Zirconia Toughened Alumina

Alumina-zirconia composites yog hardened los ntawm kev ntxhov siab vim kev hloov pauv ntawm cov nplua tetragonal zirconia hais rau hauv ib qho nyuaj., muaj zog cov ntaub ntawv uas muaj zog heev thiab toughness uas ua rau lawv haum rau ntau yam kev siv thiab ib puag ncig.

Gelcasting tau siv los tsim cov qauv ZTA, nrog ceev faj them rau optimizing slurry npaj nrog sib txawv khoom loadings, molding thiab de-moulding txheej txheem, kuab tshuaj kom qhuav (osmotic tiv thaiv huab cua kom qhuav), thiab pyrolysis thiab sintering txheej txheem ntawm 1550 thiab 1650 degC rau ziab kom qhuav. Qhov ntom, tawv, Kev ntsuam xyuas lub zog ntawm kev sib txhuam thiab kev ua kom muaj zog flexural tau ua tiav ntawm txhua qhov qauv tsim siv gelcasting.

Nws muaj ib tug siab hardness

Zirconia toughened alumina (ZTA) yog qhov zoo tagnrho rau kev thov kev thov vim nws qhov siab hardness. Fabricated siv gel casting, ZTA muab cov nqi txuag dua lwm cov ntaub ntawv ceramic thaum khav theeb zoo dua. ZTA tuaj yeem tiv taus qhov kub thiab txias 1650 degC thaum tseem tshuav nqi zoo vim yog muaj cov hmoov ntawm yttria-stabilized zirconia thiab alumina uas tau ua ke siv gel casting thiab sintering cov tswv yim.

ZTA ceramics sawv tawm vim lawv qhov zoo tshaj plaws toughness vim nws kev hloov ntawm tetragonal mus rau monoclinic theem, nce pob txha toughness los ntawm ntau npaum li ob. Qhov no mechanism yog tshwm sim los ntawm qhov sib txawv ntawm lawv elastic modulus ntawm lawv cov theem – zirconia thiab alumina feem – Lub ntsiab lus kev ntxhov siab tsim thaum lub sij hawm hloov pauv tau ua kom txo tau cov kab nrib pleb tawm ua ZTA ntau dua li cov tsoos alumina ceramics.

Zirconia-toughened alumina boasts superior hardness thiab puas toughness tshaj AlN, nrog rau superior flexural zog piv rau ob qho tib si ntawm cov ntaub ntawv, ua rau nws yog tus neeg sib tw zoo tshaj plaws rau kev siv tsheb thiab kev siv hluav taws xob ruaj khov. Tsis tas li ntawd xwb, ZTA nta superior thermal shock kuj nrog rau cov hluav taws xob rwb thaiv tsev zoo, ua kom haum rau kev siv tsheb thiab lwm yam kev siv kho mob; ntxiv lawm, ZTA tsis pom DNA puas tsuaj los yog mob qog noj ntshav hauv cov hlwb mammalian, muab lub peev xwm siv los ua cov khoom siv kho hniav vim nws cov khoom siv zoo heev thiab cov khoom siv biocompatibility.

Nws muaj lub siab toughness

Zirconia toughened alumina (ZTA), los yog zirconium toughened alumina, yog cov khoom siv ceramic tsim los ntawm ob qho tib si alumina thiab zirconium uas muaj cov cuab yeej tshwj xeeb xws li siab flexural toughness, tawg toughness, elasticity, hardness thiab hnav tsis kam. Qhov piv ntawm cov ntaub ntawv no tuaj yeem hloov kho tau yooj yim kom tau raws li cov ntawv thov tshwj xeeb; ZTA cov khoom lag luam outshone cov ua nrog ntshiab zirconia thaum ua tau zoo dua.

Cov khoom siv no tau siv tau zoo hauv kev hloov lub duav femoral taub hau thiab acetabular liners vim nws cov biocompatibility thiab lub sij hawm ntev load bearing peev xwm.. Txawm li cas los, nws qhov tsim nyog yuav tsum tau ntsuas ua ntej hauv vivo.

ZTA ua tiav qhov siab tawv vim nws cov qauv metastable tetragonal thiab compressive quab yuam los ntawm alumina matrix, qhov twg high tensile stresses ua transformation toughening; uas yog, zirconia hloov mus rau monoclinic cov ntaub ntawv thaum raug compression rog los ntawm alumina matrix, ua kom muaj zog kev ntxhov siab uas qeeb los yog nres tawg propagation li no ua transformation toughening teebmeem uas tiv thaiv tawg propagation.

ZTA boasts ho txhim kho flexural zog dhau 99% alumina ceramics vim nws metastable tetragonal theem thiab alumina matrix, tseem ceeb outstripping nws nyob rau hauv no hais txog. Txawm li cas los, alumina-zirconia composites yuav ua nkig vim qis homogeneity thiab cua nkag nrog rau particle agglomeration ua rau taw tes tsis xws luag thiab tsis muaj zog flexural. – tsis tau nws qhov kev ua tau zoo tshaj cov tsoos alumina ceramics hauv kev kho mob thiab kev lag luam kev siv tib yam.

Nws muaj lub zog siab

Zirconia toughened alumina yog cov khoom siv ruaj khov heev, uas ua rau nws haum rau kev siv load-bearing. Ua los ntawm kev ntxhov siab vim kev hloov pauv ntawm cov nplua tetragonal zirconia hais rau hauv alumina matrix, nws cov khoom ua tau zoo sib xws particle faib nrog tshwj xeeb lub zog thiab toughness zog.

Ceramic kuj tseem tiv taus tshuaj corrosion. Nws yog qhov tsim nyog rau kev siv ntau yam suav nrog kev cog qoob loo kho mob thiab cov ntaub ntawv kho hniav vim nws muaj peev xwm tiv taus cov dej hauv lub cev thiab tshuaj lom neeg..

ZTA kuj sawv tawm nrog nws cov thermal shock kuj, Raws li nws cov zirconia hais dispersed nyob rau hauv ib tug alumina matrix nqus thermal zog thiab tsim compressive kev nyuaj siab kom tsis txhob tawg tsim. – Qhov no tso cai rau ZTA ceramic kom muaj kev nyab xeeb siv rau cov ntawv thov kub xws li cov khoom siv hluav taws xob thiab cov tshuab cav cav yam tsis muaj kev pheej hmoo lossis tsis ua haujlwm..

ZTA muab nws lub zog los ntawm nws cov qauv thiab nanoparticle faib, nrog rau kub isostatic nias thiab pa sintering kom muaj kev ntseeg siab. Rau ntxiv yooj, Nws kuj tseem yuav raug tsim los siv cov txheej txheem sol-gel fabrication uas hloov cov molecules rau hauv cov khib nyiab – Hauv qhov piv txwv no sib txuas cov hmoov alumina thiab zirconia hmoov hauv cov kua zoo li gel uas tuaj yeem tsim ua ntau hom ua ntej yuav ci hauv qhov cub kom txog thaum kho tau qhov chaw ua ntej de-moulded thiab qhuav kom yield ZTA nrog siab ntom ntom zoo siv lead ua qauv nrog rau kev hloov pauv siv lead ua., atomic, hluav taws xob lub xeev uas ua rau ZTA uas nthuav tawm siab ceev thiab hloov pauv siv lead ua, atomic states thiab hloov cov qauv siv lead ua, Hloov cov qauv siv lead ua zoo li hloov pauv siv lead ua, atomic xeev ua rau hloov pauv siv lead ua, atomic states kom muaj kev ntseeg siab.

Nws muaj qhov kub thiab txias tsis kam

ZTA cov khoom muaj kev kub siab ua haujlwm zoo, ua rau nws haum rau daim ntaub ntawv xav tau huab durability. Tsis tas li ntawd xwb, nws cov corrosion-ua hauj thiab siab zog flexural ua ZTA haum rau lub sij hawm ntev raug kub mus txog rau 1773 K – ua rau nws yog qhov kev xaiv zoo tshaj plaws rau cov khoom siv mus sij hawm ntev raug rau cov cua sov siab.

Kev tshawb fawb tsis ntev los no qhia tias zirconia txhim kho cov khoom siv ntawm alumina, tshwj xeeb tshaj yog nws toughness thiab flexural zog. Cov nyhuv no tshwm sim vim hais tias zirconia hais txog compressive kev nyuaj siab ntawm alumina matrix thaum muaj kev ntxhov siab; Qhov kev ntxhov siab compressive no pab txo qis kev nthuav tawm thaum tib lub sijhawm ua kom tawg toughness.

Ntau yam cuam tshuam rau kev ua haujlwm ntawm ZTA composites, xws li nws txoj kev sintering thiab kub nrog rau cov nyiaj zirconia ntxiv. Feem ntau, Ntxiv zirconia ntau dua los txhim kho kev ua haujlwm; Txawm li cas los xij ntau dhau zirconia tuaj yeem txo nws lub zog flexural nrog rau pob txha toughness.

Alumina-zirconia-toughened alumina (Tias) yog ib qho kev tshaj lij cov khoom siv ceramic siv hauv ntau daim ntawv thov kev lag luam. Tsim los ntawm alumina thiab zirconium oxide txuas nrog cov ntawv cog lus ceramic uas txhim kho lub zog flexural thiab tawg toughness ntawm cov khoom, AZT ua rau cov khoom siv zoo heev rau cov tshuab raug rau qhov kub thiab txias xws li qhov cub thiab qhov cub.