Zirconia Toughened Alumina – Txhim kho lub zog rau Industrial Excellence

Zirconia Toughened Alumina (ZTA) yog ib qho tshwj xeeb ceramic, Qhov txawv los ntawm siab toughness thiab tawg tsis kam vim yttria stabilized zirconia hais dispersed los ntawm alumina matrix.

Cov khoom siv no tuaj yeem tiv taus qhov kub thiab txias hloov tsis tau tawg lossis tawg, resists tshuaj corrosion thiab muaj zoo heev thermal shock kuj.

Zoo heev Corrosion Resistance

ZTA ceramics muab qhov zoo sib npaug ntawm lub zog thiab tus nqi, ua kom muaj zog dua li cov khoom siv alumina tab sis tus nqi qis dua cov zirconia ntshiab. Lawv mechanical zog – tawg toughness, flexural zog thiab hardness nrog rau thermal shock kuj – ua kom lawv tsim nyog rau kev tsim cov cuab yeej xws li txiav lub log.

ZTA ua tiav nws cov khoom zoo tshaj vim qhov sib ntxiv ntawm yttria stabilized zirconia (YSZ) nyob rau hauv ib tug alumina matrix. Thaum dispersed tusyees thoob plaws, YSZ pab txhim kho ob qho tib si hardness-pob txha toughness thiab tensile lub zog ntawm ob lub ntsiab uas ua rau tshwj xeeb hnav tsis kam., chemical inertness nyob rau hauv chav tsev kub thiab kub hardness / zoo zog lub zog rau ib tug tshwj xeeb ceramic khoom.

ZTA cov khoom’ mechanical zog nyob ntawm ntau yam ntawm lawv txoj kev ua cov hmoov nplej, suav nrog kev kho cua sov, calcination txoj kev, Cov txheej txheem kom qhuav thiab sintering txheej txheem nrog rau kev ua kom zoo nkauj nrog cov khoom ntxiv ntxiv thaum tsim khoom. Tag nrho cov xwm txheej no muaj kev cuam tshuam tam sim ntawm lawv lub zog, elasticity thiab hardness zog.

Zoo heev Thermal Shock Resistance

ZTA ceramics muab cov thermal poob siab zoo heev, ua rau lawv qhov kev xaiv zoo tshaj plaws rau kev siv aerospace uas xav tau qib siab ntawm lub zog, tawv, thiab chemical inertness. Thaum dispersed uniformly nyob rau hauv ib tug alumina matrix YSZ yuav optimized. Ib qho kev hloov pauv-toughened zirconia-alumina ceramic uas peb muab yog BIOLOX delta uas tuaj yeem pom siv rau orthopedais load-bearing Cheebtsam xws li lub duav hloov..

Kev ntxhov siab vim kev hloov pauv los ntawm metastable tetragonal mus rau monoclinic qauv ntawm YSZ tsim ntim nthuav dav thiab shear strain uas tawm tsam tawg., nce pob txha toughness thaum ib txhij txhim kho flexural zog. Kev ua tau zoo ntawm xws li alumina-YSZ transformation-toughened ceramic yog nyob ntawm kev ua haujlwm nrog rau nws cov stoichiometry ntawm cov khoom siv oxides hauv cov txheej txheem sintering..

Kev tswj tsis zoo sintering tej yam kev mob yuav ua rau tsis muaj zog flexural thiab tsis zoo homogeneity ntawm alumina-YSZ matrix, tej zaum vim huab cua entrapment los yog particle agglomeration. Los ntawm kev ntxiv cov khoom ntxiv xws li yttria lossis magnesium oxides, ib tug yuav txo tau tetragonal rau monoclinic transformation kub thiab txhim khu zirconia lub sintering zog.

Zoo heev hnav tsis kam

ZTA tsis tsuas yog ua tau zoo nyob rau hauv cov nqe lus ntawm thermal shock kuj thiab corrosion kuj, tab sis kuj tseem hnav resistant vim nws tetragonal-monclinic theem transformation encasing mechanism. Tsis tas li ntawd xwb, Cov kev tshawb fawb hauv vitro tau qhia tias ZTA Cheebtsam tsis tshua muaj kev cuam tshuam rau hydrothermal degradation – ib yam dab tsi ntawm qhov tseem ceeb hauv lub duav hloov femoral taub hau thiab khob ceramics (xws li BIOLOX delta tsim los ntawm CeramTec).

Simulated coj mus kuaj ua nyob rau hauv ZTA Cheebtsam ua los ntawm alumina-zirconia composite cov ntaub ntawv tau ua impressive tau nyob rau hauv cov nqe lus ntawm hnav tsis kam., flexural zog thiab hardness. ZTA cov qauv raug rau ntau lub voj voog nyob rau hauv lub duav simulator pom qhov tsawg kawg nkaus degradation nrog qis nto roughness dua li monolithic zirconia Cheebtsam..

ZTA Cheebtsam tau ua pov thawj tsim nyog rau kev thov hauv kev tsim tsheb (kub thiab txias txoj kev tooling, tuaj yeem kaw rollers thiab capstans); kev lag luam hluav taws xob (bearings, orifice inserts thiab vortex finders); kev ua zaub mov (homogenizing twj tso kua mis); thiab kev lag luam hluav taws xob. Lawv mechanical zog nyob ntawm ntau yam sib txawv: kev npaj siv los npaj hmoov; Txoj kev ziab kom qhuav ua haujlwm thaum calcination; shaping cov txheej txheem tau txais thaum lub sij hawm sintering cov txheej txheem; haum shaping; additives ntxiv thiab particle loj faib ntawm lwm tus.

Lub zog zoo heev

ZTA ceramics siv kev ntxhov siab vim kev hloov pauv los ua ke zirconia rau hauv alumina matrix, nce lub zog thiab durability nyob rau lub sij hawm. Qhov no ua rau ZTA yog ib qho kev daws teeb meem zoo heev rau cov ntawv thov kev lag luam uas yuav tsum tau ua kom muaj zog, siab corrosion kuj, thermal shock kam rau ua thiab thermal shock kam rau ua.

Hauv qab strain, tetragonal metastable precipitates nyob rau hauv cubic alumina undergo ib tug abrupt transformation rau hauv monoclinic hais uas ua rau nws tawg toughness los ntawm tsim compressive nto txheej uas ua raws li cov kab nrib pleb nyob rau hauv nws cov matrix..

Transformation toughening yog ib qho tshwm sim hu ua tawg toughening, nyob rau hauv qhov nce pob txha toughness ntawm alumina ua rau luv luv tawg ntev, tsawg tawg blunting, thiab txhim kho kev sib cuam tshuam nrog microcracks preexisting. Qhov no tso cai rau nyuaj-rau-nyuaj thiab nyuaj-rau-mos cov kabmob sib xyaw ua ke uas tau siv rau hauv kev kho mob niaj hnub-qib ceramics xws li hloov lub duav. Tsis tas li ntawd xwb, Yttrium stabilized zirconia implants hu ua y-TZP muab kev tiv thaiv los ntawm hnav dhau sijhawm.