Zirconia Toughened Alumina rau Advanced Applications

ZTA yog cov khoom siv alumina-zirconia sib xyaw, distinguished los ntawm superior zog thiab toughness. Ua los ntawm kev ntxhov siab vim kev hloov pauv ntawm cov nplua tetragonal zirconia hais hauv alumina matrix.

Zirconia ceramics yog cov khoom siv zoo tshaj plaws, boasting zoo heev hardness, thermal stability, hnav tsis kam thiab kev ua haujlwm ib puag ncig uas ntau lwm cov ceramics tsis tuaj yeem ua. Cov hlau thiab yas tsis tuaj yeem sib piv. Tsis tas li ntawd xwb, zirconia ceramics kuj tseem muaj qhov ua tau zoo rau kev ua cov cuab yeej.

Lub zog

ZTA sawv tawm ntawm cov ntaub ntawv ceramic nrog nws lub zog tshwj xeeb thiab tawv, hnav tsis kam, tshuaj inertness, tsis tshua muaj kev sib txhuam coefficient, siab hardness/stiffness ratio thiab kuj tsis tshua muaj thermal expansion coefficient piv rau lwm tus – ua rau nws yog ib qho khoom siv zoo tshaj plaws rau kev siv xws li cov cuab yeej txiav. Tsis tas li ntawd xwb, nws biocompatibility kuj ua rau ZTA xaiv cov khoom zoo nkauj.

ZTA tau txhais los ntawm nws cov kev faib tawm zoo heev ntawm tetragonal zirconia hais nyob rau hauv ib qho alumina matrix. Qhov no yog ua tiav los ntawm kev siv cov txheej txheem sib xyaw ua ke xws li pob milling thiab lub zog siab milling.; ib zaug sib xyaw ua ke cov hmoov tuaj yeem tsim rau hauv lawv cov khoom siv uas siv cov xovxwm qhuav, isostatic nias, txhaj tshuaj molding los yog extrusion txheej txheem.

Zirconia dispersed thoob plaws hauv alumina matrix txhim kho pob txha toughness los ntawm absorbing thiab dissipating tawg zog, hu ua transformation toughening. Zirconia kuj tseem ua rau hnav tsis kam los ntawm kev tsim cov kev ntxhov siab uas tiv thaiv kev tawg tawm – hu ua self-sharpening – ua ZTA ib qho kev xaiv zoo heev rau kev sib tsoo log.

Toughness

Zirconia Toughened Alumina (ZTA) ceramics khav theeb impressive zog thiab puas toughness, ua rau lawv zoo meej rau kev siv thoob plaws ntau yam kev siv thiab ib puag ncig. Qhov zoo tshaj plaws resilience no los ntawm kev ntxhov siab-induced theem transformation ntawm nplua, uniformly dispersed tetragonal zirconia hais dispersed nyob rau hauv ib tug alumina matrix; Kev ntxhov siab induces theem transformation los tsim microcrack tes hauj lwm ntawm zirconia-alumina uas nqus lub zog ntawm tawg propagation zoo ncua lawv kev sib kis thaum nce pob txha tiv thaiv. (Clausen 1976).

ZTA sawv tawm vim nws cov thermal shock tsis kam. Ua tsaug rau nws qhov tshwj xeeb ua ke ntawm tetragonal-monoclinic theem muaj pes tsawg leeg, cov ceramic no tuaj yeem tiv taus kev hloov pauv sai hauv qhov kub thiab txias yam tsis muaj kev tawg lossis tawg, Thaum muaj kev ntxhov siab vim kev hloov pauv ntawm zirconia rau hauv nws daim ntawv metastable tetragonal tsim cov kev ntxhov siab uas tawm tsam qhov tsim ntawm cov kab nrib pleb hauv nws cov alumina matrix thiab ua rau muaj zog hnyav yog li ntxiv ZTA qhov kev ua tau zoo..

ZTA khav theeb tsis yog nws lub zog xwb, tetragonal-monoclinic qauv thiab siab tawg toughness, tab sis kuj muaj tsawg coefficient ntawm thermal expansion (CTE), ua rau nws tsim nyog rau cov ntawv thov uas xav tau qhov kub thiab txias lossis ib puag ncig uas qhov kev ruaj ntseg yog qhov tseem ceeb, xws li precision Cheebtsam lossis cov khoom siv hluav taws xob.

ZTA sawv tawm ntawm cov ntaub ntawv cog lus kho mob vim nws kev sib xyaw ntawm cov tshuaj tsis haum, mechanical zog thiab kev nyuaj siab pab corrosion kuj nyob rau hauv dej los yog lub cev kua, ua rau nws yog tus neeg sib tw tseem ceeb rau kev kho mob cog xws li orthopedic femoral hau thiab acetabular liners. BioLOX Delta biomaterial yog ib qho piv txwv zoo li no; siv dav hauv kev phais orthopedic rau ob daim ntawv thov.

Corrosion Resistance

ZTA boasts superior zog ntawm ob qho tib si alumina thiab zirconia, ua rau nws resistant rau tshuaj tua kab mob thiab hnav, ua rau nws zoo meej rau cov ntawv thov cuam tshuam nrog corrosion-nrhiav ib puag ncig lossis rov ua dua kev sib txhuam lossis kev ntxhov siab txhua yam.

Kev sib xyaw ntawm alumina hardness nrog zirconia lub toughness ua rau cov khoom zoo heev tribological uas ua rau kev hnav zoo heev hauv cov khoom nrog hnyav hnyav thiab siv mus ntev., xws li orthopedic implants, cov cuab yeej txiav thiab hnav cov khoom siv tiv taus siv hauv kev tswj cov dej (xov guides, bearings, nozzles lwm). Qhov kev sib xyaw no tshwj xeeb yog siv rau hauv kev kho mob thiab kev lag luam xws li kev cog hniav orthopedic, cov cuab yeej txiav los yog kev tswj dej (xov guides bearings nozzles thiab lwm yam).

ZTA qhov kev txhim kho pob txha toughness tuaj yeem raug ntaus nqi rau nws cov khoom zoo zirconia hauv nws cov alumina matrix. Thaum tawg pib propagation, thaum lawv lub zog nce thiab nthuav tawm ntxiv nrog, Cov tetragonal zirconia nplej tau dhau los ua theem hloov pauv kom nqus tau thiab dissipate nws ua ib feem ntawm kev hloov pauv toughening mechanism – li no txhim kho pob txha toughness ntawm cov khoom no.

Kev vam meej hauv kev tsim ZTA ceramic lies nyob rau hauv kev siv premium-zoo zirconia thiab alumina hmoov dawb los ntawm impurities. Sintering yuav tsum tau tswj kom tsis txhob muaj kev hloov pauv ntawm tetragonal-rau-monoclinic zirconia thaum lub caij txias thiab txo qis metastable monoclinic theem tsim uas muaj kev cuam tshuam rau chemisorption nrog dej molecules uas ua rau qis kub degradation dhau kev siv sijhawm ntev.; Saint-Gobain ZirPro's ZTA ceramic's sintering txheej txheem tau tsim tshwj xeeb kom tsis txhob muaj qhov tshwm sim tsis zoo.. Luckily Saint-Gobain ZirPro ceramic's ZTA ceramic yog tsim tshwj xeeb los tiv thaiv cov xwm txheej zoo li no. –

Thermal stability

Zirconia Toughened Alumina (ZTA) tuaj yeem tiv taus kev hloov pauv sai hauv qhov kub thiab txias yam tsis muaj kev tawg lossis tawg, ua tsaug rau zirconia hais dispersed nyob rau hauv ib tug alumina matrix absorbing tshav kub zog thiab tsim compressive kev nyuaj siab uas tiv thaiv cracking thiab tsis ua hauj lwm.. Vim tias ZTA absorbs thermal zog thiaj li zoo, cov khoom siv no ua rau kev xaiv zoo heev rau cov ntawv thov uas xav tau qhov kub thiab txias.

Ntxiv ntawm zirconia rau alumina matrix tuaj yeem ua rau cov pob txha toughness thaum ib txhij txhim kho cov khoom siv zoo li lub zog thiab hnav tsis kam.. Qhov nce pob txha toughness hauv ZTA yog tshwm sim los ntawm kev ntxhov siab vim kev hloov pauv los ntawm metastable tetragonal theem mus rau theem monoclinic ntawm ambient kub.; cov nyhuv amplified los ntawm cov zirconia me me ntau dua li cov hauv alumina.

Stabilizers nquag ua haujlwm los khaws cov theem tetragonal zirconia hauv ZTA cov ntaub ntawv xws li Biolox Delta; txawm li cas los xij, Cov txiaj ntsig zoo sib xws tuaj yeem ua tiav yam tsis muaj stabilizers nyob rau hauv cov nqe lus ntawm particle tis thiab tawg toughness.

Kev sib xyaw ua ke ntawm alumina thiab zirconia tsim cov ceramics uas muaj zog heev, tawg toughness, elasticity thiab hardness – Cov yam ntxwv tseem ceeb rau cov ntawv thov uas xav tau cov qauv kev ua haujlwm thiab kev tiv thaiv corrosion. ZTA ceramics nyiam tshaj tawm 99% alumina ceramics ntawm tus nqi-zoo thaum ntsib cov ntawv thov tshwj xeeb xav tau ntau dua; lawv qhov piv kuj tseem tuaj yeem kho tau tshwj xeeb.