Raws li ib feem tseem ceeb ntawm engineering cov ntaub ntawv thiab cov khoom siv ua haujlwm, cov khoom siv ceramic siab heev muaj cov ntawv thov dav dav hauv lub zog tshiab, kev sib txuas lus electronics, semiconductor, aerospace thiab lwm yam kev lag luam. Txawm li cas los xij, vim tias cov hmoov ceramic feem ntau yog ionic daim ntawv cog lus lossis covalent daim ntawv cog lus, cov txheej txheem sintering ib txwm ua los npaj ntom.cov ntaub ntawv ceramicyuav tsum tau siab dua sintering kub thiab ntev tuav lub sij hawm, uas inevitably ua rau grain coarsening thiab porosity residue, thiab ces cuam tshuam cov khoom ntawmceramic txhaj molding. Yuav kom txo tauhlau sinteringQhov kub thiab txias, txo lub sijhawm sintering, txhim kho sintering ceev thiab cov khoom siv, cov kws tshawb fawb tau tsim ntau yam tshiab sintering technologies.
Spark plasma sintering (SPS)
SPS thev naus laus zis yog hom tshiab ntawm kev siv tshuab sintering ceev uas tau muaj kev txhawj xeeb thiab kawm hauv ntiaj teb kev kawm. FIG. 1 qhia nws txoj hauv kev ua haujlwm.
SPS technology pioneered qhov kev taw qhia ntawm dc mem tes tam sim no rau hauvtxheej txheem sintering. Lub indenter ua raws li tus neeg nqa khoom rau qhov tam sim no dhau mus thaum siv lub zog rau cov khoom. Tsis zoo li cov txheej txheem sintering ib txwm siv, uas feem ntau siv cov cua sov ntawm lub cev cua sov, SPS siv cov nyhuv thermal ntawm cov hluav taws xob loj dhau los ntawm cov pwm los yog cov qauv ua kom sov cov khoom. Rau cov qauv insulating, graphite nrog cov khoom siv hluav taws xob zoo feem ntau yog siv los ua cov khoom siv pwm, thiab cov pwm ua hauj lwm kub yog siv los ua kom cov qauv nce sai. Rau cov qauv coj mus kuaj, cov pwm insulating tuaj yeem siv los ua kom sov ib qho tam sim no ncaj qha los ntawm cov qauv. Cov cua sov tuaj yeem ncav cuag 1000 ℃ / min. Thaum cov qauv ntsuas kub nce mus txog tus nqi teev, sintering tuaj yeem ua tiav tom qab lub sijhawm luv luv ntawm kev txuag hluav taws xob.
SPS thev naus laus zis muaj qhov zoo ntawm qhov ntsuas kub qis, lub sijhawm tuav lub sijhawm luv, cua sov ceev, hloov tau sintering siab, thiab ntau qhov sib txuas (hluav taws xob-mechanical-thermal).
Flash sintering (FS)
FS thev naus laus zis tau tshaj tawm thawj zaug hauv xyoo 2010 los ntawm Cologna thiab al los ntawm University of Colorado, raws li kev tshawb fawb ntawm kev pabcuam hlau hmoov sintering technology (FAST)
FS thev naus laus zis feem ntau suav nrog peb cov txheej txheem tsis ua haujlwm, uas yog lub tshuab hluav taws xob kub (Tf), thaj chaw siv (E) thiab tam sim no (J). Daim duab 3C qhia txog qhov sib txawv ntawm txhua qhov ntsuas hauv cov txheej txheem FS ib txwm muaj. Nyob rau hauv hom no, ib tug khov kho hluav taws xob teb yog siv rau cov khoom thiab lub cub tawg kub ntawm tus nqi tas mus li. Thaum lub cub tawg kub yog qhov tsawg, cov khoom siv tiv taus yog siab thiab qhov tam sim no ntws los ntawm cov khoom me me. Nrog rau qhov kub ntawm lub cub tawg, cov qauv resistivity txo thiab tam sim no maj mam nce. Cov theem no yog hu ua theem incubation thiab lub kaw lus yog tswj voltage. Thaum lub qhov cub kub kub nce mus rau qhov ntsuas kub tseem ceeb, cov khoom siv hluav taws xob poob qis tam sim ntawd, tam sim no nce siab, thiab FS tshwm sim. Txij li thaum lub zog hluav taws xob tseem nyob ruaj khov nyob rau lub sijhawm no, lub zog hluav taws xob (W = EJ) yuav ncav cuag lub zog txwv ntawm lub zog hluav taws xob, thiab lub kaw lus yuav hloov los ntawm kev tswj hluav taws xob mus rau kev tswj tam sim no, uas yog hu ua FS theem. Thaum lub resistivity ntawm cov khoom tsis sawv, lub teb lub zog stabilizes dua, thiab sintering nkag mus rau lub ruaj khov theem, uas yog, lub rwb thaiv tsev theem ntawm FS. Tom qab lub rwb thaiv tsev theem, ua tiav FS txheej txheem xaus.
Piv nrog rau cov tsoos sintering, FS muaj qhov zoo hauv qab no: txo lub sijhawm sintering thiab txo qhov kub ntawm lub cub tawg uas yuav tsum tau ua rau sintering, inhibit grain loj hlob, tuaj yeem ua tiav tsis sib npaug sintering, khoom siv yooj yim, tus nqi qis.
Post lub sij hawm: Jun-07-2022