Zirconium oxide thiab txhuas oxide muab tso ua ke tawm los Zirconia Toughened Alumina (ZTA), ib qho khoom tshwj xeeb hauv ntau daim ntawv thov. Mechanical zog, zog, tawg toughness, elasticity, hardness thiab hnav tsis kam yog qhov txaus siab heev hauv cov khoom siv ceramic uas yog nyob rau hauv chav kawm ntawm AZ composites.. ZTA tau dhau los ua qhov kev xaiv zoo tshaj plaws rau kev siv tshuab ua haujlwm siab, thermal kuj thiab corrosion kuj.
Kev txiav txim siab ntawm Cov Qauv thiab Cov Qauv
Ntawm lwm yam, Zirconia Toughened Alumina muaj zirconia nplej dispersed uniformly nyob rau hauv ib tug alumina matrix. Nquag, qhov no suav nrog 10-20% Qhov ntim ntawm ZrO2 hauv alumina. Nyob ntawm lawv proportions, Cov khoom sib xyaw ua ke pab txhawb rau ceramics nrog cov yam ntxwv tshwj xeeb nyob ntawm ib qho kev thov tshwj xeeb.
Tsev Blocks: Alumina thiab Zirconia
Cov khoom tseem ceeb uas sib xyaw ua ZTA yog alumina thiab zirconia. Ntxiv mus, Orthopedic implants tau siv cov khoom siv ceramic hu ua Aluminium Oxide (Al2O3) nyob rau hauv keeb kwm vim nws zoo biocompatibility nrog rau nws zoo heev mechanical zog thiab tawg tsis kam.
Lwm cov cuab yeej zoo ntawm zirconia yog nws cov nqi qis ntawm corrosion nrog rau cov tshuaj lom neeg ruaj khov thiab muaj zog txhua yam. Nws Young's modulus yog nyob rau hauv tib qhov kev txiav txim ntawm qhov loj me nrog stainless hlau alloys.
Yuav Ua Li Cas
Los tsim ZTA txhais tau tias tsim tetragonal-theem zirconia nplej sib xyaw ua ke thoob plaws hauv alumina matrix. Ib qho kev nyuaj siab ntxhov siab tuaj yeem hloov pauv cov qauv siv lead ua tetragonal rau hauv ib qho monoclinic yog li ua rau muaj kev cuam tshuam rau qhov ntim ntawm zirconia.. Xws li ntim expansion zoo thim rov qab lossis nres qhov kev loj hlob ntawm kev tawg ua rau muaj zog dua thiab muaj zog.
Mechanical Properties ntawm ZrO2-Al2O3 Ceramics
Muaj ntau yam khoom siv kho tshuab nthuav tawm los ntawm ZTA suav nrog kev ua haujlwm zoo dua li cov pa aluminas nrog cov txiaj ntsig zoo sib xws., siab zog flexural dua li cov pa aluminas thiab qis dua cov pa zirconia coefficient ntawm linear thermal expansions (CLTE).
Zirconia Toughened Alumina muaj lub zog txhua yam thiab yog thermally resistant li no nws tsis corrode.. Hauv qab no yog qee yam ntawm ZTA cov khoom:
Tus nqi vaj tsev
Tshuaj Formula Zr-Al2O3
Qhov ntom 4.1-4.38 g/cm^3
Hardness 1750-2100 Khawm
Elasticity 45-49 x 10^6 psi
Flexure zog 100-145 ksi ua
Poisson tus ratio 0.26
Fracture Toughness 5-7 MPa m^1/2
Coefficient ntawm Thermal Expansion 8.0-8.1 x 10^-6 1/C
Thermal conductivity 20.0-21.0 W/mK
Shock Resistance 325 °C
Ua haujlwm kub siab tshaj plaws 1650 °C
Kev siv ntawm ZrO2-Al2O3 Ceramics
Zirconia Toughened Alumina yog siv rau hauv ntau daim ntawv thov xws li cov uas yuav tsum tau muaj zog thiab hnav tsis kam. Cov no muaj xws li valve seals, tes tsho, twj pistons, spraying nozzles thiab lwm yam khoom siv.
Biocompatibility ntawm ZTA
Hauv ntau yam kev tshawb fawb, ZTA tau raug tshaj tawm tias tsis muaj qhov tsis zoo ntawm cov ntaub so ntswg thaum cog yog li ua rau nws yog tus neeg sib tw zoo rau orthopedic load-bearing Cheebtsam.. Ntxiv rau, lub hardness, toughness thiab lub zog nthuav tawm los ntawm zirconia-alumina ceramics ua rau lawv haum rau orthopedic load-bearing Cheebtsam.
ZTA hauv Hip Arthroplasty
Muaj ntau qhov kev txiav txim siab ntawm ceramics zoo li alumina, zirconia thiab zirconia toughened alumina (ZTA) raws li cov ntaub ntawv tsim nyog hauv hip arthroplasty . Cov txiaj ntsig zoo ntawm ZTA tau ua tiav yam tsis tas yuav suav nrog qhov tsis zoo cuam tshuam nrog yttria-stabilized zirconia uas nthuav tawm cov khoom siv tshuab siab lossis alumina nrog nws qhov siab inertness..
ZTA hauv Knee Arthroplasty
Feem ntau, ceramic implant tsim rau tag nrho lub hauv caug arthroplasty (TKA) tau tsim los daws qhov teeb meem ntawm kev tsis haum tshuaj uas yuav tshwm sim hauv cov neeg mob thaum niaj hnub titanium los yog cobalt-chromium alloy cov khoom tso tawm cov khoom hnav.. Zirconia Toughened Alumina (ZTA) Matrix Composite yog cov khoom siv biomaterial rau cov ntawv thov zoo li no.
ZTA: Kev Cia Siab Yav Tom Ntej
Qhov no suav nrog kev tshawb fawb txuas ntxiv nrog rau kev txhim kho ntawm txoj hauv kev txhim kho ZTA tus cwj pwm thiab nws cov peev xwm siv tau. Lwm batch-processed Zirconia Toughened Alumina tau raug tsim los nrog txhua yam khoom nyob rau hauv cov nqe lus ntawm flexural lub zog tsis tshua muaj tsawg tshaj li cov khoom muag Biolox® Delta.. Lwm tus, xws li silicon nitride ceramics composites qhia tsis ntev los no rau hauv hip arthroplasty kuj nthuav tawm lub zog ntau dua li alumina.Lub neej yav tom ntej yog ci rau ZTA nrog ntau daim ntawv thov thiab cov khoom zoo tshaj.. Yog li ntawd, nrog evolving technology, nws cia siab tias ZTA yuav yog lub hauv paus rau cov tswv yim tshiab ntawm ntau lub hauv ntej tshwj xeeb ntawm biomedicine.