Piv nrog rau lwm txoj hauv kev ua cov txheej txheem, xws li grouting, qhuav nias thiab txias isostatic nias,&"; hmoov txhaj tshuaj molding &"; thev naus laus zis yog nyob hauv plaub yam: tivthaiv qhov loj me qhov tseeb, muaj peev xwm ua tau ntau lawm, tsim cov khoom nyuaj thiab ntom tsis sib xws. Nws zoo dua li lwm cov txheej txheem. Tam sim no, cov khoom siv ceramic haum rau cov txheej txheem no suav nrog alumina ceramic, zirconia ceramic thiab silicon nitride ceramic.
Cov txheej txheem txhaj tshuaj molding txheej txheem suav nrog cov kauj ruam hauv qab no: sib xyaw thiab granulating, txhaj, degreasing, thiab sintering. Thawj kauj ruam yog los ua ke cov yas yas yas [xws li polypropylene (PP) lossis polyethylene (Polyethylene, PE)] nrog cov hmoov txhuv nplej siab sib xyaw thiab sib tov ntawm qhov kub siab tshaj qhov melting point ntawm yas. Txhawm rau txhawm rau txhim kho kev sib xyaw ua ke thiab ua cov yam ntxwv tom qab ntawm qhov sib xyaw, feem ntau nws yog qhov yuav tsum tau ntxiv tus neeg sawv cev cuam tshuam (tus neeg sawv cev cuam tshuam) thiab cov yas yas (Plasticizer) txhawm rau nce cov txiaj ntsig ntawm kev txhaj tshuaj. Tom qab ntawd cov khoom sib xyaw tau muab granulated thiab pub rau hauv lub tshuab txhaj tshuaj txhawm rau tswj kev txhaj tshuaj siab, ntsuas kub ntawm cov khoom siv tshuaj, thiab txhaj tshuaj tuav lub sijhawm siab thiab lwm yam tsis, thiab cov yas/yas lub cev ntsuab tuaj yeem txhaj rau hauv pwm. Nws cov duab lossis Qhov loj me zoo ib yam li cov khoom yas tam sim no ntawm kev ua lag luam, tshwj tsis yog lub cev ntsuab muaj ntau dua 50 vol% ntawm cov hmoov ceramic. Yog li ntawd, hais txog cov yam ntxwv ntawm kev txhaj tshuaj rheology, kev txhaj tshuaj ntawm cov khoom siv sib txawv heev los ntawm kev txhaj tshuaj yas.
Ua ntej lub ceramic ntsuab lub cev tau sintered ntawm qhov kub siab, cov yas polymer yuav tsum tau muab tshem tawm. Cov txheej txheem tshem tawm tam sim no suav nrog thermal debinding thiab solvent degreasing. Ib qho ntxiv, kev siv tshuab degreasing hauv kev txhim kho yog" txoj hauv kev nqus cov tshuab nqus tsev." Thiab" supercritical kua degreasing txoj kev." Cov cua sov siv cua sov degreasing feem ntau yog 1-2 ° C/teev, yog li lub sijhawm yuav tsum tau degreasing feem ntau yog 40-120 teev, thiab cov qauv tuab yuav tsum tsawg dua tsib centimeters kom tsis txhob muaj qhov tsis xws ntawm npuas thiab tawg thaum lub sijhawm degreasing txheej txheem. Txhawm rau txhawm rau txhim kho kev ua haujlwm ntawm degreasing thiab txo lub sijhawm ntawm degreasing,&"; cov txheej txheem degreasing &"; tsuas yog tsim los nyob rau kaum xyoo dhau los. Txoj hauv kev no siv cov kuab tshuaj yas polymer yaj, xws li acetone thiab alkanes, txhawm rau ua cov tshuaj ntsuab ntsuab thiab tshem feem ntau ntawm lawv ua ntej. Cov yas uas hnyav-molecular-hnyav, thiab ua kom cov pores zoo hauv cov qauv, thiab tom qab ntawd ua kom cua sov poob qis, tag nrho lub sijhawm degreasing tuaj yeem luv dua ntau dua 3/4. Cov thev naus laus zis ntawm kev degreasing nrawm yog cov thev naus laus zis tseem ceeb tam sim no hauv kev txhim kho.
Txhawm rau kom ua tiav qhov sib xws thiab qhov hws zoo nyob rau hauv lub cev tsis muaj zog degreased, hauv cov txheej txheem tom qab sib txuas, kom ntseeg tau tias lub cev nqaij daim tawv ntawm lub cev sintered zoo ib yam, muaj tsawg kawg kaum plaub yam uas yuav tsum tau them sai sai rau ua ntej thiab tom qab txhaj tshuaj . Ua li no, txheej txheem txhaj tshuaj zoo, ua ke nrog kev nrawm thiab ua kom tiav thiab txheej txheem txheej txheem, yog cov kauj ruam tseem ceeb kom ntseeg tau cov khoom lag luam zoo. Txij li kev tswj hwm qhov loj me thiab rov tsim dua tshiab ntawm kev txhaj tshuaj cov khoom lag luam tau zoo heev (kev lag luam tuaj yeem ncav cuag txog rau txhiab txhiab ntawm qhov loj me me rov ua dua tshiab), tus nqi ntawm cov khoom siv sib tsoo ntawm cov khoom tom qab tua tau me me, cov nqi ua tiav tuaj yeem txo qis, thiab cov khoom lag luam tus nqi sib tw heev.
