Cobalt chromium alloy cov hniav plooj (porcelain)
Jul 31, 2021
Nws yog cov hniav uas tsis muaj nuj nqis hlau plooj (porcelain) hniav. Cov hniav plooj (porcelain) kho hniav yog cov txheej txheem zoo tshaj plaws rau kev cog hniav. Nws muaj qhov zoo ntawm qhov zoo nkauj, ntuj tsim, ruaj thiab hnav-tiv taus, thiab yog cov khoom nyiam rau ntau tus neeg kho hniav. Yog li dab tsi yog cov khoom siv ntawm cobalt-chromium porcelain hniav? Feem ntau, chromium tsis tsawg dua 25%, molybdenum tsis tsawg dua 4%, thiab tag nrho cobalt, npib tsib xee thiab chromium tsis tsawg dua 85%. Muaj qhov kev xav sib txawv ntawm qhov zoo ntawm cobalt-chromium alloy porcelain hniav. Ib tus neeg ntseeg tias cov npib tsib xee-chromium alloy cov hniav plooj (porcelain hniav) tau siv dav hauv tus nqi qis, thiab ntau dua 50% ntawm cov neeg mob nrog cov hniav plooj (porcelain hniav) xaiv hom hniav hniav no. Cov khoom siv roj ntsha zoo, zoo nkauj, nyiaj txiag, ruaj thiab lwm yam zoo. Txawm li cas los xij, qee tus neeg tau lees paub tias hom hniav plooj (porcelain) no muaj cov plua plav bio-fusion, uas tuaj yeem ua rau ua xua tau yooj yim hauv qee leej neeg thiab ua rau mob ntawm daim tawv nqaij thiab tawv nqaij ua paug. Kev siv cov hniav hniav tshwj xeeb yuav tsum txiav txim siab tom qab sab laj nrog kws kho mob hauv tsev kho mob tas li.
Kev xaiv thiab siv cov khoom siv hlau tsis muaj nqi sib txawv hauv ntiaj teb. Tebchaws Meskas siv cov hlau npib tsib xee-chromium ntau dua; thaum nyob hauv Europe thiab Nyij Pooj, cov hlau cobalt-chromium feem ntau yog siv rau kev kho tas, thiab cov ntsiab lus nickel ntau dua 1% feem ntau tsis siv tau. Piv nrog cobalt-chromium alloy, npib tsib xee-chromium alloy yog yooj yim rau nrum thiab kev lag luam ntau dua, tab sis nws lub cev muaj zog thiab tiv taus xeb tsis zoo li cobalt-chromium alloy. Thaum raug rau thaj chaw ib puag ncig cua sov, xws li hauv plooj (porcelain), lub cev lub cev ntawm cov xim npib tsib xee-chromium tuaj yeem hloov pauv, thiab cov hlau phom tau dhau los ua qhov tsis yooj yim, ua rau lawv tsis haum rau cov choj ntev. Hauv qhov no, cobalt-chromium alloys yog qhov zoo tshaj rau nickel-chromium alloys hauv kev kho cua sov (Morris 1990, Sing li al. 1999).
Cov kws tshaj lij ntseeg tias kev tiv thaiv xeb hauv qhov ncauj kab noj hniav: kev txhim kho xeb ntawm cov hlau tsis muaj cov hlau uas muaj nqi yog qhov sib txawv ntawm cov hlau uas muaj nqi. Vim tias cov khoom siv tseem ceeb ntawm cov hlau sib xyaw muaj txiaj ntsig yog cov hlau muaj txiaj ntsig kub, platinum, palladium thiab/lossis nyiaj, cov hlau muaj txiaj ntsig no muaj cov txheej txheem oxide passive ntawm kev tsim tawm, yog li lawv tuaj yeem tiv thaiv kev xeb rau qhov loj. Qhov no tseem xav txog hauv kev tso tawm cov ions. Hauv cov khoom siv hlau muaj txiaj ntsig, cov khoom tseem ceeb thib ob, tshwj xeeb tshaj yog cov khoom sib txuas oxidant thiab zinc, yuav yaj, thaum qhov xeb ntawm cov hlau tsis muaj hlau uas muaj txiaj ntsig tau txiav txim siab los ntawm nws cov khoom tseem ceeb cobalt. Raws li German tus qauv txheej txheem DIN EN ISO10271 ntawm kev xeb, cov hlau phom kub muaj qis tshaj plaws tso tawm, tom qab ntawd titanium, cobalt-chromium alloys thiab nickel-chromium alloys.
