Hāʻawi kūʻokoʻa o ka pauka alumina i nā mea magnetic
Ke hoʻokaʻawale ʻoe i kahi kaʻa servo kiʻekiʻe a i ʻole kahi kaʻa kaʻa ikaika ma luna o kahi kaʻa ikehu hou, e ʻike ʻoe aia nā mea magnetic precision ma ke kumu. Ke kamaʻilio nei nā mea ʻenekinia i ka ikaika hoʻoikaika a me ke koena o ka ikaika magnetic o nā magnet, kakaikahi ka poʻe e ʻike i kahi pauka keʻokeʻo maʻamau,alumina pauka(Al₂O₃), ke pāʻani mālie nei ʻo ia i ke ʻano o ka "hero behind the scenes". ʻAʻohe ona magnetism, akā hiki iā ia ke hoʻololi i ka hana o nā mea magnetic; he non-conductive, akā he hopena koʻikoʻi i ka hoʻololi ʻana i ka pono o kēia manawa. I ka ʻoihana hou e ʻimi nei i nā waiwai magnetic hope loa, ʻike ʻia ka hāʻawi kūʻokoʻa o ka pauka alumina.
Ma ke aupuni o ferrites, he "kupua palena palaoa“
Ke hele nei i loko o kahi hale hana hana ferrite palupalu nui, piha ka ea i ka ʻala kūikawā o ka sintering wela kiʻekiʻe. Ua ʻōlelo pinepine ʻo Old Zhang, he mea hana akamai ma ka laina hana: "I ka wā ma mua, ʻo ka hana ʻana i ka manganese-zinc ferrite ua like ia me nā ʻōpala mahu. I kēia lā, hoʻokomo pololei ʻia kahi ʻāpana o ka pauka alumina i loko o ke ʻano, a ʻokoʻa loa ke kūlana.
Hiki ke kapa ʻia ke kuleana nui o ka pauka alumina ma ʻaneʻi ʻo "grain boundary engineering": ua māhele like ʻia ma nā palena ma waena o nā hua ferrite. E noʻonoʻo i ka helu ʻana o nā hua liʻiliʻi liʻiliʻi i hoʻonohonoho pono ʻia, a ʻo kā lākou hui ʻana he mau loulou nāwaliwali i nā waiwai magnetic a me nā "wahi paʻakikī loa" o ka nalowale ʻana. Hoʻokomo ʻia ka pauka alumina maʻemaʻe kiʻekiʻe a maikaʻi loa (ma ka pae submicron maʻamau) i loko o kēia mau wahi palena palaoa. Ua like lākou me nā "dams" liʻiliʻi liʻiliʻi he nui, kahi e pale pono ai i ka ulu nui ʻana o nā kīʻaha i ka wā o ka sintering kiʻekiʻe, e liʻiliʻi ai ka nui o ka palaoa a me ka puʻunaue like.
Ma ke kahua kaua o ka magnetism paʻakikī, he "mea hoʻopaʻa paʻa“
E hoʻohuli i kou manaʻo i ka honua o ka neodymium iron boron (NdFeB) hana kiʻekiʻe. ʻO kēia mea, i kapa ʻia ʻo "king of magnets", he ʻano ikehu kamahaʻo a ʻo ia ke kumu mana nui no ka hoʻokele ʻana i nā kaʻa uila hou, nā makani makani, a me nā mea lapaʻau pololei. Eia nō naʻe, aia kahi paʻakikī nui ma mua: He maʻalahi ka NdFeB i ka "demagnetization" i nā wela kiʻekiʻe, a ʻo kona ʻano neodymium-waiwai kūloko he palupalu a nele i ka paʻa o ka hoʻolālā.
I kēia manawa, ʻike hou ʻia kahi ʻāpana o ka pauka alumina, e pāʻani ana i ke kuleana koʻikoʻi o ka "hoʻonui hoʻolālā". I ka wā o ka sintering o NdFeB, hoʻokomo ʻia ka pauka alumina ultrafine. ʻAʻole ia e komo i ka lattice pae nui i ka nui, akā ua puʻunaue wale ʻia ma nā palena o ka palaoa, ʻoi aku ka nāwaliwali o nā wahi neodymium waiwai nui.
Ma ke alo o nā magnet composite, he "coordinator multi-faceted"
Ke ulu nei ka honua o nā mea magnetic. ʻO kahi hoʻolālā magnet composite (e like me Halbach array) e hoʻohui i ka saturation magnetic induction intensity a me nā hiʻohiʻona haʻahaʻa haʻahaʻa o nā mea magnetic palupalu (e like me ka pauka hao) a me nā pono ikaika ikaika o nā mea magnetic mau loa e huki nei i ka nānā. Ma kēia ʻano hoʻolālā hou, ua loaʻa i ka pauka alumina kahi pae hou.
I ka wā e pono ai e hoʻohui i nā pauka magnetic o nā waiwai like ʻole (ʻoiai me nā pauka hana non-magnetic) a me ka hoʻomalu pono ʻana i ka insulation a me ka ikaika mechanical o ka mea hope loa, lilo ka pauka alumina i mea hoʻopili insulating kūpono a i ʻole ka hoʻopiha piha ʻana me kona insulation maikaʻi loa, kemika inertness a me ka hoʻohālikelike maikaʻi me nā ʻano mea like ʻole.
ʻO ka mālamalama o ka wā e hiki mai ana: ʻoi aku ka maʻalahi a me ke akamai
ʻO ka noi oalumina paukama ke kahua omea hoʻopalekanamamao loa aku. Me ka hohonu o ka noiʻi ʻana, ua kūpaʻa ka poʻe ʻepekema i ka ʻimi ʻana i nā hoʻoponopono ʻano maʻalahi:
Nano-scale a me ka pololei doping: E hoʻohana i ka nano-scale alumina pauka me ka nui like 'ole a me ka maikai dispersion, a hiki i ka imi ana i kona pololei hooponopono ana o ka magnetic paʻi paia domain ma ka atomic unahiʻole.
ʻO ka pauka alumina, kēia oxide maʻamau mai ka honua, ma lalo o ka mālamalama o ka naʻauao kanaka, hana i ka hana kilokilo i loko o ka honua magnetic ʻike ʻole. ʻAʻole ia e hoʻohua i kahi māla magnetic, akā hoʻomākaukau i ke ala no ka hoʻoili paʻa a me ka maikaʻi o ka māla magnetic; ʻAʻole ia e hoʻokele pololei i ka hāmeʻa, akā e hoʻokomo i ka ikaika ʻoi aku ka ikaika i loko o ka mea magnetic kumu o ka mea hoʻokele. I ka wā e hiki mai ana o ka ʻimi ʻana i ka ikehu ʻōmaʻomaʻo, ka hoʻokele uila maikaʻi a me ka ʻike naʻauao, ʻo ka hāʻawi kūʻokoʻa a koʻikoʻi o ka pauka alumina i nā mea magnetic e hoʻomau i ke kākoʻo paʻa a me ka leo no ka hoʻomohala ʻana i ka ʻepekema a me ka ʻenehana. Hoʻomanaʻo mai ia iā mākou i loko o ke mele nui o ka ʻepekema a me ka ʻenehana hou, ʻo nā memo kumu loa i loaʻa ka mana hohonu loa - i ka wā e hui ai ka ʻepekema a me ka hana hana, e ʻā pū nā mea maʻamau me ka mālamalama kupaianaha.