Kev taw qhia luv luv ntawm alumina ceramic txheej txheem

Ntawm lawv, 99 alumina porcelain cov ntaub ntawv yog siv los ua kom kub kub crucible, lub cub tawg thiab cov khoom siv tshwj xeeb hnav-resistant, xws li ceramic bearings, ceramic seals thiab dej li qub, thiab lwm yam. 95 alumina porcelain feem ntau yog siv los ua corrosion-resistant thiab hnav- resistant qhov chaw; Cov khoom siv hluav taws xob thiab cov khoom siv dag zog ntawm 85 porcelain tau txhim kho vim qhov sib ntxiv ntawm talc, uas tuaj yeem raug kaw nrog molybdenum, niobium, tantalum thiab lwm yam hlau, thiab qee qhov ntawm lawv yog siv los ua cov khoom siv hluav taws xob. Nws cov txheej txheem ntau lawm yog raws li nram no:

Ib, hmoov npaj:

Cov hmoov alumina tau npaj rau hauv cov khoom siv hmoov raws li cov khoom sib txawv thiab cov txheej txheem molding sib txawv. Hmoov loj hauv 1μm? Micron? Hauv qab no, yog tias tsim cov khoom lag luam siab purity alumina ceramic ntxiv rau alumina purity nyob rau hauv 99.99 feem pua, tab sis kuj yuav tsum tau ultrafine sib tsoo thiab ua rau nws cov particle loj faib uniform. Thaum siv extrusion lossis txhaj tshuaj molding, binder thiab yas tus neeg sawv cev yuav tsum tau nkag mus rau hauv cov hmoov. Thermoplastic lossis resin nrog qhov hnyav piv ntawm 10-30 feem pua ​​? Cov organic binder yuav tsum tau tov nrog alumina hmoov ntawm 150-200 degree los pab txhawb kev ua haujlwm molding. Cov ntaub ntawv hmoov tsim los ntawm cov txheej txheem kub nias tsis tas yuav ntxiv cov ntawv khi. Yog tias siv semi-automatic lossis tsis siv neeg qhuav nias molding, muaj cov kev cai tshwj xeeb rau cov hmoov, yuav tsum tau siv cov tshuaj tsuag granulation txoj kev kho cov hmoov, ua kom nws zoo li spherical, txhawm rau txhim kho fluidity ntawm cov hmoov los pab txhawb. tsis siv neeg filling pwm phab ntsa molding. Tsis tas li ntawd, txhawm rau txo qhov kev sib txhuam ntawm cov hmoov thiab cov phab ntsa tuag, nws yuav tsum tau ntxiv 1 ~ 2 feem pua ​​​​lubricant. Zoo li stearic acid? Thiab binder PVA.

Yuav kom qhuav nias molding, tshuaj tsuag granulation ntawm cov hmoov yog yuav tsum tau, nyob rau hauv uas polyvinyl cawv yog qhia raws li binder. Nyob rau hauv xyoo tas los no, ib lub koom haum tshawb fawb hauv Shanghai tau tsim cov dej-soluble paraffin ua cov ntawv khi rau cov tshuaj tsuag granulation ntawm Al2O3, uas muaj cov dej zoo hauv qab cua sov. Cov hmoov tom qab tshuaj tsuag granulation yuav tsum muaj fluidity zoo, xoob ntom thiab kev sib txhuam kub ntawm lub kaum sab xis qis dua 30 degree. Txhawm rau kom tau txais cov xim ntsuab ntau dua, qhov sib piv me me yog qhov zoo tagnrho.

Thib ob, txoj kev tsim:

Cov txheej txheem molding ntawm alumina ceramic khoom suav nrog qhuav nias, grouting, extrusion, txias isostatic nias, txhaj tshuaj, ntws casting, kub nias thiab kub isostatic nias. Nyob rau hauv xyoo tas los no nyob rau hauv tsev thiab txawv teb chaws kuj tsim siab lim molding, ncaj qha solidification txhaj molding, gel txhaj molding, centrifugal txhaj molding thiab khoom dawb molding tshuab txoj kev. Cov duab sib txawv, qhov ntau thiab tsawg, cov duab sib txawv thiab qhov tseeb ntawm cov khoom xav tau kev sib txawv molding. Abstract nws common molding taw qhia:

1, qhuav nias molding: alumina ceramic qhuav nias molding tshuab yog txwv rau cov duab yooj yim thiab phab ntsa tuab ntawm ntau tshaj 1 hli, qhov ntev thiab txoj kab uas hla tsis ntau dua 4∶1 khoom. Txoj kev tsim muaj uniaxial lossis bidirectional. Cov xovxwm muaj hydraulic, mechanical ob yam, tuaj yeem ua semi-automatic lossis tsis siv neeg molding. Qhov siab tshaj plaws ntawm cov xovxwm yog 200Mpa. Cov zis tuaj yeem ncav cuag 15 ~ 50 daim ib feeb. Vim tias lub siab tsis sib xws ntawm cov xovxwm hydraulic, qhov siab ntawm qhov nias yog qhov sib txawv thaum cov hmoov filling txawv. Txawm li cas los xij, lub siab siv los ntawm cov tshuab xovxwm sib txawv nrog cov hmoov txhaws, uas yuav yooj yim ua rau qhov sib txawv me me shrinkage tom qab sintering thiab cuam tshuam rau cov khoom zoo. Yog li ntawd, kev sib faib ntawm cov hmoov hmoov nyob rau hauv qhuav nias txheej txheem yog ib qho tseem ceeb heev rau pwm filling. Txawm hais tias qhov ntim ntau yog qhov tseeb lossis tsis muaj kev cuam tshuam zoo rau qhov kev tswj xyuas qhov tseeb ntawm cov khoom siv alumina ceramic. Qhov siab tshaj plaws pub dawb ntws tuaj yeem tau txais thaum cov hmoov hmoov loj dua 60μm thiab nruab nrab ntawm 60 ~ 200 mesh, thiab qhov zoo tshaj plaws kev ua haujlwm siab tuaj yeem tau txais.

2, grouting molding txoj kev: grouting molding yog qhov ntxov tshaj plaws ntawm alumina ceramics molding txoj kev. Vim yog kev siv gypsum pwm, tus nqi qis thiab yooj yim rau cov duab loj loj, cov tsos ntawm cov khoom seem. Qhov tseem ceeb ntawm grouting molding yog kev npaj ntawm alumina slurry. Feem ntau nrog dej raws li qhov nruab nrab flux, thiab tom qab ntawd ntxiv cov kua nplaum dissolving tus neeg sawv cev thiab khi, tag nrho tom qab sib tsoo tawm, thiab tom qab ntawd nchuav rau hauv plaster pwm. Vim lub adsorption ntawm dej los ntawm lub capillary ntawm gypsum pwm, lub slurry yog solidified nyob rau hauv pwm. Hollow grouting, nyob rau hauv pwm phab ntsa adsorption slurry thickness mus txog rau qhov yuav tsum tau, tab sis kuj yuav tsum tau ncuav tawm cov slurry tshaj. Txhawm rau kom txo qis qis ntawm lub cev, kev siv cov slurry siab yuav tsum tau siv kom deb li deb tau.

Organic additives yuav tsum tau ntxiv rau alumina ceramic slurry los tsim ib txheej hluav taws xob ob npaug rau saum npoo ntawm slurry hais kom cov slurry tuaj yeem raug tshem tawm ruaj khov yam tsis muaj nag lossis daus. Tsis tas li ntawd, nws yuav tsum tau ntxiv vinyl cawv, methyl cellulose, alginate amine thiab lwm yam binder thiab polypropylene amine, Arabic cov pos hniav thiab lwm yam dispersants, lub hom phiaj yog ua kom lub slurry haum rau grouting molding lag luam.

Peb, firing technology:

Cov txheej txheem kev densifying granular ceramic lub cev thiab tsim cov khoom siv hu ua sintering. Sintering yog txoj kev tshem tawm cov void ntawm cov khoom nyob rau hauv lub cev ntawm lub billet, tshem tawm ib tug me me ntawm cov pa roj thiab impurities los ntawm cov organic teeb meem, thiaj li hais tias cov hais loj hlob ua ke thiab tsim cov khoom tshiab.

Cov khoom siv cua sov siv rau kev tua hluav taws yog qhov siv hluav taws xob ntau tshaj plaws. Ntxiv rau atmospheric sintering? Qhov ntawd yog, xovxwm-dawb sintering? Sab nraud, muaj kub nias thiab kub isostatic nias sintering. Kev kub ceev nruam nce ntau lawm, tab sis tus nqi ntawm cov khoom siv thiab pwm yog siab dhau, thiab qhov ntev ntawm cov khoom raug txwv vim yog cua sov axial. Kub isostatic siab sintering txais kev kub siab thiab siab siab roj raws li kev hloov pauv nruab nrab, uas muaj qhov zoo ntawm cov cua sov hauv txhua qhov kev qhia thiab tsim nyog rau sintering ntawm cov khoom nyuaj. Vim tias cov qauv tsis sib xws, cov khoom ntawm cov khoom yog nce los ntawm 30 ~ 50 feem pua ​​​​piv nrog txias nias sintering. 10 ~ 15 feem pua ​​​​siab dua li qub kub nias sintering. Yog li ntawd, tam sim no, qee cov khoom muaj nqis ntxiv alumina ceramic lossis cov khoom tshwj xeeb uas xav tau los ntawm lub teb chaws tiv thaiv tub rog kev lag luam, xws li ceramic bearings, iav, nuclear roj thiab phom phom khoom, teb siv kub isostatic siab firing txoj kev.

Tsis tas li ntawd, microwave sintering, arc plasma sintering thiab nws tus kheej-propagating sintering kuj nyob rau hauv txoj kev loj hlob.

Plaub, txheej txheem tiav thiab ntim khoom:

Qee cov ntaub ntawv alumina ceramic yuav tsum tau ua tiav tom qab sintering. Xws li tuaj yeem siv los ua cov khoom siv pob txha pob txha yuav tsum tau ua kom tiav qhov siab, xws li daim iav, kom lubricity nce. Vim tias cov khoom siv alumina ceramic ntau dua hardness, nws yog ib qho tsim nyog yuav tsum siv cov khoom sib tsoo nyuaj thiab polishing cib rau kev ua tiav. Xws li SiC, B4C lossis Pob Zeb Diamond, thiab lwm yam. Qhov kawg nto polishing feem ntau yog ua los ntawm kev sib tsoo los ntawm ntxhib mus rau nplua abrasives. Feem ntau, <1μm? micron?="" al2o3="" hmoov="" los="" yog="" pob="" zeb="" diamond="" muab="" tshuaj="" txhuam="" rau="" kev="" sib="" tsoo="" thiab="" polishing.="" tsis="" tas="" li="" ntawd,="" laser="" ua="" thiab="" ultrasonic="" kev="" sib="" tsoo="" thiab="" polishing="" txoj="" kev="" kuj="" yuav="" siv="">

Qee qhov alumina ceramic yuav tsum tau ntim nrog lwm cov ntaub ntawv.