Hauv kev tswj hwm cua sov thiab hluav taws xob conditionals, nws yog qhov tseem ceeb kom muaj lub peev xwm los tsim tooj liab (CU) Additive manufacturing (AM), los yog 3D luam ntawv, muab lub sijhawm uas tsis tau muaj dua los tsim Cu qhov chaw nrog cov geometry nyuaj. Txawm li cas los xij, ntshiab Cu yog qhov muaj kev cuam tshuam zoo ntawm infrared lasers, yog li cov ntshiab Cu qhov chaw luam tawm nrog cov khoom siv laser additive raug siv feem ntau yuav muaj porosity siab, uas txo lawv cov tshuab thiab thermal / hluav taws xob conductivity. Txawm hais tias qhov siab tseem ceeb ntawm cov khoom siv tooj liab zoo nkauj los ntawm cov nqaj ntsuab tau muaj kev tiv thaiv kom tsis txhob muaj laser additively tooj liab qhov chaw ntawm high mechanical loads thiab kub kub.
Txhawm rau daws cov teeb meem saum toj no, pab pawg ntawm Prof. Xingxing Zhang los ntawm University of Queensland, Australia, koom tes nrog Prof. Christopher Hutchinson los ntawm Monash University, Prof. Julie Cairney los ntawm University of Sydney, Prof. Miao-Quan Li los ntawm Northwestern Polytechnical University, Prof. Xiaoxu Huang los ntawm Chongqing University, Prof. Jesper Henri Hattel los ntawm University of Science thiab Technology ntawm Denmark, thiab Prof. Mark Easton los ntawm RMIT University, tau koom tes ua ke los tsim cov khoom tooj liab nrog cov khoom siv siab. Prof. Mark Easton, RMIT University, thiab lwm pab pawg tau sib koom tes los tawm tswv yim tsim qauv rau 3D luam ntawv ntawm cov khoom siv hluav taws xob thiab cov khoom siv hluav taws xob siab. Tus yuam sij rau kev tsim lub tswv yim yog xaiv cov khoom siv ntxiv uas yog homogeneously tov nrog cov hmoov tooj liab ntshiab kom ntseeg tau tias nws txhim kho lub laser nqus ntawm cov ntshiab tooj liab thaum lub laser cuam tshuam nrog cov hmoov. Tsis tas li ntawd, cov additives yog dispersed nyob rau hauv tooj liab matrix los ntawm dissolving mus rau hauv lub yaj pas dej ua ke thaum cov hmoov yog melted thiab re-precipitating thaum lub sij hawm solidification, yog li ntxiv dag zog rau cov tooj liab tsis txo nws cov thermal / hluav taws xob conductivity. Cov txheej txheem tshuaj xyuas rau cov khoom siv ntxiv yog raws li hauv qab no: (1) cov khoom solubility ntawm cov ntsiab lus ntawm cov khoom hauv tooj liab yuav tsum tsawg heev kom txo tau lawv cov kev tsis zoo ntawm thermal / hluav taws xob conductivity thiab ua kom muaj peev xwm ua kom rov zoo dua ntawm nanoparticles thaum solidification; (2) cov khoom yuav tsum muaj cov ntsiab lus melting tsawg los pab txhawb lawv cov yaj mus rau hauv lub pas dej molten thiab ua kom tsis muaj zog rau coarsening ntawm reprecipitated nanoparticles thaum lub sij hawm solidification; (3) cov khoom yuav tsum muaj qhov qis qis hauv cov kua tooj liab yuav tsum muaj lub kaum sab xis qis kom tiv thaiv agglomeration ntawm reprecipitated nanoparticles hauv cov kua tooj liab. Raws li lub tswv yim tsim, peb pom tias lanthanum hexaboride (LaB6) ua tau raws li cov qauv saum toj no. Los ntawm kev ntxiv cov lej ntawm LaB6 nanoparticles, siab ceev thiab kev ua haujlwm siab tooj liab thiab nws cov geometrically complex qhov chaw tau pom los ntawm laser additive manufacturing.
Cov hauj lwm cuam tshuam tau luam tawm nyob rau hauv lub ntiaj teb sab saum toj phau ntawv journal Nature Communications nyob rau hauv lub npe ntawm "Kev tsim cov siab zog thiab siab conductivity tooj liab nrog laser hmoov txaj fusion". Kev sib txuas lus. Dr. Yinggang Liu (tam sim no yog tus xibfwb ntawm Tsev Kawm Ntawv ntawm Aeronautics, Northwestern Polytechnical University) thiab Dr. Jingqi Zhang ntawm University of Queensland yog thawj tus kws sau ntawv, thaum Prof. Mingxing Zhang ntawm University of Queensland, Dr. Ranming Niu ntawm University of Sydney, thiab Prof. Christopher Hutchinson ntawm Monash University yog cov kws sau ntawv sib tham.
Duab.
Additive manufacturing (AM), los yog 3D luam ntawv, ua kom cov ntaub ntawv ceev ceev ntawm cov khoom siv tooj liab geometrically thiab muaj ntau yam kev siv hauv thermal tswj thiab hluav taws xob conductivity. Txawm li cas los xij, cov tooj liab ntshiab yog mos, thaum nws muaj kev cuam tshuam siab rau infrared lasers feem ntau ua rau 3D luam tawm qhov chaw nrog porosity siab, uas txo lawv cov kev ua tau zoo. Txawm hais tias kev tsim khoom ntsuab siv cov kab teeb ntsuab lossis hluav taws xob muab cov tawv nqaij ntshiab thiab nws muaj peev xwm tiv thaiv tus tooj liab kub. Ntxiv cov ntsiab lus xws li Cr, Co, Fe, thiab Zr rau cov tooj liab ntshiab los ntawm alloying nws tuaj yeem ua rau laser nqus thiab ntxiv dag zog rau cov substrate, tab sis txoj kev no txo cov thermal / hluav taws xob conductivity ntawm tooj liab vim lawv cov khoom solubility hauv tooj liab. Lwm txoj hauv kev yog ntxiv cov khoom sab nraud (Al2O3, TiB2, thiab lwm yam) uas tsis tuaj yeem nrog cov tooj liab ntshiab kom ntxiv dag zog rau cov tooj liab thaum tswj cov thermal / hluav taws xob conductivity. Txawm li cas los xij, hauv kev xyaum, vim yog nanoparticle agglomeration, nws ua pov thawj nyuaj heev kom tau txais kev txhawb nqa tseem ceeb yam tsis muaj kev cuam tshuam cov ductility thiab kev puas tsuaj. Raws li qhov tshwm sim, alloying lossis ntxiv cov khoom tsis sib xws tuaj yeem ua rau muaj zog thiab txhim kho laser nqus cov khoom, tab sis feem ntau ua rau txo qis hauv thermal / hluav taws xob conductivity thiab ductility.3D luam ntawv ntawm high-strength, high-conductivity tooj liab seem tseem yog ib qho kev sib tw nias. .
Ntawm no, peb ua qauv qhia txog kev tsim cov khoom siv laser ntxiv rau kev npaj cov khoom siv high-density, kev ua haujlwm siab ntawm tooj liab los ntawm kev ntxiv me me ntawm lanthanum hexaboride (LaB6) nanoparticles rau cov hmoov tooj liab ntshiab los ntawm laser hmoov txaj fusion (L-PBF). Tus yuam sij rau txoj kev no yog kev taw qhia txog cov khoom tsim nyog rau hauv cov tooj liab ntshiab uas txhim khu lub laser nqus ntawm cov ntshiab tooj liab, ua raws li kev sib cais hauv lub pas dej ua ke thiab rov ua dua thaum lub sij hawm solidification. LaB6 raug xaiv raws li nws qhov siab laser nqus, zoo hluav taws xob conductivity, tsis tshua muaj melting point, thiab qis wetting lub kaum sab xis nrog cov kua tooj liab.LaB6 muaj ob lub luag haujlwm. Ua ntej, nws txhim kho lub laser nqus ntawm cov ntshiab tooj liab, yog li nyiam fusion zoo dua ntawm cov hmoov. Thib ob, nws muaj peev xwm yaj thaum lub sij hawm hmoov fusion thiab tom qab reprecipitate raws li diffusely nanoparticles thaum lub sij hawm solidification tsis tsuas yog txhim khu lub zog ntawm cov khoom, tab sis kuj tuav ntau dua ductility thiab siab thermal / hluav taws xob conductivity.1wt% LaB6-doped tooj liab pov thawj lub zog tawm los ntawm 346.8 MPa, 3.7 npaug ntau dua li cov tooj liab ntshiab, nrog rau cov pob txha tawg ntawm 22.8%, 98.4%, thiab cov thermal / hluav taws xob siab ntawm 1.4%.1wt% LaB6-doped tooj liab kuj yog tus neeg sib tw zoo rau IACS (International Annealed Pure Copper Scheme). IACS (International Annealed Copper Standard) hluav taws xob conductivity, thermal conductivity ntawm 387 W / mK, thiab zoo heev tsis kam mus softening ntawm 1050 degree, uas yog ze rau lub melting point ntawm ntshiab tooj liab. Tsis tas li ntawd, kev siv ntawm txoj kev rau geometrically complex qhov chaw kuj pom nyob rau hauv txoj kev tshawb no. Qhov tsim tshiab LaB6-doped tooj liab ua rau qhov sib txawv tseem ceeb hauv 3D luam ntawv ntawm cov hlau thiab tsim nyog rau cov khoom siv siab thiab qhov kub thiab txias. Txij li thaum tsis sib xws nanoparticles feem ntau yog siv los ntxiv dag zog rau cov khoom siv hlau, qhov tsim cov tswv yim ntawm reprecipitation thaum melting thiab solidification tuaj yeem txuas mus rau lwm lub tshuab alloy rau kev tsim cov ntaub ntawv-npaj, ua haujlwm siab.
Daim duab 1 Microstructure thiab laser reflectivity kuaj tau ntawm ntshiab thiab LaB6-doped tooj liab npaj los ntawm laser hmoov txaj melting
Daim duab 2 Nanoparticle tsom xam ntawm LaB6-doped tooj liab npaj los ntawm laser hmoov txaj melting
Daim duab 3 APT elemental characterization ntawm LaB6 doped tooj liab npaj los ntawm laser hmoov txaj melting
Daim duab 4 Mechanical zog thiab hluav taws xob conductivity kuaj tau ntawm LaB6-doped tooj liab npaj los ntawm laser hmoov txaj melting.
Daim duab 5 Compression xeem tau ntawm LaB6 doped tooj liab dots npaj los ntawm laser hmoov txaj melting
