Alumina ceramics tau muab faib ua 99 alumina, 96 alumina, 95 alumina, 90 alumina, 85 alumina thiab lwm yam ntxiv raws li cov ntsiab lus ntawm Al2O3. Qee lub sij hawm cov uas muaj Al2O3 ntsiab lus ntawm 80% lossis 75% kuj tseem cais raws li dog dig alumina ceramic series. Ntawm lawv, 99 alumina ceramic yog siv los ua cov phaj siab siab, lub tshuab hluav taws xob refractory lub rhawv thiab cov ntaub ntawv hnav tshwj xeeb, xws li cov kabmob ceramic, cov ntsaws ruaj ruaj ceramic thiab cov dej ua kua dej valve; 95 alumina ceramic yog tsuas yog siv ua xeb thiab hnav-resistant qhov chaw; raws li ib feem ntawm talc feem ntau xyaw, cov khoom siv hluav taws xob thiab lub zog ntawm 85 alumina ceramic tau zoo dua, thiab nws tuaj yeem kaw nrog molybdenum, niobium, tantalum thiab lwm yam hlau, thiab qee qhov siv los ua hluav taws xob lub tshuab nqus tsev. Ua li cas alumina ceramic khoom ua? Nws feem ntau suav nrog plaub hauv qab no.
1. Hmoov Npaj
Lub alumina hmoov yog npaj rau hauv cov hmoov cov khoom raws li cov khoom sib txawv thiab cov txheej txheem molding sib txawv. Lub particle loj ntawm hmoov yog hauv qab 1ym. Yog tias cov khoom lag luam siab-alumina ceramic tsim cov khoom lag luam, ntxiv rau alumina purity ntawm 99.99%, ultra-nplua pulverization thiab uniform particle loj faib yuav tsum. Thaum extrusion molding lossis txhaj tshuaj molding yog siv, phau ntawv qhia thiab yas yuav tsum tau qhia rau hauv cov hmoov, feem ntau thermoplastic yas lossis resin nrog qhov hnyav ntawm 10-30%. Cov kab ntawv organic yuav tsum nyob rau ntawm 150-200 ° C nrog rau alumina hmoov tshuaj sib xyaw ua ke kom thiaj li pab tswj kev lag luam molding. Yog tias semi-automatic lossis tag nrho tsis siv neeg qhuav nias siv, muaj qhov tshwj xeeb cov txheej txheem rau cov hmoov, thiab cov hmoov yuav tsum tau ua tiav los ntawm cov tshuaj tsuag granulation ua kom nws kheej kheej, thiaj li txhawm rau txhim kho cov npliag ntawm cov hmoov thiab ua kom zoo li tsis siv neeg puv. ntawm lub pwm thaum lub sij hawm txhaj tshuaj molding. Tsis tas li ntawd, txhawm rau txo qis kev sib txhuam ntawm cov hmoov thiab pwm phab ntsa, nws yog ib qhov tsim nyog yuav tsum ntxiv 1-2% roj nplua nyeem (xws li stearic acid) thiab phau ntawv tiv thaiv PVA.
2. Moulding thiab Nias
Cov txheej txheem molding ntawm alumina ceramic khoom muaj xws li qhuav nias, npleem casting, extrusion, txias isostatic nias, txhaj tshuaj thiab lwm txoj kev. Cov khoom lag luam sib txawv, qhov ntau thiab tsawg, cov duab sib txawv thiab cov khoom tsis sib xws yuav tsum muaj cov qauv sib txawv. Hauv qab no yog cov lus qhia ntawm cov feem ntau siv tshuaj molding.
● Cov Nias Kom Zoo: Cov ntawv txhuas aluminium oxide ceramic qhuav nias thev naus laus zis tsuas yog txwv rau cov khoom nrog cov duab yooj yim thiab sab hauv phab ntsa tuab tshaj li 1 hli, thiab qhov sib piv ntawm qhov ntev mus rau taub tsis tshaj 4: 1. Cov qauv txheej txheem yog uniaxial lossis bidirectional. Muaj ob hom kev nias: hydraulic thiab siv tshuab, thiab tuaj yeem yog semi-automatic lossis tag nrho tsis siv neeg. Qhov siab tshaj plaws ntawm xovxwm yog 200MPa. Cov zis tuaj yeem ncav cuag 15-50 daim ib feeb. Vim tias lub teeb tsa ntawm qhov tsis sib xws ntawm qhov xovxwm, qhov siab ntawm qhov seem raug sib txawv thaum cov hmoov sau tau sib txawv. Txawm li cas los xij, lub siab thov los ntawm cov tshuab hloov pauv hloov nrog qhov ntau ntawm cov hmoov puv, uas yooj yim ua rau qhov sib txawv ntawm qhov loj me me tom qab kev ua txhaum, uas cuam tshuam rau cov khoom lag luam zoo. Yog li, qhov teeb tsa zoo li qub ntawm cov hmoov txhawm rau lub sij hawm qhuav nias tseem ceeb heev rau kev txhaj tshuaj pwm. Txawm hais tias cov nyiaj kom puv yog qhov tseeb lossis tsis muaj qhov cuam tshuam loj ntawm kev ntsuas qhov tseeb ntawm cov khoom lag luam alumina ceramic feem. Cov hmoov sib xyaw loj dua 60 μm thiab nruab nrab ntawm 60-200 mesh tuaj yeem tau txais cov txiaj ntsig ntws tawm qhov siab tshaj plaws thiab ua tiav qhov ua tau zoo tshaj qhov siab.
Casting Kev Tuav Zaj Hlau: txoj kev no yog qhov ntxov tshaj plaws molding txheej txheem siv rau alumina ceramics. Vim tias siv cov pwm ua tshuab pwm, tus nqi qis thiab nws yooj yim los ua qhov loj-qhov loj thiab qhov loj-seem. Tus yuam sij rau npleem casting yog npaj ntawm alumina slurry. Feem ntau dej siv raws li qhov nruab nrab flux, thiab tom qab ntawd tus neeg sawv cev thiab tus neeg sawv cev ntxiv, thiab cov roj tawm tom qab tau tiav rau hauv av, thiab tom qab ntawd muab nchuav rau hauv lub puab pwm. Vim tias qhov nqus dej los ntawm capillary ntawm lub plaster pwm, cov slurry solidifies hauv pwm. Thaum hollow slip cating, thaum lub pwm phab ntsa nqus lub slurry mus rau qhov xav tau tuab, qhov tshaj slurry xav tau nchuav tawm. Txhawm rau kom txo lub shrinkage ntawm lub cev ntsuab, yuav tsum siv cov nplauv ntau ntau li ntau tau.
3. Kev ntsuas kub siab Sintering
Cov txheej txheem thev naus laus zis ntawm densifying granular ceramic lub cev thiab tsim cov khoom tawv yog hu ua sintering. Sintering yog ib txoj hauv kev los tshem tawm cov voids ntawm cov lus hauv lub cev ntsuab, tshem tawm ib qho me me ntawm cov roj thiab lub cev tsis huv cov organic, kom cov hais me me tuaj yeem loj hlob thiab sib txuas ua ke los tsim cov tshuaj tshiab. Cov khoom siv cua sov siv rau kev tua hluav taws yog qhov cub siv hluav taws xob feem ntau. Qhov ntsuas kub ntawm qhov ntsuas sintering txawv raws qhov purity ntawm alumina, thiab nws feem ntau yog 1,000-1,800 degrees Celsius.
4. Sib tsoo thiab Machining
Qee cov ntaub ntawv alumina ceramic tseem yuav tsum tau ua tiav tom qab sintering. Piv txwv li, cov khoom lag luam uas tuaj yeem siv los ua cov pob txha tsim hluav taws xob yuav tsum ua kom tiav qhov chaw siab, zoo li daim iav saum npoo av, kom muaj kev ntub dej. Vim tias lub siab hard ntawm alumina ceramic khoom, nws yog qhov tsim nyog los siv kev sib tsoo nyuaj thiab polishing cov ntaub ntawv tiav rau xov. Xws li SiC, B4C lossis pob zeb diamond thiab lwm yam. Feem ntau siv ntxhib los txhuam kom zoo rau txhuam cov kauj ruam ntawm kauj ruam, thiab thaum kawg nto rau polished. Feem ntau, Al2O3 micropowder lossis pob zeb diamond muab tshuaj ntawm< 1ym="" tuaj="" yeem="" siv="" rau="" kev="" sib="" tsoo="" thiab="" polishing.="" ntxiv="" rau,="" laser="" ua="" thiab="" ua="" ultrasonic,="" sib="" tsoo="" thiab="" polishing="" txoj="" kev="" kuj="" tseem="" siv="">
