Cuaj qhov precision molding cov txheej txheem ntawm zirconia ceramics

Cuaj qhov precision molding cov txheej txheem ntawm zirconia ceramics
Cov txheej txheem moulding ua lub luag haujlwm txuas rau tag nrho cov txheej txheem ntawm cov ntaub ntawv sib tseem ceeb ntawm covermic, thiab yog tus yuam sij los txhim kho kev ntseeg tau thiab ntau lawm Resininability thiab ntau lawm Resebinability thiab ntau lawm Resinability ntawm cov khoom siv ceramic thiab cov khoom sib xyaw.
Nrog rau kev txhim kho ntawm tib neeg, cov txheej txheem kev ua log, log nruj, thiab lwm yam. ZO2 Cov ntaub ntawv zoo ntawm cov khoom siv sib xyaw ua ke hauv 9 hom tshuaj sib xyaw ua ke (2 hom kev ua kom qhuav thiab 7 hom kev ntub dej):

1. Qhuav moulding

1.1 Qhuav nias

Kev Ntsuas Cov Tshuab Qhuav Siv Rau Cov Nias Ceramic Hmoov rau hauv qee yam duab ntawm lub cev. Nws cov essence yog tias nyob rau hauv kev txiav txim ntawm sab nraud quab yuam, cov hmoov perrow mus ze rau ntawm cov pwm, thiab khov kho ua ke los ntawm kev txhuam sab hauv kom muaj qee yam duab. Lub ntsiab tsis xws luag nyob rau hauv qhuav-nias lub cev yog kev sib txhuam, uas yog vim kev sib txhuam ntawm cov hmoov thiab cov pwm ntoo, ua rau poob siab hauv lub cev.

Qhov zoo ntawm qhuav nias yog qhov loj ntawm lub cev ntsuab yog qhov tseeb, kev ua haujlwm yog yooj yim, thiab nws yooj yim rau kev ua haujlwm mechanized; Cov ntsiab lus ntawm cov dej noo thiab phau ntawv nyob rau hauv ntsuab qhuav nias yog tsawg dua, thiab kev ziab thiab tua hluav taws me me. Nws yog tsuas yog siv los ua cov khoom lag luam nrog cov duab yooj yim, thiab cov kev sib piv yog me me. Cov nqi ntau lawm tsim los ntawm kev hnav pwm yog qhov tsis zoo ntawm kev nias kom qhuav.

1.2 isostatic nias

Isostatic Pressing yog txoj kev tshwj xeeb tsim los ntawm cov kev nias qhuav. Nws siv cov kua dej hloov kho kom zoo rau kev thov nias tusyees rau cov hmoov sab hauv Elastic pwm los ntawm txhua cov lus qhia. Vim muaj kev sib xws ntawm cov kua dej hauv cov kua, cov hmoov bears tib lub siab hauv txhua qhov kev qhia, yog li qhov sib txawv ntawm lub cev ntsuab tuaj yeem zam tau.

Isostatic nias tau muab faib ua cov hnab ntim ntub dej isostatic nias thiab lub hnab qhuav yogostatic nias. Cov hnab ntim ntub hluav taws xob nias tau cov khoom lag luam nrog cov duab nyuaj, tab sis nws tsuas tuaj yeem ua haujlwm sib txuam. Lub hnab qhuav yog casosteratic nias tau paub kev lag luam tsis tu ncua, tab sis tsuas yog tsim cov khoom lag luam nrog cov xwm txheej yooj yim xws li square, puag ncig, thiab tubular cross-sections. ISostatic nias tuaj yeem tau txais kev hnav khaub ncaws thiab lub cev ua kom nruj thiab cov khoom siv hluav taws xob tsis zoo, thiab nws tsuas yog tsim nyog rau cov khoom siv nrog cov cai tshwj xeeb.

2. Ntub txoj kev

2.1 grouting
Cov txheej txheem moulding zoo ib yam li cov kab xev casting, qhov sib txawv yog tias cov txheej txheem moulding muaj xws li cov txheej txheem lub cev lub cev qhuav dej thiab tshuaj lom neeg cov txheej txheem kev nqus dej. Lub cev qhuav dej ntawm lub cev tshem tawm cov dej hauv cov slurry los ntawm kev ua tus capillary ntawm cov ntxig gypsum pwm. Lub CA2 + tsim los ntawm cov kev sib cais ntawm cov chaw cas ntawm CASO4 nce lub ionic lub zog ntawm cov slurry, ua rau hauv flocculation ntawm slurry.
Nyob rau hauv kev txiav txim ntawm lub cev qhuav dej thiab tshuaj sib sib zog nqus, cov hmoov nplej tej khoom sib xyaw kom tau muab tso rau ntawm Gypsum pwm. Grouting yog tsim nyog rau kev npaj ntawm loj-teev ceramic qhov nrog cov duab ntsuab, suav nrog cov neeg ua haujlwm tau siab, thiab nws tsis haum rau cov haujlwm ua haujlwm.

2.2 Kub tuag casting
Kub tuag casting yog kom sib xyaw ceramic hmoov nrog binder (paraffin) ntawm qhov kub siab (60 ~ 100 ℃) kom tau txais qhov slurry rau kub tuag ciaj. Cov slurry yog txhaj rau hauv cov hlau pwm hauv qab kev txiav txim ntawm cov cua compressed, thiab lub siab yog tswj. Txias txias, demoulding kom tau txais ib qho av dawb, cov ciab dawb paug yog dewaxed nyob rau hauv kev tiv thaiv ntawm ib lub cev ntsuab, thiab lub cev ntsuab yog qhov kub thiab txias los ua cov yeeb yaj kiab.

Lub cev ntsuab tsim los ntawm kub tuag camting tau pom qhov ntev, hnav khaub ncaws sab hauv kev ua haujlwm sab hauv thiab tsim muaj rau ntau yam khoom siv raw. Qhov ntsuas kub ntawm cov ciab slurry thiab pwm xav tau nruj me ntsis tswj, txwv tsis pub nws yuav tsis haum rau kev tsim cov txheej txheem loj thiab muaj zog tau noj yog qhov siab.

2.3 Daim Kab Xev Casting
Daim kab xev casting yog kom ua tiav cov hmoov av Ceramic nrog cov khoom siv khov kho, thiab lwm yam. Kom tau txais lub tshuab so kom zoo, thiab siv tus scraper kom tswj tau tuab. Nws ntws tawm mus rau tus nqi conveyor los ntawm cov pub mis nozzle, thiab zaj duab xis dawb yog tau txais tom qab ziab.

Tus txheej txheem no yog tsim nyog rau kev npaj ntawm cov ntaub ntawv zaj duab xis. Txhawm rau kom tau yooj yim dua yooj yim, ntau ntau ntawm cov organic muaj teeb meem, thiab cov txheej txheem tsis yooj yim sua kom tsis txhob muaj zog, tsis muaj zog, tsis yooj yim peexing. Cov organic muaj teeb meem siv yog tshuaj lom thiab yuav ua rau cov pa phem ib puag ncig, thiab cov tshuaj lom ib puag ncig yuav tsum tau siv ntau li ntau qhov chaw muaj kuab paug ib puag ncig.

2.4 Gel Txhaj Moulding
Gel txhaj tshuaj molding yog ib tug tshiab colloidal prototyping txheej txheem ua ntej tsim los ntawm cov kws tshawb fawb ntawm Oak Rida National Laboratory nyob rau xyoo 1990. Ntawm nws cov tub ntxhais yog kev siv cov organic monomer daws teeb meem uas polymerize rau hauv siab-zog, txuas ntxiv txuas polymer-kuab tshuaj.

Lub slurry ntawm Ceramic Hmoov yaj ntawm kev daws teeb meem ntawm cov organic monomers tau nrum hauv cov pwm, thiab monomer sib tov polymerizes los ua ib feem. Txij li tom qab txuas ntxiv polymer-kuab muaj tsuas yog 10%-20% (pawg feem tau yooj yim tshem tawm cov hnyav los ntawm cov kauj ruam ziab. Nyob rau tib lub sijhawm, vim yog ib qho kev sib txuas ib sab ntawm cov polymers, cov polymers tsis tuaj yeem tsiv mus nyob nrog cov kuab tshuaj thaum lub sijhawm ua kom qhuav.

Txoj kev no tuaj yeem siv los tsim ib leeg-theem thiab cov khoom sib xyaw ua ke, thiab nws lub zog ntsuab, thiab ntau dua li 20-30mpa lossis ntau dua, uas tuaj yeem rov ua dua. Qhov teeb meem tseem ceeb ntawm txoj kev no yog lub shrinkage tus nqi ntawm lub cev embryo ntawm lub cev ntawm cov txheej txheem densification, uas yooj yim ua rau kev tawm tsam ntawm lub cev embryo; Qee cov organic monomers muaj oxygen inhibition, uas ua rau saum npoo mus tev thiab poob tawm; Vim tias qhov ntsuas kub-indass monomer polymerization, ua rau kub ua kom sov ua rau muaj kev ntxhov siab sab hauv.

2.5 ncaj qha txhaj tshuaj moulding
Saib xyuas ncaj qha txhaj tshuaj yog lub tshuab siv tshuaj molding los ntawm kev ntxiv cov pob hluav taws xob, cov khoom siv hluav taws xob ua tau zoo, cov khoom siv hluav taws xob ntau, ces cov slurry yog txhaj rau hauv cov tsis muaj ntsej muag.

Tswj cov kev vam meej ntawm kev siv tshuaj lom neeg thaum cov txheej txheem. Qhov tshuaj tiv thaiv ua ntej txhaj tshuaj molding yog nqa tawm maj mam, lub viscosity ntawm kev txhaj tshuaj me me, thiab cov tshuaj tsw qab yog hloov mus rau lub cev khov kho. Lub cev tau txais ntsuab lub cev muaj cov khoom siv zoo thiab lub zog tuaj yeem ncav cuag 5kPA. Lub cev ntsuab tau hais txog, qhuav thiab sintered los ua ib qho kev sib cav ntawm qhov xav tau.

Nws cov txiaj ntsig yog tias nws tsis tas yuav tsum muaj ib qho me me ntawm cov organic hauv lub cev (55% ~ 70%), thiab nws tuaj yeem tsim cov khoom loj thiab cov khoom sib xyaw. Nws qhov tsis zoo yog tias cov ntxiv ntxiv tau kim, thiab cov roj feem ntau tso thaum cov tshuaj tiv thaiv.

2.6 Txhaj Tshuaj Molding
Txhaj tshuaj molding tau ntev tau siv nyob rau hauv cov pwm ntawm cov khoom siv yas thiab moulding ntawm cov hlau pwm. Txoj kev no siv cov ntsuas kub tsawg ntawm thermoplastic organics lossis kev mob siab los kho cov khoom siv thermosetting. Cov hmoov thiab cov organic cab kuj sib xyaw ua ke hauv cov khoom siv sib xyaw tshwj xeeb, thiab tom qab ntawd txhaj rau hauv cov pwm ua kom muaj ntau pua mpa). Vim yog lub tshuab moulding loj, cov tau cov npe tau pom qhov ntev, lub siab du thiab cov qauv compact; Kev siv cov khoom siv tshwj xeeb moulding heev txhim kho kev ua haujlwm tau zoo.

Thaum xyoo 1970 thiab thaum ntxov xyoo 1980s, kev txhaj tshuaj molding cov txheej txheem rau moulding ntawm cov kab ceramic. Cov txheej txheem no paub cov yas molding los ntawm kev ntxiv cov khoom muaj ntau ntau ntawm cov organic, uas yog ib qho kev sib xyaw ua ke ceramic yas moulding. Nyob rau hauv kev txhaj tshuaj molding tshuab, ntxiv rau siv Thermoplastic Organics (xws li cov khoom siv roj av, nws yog qhov chaw ua haujlwm ntawm cov txheej txheem ntawm Ceramic), nws yog qhov kev txhaj tshuaj ntawm Ceramic.

Kev txhaj tshuaj moulding muaj qhov zoo ntawm cov qib siab ntawm kev siv tshuab thiab precise loj ntawm cov pwm dawb paug. Txawm li cas los xij, cov ntsiab lus organic nyob rau hauv lub cev ntsuab ntawm kev txhaj tshuaj ceramic cov khoom muaj ntau li 50vol%. Nws siv sijhawm ntev heev, txawm tias ob peb hnub rau ntau hnub rau cov hnub qub, txhawm rau tshem tawm cov tshuaj organic hauv cov txheej txheem Sintering tom ntej, thiab nws yooj yim rau kev ua kom zoo.

2.7 Colloidal Txhaj Tshuaj Molding
Txhawm rau daws cov teeb meem ntawm cov khoom muaj teeb meem loj thiab tsim kev txhaj tshuaj molding ntawm ceramic txhaj tshuaj molding cov qauv tshuaj tiv thaiv kab ke kom paub qhov kev txhaj tshuaj ntawm barren ceramic slurry. sib sau.

Cov tswv yim yooj yim yog los ua ke colloidal moulding nrog txhaj tshuaj molding, siv cov cuab yeej tsim kho tswv yim thiab kho tshuab tshiab tau muab los ntawm kev sib xyaw ntawm cov txheej txheem colloidal. Txoj kev tshiab no siv tsawg dua 4WT.% Ntawm cov organic. Ib qho me me ntawm cov organic monomers lossis cov organic sib txuas yog siv los ua kom pom kev polomicic Ntawm lawv, tsis tsuas yog lub sijhawm ntawm Degumming tau zoo heev shortened, tab sis kuj tseem muaj peev xwm ntawm kev tawg ntawm degumming tau zoo heev txo.

Muaj qhov sib txawv loj ntawm kev txhaj tshuaj molding ntawm ceramics thiab colloidal moulding. Lub ntsiab sib txawv yog tias cov qub belongs rau qeb ntawm yas moulding, uas yog, cov slurry tsis muaj cov yas thiab yog cov khoom siv barren. Vim hais tias cov slurry tsis muaj cov yas nyob rau hauv colloidal molding, lub tswv yim ib txwm muaj kev txhaj tshuaj ceramic tuaj yeem raug saws. Yog tias colloidal molding yog sib xyaw nrog kev txhaj tshuaj molding ntawm cov cuab yeej tshuaj thiab kho tshuab tshiab muab los ntawm colloidal hauv cov txheej txheem colloidal.

Tus txheej txheem tshiab ntawm kev txhaj tshuaj colloidal ntawm ceramics yog txawv ntawm General colloidal molding thiab kev txhaj tshuaj ib txwm moulding. Qhov zoo dua ntawm kev kawm qib siab ntawm kev molding tshuab yog qhov tsim nyog subloidal txheej txheem, uas yuav dhau los ua kev cia siab rau kev lag luam ntawm High-tech ceramics.