Cobalt-raws li alloy yog ib qho nyuaj alloy uas tiv taus ntau hom hnav thiab corrosion zoo li kub-kub oxidation. Nws siv cobalt raws li nws cov ntsiab lus tseem ceeb thiab tseem muaj ntau npaum li cas ntawm nickel, chromium, tungsten thiab ib qho me me ntawm cov hlau alloying xws li molybdenum, niobium, tantalum, titanium, lanthanum, thiab qee zaus hlau. Cobalt-raws li alloys yuav siv tau los ua welding hlau, castings thiab forgings, thiab lwm yam nyob ntawm seb muaj pes tsawg leeg ntawm cov alloy. Qhov peb tab tom tham txog niaj hnub no feem ntau yog lub luag haujlwm ntawm cobalt-based alloys hauv tshuaj.
Cov khoom siv hlau kho mob uas muaj ntau dua hauv lub neej feem ntau yog siv ntau yam xws li cov khoom siv phais mob, cov khoom siv dag zog, cov ntaub so ntswg tawv, cov ntaub so ntswg, thiab lwm yam, thiab tau siv dav. Txawm li cas los xij, qhov teeb meem tseem ceeb hauv kev siv cov khoom siv biomedical hlau yog qhov sib txawv ntawm cov hlau ions mus rau hauv cov ntaub so ntswg ib puag ncig vim yog corrosion nyob rau hauv lub cev ib puag ncig thiab degradation ntawm cov khoom ntawm cov khoom cog nws tus kheej. Qhov qub yuav ua rau muaj kev phiv tshuaj lom, thiab tom kawg feem ntau ua rau kev cog qoob loo tsis ua haujlwm. Kev kho mob cobalt-raws li alloys yog dav siv nyob rau hauv kev tsim cov orthopedic implants vim lawv ob tug yam ntxwv tseem ceeb ntawm hnav tsis kam thiab corrosion kuj. Muaj ob hom kev kho mob cobalt-based alloys: cobalt-chromium-molybdenum alloys thiab cobalt-nickel-chromium-molybdenum alloys.
Cobalt-chromium alloy yog thawj zaug siv los ua cov khoom siv dav hlau. Tom qab ntawd, vim nws zoo hnav tsis kam, corrosion kuj thiab siab zog, nws tau dav siv nyob rau hauv articular nto Cheebtsam thiab load-bearing Cheebtsam ntawm cov pob qij txha. Nyob rau tib lub sijhawm, vim nws cov biocompatibility zoo, nws kuj yog ib qho khoom siv feem ntau rau kev cog hniav.
Cobalt-chromium-molybdenum alloy thiab nickel-chromium-molybdenum alloy yog variants ntawm cobalt-chromium alloy. Lub qub yog feem ntau siv rau castings thiab yog yooj yim rau cov duab, thaum lub tom kawg yog feem ntau yog kub forged thiab feem ntau muaj zoo corrosion kuj. Ob lub alloys no muaj kev siv tshuaj kho mob ntxiv dua li qhov dav cobalt-chromium alloy thiab muaj biocompatibility zoo heev. Lawv muaj lub zog tensile siab thiab zoo rigidity, thiab tuaj yeem muab kev txhawb nqa txhua yam ruaj khov. Ntawm qhov tod tes, ob lub alloys muaj siab toughness, tsis tshua muaj siab rhiab heev, thiab zoo heev qaug zog kuj.
Lub chromium hauv lub alloy tuaj yeem tsim cov txheej xim oxide ntawm cov npoo av, uas tuaj yeem txhim kho lub corrosion tsis kam ntawm cov alloy. Cov ntsiab lus chromium kuj tuaj yeem tsim cov carbides, uas muaj hardness siab thiab tuaj yeem txhim kho lub zog ntawm matrix thiab hnav tsis kam ntawm alloy. Lub molybdenum keeb nyob rau hauv cov hlau yog yaj nyob rau hauv lub matrix thiab yuav ua tau ib tug barrier rau dislocation txaus, yog li txhim kho lub zog ntawm lub matrix.
