Igalelo elikhethekileyo le-alumina powder kwizinto eziphathekayo zamagnetic
Xa uqhaqha i-servo motor enesantya esiphezulu okanye iyunithi yokuqhuba enamandla kwisithuthi samandla esitsha, uya kufumanisa ukuba izinto ezichanekileyo zemagneti zihlala zingundoqo. Xa iinjineli zixoxa ngamandla okunyanzeliswa kunye namandla ashiyekileyo emagnethi, bambalwa abantu abaya kuqaphela ukuba umgubo omhlophe obonakala uqhelekile,alumina powder(Al₂O₃), idlala ngokuzolileyo indima "yegorha emva kwezigcawu". Ayinayo i-magnetism, kodwa inokuguqula ukusebenza kwezinto eziphathekayo; ayisiyi-conductive, kodwa inefuthe elinzulu ekuguquleni ukusebenza kakuhle kwangoku. Kwishishini lanamhlanje elilandela iimpawu zokugqibela zamagnetic, igalelo elikhethekileyo le-alumina powder libonakala ngakumbi nangakumbi.
Kubukumkani be-ferrites, "Umda wemilingo wemilingo“
Ukuhamba kwi-workshop enkulu yokuvelisa i-ferrite, umoya ugcwele iphunga elikhethekileyo lobushushu obuphezulu be-sintering. UZhang omdala, ichule elichubekileyo kumatshini wokuvelisa, wayedla ngokuthi: “Kwixesha elidluleyo ukwenza imanganese-zinc ferrite kwakufana neebhanti ezifakwa ngomphunga.” Ukuba ubushushu bebungaphezu kancinane, bekuya kubakho imingxuma ‘ephekiweyo’ ngaphakathi, yaye ilahleko ibingayi kuhla.” Namhlanje, umkhondo we-alumina powder ungeniswe ngokuchanekileyo kwifomula, kwaye imeko ihluke kakhulu.
Indima ephambili ye-alumina powder apha ingabizwa ngokuba "yi-grain boundary engineering": isasazwa ngokulinganayo kwimida phakathi kweengqolowa ze-ferrite. Khawucinge nje ukuba iinkozo ezininzi zilungelelaniswe ngokusondeleyo, kwaye iindawo ezidityanisiweyo zidla ngokuba zezona ndawo zibuthathaka kwizakhiwo zemagnethi kunye “nezona ndawo zinzima” zokulahleka kwemagnethi. I-high-purity, i-ultra-fine powder ye-alumina (ngokuqhelekileyo inqanaba le-submicron) ifakwe kule ndawo yomda weenkozo. Zifana "namadama" amancinci angenakubalwa, athintela ngokufanelekileyo ukukhula okugqithisileyo kweenkozo ngexesha lobushushu obuphezulu be-sintering, okwenza ubukhulu beenkozo buncinci kwaye busasazwe ngokulinganayo.
Kwidabi le-magnetism enzima, yi "uzinziso lwesakhiwo“
Jikela ingqalelo yakho kwihlabathi lemagnethi esisigxina ye-neodymium iron boron (NdFeB) esebenza kakhulu. Esi sixhobo, esibizwa ngokuba “yinkosi yeemagnethi”, sinoxinaniso lwamandla olumangalisayo kwaye ngowona mthombo wamandla ongundoqo wokuqhuba izithuthi zombane zanamhlanje, iiinjini zomoya, kunye nezixhobo zonyango ezichanekileyo. Nangona kunjalo, umceli mngeni omkhulu ulindele: I-NdFeB ithanda ukuba "yi-demagnetization" kumaqondo obushushu aphezulu, kwaye isigaba sayo sangaphakathi esityebileyo se-neodymium sithambile kwaye asinazinzo.
Ngeli xesha, inani lomkhondo we-alumina powder livela kwakhona, lidlala indima ephambili "yesiphuculi sesakhiwo". Ngethuba lenkqubo ye-sintering ye-NdFeB, i-ultrafine alumina powder yaziswa. Ayingeni kwilathisi yesigaba esingundoqo ngobuninzi, kodwa isasazwa ngokukhethiweyo kwimida yeenkozo, ngakumbi ezo ndawo zibuthathaka xa zithelekiswa ne-neodymium-rich.
Phambili kwimagnethi ehlanganisiweyo, "ngumnxibelelanisi onezinto ezininzi"
Ihlabathi lemathiriyeli yemagnethi lisakhula. Ulwakhiwo lwemagnethi oludibeneyo (olufana neHalbach array) oludibanisa ukunyuswa kokuqina kozibuthe kunye nelahleko esezantsi yemathiriyeli yemagnethi ethambileyo (efana nentsimbi yomgubo wentsimbi) kunye nezibonelelo zamandla aphezulu wokunyanzeliswa kwemathiriyeli yemagnethi esisigxina itsala umdla. Kulolu hlobo loyilo lwe-innovative, i-alumina powder ifumene isiteji esitsha.
Xa kuyimfuneko ukudibanisa umgubo wemagnethi weempawu ezahlukeneyo (nangona kunye nomgubo ongasebenziyo wemagnetic) kunye nokulawula ngokuchanekileyo ukugquma kunye namandla omatshini wecandelo lokugqibela, umgubo we-alumina uba yinto efanelekileyo yokugquma i-insulating okanye i-medium yokuzalisa ngokugqwesa kwayo okugqwesileyo, ukunganyaniseki kweekhemikhali kunye nokuhambelana okuhle kunye nezixhobo ezahlukeneyo.
Ukukhanya kwexesha elizayo: kunobuqili ngakumbi kwaye bukrelekrele
Ukusetyenziswa kwealumina powderkwintsimi yeizixhobo zemagnetikusekude ukuphela. Ngokunzulu kophando, izazinzulu zizibophelele ekuphononongeni umgaqo ochuliweyo wesikali:
I-Nano-scale kunye ne-doping echanekileyo: Sebenzisa i-nano-scale i-alumina powder kunye nobukhulu obufanayo kunye nokusasazwa okungcono, kwaye uphonononge indlela echanekileyo yolawulo lwe-magnetic domain pinning kwi-atomic scale.
I-alumina powder, le oxide eqhelekileyo evela emhlabeni, phantsi kokukhanya kobulumko bomntu, yenza umlingo obonakalayo kwihlabathi elingabonakaliyo lamagnetic. Ayivelisi umhlaba wamagnetic, kodwa ivula indlela yosasazo oluzinzileyo nolusebenzayo lwemagnethi; ayiqhubeki ngokuthe ngqo isixhobo, kodwa ifaka amandla anamandla ngakumbi kwizinto ezingundoqo zemagneti zesixhobo sokuqhuba. Kwixesha elizayo lokulandela amandla aluhlaza, umbane osebenzayo kunye nokuqonda okukrelekrele, igalelo elikhethekileyo neliyimfuneko le-alumina powder kwizinto eziphathekayo kuya kuqhubeka nokubonelela ngenkxaso eqinileyo kunye nethe cwaka kuphuhliso lwesayensi kunye nobuchwepheshe. Isikhumbuza ukuba kwi-symphony enkulu ye-symphony yenzululwazi kunye nezobuchwepheshe, amanqaku asisiseko ahlala equlethe amandla anzulu - xa isayensi kunye nobugcisa budibana, izinto eziqhelekileyo ziya kukhanya ngokukhanya okungaqhelekanga.