zirconia toughened alumina tau ua pov thawj nws cov khoom zoo tshaj plaws piv rau monolithic zirconia, nrog rau pob txha toughness thiab flexural zog. ZTA qhov kev ruaj ntseg stems los ntawm nws cov theem matrix uas tiv thaiv thiab txwv kev hloov pauv ntawm tetragonal zirconia nplej., pab nws tiv taus degradation nyob rau hauv-vivo hydrothermal tej yam kev mob.
Flexural zog
Los ntawm kev ntxiv zirconia rau alumina ceramics, zirconia toughened alumina yog tsim. Cov khoom no nta superior flexural zog thiab mechanical durability nyob rau hauv cov xwm txheej uas xav tau nws, thiab tseem tiv thaiv cov tshuaj tiv thaiv corrosion zoo li raug rau lub cev kua.
zirconia toughened alumina tuaj yeem tiv taus qhov hloov pauv sai ntawm qhov kub thiab txias vim nws cov zirconia cov khoom tawg nyob rau hauv ib qho alumina matrix absorbing thermal zog thiab tsim compressive kev ntxhov siab los tiv thaiv kev tawg., ua rau nws haum rau siv nyob rau hauv ntau yam kev lag luam daim ntawv sau npe xws li cov khoom siv hluav taws xob thiab cov cav turbine.
Qhov sib xyaw ceramic no muab cov txiaj ntsig zoo ntawm ob qho tib si alumina thiab zirconia kom xa cov zog ntxiv thiab thermal poob siab., nrog superior hardness, flexural zog, tawg toughness thiab hnav tsis kam uas tshaj 99% ntshiab alumina nyob rau hauv cov nqe lus ntawm hardness, toughness thiab hnav tsis kam.
Fracture Toughness
Zirconia txhim kho cov pob txha toughness ntawm alumina ceramics los ntawm kev hloov pauv toughening. Thaum ntaus, metastable yttrium-stabilized zirconia transforms rau hauv monoclinic siv lead ua qauv uas tsim compressive kev nyuaj siab uas tiv thaiv tawg propagation.
Zirconia toughened alumina yog cov khoom siv zoo tshaj plaws rau kev tsim cov cuab yeej txiav vim nws qhov nyuaj, thermal stability thiab tiv thaiv kev sib txhuam. Tsis tas li ntawd xwb, nws superior mechanical zog pab txhawb rau nws durability thiab kev cia siab rau.
ZTA tsim los ntawm gelcasting muaj qhov tshwj xeeb ua ke ntawm flexural zog, tawg toughness, biocompatibility thiab tshav kub / corrosion kuj uas ua rau nws haum rau kev phais hloov duav. Los ntawm cov txheej txheem gelcasting nws kuj tseem tuaj yeem kho nws cov tawv tawv-pob txha toughness-flexural zog tsis tau los ntawm kev hloov slurry khoom thauj khoom qib., pwm thickness los yog sintering kub tsis ua kom pom tseeb.
Stress-Stress Curves
zirconia toughened alumina khoom boasts superior zog thiab hnav tsis kam, nrog rau qhov tshwj xeeb rigidity rau kev txhawb nqa hnyav yam tsis muaj deforming nyob rau hauv siab. Tsis tas li ntawd xwb, nws boasts zoo heev thermal poob siab tsis kam ua rau nws zam tam sim ntawd hloov nyob rau hauv qhov kub thiab txias yam tsis muaj kev txom nyem degradation..
Zirconia cov ntsiab lus saum toj ib qho kev txwv nce kev laus zuj zus los ntawm microcracks tsim thaum lub caij txias tom qab sintering uas ua raws li txoj kev nyiam rau dej nkag mus rau hauv cov khoom siv ceramic., ua rau microcracks raug tsim thaum lub caij txias uas ua raws li txoj hauv kev nyiam rau nws nkag mus thiab kis mus rau hauv nws.. Hloov pauv, Thaum qis dua qhov pib no, cov zirconia hais txog kev ntxhov siab vim kev hloov pauv ntawm tetragonal theem mus rau theem monoclinic uas txo cov kev laus degradation..
Tensile zog
Zirconia toughened alumina yog cov khoom siv tawv thiab ruaj khov nrog kev hnav zoo heev thiab thermal stability, ua kom haum rau cov khoom uas xav tau kom txias. Ntxiv thiab, thermally ruaj khov nto zoo li no muab thermal tswj nrog rau kev sib txhuam tsis kam ua rau lawv xaiv cov khoom siv zoo tagnrho.
Hauv kev ntxhov siab, ZTA tau dhau los ua ib theem kev hloov pauv ntawm tetragonal mus rau monoclinic uas tiv thaiv kev tawg tawm thiab ua rau kom pob txha toughness., tab sis qee qhov kev tshawb fawb qhia tias kev ua kom tsis ruaj khov zirconia ua rau txo lub zog tensile.
ZTA ceramics feem ntau muaj 10%-20% zirconia, uas tso cai rau nws los tsim tshwj xeeb rau txhua daim ntawv thov. ZTA yog biocompatible, kub resistant, corrosion-resistant, tawv txaus kom tiv taus siab, nqi-zoo lwm txoj rau ntshiab zirconia ceramics thiab tuaj yeem tiv taus qhov kub thiab txias yam tsis muaj degradation. Valve foob manufacturers feem ntau xaiv nws vim nws corrosion-ua hauj thiab siab-tuav lub peev xwm – tag nrho cov zoo tagnrho rau daim ntawv thov valve seal.
Kev cuam tshuam lub zog
zirconia toughened alumina yog heev corrosion-resistant thiab muaj exceptional txhua yam zog, ua rau lawv haum rau daim ntaub ntawv uas yuav tsum tau hardness thiab toughness ib txhij. Tsis tas li ntawd xwb, ZTA muab cov nqi txuag tshaj cov ntshiab zirconia ceramics.
Kev sib xyaw alumina thiab zirconia tsim cov ceramic nrog ntau zog flexural, tawg toughness, thiab hnav tsis kam tshaj alumina ntshiab. Nws tuaj yeem tiv taus ntau dua thiab cuam tshuam thiab feem ntau yog siv los ua kev hloov kho dua tshiab ntawm cov qauv alumina hauv cov qauv tsim uas xav tau cov yam ntxwv ntxiv.
Transformation toughening nyiaj rau qhov muaj zog ntxiv; nyob rau hauv kev nyuaj siab, zirconia hais hloov los ntawm lawv cov tetragonal mus rau monoclinic zoo thiab nthuav, compressing tawg nyob rau hauv ib tug alumina matrix thiab yog li ua rau siab flexural zog tshaj YSZ (Daim duab 6c thiab d).
Corrosion Resistance
ZTA ceramics ua ke ntawm alumina thiab zirconia muab superior corrosion kuj piv rau cov ntshiab 99% cov ntaub ntawv alumina ib leeg, thiab muaj superior hardness, tawg toughness, flexural zog, thiab hardness zog tshaj nws cov neeg sib tw.
ZTA nta zoo heev hnav thiab abrasion kuj thiab tshuaj lom neeg compatibility, ua rau nws zoo tagnrho rau cov ntawv thov kev lag luam uas xav tau cov tshuab ua haujlwm siab. Tsis tas li ntawd xwb, kev sib xyaw ua ke ntawm cov ntaub ntawv boasts zoo heev thermal shock kuj tso cai rau kub hloov ceev yam tsis muaj cracking los yog tawg.
Zirconia hais ntxiv rau alumina matrix nce nws cov pob txha toughness los ntawm kev hloov pauv toughening, Cov nyhuv tshwm sim los ntawm kev ntxhov siab zirconia hais tias hloov los ntawm tetragonal mus rau monoclinic siv lead ua qauv thaum raug kev nyuaj siab compressional, ua compressive kev nyuaj siab uas inhibit tawg propagation thiab ho nce nws puas toughness.
Thermal Shock Resistance
zirconia toughened alumina yog ib qho khoom siv siab heev uas ua ke nrog alumina thiab zirconia. Tsim ZTA, zirconia yog nkag mus rau hauv lub ntsiab alumina matrix ua ntej sintering rau ntxiv zog thiab thermal shock tsis kam tshaj cov tsoos alumina ceramics; Tsis tas li ntawd nws boasts dua hardness, flexural zog, thiab ceev tshaj nws counterpart.
ZTA toughening mechanism suav nrog kev ntxhov siab vim kev hloov pauv ntawm tetragonal mus rau monoclinic zirconia particle siv lead ua qauv, nce pob txha toughness thaum tiv thaiv nws los ntawm thermal shock thiab mechanical abrasion. zirconia toughened alumina yog heev biocompatible thiab tsis corrode sai, ua rau nws zoo tagnrho rau valve seals. Tsis tas li ntawd xwb, nws lub zog flexural siab tso cai rau nws tiv taus lub cev siab zoo.