Ua ib hom khoom siv ceramic, zirconium muaj lub zog siab, siab tawv, zoo hnav tsis kam, acid thiab alkali tsis kam, kub tsis kam thiab lwm yam khoom zoo heev. Ntxiv nrog rau kev siv dav hauv kev lag luam, nrog rau kev txhim kho ntawm kev lag luam hniav cuav hauv xyoo tas los no, zirconia ceramics tau dhau los ua cov khoom siv hniav cuav muaj peev xwm tshaj plaws thiab nyiam cov neeg tshawb fawb ntau tus.
Txoj kev sintering
Txoj kev sintering ib txwm yog kom cua sov lub cev los ntawm kev tshav kub, kev coj cua sov, kev sib xyaw cua sov, kom cua sov los ntawm qhov chaw ntawm zirconia mus rau sab hauv, tab sis qhov thermal conductivity ntawm zirconia phem dua li ntawm alumina thiab lwm yam khoom siv ceramic. Yuav kom tiv thaiv kev tawg los ntawm kev ntxhov siab thermal, qhov ceev cua sov ib txwm qeeb thiab lub sijhawm ntev, uas ua rau lub voj voog ntau lawm ntawm zirconia ntev thiab tus nqi tsim khoom siab. Nyob rau hauv xyoo tas los no, kev txhim kho cov txheej txheem ua tiav ntawm zirconia, luv lub sijhawm ua tiav, txo tus nqi tsim khoom, thiab muab cov khoom siv ceramic zirconia hniav ua tau zoo tau dhau los ua qhov tseem ceeb ntawm kev tshawb fawb, thiab microwave sintering yog qhov tsis ntseeg ib txoj kev sintering cog lus.
Nws pom tau tias microwave sintering thiab atmospheric pressure sintering tsis muaj qhov sib txawv tseem ceeb rau qhov cuam tshuam ntawm semi-permeability thiab hnav tsis kam. Qhov laj thawj yog tias qhov ceev ntawm zirconia tau los ntawm microwave sintering zoo ib yam li cov sintering ib txwm muaj, thiab ob qho tib si yog sintering ntom ntom, tab sis qhov zoo ntawm microwave sintering yog qhov kub sintering qis, ceev ceev thiab lub sijhawm sintering luv luv. Txawm li cas los xij, qhov kub nce ntawm atmospheric pressure sintering qeeb, lub sijhawm sintering ntev dua, thiab tag nrho lub sijhawm sintering yog kwv yees li 6-11 teev. Piv nrog rau qhov siab sintering ib txwm muaj, microwave sintering yog ib txoj kev sintering tshiab, uas muaj qhov zoo ntawm lub sijhawm sintering luv luv, kev ua haujlwm siab thiab kev txuag hluav taws xob, thiab tuaj yeem txhim kho microstructure ntawm ceramics.
Qee cov kws tshawb fawb kuj ntseeg tias zirconia tom qab microwave sintering tuaj yeem tswj tau ntau dua metastable tequartet theem, tej zaum vim tias microwave cua sov sai tuaj yeem ua tiav qhov ceev ntawm cov khoom ntawm qhov kub qis dua, qhov loj ntawm cov noob me dua thiab sib xws dua li ntawm qhov siab sintering ib txwm muaj, qis dua qhov tseem ceeb theem hloov pauv loj ntawm t-ZrO2, uas yog qhov zoo rau kev tswj hwm ntau li ntau tau hauv lub xeev metastable ntawm chav tsev kub, txhim kho lub zog thiab toughness ntawm cov ntaub ntawv ceramic.
Cov txheej txheem sintering ob npaug
Cov khoom siv zirconia ceramics me me tsuas yog siv tau nrog cov cuab yeej txiav emery vim nws muaj zog thiab tawv, thiab tus nqi ua haujlwm siab thiab lub sijhawm ntev. Yuav kom daws tau cov teeb meem saum toj no, qee zaum zirconia ceramics yuav siv ob zaug sintering txheej txheem, tom qab tsim lub cev ceramic thiab pib sintering, CAD / CAM amplification machining mus rau qhov xav tau, thiab tom qab ntawd sintering mus rau qhov kub sintering kawg kom ua rau cov khoom siv ntom ntom.
Nws pom tau tias ob txoj kev sintering yuav hloov pauv qhov kinetics sintering ntawm zirconia ceramics, thiab yuav muaj qee qhov cuam tshuam rau qhov ceev sintering, cov khoom siv kho tshuab thiab microstructure ntawm zirconia ceramics. Cov khoom siv kho tshuab ntawm cov zirconia ceramics machinable sintered ib zaug ntom zoo dua li cov sintered ob zaug. Lub zog khoov biaxial thiab qhov tawg toughness ntawm cov zirconia ceramics machinable sintered ib zaug compact yog siab dua li cov sintered ob zaug. Hom tawg ntawm thawj sintered zirconia ceramics yog transgranular / intergranular, thiab qhov tawg tawm yog ncaj qha. Hom tawg ntawm ob zaug sintered zirconia ceramics yog feem ntau intergranular tawg, thiab qhov tawg sib txawv yog ntau dua tortuous. Cov khoom ntawm hom tawg sib xyaw zoo dua li hom tawg yooj yim intergranular.
Sintering nqus tsev
Zirconia yuav tsum tau sintered nyob rau hauv ib puag ncig nqus tsev, nyob rau hauv cov txheej txheem sintering yuav tsim ntau tus npuas, thiab nyob rau hauv ib puag ncig nqus tsev, npuas yooj yim rau kev tso tawm ntawm lub xeev molten ntawm lub cev porcelain, txhim kho qhov ceev ntawm zirconia, yog li ua rau kom muaj semi-permeability thiab cov khoom siv kho tshuab ntawm zirconia.
Tus nqi cua sov
Hauv cov txheej txheem sintering ntawm zirconia, txhawm rau kom tau txais kev ua tau zoo thiab cov txiaj ntsig xav tau, yuav tsum tau txais tus nqi cua sov qis dua. Tus nqi cua sov siab ua rau qhov kub sab hauv ntawm zirconia tsis sib npaug thaum mus txog qhov kub sintering kawg, ua rau muaj cov kab nrib pleb thiab tsim cov qhov hws. Cov txiaj ntsig qhia tau tias nrog rau kev nce ntawm tus nqi cua sov, lub sijhawm crystallization ntawm zirconia crystals luv dua, cov roj ntawm cov crystals tsis tuaj yeem tso tawm, thiab porosity hauv zirconia crystals nce me ntsis. Nrog rau kev nce ntawm tus nqi cua sov, ib qho me me ntawm monoclinic crystal theem pib muaj nyob rau hauv theem tetragonal ntawm zirconia, uas yuav cuam tshuam rau cov khoom siv kho tshuab. Tib lub sijhawm, nrog rau kev nce ntawm tus nqi cua sov, cov noob yuav polarized, uas yog, kev sib koom ua ke ntawm cov noob loj dua thiab me dua yog yooj yim. Tus nqi cua sov qeeb dua yog qhov ua rau muaj cov noob sib xws ntau dua, uas ua rau semipermeability ntawm zirconia nce.
Lub sijhawm tshaj tawm: Lub Yim Hli-15-2023