1. Zoyambira Zamalonda ndi Katundu wa Crystallographic
1.1 Kupanga Magawo ndi Makhalidwe a Polymorphic
(Alumina Ceramic Blocks)
Alumina (Al ₂ O AWIRI), makamaka mu mtundu wake wa α-gawo, ndi imodzi mwa zida zomwe zimagwiritsidwa ntchito kwambiri chifukwa cha mphamvu zake zamakina., inertness mankhwala, ndi chitetezo chamafuta.
Ngakhale kuti aluminiyamu oxide ilipo mu magawo angapo a metastable (c, d, ndi, Bambo), α-alumina ndiye chimango cha crystalline chokhazikika cha thermodynamically pa kutentha, odziwika ndi wandiweyani hexagonal otseka kwambiri (HCP) pulani ya ayoni okosijeni okhala ndi ma aluminiyamu okhala ndi magawo awiri pa atatu a malo ozungulira octahedral.
Izi zidagula chimango, wotchedwa diamondi, imapereka mphamvu ya lattice yayikulu komanso kulumikizana kolimba kwa ionic-covalent, kuchititsa malo osungunuka kwambiri 2054 ° C ndi kukana kusintha kwa gawo pansi pamavuto akulu amafuta.
Kusintha kuchokera ku ma alumina osinthika kupita ku α-Al ₂ O awiri kumachitika nthawi zambiri 1100 ° C ndipo imatsagana ndi kuchepa kwakukulu kwa voliyumu ndi kutayika kwa pamwamba, kupanga kuwongolera gawo kukhala kofunikira panthawi yonse ya sintering.
Ma block a α-alumina apamwamba kwambiri (> 99.5% Al ₂ O ₃) kuwonetsa kuchita bwino kwambiri pamakonzedwe owopsa, pomwe zomanga zapansi (90– 95%) zitha kukhala ndi magawo achiwiri monga mullite kapena magalasi oletsa tirigu kuti agwiritse ntchito.
1.2 Microstructure ndi Mechanical Kuona mtima
Kuchita bwino kwa midadada ya alumina ceramic kumakhudzidwa kwambiri ndi mawonekedwe a microstructural kuphatikiza kukula kwa tirigu, porosity, ndi mgwirizano wa malire a tirigu.
Ma microstructures opangidwa bwino (mlingo wambewu < 5 µm) normally provide greater flexural strength (as much as 400 MPa) and improved fracture toughness contrasted to grainy counterparts, as smaller grains hinder fracture propagation.
Porosity, ngakhale pamilingo yochepetsedwa (1– 5%), amachepetsa kwambiri mphamvu zamakina ndi matenthedwe matenthedwe, amafuna kuchulukira kwathunthu kudzera munjira zothandizidwa ndi kukakamiza monga kukanikiza kutentha kapena kukanikiza kwa isostatic (HIP).
Zosakaniza monga MgO nthawi zambiri zimatulutsidwa motsatira kuchuluka kwake (≈ 0.1 wt%) kulepheretsa kukula kwambewu kwanthawi yayitali pa sintering, kuonetsetsa kukhazikika kwa microstructure ndi dimensional bata.
Zotsatira za midadada ya ceramic imasonyeza kuuma kwakukulu (≈ 1800 HV), wapamwamba kuvala kukana, ndi kuchepetsa kukwawa pamiyendo yokwera kwambiri, kuwapanga kukhala oyenera kunyamula katundu komanso malo ovuta.
2. Njira Zopangira ndi Kukonza
( Alumina Ceramic Blocks)
2.1 Ntchito Yokonzekera Ufa ndi Njira Zopangira
Kupanga midadada ya alumina ceramic kumayamba ndi aluminiyamu yoyera kwambiri yochokera ku calcined bauxite kudzera mu njira ya Bayer kapena yopangidwa ndi mvula kapena njira za sol-gel zoyera kwambiri..
Maufa amapukutidwa kuti akwaniritse kugawa kwapang'ono pang'ono, kukulitsa kachulukidwe kazonyamula ndi sinterability.
Kupanga ma geometries pafupi-net kumatsirizidwa ndi njira zosiyanasiyana zopangira: kukanikiza kwa uniaxial kwa midadada yowongoka, kukakamiza kwa isostatic kwa kachulukidwe kofanana mumitundu yovuta, extrusion kwa madera yaitali, ndi slide casting kwa zigawo zovuta kapena zazikulu.
Njira iliyonse imakhudza kachulukidwe ka thupi lobiriwira ndi homogeneity, zomwe zimakhudza mowongoka nyumba zomaliza pambuyo pa sintering.
Kwa ntchito zapamwamba kwambiri, mapangidwe apamwamba monga kuponya tepi kapena kuponyera gel osakaniza angagwiritsidwe ntchito kukwaniritsa premium dimensional control ndi microstructural harmony..
2.2 Sintering ndi Post-Processing
Sintering mu mpweya pa milingo kutentha pakati 1600 °C ndi 1750 ° C imalola kufalikira koyendetsedwa ndi kufalikira, kumene khosi limakula ndipo pores amachepa, kuchititsa thupi lakuda kwambiri la ceramic.
Kuwongolera kozungulira komanso mbiri yeniyeni yamafuta ndikofunikira kuti mupewe kutupa, kulimbana, kapena kusiyana kosiyana.
Njira za post-sintering zimaphatikizapo kugaya diamondi, kugona, ndi kupukuta kuti akwaniritse kulolerana kolimba ndi zokutira zosalala zomwe zimafunika kuti zitetezedwe, kuuluka, kapena optical ntchito.
Kuchepetsa kwa laser ndi makina a waterjet amalola kusinthika kolondola kwa block geometry popanda kuyambitsa kupsinjika kwamafuta ndi nkhawa.
Chithandizo chapamtunda monga zokutira za alumina kapena kuwaza kwa plasma kumatha kulimbikitsanso kuvala kapena kukana dzimbiri muzochitika zapadera zantchito..
3. Katundu Wothandiza ndi Magwiridwe Antchito
3.1 Zizolowezi Zotentha ndi Zamagetsi
Mipiringidzo ya aluminiyamu ya ceramic imawonetsa kutenthetsa kwapakati (20– 35 W/(m · k)), okwera kwambiri kuposa ma polima ndi magalasi, kupangitsa kuti zikhale zotheka kutaya kutentha kodalirika mumagetsi ndi machitidwe oyendetsera kutentha.
Amasunga kukhulupirika kwachimake monga momwe 1600 ° C mu oxidizing ambiences, ndi kukula kochepa kwa kutentha (≈ 8 ppm/k), kuwonjezera pa kutentha kwakukulu kwa kutentha pamene kupangidwa bwino.
Awo mkulu mphamvu resistivity (> 10 ¹⁴ Ω · cm) ndi dielectric stamina (> 15 kV/mm) apangeni ma insulators abwino kwambiri amagetsi pamagetsi apamwamba kwambiri, opangidwa ndi kufalitsa mphamvu, switchgear, ndi vacuum systems.
Dielectric mosasinthasintha (≈ 9– 10) imakhalabe yokhazikika pamitundu yayikulu yokhazikika, kugwiritsa ntchito RF ndi ma microwave.
Nyumbazi zimalola kuti midadada ya aluminiyamu igwire ntchito modalirika m'malo omwe zinthu zachilengedwe zingawonongeke kapena kusiya kugwira ntchito.
3.2 Chemical ndi Ecological Resilience
Chimodzi mwazinthu zopindulitsa kwambiri za midadada ya alumina ndikukana kwawo kodabwitsa kugunda kwamankhwala.
Amakhala ndi ma acid ambiri (kupatulapo hydrofluoric ndi kutentha kwa phosphoric acid), alkalis (ndi zosungunuka zina mu caustics amphamvu pa kutentha okwera), ndi mchere wosungunuka, kuwapanga kukhala abwino pokonza mankhwala, kupanga semiconductor, ndi zida zowongolera kuwononga chilengedwe.
Zochita zawo zosanyowetsa ndi zitsulo zambiri zosungunuka ndi slags zimalola kugwiritsidwa ntchito muzitsulo, masamba a thermocouple, ndi zomangira za ng'anjo.
Kuphatikiza apo, aluminiyamu si poizoni, biocompatible, ndi zosagwira ma radiation, kuwonjezera mphamvu zake mu implants zachipatala, chitetezo cha nyukiliya, ndi mbali zakuthambo.
Kutulutsa mpweya pang'ono m'malo otsuka mpweya kumapangitsa kuti pakhale vacuum yokwera kwambiri. (UHV) machitidwe ophunzirira ndi kupanga semiconductor.
4. Ntchito Zamakampani ndi Kuphatikizana Kwaukadaulo
4.1 Zida Zomanga ndi Zosavala
Ma block a aluminiyamu a ceramic amakhala ngati zinthu zofunika kuvala m'magawo osiyanasiyana kuyambira pakuchotsa mpaka kupanga mapepala.
Amagwiritsidwa ntchito ngati zomangira m'machuti, zotengera, ndi mphepo yamkuntho kuti athe kupirira abrasion kuchokera ku slurries, ufa, ndi mankhwala granular, kutalikitsa moyo wautali kwambiri poyerekeza ndi chitsulo.
Mu makina zidindo ndi mayendedwe, zopinga za aluminiyamu zimachepetsa kusisita, kuuma kwakukulu, ndi kukana dzimbiri, kuchepetsa nthawi yosamalira komanso yopuma.
Mipiringidzo yopangidwa mwamakonda imaphatikizidwa ndi zida zochepetsera, amafa, ndi ma nozzles omwe chitetezo cham'mbali ndi kusunga mbali ndizofunikira kwambiri.
Chikhalidwe chawo chopepuka (makulidwe ≈ 3.9 g/cm ZISANU) zimathandiziranso kupulumutsa mphamvu zamagetsi pakusamutsa zigawo.
4.2 Kupanga Kwapamwamba ndi Kutuluka Kumagwiritsira Ntchito
Kuposa maudindo ofanana, zitsulo za alumina zimagwiritsidwa ntchito pang'onopang'ono pamakina apamwamba aukadaulo.
Mu zipangizo zamagetsi, amagwira ntchito ngati zotetezera, kutentha kumamira, ndi laser dental caries zinthu chifukwa cha nyumba zawo zotentha ndi dielectric.
Mu machitidwe a mphamvu, amakhala olimba oxide mafuta selo (SOFC) magawo, olekanitsa batire, ndi zida zophatikizira zoyang'ana m'plasma.
Kupanga kowonjezera kwa aluminiyamu pogwiritsa ntchito ma jetting kapena stereolithography kukubwera, kupangitsa kuti zikhale zovuta kupanga ma geometries omwe kale anali osatheka ndi mapangidwe achikhalidwe.
Zomangamanga zophatikizira alumina ndi zitsulo kapena ma polima kudzera pa brazing kapena kuwombera limodzi zikukhazikitsidwa kuti zizigwira ntchito zambiri muzamlengalenga ndi chitetezo..
Monga zinthu zasayansi kafukufuku kupita patsogolo, midadada ya aluminiyamu ya ceramic ikupitilizabe kupita patsogolo kuchokera kumapangidwe osakhazikika mpaka kukhala zinthu zogwira ntchito kwambiri, mayankho okhalitsa a uinjiniya.
Powombetsa mkota, zitsulo za alumina ceramic zimayimira kalasi yoyambira yazambiri zapamwamba, kuphatikiza mphamvu zamakina okhazikika ndi phenomenal chemical komanso chitetezo chamafuta.
Kuthekera kwawo kudutsa mafakitale, zamagetsi, ndi madera asayansi amawunikira kufunika kwawo kosatha pakupanga kwamasiku ano komanso kukula kwaukadaulo wamakono.
5. Wofalitsa
Malingaliro a kampani Alumina Technology Co., Ltd., Ltd imayang'ana kwambiri pa kafukufuku ndi chitukuko, kupanga ndi kugulitsa ufa wa aluminium oxide, zinthu za aluminium oxide, aluminium oxide crucible, ndi zina., kutumikira zamagetsi, za ceramic, mankhwala ndi mafakitale ena. Kuyambira kukhazikitsidwa kwake mu 2005, kampaniyo yadzipereka kupereka makasitomala zinthu zabwino kwambiri ndi ntchito. Ngati mukuyang'ana zapamwamba aluminiyamu al2o3, chonde omasuka kulankhula nafe.
Tags: Alumina Ceramic Blocks, Alumina Ceramics, aluminiyamu
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