Advanced Toughness rau Industrial Applications

Zirconia Toughened Alumina (ZTA) ceramic Cheebtsam muab cov hardness thiab lub zog ntawm alumina nrog zirconia lub superior puas toughness kom xa cov kev ua tau zoo thiab ntev rau kev lag luam kev siv..

Kev ntxhov siab vim kev hloov pauv ntawm cov nplua tetragonal zirconia hais nyob rau hauv ib qho alumina matrix ua rau ZTA cov ntaub ntawv nrog superior zog thiab toughness., haum rau siv nyob rau hauv ntau yam hnyav ib puag ncig.

Toughness

ZTA cov ntaub ntawv muab cov hardness ntawm alumina nrog zirconia lub toughness rau unparalleled tsis kam mus hnav thiab puas.. Cov nyhuv no yog ua tau los ntawm kev ntxhov siab-induced transformation toughening: thaum ntxhov siab, zirconia hais hloov ntawm lawv cov metastable tetragonal theem mus rau hauv daim ntawv ruaj khov monoclinic; ntim nthuav dav tshwm sim los ntawm qhov kev hloov pauv ntawm cov qauv no pab kaw cov kab nrib pleb hauv ib qho alumina matrix thiab nce toughness..

ZTA muaj zirconia platelets uas nucleate rau hauv alumina matrix thaum sintering, txhim kho pob txha toughness thiab lub zog thaum nce pob txha toughness, tsim cov khoom uas muaj zog flexural ntau dua li Y-TZP thiab mus txog ob zaug nws lub zog qaug zog. Qhov kev sib xyaw ua ke ntawm toughness los ntawm alumina ua ke nrog zirconia lub zog ua rau ZTA ib qho kev xaiv zoo heev rau cov ntawv thov kev lag luam uas xav tau kev puas tsuaj..

Durability

Zirconia Toughened Alumina (ZTA) boasts zoo heev flexural thiab compressive zog, nrog tsawg thermal expansion sib npaug ntawm alumina thiab zoo heev hnav tsis kam.

Zirconia toughened alumina yog tsim los ntawm kev ntxiv tetragonal zirconia nplej los ntawm kev ntxhov siab vim kev hloov pauv mus rau ib qho nyuaj alumina matrix, encasing lawv mus rau hauv nws cov qauv thaum txwv lawv cov kev hloov pauv mus rau cov cheeb tsam hauv zos es tsis txhob kis thoob plaws.

Cov txheej txheem no ua rau alumina-zirconia composites nyob deb dua li cov monolithic zirconia vim lawv tsis kam mus rau dej nqus los ntawm chemisorption.; monolithic zirconia tuaj yeem nqus dej polar molecules uas ua rau qhov kub thiab txias degradation thiab nws thiaj li tawg tom qab siv ntev..

ZTA, ntawm qhov tod tes, yog tsim tshwj xeeb los pab txhawb qhov kev hloov pauv ntawm tetragonal-rau-monoclinic los ntawm cov qauv nta thiab cov tshuaj ntxiv.. CeramTec ua lag luam Biolox Delta ZTA ua piv txwv; no formulation muaj yttria thiab strontium aluminate los pab txhawb toughening mechanisms nyob rau hauv nws cov zirconia theem thiab thiaj li muaj tsawg txaus ntshai ntawm tsis kub degradation thaum withstanding kub ib puag ncig..

Corrosion Resistance

ZTA ceramics muaj kev tiv thaiv corrosion zoo tshaj lawv cov alumina counterparts thiab yog li ntawd tuaj yeem siv rau hauv cov khoom siv rau qhov chaw hnyav.. Tsis tas li ntawd xwb, ZTA tuaj yeem tiv taus qhov kub thiab txias dua thaum muab tshuaj lom neeg ruaj khov dua.

Garvie et al (1975) qhia tias ntxiv 10-20% unstabilized zirconia tuaj yeem txhim kho toughness piv rau alumina, los ntawm transformation toughening. Cov txheej txheem no tshwm sim thaum finely dispersed tetragonal metastable precipitates hloov mus rau hauv monoclinic zirconia nyob rau hauv kev ntxhov siab ua rau ntim expansion uas compresses tawg thiab slows los yog nres lawv propagation..

Cov txheej txheem no zoo ib yam li cov deformation-induced stresses; txawm li cas los xij, nyob rau hauv thiaj li yuav ua rau cov theem hloov qhov kev nyuaj siab teb yuav tsum loj txaus; rau cov kab nrib pleb hauv ZTA cov qauv no lub zog los ntawm kev khoov kev ntxhov siab ntawm qhov chaw tawg.

Thaum tshav kub kub Resistance

Zirconia Toughened Alumina boasts qhov tshwj xeeb siab melting point thiab corrosion kuj, ua rau nws yog cov khoom siv zoo tshaj plaws rau cov khoom siv feem ntau raug rau qhov kub thiab txias. Tsis tas li ntawd xwb, no variant muaj kev sib txhuam ntau dua li cov qauv alumina, pab txo qhov hnav thiab tsim kua muag ntawm cov cuab yeej raug rau qib siab ntawm lub zog kinetic.

ZTA ceramics yog tsim los ntawm kev ntxhov siab vim kev hloov pauv ntawm tetragonal zirconia hais rau hauv alumina matrix, tsim compressive kev nyuaj siab nyob rau hauv lawv uas tiv thaiv tawg propagation, nce ob qho tib si lub zog thiab toughness thaum muab thermal shock kuj tsis tawg lossis tawg. Lawv khav theeb zoo heev thermal shock tsis kam; tiv thaiv kev hloov pauv sai hauv qhov kub thiab txias yam tsis muaj kev puas tsuaj lossis tawg thaum muaj kev ntxhov siab.

Zirconia-toughened alumina muaj ntau yam siv thoob plaws ntau qhov kev lag luam vim nws cov khoom loj heev. Mechanical engineering siv nws rau cov twj tso kua mis thiab cov ntsaws ruaj ruaj; semiconductor ua siv nws vim nws thermal stability thiab lub zog; aerospace, Automotive thiab fais fab kev lag luam siv nws li cav qhov chaw vim nws tsis kam tiv thaiv corrosion thiab hnyav tshuaj; nws tuaj yeem tiv taus siab flexural zog rau kev cog hniav!