Kuwulula mawonekedwe apadera komanso chiyembekezo chogwiritsa ntchito green silicon carbide micropowder
M'munda wamasiku ano waukadaulo wapamwamba, green silicon carbide micropowder pang'onopang'ono ikuyamba kuyang'ana kwambiri gulu lazasayansi lazinthu ndi mawonekedwe ake apadera akuthupi ndi mankhwala. Gululi lopangidwa ndi zinthu za kaboni ndi silicon zawonetsa mwayi wogwiritsa ntchito m'mafakitale ambiri chifukwa cha mawonekedwe ake apadera a kristalo komanso magwiridwe antchito abwino kwambiri. Nkhaniyi iwunika mozama zapadera za green silicon carbide micropowder ndi kuthekera kwake kogwiritsa ntchito magawo osiyanasiyana.
1. Basic makhalidwe a green silicon carbide micropowder
Green silicon carbide (SiC) ndi chinthu chopangidwa molimba kwambiri ndipo ndi cha covalent bond pawiri. Kapangidwe kake ka kristalo kamakhala ndi hexagonal system yokhala ngati diamondi. Green silicon carbide micropowder nthawi zambiri imatanthawuza zinthu zopangidwa ndi ufa zokhala ndi tinthu tating'onoting'ono tosiyanasiyana ta 0.1-100 ma microns, ndipo mtundu wake umapereka ma toni osiyanasiyana kuyambira wobiriwira wobiriwira mpaka wobiriwira wakuda chifukwa cha kuyera kosiyana ndi zonyansa.
Kuchokera pamapangidwe ang'onoang'ono, atomu iliyonse ya silicon mu kristalo wobiriwira wa silicon carbide imapanga kulumikizana kwa tetrahedral ndi maatomu anayi a kaboni. Chomangira cholimba cha covalent chimapereka zinthuzo kuuma kwambiri komanso kukhazikika kwamankhwala. Ndikoyenera kudziwa kuti kuuma kwa Mohs kwa silicon carbide yobiriwira kumafika 9.2-9.3, yachiwiri kwa diamondi ndi kiyubiki boron nitride, zomwe zimapangitsa kuti zisalowe m'malo mwa abrasives.
2. Zapadera za green silicon carbide micropowder
1. Wabwino makina katundu
Chodziwika kwambiri cha green silicon carbide micropowder ndi kuuma kwake kwambiri. Kulimba kwake kwa Vickers kumatha kufika 2800-3300kg/mm², zomwe zimapangitsa kuti ziziyenda bwino pokonza zinthu zolimba. Nthawi yomweyo, green silicon carbide imakhalanso ndi mphamvu yabwino yopondereza ndipo imatha kukhalabe ndi mphamvu zamakina pa kutentha kwambiri. Izi zimapangitsa kuti zitheke kugwiritsidwa ntchito m'malo ovuta kwambiri.
2. Wabwino matenthedwe katundu
Thermal conductivity ya green silicon carbide ndi yokwera ngati 120-200W/(m·K), yomwe ndi 3-5 kuwirikiza chitsulo wamba. Kutentha kwapamwamba kumeneku kumapangitsa kukhala chinthu chabwino kwambiri chochotsera kutentha. Chomwe chiri chodabwitsa kwambiri ndi chakuti mphamvu yowonjezera kutentha ya green silicon carbide ndi 4.0 × 10⁻⁶/℃ yokha, kutanthauza kuti imakhala ndi kukhazikika kwapamwamba kwambiri pamene kutentha kumasintha, ndipo sikudzatulutsa maonekedwe oonekera chifukwa cha kuwonjezereka kwa kutentha ndi kutsika.
3. Kukhazikika kwapadera kwamankhwala
Pankhani ya mankhwala, green silicon carbide imawonetsa inertness yamphamvu kwambiri. Ikhoza kukana dzimbiri za ma asidi ambiri, alkalis ndi mchere, ndipo imatha kukhala yokhazikika ngakhale kutentha kwambiri. Zoyeserera zikuwonetsa kuti silicon carbide yobiriwira imatha kukhalabe yokhazikika m'malo okhala ndi okosijeni pansi pa 1000 ℃, zomwe zimapangitsa kuti zitha kugwiritsidwa ntchito kwanthawi yayitali m'malo owononga.
4. Zapadera zamagetsi
Green silikoni carbide ndi lonse bandgap semiconductor chuma ndi bandgap m'lifupi mwake 3.0eV, amene ndi yaikulu kwambiri kuposa 1.1eV silikoni. Mbali imeneyi imathandiza kupirira ma voltages apamwamba ndi kutentha, ndipo ili ndi ubwino wapadera pazida zamagetsi zamagetsi. Kuphatikiza apo, silicon carbide yobiriwira imakhalanso ndi kayendedwe ka ma elekitironi, zomwe zimapangitsa kuti pakhale zida zapamwamba kwambiri.
3. Kukonzekera ndondomeko ya green silicon carbide micropowder
Kukonzekera kwa green silicon carbide micropowder makamaka kumatenga njira ya Acheson. Njirayi imasakaniza mchenga wa quartz ndi petroleum coke mu gawo lina ndikuwotcha mpaka 2000-2500 ℃ mu ng'anjo yolimbana nayo. The blocky green silicon carbide wopangidwa ndi momwe amachitira amakumana ndi njira monga kuphwanya, kusanja, ndi pickling kuti pamapeto pake apeze zinthu za micropowder zamitundu yosiyanasiyana.
M'zaka zaposachedwapa, ndi kupita patsogolo kwa teknoloji, njira zatsopano zokonzekera zatulukira. Chemical vapor deposition (CVD) ikhoza kukonzekera chiyero chapamwamba cha nano-scale green silicon carbide powder; njira Sol-gel osakaniza akhoza molondola kulamulira tinthu kukula ndi morphology ufa; njira ya plasma imatha kupanga mosalekeza ndikuwongolera kupanga bwino. Njira zatsopanozi zimapereka mwayi wowonjezereka wa kukhathamiritsa kwa magwiridwe antchito komanso kukulitsa ntchito ya green silicon carbide micropowder.
4. Main ntchito madera obiriwira pakachitsulo carbide micropowder
1. Kupera kolondola ndi kupukuta
Monga superhard abrasive, green silicon carbide micropowder imagwiritsidwa ntchito kwambiri pakukonza bwino kwa simenti ya carbide, zoumba, galasi ndi zida zina. M'makampani a semiconductor, ufa wobiriwira wobiriwira wa silicon carbide umagwiritsidwa ntchito popukuta zitsulo zopyapyala za silicon, ndipo ntchito yake yodulira ndi yabwino kuposa yamtundu wa aluminiyamu. M'munda wa optical component processing, wobiriwira silicon carbide ufa akhoza kukwaniritsa nano-scale pamwamba roughness ndi kukwaniritsa zofunika processing wa mkulu-mwatsatanetsatane kuwala zigawo zikuluzikulu.
2. Zida zamakono za ceramic
Green silicon carbide powder ndi chinthu chofunikira kwambiri pokonzekera zoumba zapamwamba kwambiri. Zomangamanga za ceramic zokhala ndi zida zabwino kwambiri zamakina komanso kukhazikika kwamafuta zimatha kupangidwa kudzera pakuwotcha kotentha kapena njira zochitira sintering. Mtundu uwu wa zinthu za ceramic zimagwiritsidwa ntchito kwambiri pazinthu zazikulu monga zisindikizo zamakina, mayendedwe, ndi ma nozzles, makamaka m'malo ovuta kugwira ntchito monga kutentha kwambiri ndi dzimbiri.
3. Zipangizo zamagetsi ndi semiconductor
M'munda wa zamagetsi, wobiriwira silicon carbide ufa ntchito pokonzekera lonse bandgap semiconductor zipangizo. Zipangizo zamagetsi zochokera ku green silicon carbide zimakhala ndi mawonekedwe apamwamba, okwera kwambiri, komanso kutentha kwambiri, ndipo zimasonyeza kuthekera kwakukulu mu magalimoto atsopano amphamvu, ma grids anzeru ndi madera ena. Kafukufuku wawonetsa kuti zida zobiriwira za silicon carbide zimatha kuchepetsa kutayika kwa mphamvu ndi 50% poyerekeza ndi zida zachikhalidwe za silicon.
4. Kulimbitsa kophatikizana
Kuwonjezera wobiriwira silicon carbide ufa monga kulimbikitsa zitsulo kapena polima matrix akhoza kwambiri kupititsa patsogolo mphamvu, kuuma ndi kuvala kukana kwa zinthu zophatikizika. M'munda wamlengalenga, ma aluminium-based silicon carbide composites amagwiritsidwa ntchito popanga magawo opepuka komanso amphamvu kwambiri; m'makampani amagalimoto, silicon carbide reinforced brake pads kuwonetsa kukana kutentha kwambiri.
5. Zida zokanira ndi zokutira
Pogwiritsa ntchito kukhazikika kwapamwamba kwa silicon carbide yobiriwira, zida zokanira zowoneka bwino zimatha kukonzekera. M'makampani osungunula zitsulo, njerwa za silicon carbide refractory zimagwiritsidwa ntchito kwambiri pazida zotentha kwambiri monga ng'anjo zophulika ndi zosinthira. Kuphatikiza apo, zokutira za silicon carbide zimatha kupereka chitetezo chabwino kwambiri komanso dzimbiri pazinthu zoyambira, ndipo zimagwiritsidwa ntchito pazida zamankhwala, masamba a turbine ndi magawo ena.