Cov yam ntxwv cuam tshuam rau laser absorbance ntawm tooj liab hmoov.
1.Ib feem ntawm particle loj
Qhov kev xav ntawm peb qhov sib txawv ntawm qhov sib txawv ntawm cov hmoov tooj liab ntshiab rau cov lasers sib txawv yog qhia hauv daim duab hauv qab no, uas qhia tau hais tias qhov kev xav ntawm cov hmoov tooj liab rau laser nce nrog lub wavelength, tshwj xeeb tshaj yog nyob rau hauv lub wavelength band saum 550nm, lub reflectance ntawm tooj liab hmoov. rau laser nce sai, uas yog lub ntsiab yog vim li cas nws yog ib qho nyuaj rau tsim tooj liab qhov chaw los ntawm SLM txawm lub zoo thermogenicity ntawm 1046nm IR laser.Qhov nqus ntawm 1064nm wavelength laser yog 21.8 feem pua rau cov hmoov tooj liab ntshiab nyob rau hauv qhov ntau ntawm {{5 }} µm, 22 feem pua hauv thaj tsam ntawm 15-53 µm, thiab 39.4 feem pua hauv thaj tsam ntawm 5-35 µm.
Fig. Reflectance ntawm ntshiab tooj liab hmoov nrog peb particle loj distributions rau txawv wavelengths ntawm laser thiab laser reflectance ntawm 1064nm
Laser nqus tus nqi ntawm cov hmoov hlau yog cuam tshuam los ntawm ntau yam, ntxiv rau qhov xwm ntawm cov hmoov khoom nws tus kheej, tab sis kuj los ntawm cov xim ntawm cov hmoov, kub, particle deg zoo, laser tshwm sim lub kaum ntse ntse thiab lwm yam. Cov kev hloov pauv hauv qhov loj me tshwm sim los ntawm tooj liab hmoov xim thiab laser reflection ntawm cov hmoov hmoov hloov, cov hmoov me me, cov hmoov xim tsaus dua, qhov me dua cov hmoov particle loj nyob rau hauv ib co ntau dua qhov nqus ntawm 1064nm wavelength. laser. Qhov me me me me ntawm cov hmoov hlau, ntau lub sij hawm lub laser yuav tshwm sim ntawm cov hmoov, indirectly nce tus nqi nqus ntawm cov hmoov rau lub laser.
2. Cov nyhuv ntawm alloying
Lub laser reflectance ntawm Cu{{0}}.8 wt feem pua Cr hmoov tau sim thiab muab piv nrog cov laser nqus ntawm cov hmoov ntshiab tooj liab. Lub laser reflectance ntawm Cu-0.8 wt feem pua Cr hmoov ntawm 1064 nm yog 69.5 feem pua, uas yog qis dua lub laser reflectance ntawm ntshiab tooj liab hmoov nrog tib particle loj tis, tab sis tseem siab dua lub laser reflectance ntawm { {7}}um ntshiab tooj liab hmoov, raws li qhia hauv daim duab hauv qab no. Nws tau raug sim ua pov thawj tias Cr muaj ntau dua lub teeb nqus tus nqi piv nrog Cu, thiab cov khoom siv ntawm Cr hauv Cu lattice distortion kuj cuam tshuam rau laser nqus tus nqi, yog li nyob rau tib qhov loj me ntawm 15-53um, vim rau qhov sib ntxiv ntawm 0.8wt feem pua Cr keeb, lub laser nqus tus nqi ntawm Cu-0.8wt feem pua Cr hmoov ntau dua li cov ntshiab Cu hmoov ntawm 1064nm, Cu -0.8wt feem pua Cr hmoov muaj ib laser nqus tus nqi ntawm 30.5 feem pua ntawm 1064 nm, thaum tus nqi yog 22 feem pua rau 15-53um ntshiab tooj liab hmoov.
Laser reflectance ntawm Cu-0.8wt feem pua Cr ntawm txawv wavelengths thiab laser nqus ntawm 1064nm
3. Cov nyhuv ntawm qhov chaw hloov kho
Nano TiC yog cov hmoov av dub nrog cov khoom me me, thaj chaw loj tshwj xeeb thiab kev ua haujlwm siab, uas feem ntau yog ntxiv rau cov hlau matrix raws li theem kev txhim kho cov khoom siv. Lub laser nqus tus nqi ntawm 1064 nm tseem yog siab li 96.7 feem pua. Lub laser nqus tus nqi ntawm tooj liab thiab tooj liab alloy hmoov yuav raug txhim kho los ntawm kev hloov kho deg ntawm nano-TiC.
Reflectance ntawm nano-TiC rau txawv wavelengths ntawm laser thiab ntawm 1064 nm
Cov nano-TiC tau coated rau saum npoo ntawm cov hmoov tooj liab los ntawm pob milling, thiab 0 05 feem pua , 0.1 feem pua , 0.2 feem pua , { {9}}.3%. Los ntawm daim duab hauv qab no, nws tuaj yeem pom tias qhov sib ntxiv ntawm nano-TiC txo qis laser reflectivity ntawm ntshiab tooj liab hmoov, thiab laser reflectivity ua me thiab me me nrog nce nano-TiC cov ntsiab lus nyob rau hauv ib tug tsis tu ncua gradient txo. Lub nano-loj TiC yog uniformly coated rau saum npoo ntawm tooj liab hmoov los ntawm pob milling, uas npog cov thawj metallic luster ntawm tooj liab hmoov, thiab ua ke nrog lub siab nqus tus nqi ntawm laser los ntawm nano-TiC nws tus kheej, nws ho txo lub laser reflectivity ntawm tooj liab hmoov.
Reflectance ntawm peb cov ntshiab tooj liab hmoov nrog ntau pawg ntawm nano-TiC ntxiv rau qhov sib txawv wavelengths ntawm lub teeb laser. (a:5-35um, b:15-53um, c:40-160um)
4. Cov nyhuv ntawm alloying thiab deg hloov kho
Lub laser reflectance ntawm Cu{{0}}.8wt feem pua Cr hmoov nrog ntau pawg ntawm nano-TiC ntxiv ntawm qhov sib txawv wavelength yog qhia hauv qab no. Thaum lub wavelengths zoo ib yam, lub laser reflectance ntawm tooj liab hmoov txo qis raws li qhov loj ntawm nano-TiC ntxiv nce, thiab lub laser nqus ntawm cov hmoov yog 67.3 feem pua, thaum lub loj feem ntawm nano-TiC ntxiv yog 0.4wt feem pua. Qhov kev ntsuam xyuas tau hais tias nto alloying ntxiv rau qhov kev hloov kho saum npoo tseem tuaj yeem txo qhov kev nqus ntawm laser ntawm cov hmoov, uas tseem muab lub tswv yim los txhim kho lub laser nqus ntawm cov hmoov txhuas.
Reflectance ntawm Cu-0.8wt feem pua Cr hmoov nrog ntau pawg ntawm TiC ntxiv rau qhov sib txawv wavelengths ntawm lub teeb laser
5. Kev kho oxidation
Lub laser reflectance ntawm peb ntshiab tooj liab hmoov thiab Cu-0.8wt feem pua Cr alloy hmoov tau rhuab mus rau 50 degree, 150 degree, 250 degree, 350 degree thiab tuav rau 5min nyob rau hauv corundum crucible, thiab kuaj nyob rau hauv chav tsev kub (RT ) thiab tom qab oxidation kev kho mob, thiab lwm yam. Lub laser reflectance yog qhia hauv qab no. Lub laser absorbance ntawm peb cov ntshiab tooj liab hmoov nyob rau hauv cov kev mob ntawm 50 degree thiab 150 degree thiab tuav rau 5min muaj ib tug me me hloov piv nrog rau lub laser absorbance ntawm unoxidized hmoov. Thaum qhov kub thiab txias tau nce mus rau 250 degree thiab tuav rau 5 min, lub laser reflectivity ntawm cov hmoov txo qis thiab mus txog qhov siab tshaj plaws ntawm 350 degree thiab tuav rau 5 min. Lub laser nqus cov nqi ntawm peb cov hmoov tooj liab ntshiab yog 61.7 feem pua, 68.3 feem pua thiab 64.8 feem pua rau 5-35}um, 15-53um thiab 40-160um ntawm 350 degree thiab tuav rau 5 min, raws li . Lub laser nqus cov nqi ntawm Cu-0.8wt feem pua Cr hmoov nce los ntawm 30.5 feem pua rau 41.2 feem pua thiab 42.3 feem pua tom qab oxidation ntawm 50 degree thiab 150 degree, feem, thiab nce mus rau 76.9 feem pua thiab 77.4 feem pua tom qab oxidation ntawm 250 degree thiab 350 degree, feem, piv nrog cov ntshiab tooj liab hmoov nrog tib particle loj tis.
Laser reflectance ntawm txawv wavelengths rau cov hmoov sib txawv tuav ntawm 50 degree, 150 degree, 250 degree, 350 degree rau 5min raws li (a:5-35um, b:15-53um, c:40-160} um, d: Cu-0.8wt feem pua Cr)
Xaus
Muaj ntau txoj hauv kev los txhim kho lub laser nqus tus nqi ntawm cov hmoov hlau, tab sis nyob rau hauv lub hauv paus ntawm kev txhim kho lub laser nqus tus nqi ntawm cov hmoov, seb nws puas tuaj yeem ua kom qhov zoo ntawm cov khoom tsim yuav tsum tau sim los xyuas kom meej. Piv txwv li, qhov me me ntawm cov hmoov particle loj, qhov siab dua qhov kev nqus ntawm lub laser, tab sis nws tsis txhais tau hais tias qhov me me ntawm cov hmoov hlau hmoov loj dua qhov zoo dua, vim tias cov khoom siv laser melting tau xaiv yog ib qho tuab ntawm cov hmoov txheej, hmoov particle loj. tsawg dua qhov tsawg kawg nkaus thickness ntawm cov cuab yeej yuav tsis muaj peev xwm nteg cov hmoov zoo, yog li qhov tsim nyog particle loj tsis tuaj yeem tsuas saib ntawm tus nqi laser nqus; Rau alloying thiab kev hloov kho saum npoo av, tooj liab alloys uas twb muaj lawm muaj cov txheej txheem paub tab, thiab cov txiaj ntsig ntawm qhov sib ntxiv ntawm cov kab hauv qab ntawm qhov zoo ntawm cov khoom tsim yuav tsum tau kuaj xyuas. Txoj kev oxidation saum npoo zoo txo qhov kev cuam tshuam ntawm tooj liab hmoov rau laser, tab sis rau hlau additive manufacturing hmoov, qhov qis dua cov pa oxygen ntawm cov hmoov, qhov me me ntawm cov dej ua haujlwm, qhov zoo dua cov nyhuv melting thiab ntau dua qhov sib sau ntom ntom, txawm hais tias lub nce nyob rau hauv cov ntsiab lus oxygen ua rau cov hmoov lub laser reflectivity txo, tab sis cov hmoov oxygen cov ntsiab lus yuav tsum tau tswj nyob rau hauv ib tug tsim nyog ntau yam.
Bibliography: "A Study on the Laser Absorption Rate of Copper and Copper Alloy Powder and its Selected Area Laser Melting and Forming", Shen Jibiao, Kunming University of Science thiab Technology
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