Ka hāʻawi kūikawā o ka pauka alumina i nā mea magnetic
Ke hoʻokaʻawale ʻoe i kahi motika servo wikiwiki a i ʻole kahi ʻāpana hoʻokele ikaika ma kahi kaʻa ikehu hou, e ʻike ʻoe aia mau nā mea magnetic precision ma ke kumu. Ke kūkākūkā nei nā ʻenekinia i ka ikaika coercive a me ka ikaika magnetic koena o nā magnet, kakaikahi ka poʻe e ʻike he pauka keʻokeʻo maʻamau.pauka alumina(Al₂O₃), ke pāʻani mālie nei i ke kuleana o kahi "hero ma hope o nā hiʻohiʻona". ʻAʻohe ona magnetism, akā hiki iā ia ke hoʻololi i ka hana o nā mea magnetic; ʻaʻole ia he conductive, akā he hopena koʻikoʻi kona i ka pono hoʻololi o ke au. I ka ʻoihana hou e alualu ana i nā waiwai magnetic hope loa, ʻike nui ʻia ka hāʻawi kūikawā o ka pauka alumina.
I loko o ke aupuni o nā ferrites, he "kupua palena palaoa"
I kona komo ʻana i loko o kahi hale hana hana ferrite palupalu nui, ua piha ka lewa i ke ʻala kūikawā o ka sintering wela kiʻekiʻe. ʻŌlelo pinepine ʻo Old Zhang, he mea hana lima akamai ma ka laina hana: "I ka wā ma mua, ʻo ka hana ʻana i ka manganese-zinc ferrite ua like ia me nā buns mahu. Inā ʻoi aku ka ʻino o ka wela, e loaʻa nā pores 'i moʻa' i loko, a ʻaʻole e iho mai ka pohō." I kēia lā, ua hoʻokomo pololei ʻia kahi nui o ka pauka alumina i loko o ke ʻano hana, a ʻokoʻa loa ke kūlana.
ʻO ke kuleana koʻikoʻi o ka pauka alumina ma ʻaneʻi hiki ke kapa ʻia ʻo "ʻenekinia palena palaoa": ua hoʻolaha like ʻia ma nā palena ma waena o nā hua ferrite. E noʻonoʻo i ka hoʻonohonoho pono ʻia ʻana o nā hua liʻiliʻi he nui ʻole, a ʻo kā lākou mau hui pinepine nā loulou nāwaliwali i nā waiwai magnetic a me nā "wahi i hoʻopilikia nui ʻia" o ka pohō magnetic. ʻO ka pauka alumina kiʻekiʻe-maʻemaʻe, ultra-fine (ʻo ka pae submicron maʻamau) i hoʻokomo ʻia i loko o kēia mau wahi palena palaoa. Ua like lākou me nā "dams" liʻiliʻi he nui ʻole, kahi e kāohi pono ai i ka ulu nui ʻana o nā hua i ka wā o ka sintering wela kiʻekiʻe, e hoʻolilo ana i ka nui o ka hua i liʻiliʻi a hoʻolaha like ʻia.
Ma ke kahua kaua o ka magnetism paʻakikī, he "mea hoʻopaʻa kūkulu"
E hoʻohuli i kou manaʻo i ke ao o nā magnet paʻa neodymium iron boron (NdFeB) hana kiʻekiʻe. ʻO kēia mea, i ʻike ʻia ʻo "ke aliʻi o nā magnet", he nui ka ikehu kupaianaha a ʻo ia ke kumu mana nui no ka hoʻokele ʻana i nā kaʻa uila hou, nā turbine makani, a me nā mea lapaʻau kikoʻī. Eia nō naʻe, aia kahi pilikia nui i mua: Loaʻa iā NdFeB ka "demagnetization" i nā mahana kiʻekiʻe, a ʻo kona ʻano waiwai neodymium kūloko he palupalu a nele i ke kūpaʻa kūkulu.
I kēia manawa, ʻike hou ʻia kahi nui o ka pauka alumina, e pāʻani ana i ke kuleana koʻikoʻi o ka "hoʻonui kūkulu". I ka wā o ke kaʻina hana sintering o NdFeB, hoʻokomo ʻia ka pauka alumina ultrafine. ʻAʻole ia e komo i ka lattice pae nui ma nā nui he nui, akā ua hoʻolaha koho ʻia ma nā palena palaoa, ʻoiai kēlā mau wahi pae momona neodymium nāwaliwali.
Ma ke alo o nā magnet composite, he "mea hoʻonohonoho multi-faceted"
Ke loli mau nei ke ao o nā mea magnetic. ʻO kahi ʻano magnet composite (e like me ka Halbach array) e hoʻohui i ka ikaika induction magnetic saturation kiʻekiʻe a me nā ʻano pohō haʻahaʻa o nā mea magnetic palupalu (e like me nā ʻiole pauka hao) a me nā pono ikaika coercive kiʻekiʻe o nā mea magnetic mau loa e huki nei i ka manaʻo. Ma kēia ʻano hoʻolālā hou, ua loaʻa i ka pauka alumina kahi pae hou.
I ka wā e pono ai ke hoʻohui i nā pauka magnetic o nā waiwai like ʻole (ʻoiai me nā pauka hana non-magnetic) a kāohi pono i ka insulation a me ka ikaika mechanical o ka ʻāpana hope loa, lilo ka pauka alumina i mea uhi insulating kūpono a i ʻole ka hoʻopihapiha me kona insulation maikaʻi loa, inertness kemika a me ka hoʻohālikelike maikaʻi me nā ʻano mea like ʻole.
ʻO ke kukui o ka wā e hiki mai ana: ʻoi aku ka maalea a me ke akamai
ʻO ka hoʻopili ʻana opauka aluminama ke kahua onā mea makenekaʻaʻole i pau. Me ka hoʻoikaika ʻana o ka noiʻi, ua kūpaʻa nā kānaka ʻepekema i ka ʻimi ʻana i nā hoʻoponopono unahi maalea:
ʻO ka nano-scale a me ka doping pololei: E hoʻohana i ka pauka alumina nano-scale me ka nui like a me ka hoʻopuehu maikaʻi ʻana, a e ʻimi pū i kāna ʻano hoʻoponopono pololei o ka pinning wall domain magnetic ma ka unahi atomika.
ʻO ka pauka alumina, kēia oxide maʻamau mai ka honua mai, ma lalo o ka mālamalama o ke akamai kanaka, hana i ka hana kilokilo hiki ke ʻike ʻia ma ka honua magnetic ʻike ʻole ʻia. ʻAʻole ia e hoʻoulu i kahi kahua magnetic, akā e hoʻomākaukau ana i ke ala no ka hoʻoili paʻa a me ka maikaʻi o ke kahua magnetic; ʻaʻole ia e hoʻokele pololei i ka hāmeʻa, akā e hoʻokomo i ka ikaika ikaika i loko o ka mea magnetic koʻikoʻi o ka hāmeʻa hoʻokele. I ka wā e hiki mai ana o ka hahai ʻana i ka ikehu ʻōmaʻomaʻo, ka hoʻokele uila kūpono a me ka ʻike akamai, ʻo ka hāʻawi kū hoʻokahi a pono ʻole o ka pauka alumina i nā mea magnetic e hoʻomau i ka hāʻawi ʻana i ke kākoʻo paʻa a mālie no ka hoʻomohala ʻana i ka ʻepekema a me ka ʻenehana. Hoʻomanaʻo mai ia iā mākou i loko o ka symphony nui o ka ʻepekema a me ka ʻenehana hou, ʻo nā memo kumu loa e loaʻa pinepine ka mana hohonu loa - i ka wā e hui ai ka ʻepekema a me ka hana lima, e ʻālohilohi pū nā mea maʻamau me ka mālamalama kupaianaha.