʻa maikaʻi loa ka corrosion.
He aha nā Alnico Magnets
ʻO nā magnet Alnico he mau magnet mau loa i hana mua ʻia me ka hui ʻana o ka alumini, nickel a me ka cobalt akā hiki ke komo pū me ke keleawe, ka hao a me ka titanium.
Hele mai lākou ma ka isotropic, non-directional, a i ʻole anisotropic, mono-directional, ʻano. I ka manawa e hoʻokalakupua ʻia ai, loaʻa iā lākou he 5 a 17 manawa i ka ikaika o ka magnetite a i ʻole ka lodestone, ʻo ia nā mea magnetika maoli e huki ai i ka hao.
He haʻahaʻa haʻahaʻa haʻahaʻa ko Alnico magnets a hiki ke calibrated no ka hoʻokomo ʻana i ke koena kiʻekiʻe no ka hoʻohana ʻana i nā noi wela kiʻekiʻe e like me 930 ° F a i ʻole 500 ° C. Hoʻohana ʻia lākou i kahi e pono ai ka pale ʻana i ka corrosion a no nā ʻano ʻano like ʻole.

He aha ka Samarium-cobalt Magnet (SmCo Magnet)

ʻO ka magnet samarium-kobalt (SmCo), he ʻano o ka loaʻa-honua honua, he mākēneki paʻa ikaika i hana ʻia i ʻelua mau mea kumu: Samarium a me cobalt. nā papa helu a me ka coercivity kiʻekiʻe.
ʻO kekahi mau hiʻohiʻona o SmCo:
Kūleʻa loa nā magneti Samarium-cobalt i ka demagnetization.
Loaʻa i kēia mau mea magnet ke kūpaʻa wela maikaʻi (nā wela hoʻohana kiʻekiʻe ma waena o 250 °C (523 K) a me 550 °C (823 K); ʻO nā mahana Curie mai 700 °C (973 K) a i 800 °C (1,070 K).
He pipiʻi lākou a pili i ke kumukūʻai kūʻai (koʻikoʻi ke kumu kūʻai o ka kobalt).
He kū'ē ikaika nā SmCo i ka corrosion a me ka pale ʻana i ka oxidation, maʻamau ʻaʻole pono e uhi ʻia a hiki ke hoʻohana nui ʻia i ka wela kiʻekiʻe a me nā kūlana hana maikaʻi ʻole. He palupalu lākou, a hiki i ka pohā a me ka ʻokiʻoki. Loaʻa i nā mākēneki Samarium–kobalt nā huahana ikehu kiʻekiʻe (BHmax) mai ka 14 megagauss-oersteds (MG·Oe) a i ka 33 MG·Oe, ʻo ia hoʻi. 112 kJ/m3 i 264 kJ/m3; ʻO ko lākou palena manaʻo he 34 MG·Oe, ma kahi o 272 kJ/m3.
ʻO nā mea hoʻohana ʻē aʻe he:
1. ʻO nā motika uila kiʻekiʻe i hoʻohana ʻia i nā papa hoʻokūkū ʻoi aku ma ka slotcar racingTurbomachinery.
2. Mākēneki kahua o ka paipu hawewe hele.
3. Nā noi e koi ana i ka ʻōnaehana e hana i nā mahana cryogenic a i ʻole nā ​​wela wela loa (ma luna o 180 °C).
4. ʻO nā noi e pono ai ka hana e kūlike me ka hoʻololi wela.
5. Nā kikoʻī NMR Benchtop.
6. Rotary encoders kahi e hana ai i ka hana o ka mea hoʻokele magnetic.