Tantalum hmoov tuaj yeem rov siv dua lossis rov ua dua tshiab, uas tuaj yeem txo tus nqi ntawm cov khoom tsim nrog tantalum siv cov khoom siv ntxiv. Txoj kev kawm no saib cov ntsiab lus oxygen, particle zoo, coj mus siv tantalum ib ce ntawm cov yam ntxwv ntawm tantalum cov khoom thiab scaffolds. Tsis tas li ntawd, nrog tantalum hmoov rov siv ntau dua 30 lub voj voog, cov nyhuv ntawm lub sijhawm rov siv dua ntawm cov yam ntxwv ntawm tantalum Cheebtsam thiab scaffolds tsim los ntawm electron beam hmoov txaj fusion (EB-PBF) tau kuaj xyuas. Cov kev tshawb pom pom tias qhov pom tseeb meej, coj mus sib txawv, thiab tom qab 25 yuav muaj ntau yam kev tawm tsam thiab ib qho ntxhib nto. Txawm li cas los xij, tom qab 15 lub voj voog rov qab siv dua, cov yas ntawm cov tantalum ntom ntom tau txo qis vim qhov nce ntawm cov pa oxygen ntawm tantalum hmoov, thiab qee qhov ua tau microdefects pib tshwm sim hauv cov qauv tantalum uas siv cov txheej txheem EB-PBF. Txawm li cas los xij, tus naj npawb ntawm kev siv nyob rau hauv qhov kev tshawb fawb ntau yam tsis cuam tshuam rau lub zog tensile ntawm ntom tantalum Cheebtsam.
Reuse qhov cuam tshuam rau cov hmoov cov khoom
Nrog rau qhov nce ntawm qhov ntau ntawm cov voj voog rov siv dua, tantalum hmoov cov ntsiab lus oxygen tau nce. Cov theem ntawm cov substrate ua ntej mus rau cov txheej txheem EB-PBF, nrog rau cov txheej txheem rov ua dua cov hmoov tom ntej, yog lub sijhawm tseem ceeb thaum cov hmoov raug rau huab cua thiab cov ntsiab lus oxygen tau nce. Cov kev tshawb pom nyob rau hauv daim duab 4 qhia tau hais tias thaum lub sij hawm ntawm 30 reuse cycles, cov pa oxygen concentration ntawm tantalum hmoov tau nce 4.7 ppm ib EB-PBF ua hauj lwm. Vim yog cov tantalum hais tau rhuab thiab melted nrog ib tug electron beam nyob rau hauv ib tug siab lub nqus tsev vacuum thaum lub sij hawm tus txheej txheem EB-PBF, cov pa cov ntsiab lus tau maj mam.
tsis muaj kev hloov pauv hauv qhov nruab nrab qhov loj me tom qab 30 rov siv dua. Muaj ntau yam ua rau muaj qhov hloov me me ntawm qhov loj me nrog kev siv rov ua dua tshiab, suav nrog: Tus naj npawb ntawm cov khoom me me raug txo vim yog cov txheej nyias nyias (50 m) thiab khawb ntawm cov hmoov coarse; tus naj npawb ntawm cov khoom loj tau nce vim yog txaws, adhesion, thiab remelting; thiab tus naj npawb ntawm cov khoom me me tau txo qis vim qhov nyiam melting ntawm cov hmoov nplua-grained hmoov. Yog li ntawd, particle loj tsuas yog marginally nce. Qhov nruab nrab particle loj yog tsawg dua tom qab rov siv dua vim hais tias cov khoom loj tau raug tshuaj xyuas thiab cov khoom siv hmoov sib cais tau sib cais.Cov tantalum hmoov's D10, D50, thiab D90 kev hloov pauv txhua yam ua raws li tus qauv tib lub sijhawm tag nrho cov txheej txheem EB-PBF, yog li cov particle loj. Kev faib tawm NW nyuam qhuav hloov pauv thiab qhov qub particle faib tau khaws cia.
Lub substrate tau rhuab nrog lub teeb hluav taws xob rau 700 degree ua ntej mus rau EB-PBF txheej txheem. Lub txaj hmoov tau muab khaws cia ntawm qhov kub tshaj 660 degree rau lub sijhawm ntawm EB-PBF txheej txheem. Cov tantalum particles 'mom nto roughening thiab deformation yog li cia siab tias, tshwj xeeb tshaj yog thaum lub sij hawm kos-tawm EB-PBF txheej txheem. Tsis tas li ntawd, thaum lub sij hawm EB-PBF txheej txheem, qee cov khoom nyob ze ntawm cov khoom siv tau muab tso rau hauv qhov kub thiab txias, uas tuaj yeem ua rau cov khoom ua kom pom kev deformation thiab qhov roughness. Thaum lub sij hawm rov qab txheej txheem, lub siab-siab cua dav hlau tsim concave cheeb tsam ntawm cov hmoov particle nto.some ntawm cov yam ntxwv. Tshwj xeeb, kev ua txhaum tau siv sijhawm ntev dua los tshwm sim dua li Ti-6Al-4V hmoov tom qab 25 rov siv dua [15, 19]. Nrog ntau cov hmoov rov siv dua, nws tau cia siab tias yuav muaj qhov tsis zoo ntawm qhov chaw ntau dua, uas yuav ua rau kom qhov roughness thiab particle distortion.
Xaus 1. Tom qab 30 rov ua dua ntawm cov txheej txheem EB-PBF, tantalum hmoov cov pa oxygen tau nce los ntawm 0.004 mus rau 0.018 qhov hnyav feem pua. Tom qab ob peb lub voj voog rov qab siv dua, tantalum hmoov lub fluidity, particle loj, pom meej ceev, thiab kais ceev tsis hloov pauv.
2. Tom qab 20 rounds ntawm reuse, tantalum hmoov hais yog kheej kheej thiab muaj ib tug du nto. Tom qab ntau dua 25 rov siv dua, me ntsis deformation hauv cov duab me me tau pom, thiab thaum lub sij hawm EB-PBF txheej txheem, cov khoom loj thiab me me fused.
