01
Ntawv Taw Qhia
Yttria-stabilized zirconia (YSZ) ceramics yog dav siv hauv engineering fields-xws li thermal barrier coatings thiab biomedicine-vim lawv cov ntsiab lus melting siab, tshwj xeeb hardness, thiab zoo heev corrosion kuj. Ib txwm siv cov txheej txheem sib xyaw ua ke (piv txwv li, brazing thiab diffusion bonding) feem ntau yuav tsum tau ua kom tag nrho lub rooj sib txoos ua kom ntev thermal kho nyob rau hauv qhov kub siab - qhov cub kub; Cov txheej txheem no tuaj yeem cuam tshuam qhov kev ua haujlwm ntawm cov khoom siv hluav taws xob sab hauv encapsulated, thiab qhov loj ntawm cov qauv ua tiav yog nruj heev los ntawm qhov ntev ntawm lub cub tawg chamber. Yog li ntawd, nws yog ib qho tsim nyog yuav tsum tau ua kom sai, kev sib koom ua ke hauv cheeb tsam uas muaj cov thermal input tsawg. Thaum ultrafast laser welding muaj qhov zoo ntawm qhov tsis tshua muaj thermal input, welding ncaj qha ntawm YSZ ceramics ua rau muaj zog ntau zog deposition uas ua rau cov khoom hnyav ablation. Qhov no ablation manifests li ntse, triangular notches, uas induces tseem ceeb kev nyuaj siab concentrations thiab thaum kawg ua rau ib tug sib koom ua ke muaj zog ntau npaum li cas ntawm cov niam txiv cov ntaub ntawv.
02
**Tsev ntawv tag nrho**
Txhawm rau hais txog cov teeb meem tseem ceeb ntawm kev tshem tawm hnyav thiab kev ntxhov siab, txoj kev tshawb fawb no nthuav tawm ib txoj hauv kev tshiab rau fusion vuam ntawm YSZ ceramics siv lub oscillating ultrafast laser. Los ntawm kev tswj hwm lub laser ultrafast mus oscillate raws ib qho kev qhia tshwj xeeb, cov txheej txheem no nthuav tawm thaj chaw sib cuam tshuam ntawm lub laser thiab cov substrate, yog li dispersing lub laser zog ceev ntawm lub interface. Cov txiaj ntsig tau pom tias, piv rau kev sib txuas ncaj qha, oscillating vuam hloov cov ntse ablation notches rau hauv du, ntiv tes-zoo li qhov tsis zoo thiab ua rau tsim cov qauv nkhaus columnar nplej hauv thaj tsam fusion, yog li txhim kho cov khoom sib koom ua ke. Tsis tas li ntawd, txhawm rau kov yeej qhov teeb meem ntawm qhov tsis txaus nkag mus rau qhov tob uas cuam tshuam nrog ib leeg -sab vuam, qhov kev tshawb fawb no tau ua tiav kev siv ob -sab oscillating welding txheej txheem; txoj hauv kev no tau ua tiav tag nrho - thickness welding tsis muaj kev nkag mus tsis tiav, uas ua rau muaj kev txhim kho ntxiv hauv kev sib koom ua ke plaub - taw tes dabtsi yog khoov lub zog.
03
**Illustrated Analysis**
Daim duab 1 qhia txog cov txheej txheem ntawm oscillating ultrafast laser vuam thiab nws cov txiaj ntsig zoo ntawm macro- thiab micro-morphology ntawm cov pob qij txha tshwm sim. Thaum lub sij hawm vuam txheej txheem, cov qauv yog muab tso rau hauv lub computer-tswj peb-axis (XYZ) motion platform; Thaum lub laser beam traverses linearly raws tus Y-axis, nws ib txhij mus rau ib tug lateral oscillation raws tus X-axis tom qab ib tug triangular waveform (Figs. 1a thiab 1b). Qhov no redistribution ntawm lub zog ntawm oscillation transforms lub ntse, daim duab peb sab ablation notches-feem ntau generated thaum lub sij hawm ncaj qha (tsis yog{12}}oscillating) vuam (Fig. 1-c1)- mus rau smoother, ntiv tes-cov no zoo li notches (Daim duab {{17}) mit concentration. Nyob rau hauv cov nqe lus ntawm microstructure, lub stirring kev txiav txim ntawm lub oscillating laser nyob rau hauv lub molten pas dej ua ke induces lub tsim ntawm curved columnar grain qauv nyob rau hauv lub sib koom tes, oriented parallel mus rau lub laser oscillation trajectory (Fig. 1e). Kev puas tsuaj morphology ntawm thaj tsam fusion (Tebchaws II) (Daim duab. 1d) qhia ntxiv tias, nyob rau hauv kev thauj khoom, cov undulating, elongated columnar nplej zoo li tawg raws lawv cov ciam teb thiab cov dav hlau tawg. Raws li cov kab nrib pleb propagate raws cov kab nkhaus no ciam teb, lawv raug yuam kom hloov lawv cov kev taw qhia tas li; qhov no ua rau muaj kev nce ntxiv ntawm ob qho tib si ntawm thaj chaw ntawm kev tawg tawm thiab lub zog xav tau rau kev puas tsuaj, yog li txhim kho cov khoom siv kho tshuab ntawm kev sib koom ua ke.
Daim duab 2 qhia meej txog qhov sib txawv ntawm microstructural ntawm cov pob qij txha tsim los ntawm ib qho - ib sab thiab ob - sab oscillating ultrafast laser vuam, nrog rau qhov cuam tshuam ntawm qhov sib txawv ntawm plaub - taw tes dabtsi yog khoov lub zog. Daim duab 2a nthuav qhia tus ntoo khaub lig-section thiab tawg morphology ntawm kev sib koom ua ke siv cov txheej txheem ib leeg -ib leeg oscillation ntawm lub zog laser ntawm 900 mW thiab vuam ceev ntawm 0.1 mm / s. Vim tias ib leeg - cov txheej txheem oscillation ib sab disperses lub zog laser, lub yaj qhov tob yog txo qis; yog li ntawd, tag nrho - tuab vuam tsis ua tiav, tawm hauv cov cheeb tsam tsis sib xws hauv qhov sib koom ua ke. Nyob rau hauv daim ntawv thov load, cov cheeb tsam tsis tau nkag mus ua rau muaj kev ntxhov siab loj heev, yog li txwv tsis pub muaj kev txhim kho ntxiv hauv kev sib koom ua ke cov khoom siv kho tshuab. Qhov ob -sab oscillation welding lub tswv yim- tau qhia tshwj xeeb los kov yeej lub fwj no- tau ua pov thawj zoo heev. Raws li pom nyob rau hauv daim duab 2b, nyob rau hauv zoo tib yam kev ua tsis tau, ob -sab vuam txheej txheem ua tiav tiav fusion ntawm kev sib koom tes, zoo tshem tawm cov kev ntxhov siab concentrations tshwm sim los ntawm unbonded cheeb tsam thiab ua kom muaj txiaj ntsim zoo ntawm qhov sib koom ua ke. Kev sib piv cov cuab yeej cuab tam uas tau nthuav tawm hauv daim duab 2c muab kev pom tseeb ntawm qhov kev nce ntxiv hauv lub zog uas tshwm sim los ntawm cov kev txhim kho morphological. Rau ib qho -sab vuam, qhov siab tshaj plaws ntawm 53.9 MPa tau txais ntawm qhov vuam ceev ntawm 0.05 mm / s; conversely, thaum siv ob -sab vuam txheej txheem, lub siab tshaj plaws dabtsi yog khoov zog ntawm 56.2 MPa tau ua tiav ntawm ib tug ceev ntawm 0.10 mm / s - sawv cev rau ib tug 102.2% kev txhim kho piv rau ncaj welding. Qhov no ua kom pom tseeb qhov kev txiav txim siab zoo ntawm ob -sab oscillating welding hauv kev tshem tawm cov teeb meem sab hauv thiab txhim kho tag nrho cov tshuab ua haujlwm ntawm cov pob qij txha ceramic.
