Cov nyhuv ntawm sintering ntawm cov khoom ntawm zirconia ceramics

Cov nyhuv ntawm sintering ntawm cov khoom ntawm zirconia ceramics

Raws li ib yam ntawm cov khoom siv ceramic, zirconium muaj lub zog siab, siab hardness, 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 loj hlob ntawm kev lag luam hniav hniav nyob rau hauv xyoo tas los no, zirconia ceramics tau dhau los ua cov khoom siv hniav zoo tshaj plaws thiab nyiam cov neeg tshawb nrhiav ntau.

Kev ua tau zoo ntawm zirconia ceramics yuav cuam tshuam los ntawm ntau yam, hnub no peb tham txog qhov cuam tshuam ntawm sintering ntawm qee yam khoom ntawm zirconia ceramics.

Txoj kev sintering

Cov txheej txheem sintering ib txwm yog ua kom sov lub cev los ntawm hluav taws xob hluav taws xob, hluav taws xob hluav taws xob, hluav taws xob hluav taws xob, kom cov cua sov los ntawm qhov chaw ntawm zirconia mus rau sab hauv, tab sis thermal conductivity ntawm zirconia yog qhov phem dua li ntawm alumina thiab lwm yam khoom siv ceramic. Txhawm rau tiv thaiv kev tawg los ntawm kev ntxhov siab thermal, cov tsoos cua kub ceev yog qeeb thiab lub sij hawm ntev, uas ua rau lub voj voog ntawm zirconia ntev thiab cov nqi ntau lawm. Nyob rau hauv xyoo tas los no, kev txhim kho cov txheej txheem ntawm zirconia, txo lub sijhawm ua haujlwm, txo cov nqi tsim khoom, thiab muab kev ua haujlwm siab ntawm cov hniav zirconia ceramics tau dhau los ua qhov tseem ceeb ntawm kev tshawb fawb, thiab microwave sintering yog undoubtedly ib txoj kev cog lus sintering.

Nws pom tias microwave sintering thiab atmospheric siab sintering tsis muaj qhov sib txawv ntawm qhov cuam tshuam ntawm semi-permeability thiab hnav tsis kam. Yog vim li cas yog qhov ntom ntawm zirconia tau los ntawm microwave sintering zoo ib yam li cov pa sintering, thiab ob qho tib si yog ntom sintering, tab sis qhov zoo ntawm microwave sintering yog kub sintering tsawg, ceev ceev thiab luv sintering lub sij hawm. Txawm li cas los xij, qhov kub nce ntawm atmospheric siab sintering yog qeeb, lub sij hawm sintering ntev dua, thiab tag nrho sintering lub sij hawm yog kwv yees li 6-11 teev. Piv nrog rau lub siab sintering ib txwm, microwave sintering yog ib txoj kev sintering tshiab, uas muaj qhov zoo ntawm lub sij hawm luv luv sintering, high efficiency thiab lub zog txuag, thiab tuaj yeem txhim kho microstructure ntawm ceramics.

Qee cov kws tshawb fawb tseem ntseeg tias zirconia tom qab microwave sintering tuaj yeem tswj tau ntau dua metastable tequartet theem, tej zaum vim tias microwave cua kub ceev tuaj yeem ua tiav qhov ceev ceev ntawm cov khoom ntawm qhov kub thiab txias, cov nplej loj me me thiab ntau dua li qhov qub siab sintering, qis dua. qhov tseem ceeb theem kev hloov pauv loj ntawm t-ZrO2, uas yog qhov tsim nyog rau kev tswj kom ntau li ntau tau hauv lub xeev metastable ntawm chav tsev kub, txhim kho lub zog thiab toughness ntawm cov ntaub ntawv ceramic.

Ob chav sintering txheej txheem

Compact sintered zirconia ceramics tsuas tuaj yeem ua tiav nrog cov cuab yeej txiav emery vim qhov nyuaj thiab lub zog, thiab cov nqi ua haujlwm siab thiab lub sijhawm ntev. Txhawm rau daws 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 rau qhov xav tau, thiab tom qab ntawd sintering mus rau qhov kawg sintering kub los ua. cov ntaub ntawv ntom ntom.

Nws tau pom tias ob txoj kev sintering yuav hloov cov sintering kinetics ntawm zirconia ceramics, thiab yuav muaj qee yam cuam tshuam rau sintering ntom, txhua yam khoom thiab microstructure ntawm zirconia ceramics. Cov cuab yeej cuab tam ntawm machinable zirconia ceramics sintered ib zaug ntom zoo dua cov sintered ob zaug. Lub biaxial dabtsi yog khoov lub zog thiab tawg toughness ntawm machinable zirconia ceramics sintered ib zaug compact yog siab tshaj cov sintered ob zaug. Hom kev tawg ntawm thawj sintered zirconia ceramics yog transgranular / intergranular, thiab cov tawg tawm tsam yog ncaj. Hom tawg ntawm ob zaug sintered zirconia ceramics yog feem ntau intergranular puas, thiab cov kab nrib pleb yog ntau tortuous. Cov yam ntxwv ntawm kev sib xyaw puas hom yog zoo dua li yooj yim intergranular puas hom.

Sintering nqus tsev vacuum

Zirconia yuav tsum tau sintered nyob rau hauv lub tshuab nqus tsev ib puag ncig, nyob rau hauv lub sintering txheej txheem yuav tsim ib tug loj tus naj npawb ntawm npuas, thiab nyob rau hauv ib tug lub tshuab nqus tsev ib puag ncig, npuas yog yooj yim mus tso tawm los ntawm lub molten lub xeev ntawm lub plooj (porcelain) lub cev, txhim kho qhov ntom ntawm zirconia, yog li ua kom cov zirconia. semi-permeability thiab mechanical zog ntawm zirconia.

Cua sov tus nqi

Nyob rau hauv cov txheej txheem sintering ntawm zirconia, thiaj li yuav tau txais kev ua tau zoo thiab cov txiaj ntsig xav tau, yuav tsum tau txais cov cua kub qis dua. Cov cua kub siab ua rau qhov kub thiab txias ntawm zirconia tsis sib xws thaum mus txog qhov kawg sintering kub, ua rau cov tsos ntawm cov kab nrib pleb thiab tsim cov pores. Cov txiaj ntsig tau pom tias nrog qhov nce ntawm cov cua sov, lub sij hawm crystallization ntawm zirconia muaju yog luv, cov roj ntawm cov muaju tsis tuaj yeem tawm, thiab cov porosity hauv cov zirconia crystals nce me ntsis. Nrog rau qhov nce ntawm cov cua sov, me me ntawm monoclinic siv lead ua theem pib muaj nyob rau hauv tetragonal theem ntawm zirconia, uas yuav cuam tshuam rau cov khoom siv kho tshuab. Nyob rau tib lub sijhawm, nrog rau qhov nce ntawm cov cua sov, cov nplej yuav polarized, uas yog, kev sib koom ua ke ntawm cov nplej loj thiab me me yog qhov yooj yim. Cov cua sov qeeb qeeb yog qhov tsim nyog rau kev tsim cov nplej ntau dua, uas ua rau cov semipermeability ntawm zirconia.