Njengengxenye ebalulekile yezinto zokwakha zobunjiniyela kanye nezinto ezisebenzayo, izinto ezithuthukisiwe ze-ceramic zinamathemba abanzi wokusebenzisa amandla amasha, i-electronics yezokuxhumana, i-semiconductor, i-aerospace kanye neminye imikhakha yezimboni. Kodwa-ke, ngenxa yokuthi impushana ye-ceramic ngokuvamile iyisibopho se-ionic noma i-covalent bond compound, inqubo ye-sintering yendabuko yokulungisa okuminyene.izinto ze-ceramickudinga izinga lokushisa eliphezulu le-sintering kanye nesikhathi eside sokubamba, okuholela ngokungagwemeki ekukhuleni kokusanhlamvu kanye nezinsalela ze-porosity, bese kuthinta izakhiwo zeukubumba umjovo we-ceramic. Ukuze unciphiseinsimbi sinteringizinga lokushisa, nciphisa isikhathi se-sintering, ukuthuthukisa ukuminyana kwe-sintering kanye nezakhiwo ezibonakalayo, abacwaningi baye bahlakulela ubuchwepheshe obusha be-sintering.
I-Spark plasma sintering(SPS)
Ubuchwepheshe be-SPS wuhlobo olusha lobuchwepheshe be-sintering obukhathazeke kakhulu futhi bufundwe emhlabeni wezemfundo. I-FIG. 1 ikhombisa umgomo wayo wokusebenza.
Ubuchwepheshe be-SPS buqale ukwethulwa kwe-dc pulse current ku-inqubo sintering. I-indenter isebenza njengenkampani yenethiwekhi ukuze idlule idlule ngenkathi icindezela okokusebenza. Ngokungafani namasu omdabu wokushisisa, ngokuvamile asebenzisa ukushisisa okukhazimulayo komzimba wokushisisa, i-SPS isebenzisa umphumela oshisayo wamandla kagesi amakhulu adlula isikhunta noma isampula eqhubayo ukushisa okokusebenza. Ukuze uthole amasampula okushisa, i-graphite ene-conductivity kagesi enhle ivame ukusetshenziswa njenge-mold material, futhi ukushisa kokumelana kwesikhunta kusetshenziselwa ukwenza isampula ikhuphuke ngokushesha. Kumasampula e-conductive, isikhunta esivikelayo singasetshenziselwa ukushisisa i-current ngqo ngesampula. Izinga lokushisa lingafinyelela ku-1000 ℃ / min. Lapho izinga lokushisa lesampula lifinyelela inani elimisiwe, ukucwilisa kungaqedwa ngemva kwesikhathi esifushane sokulondoloza ukushisa.
Ubuchwepheshe be-SPS bunobuhle bezinga lokushisa eliphansi le-sintering, isikhathi esifushane sokubamba, izinga lokushisa elisheshayo, ingcindezi ye-sintering eguquguqukayo, kanye nokuhlanganiswa kwe-multi-field (electric-mechanical-thermal).
I-Flash sintering (FS)
Ubuchwepheshe be-FS babikwa okokuqala ngo-2010 ngu-Cologna et al wase-University of Colorado, ngokusekelwe ocwaningweni lobuchwepheshe be-metal-assisted metal powder sintering (FAST)
Ubuchwepheshe be-FS ikakhulukazi buhilela amapharamitha ezinqubo ezintathu, okungukuthi izinga lokushisa lomlilo (Tf), ukuqina kwenkundla (E) kanye nokwamanje (J). Umfanekiso 3C ubonisa ukuhlukahluka kwepharamitha ngayinye kunqubo ye-FS yendabuko. Kule modi, inkambu kagesi eqinile isetshenziswa ezintweni futhi izinga lokushisa lesithando somlilo likhuphuka ngezinga eliqhubekayo. Lapho izinga lokushisa lomlilo liphansi, ukumelana kwezinto ezibonakalayo kuphezulu futhi okwamanje okugeleza ngezinto ezibonakalayo kuncane. Ngokukhuphuka kwezinga lokushisa lesithando somlilo, ukumelana nesampula kuyehla futhi okwamanje kuyanda kancane kancane. Lesi sigaba sibizwa ngokuthi yi-incubation stage kanti uhlelo lulawulwa yi-voltage. Lapho izinga lokushisa lesithando somlilo likhuphukela ekushiseni okubucayi, ukumelana kwezinto ezibonakalayo kwehla ngokuzumayo, okwamanje kuphakama kakhulu, futhi i-FS iyenzeka. Njengoba amandla enkambu esazinzile ngalesi sikhathi, amandla esistimu (W = EJ) azofinyelela ngokushesha umkhawulo wamandla wokunikezwa kwamandla, futhi uhlelo luzoshintsha kusukela ekulawuleni i-voltage kuya ekulawuleni kwamanje, okubizwa ngokuthi isiteji se-FS. Lapho ukuphikiswa kwezinto kungavuki, amandla ensimu aphinde azinzise, futhi i-sintering ingena esiteji esizinzile, okungukuthi, isigaba se-insulation se-FS. Ngemva kwesigaba sokufakelwa, inqubo ephelele ye-FS iyaphela.
Uma kuqhathaniswa ne-sintering yendabuko, i-FS inezinzuzo ezilandelayo: nciphisa isikhathi se-sintering futhi unciphise izinga lokushisa lomlilo elidingekayo ukuze kufakwe i-sintering, ukuvimbela ukukhula okusanhlamvu, kungafinyelela ukulinganisa okungalingani, imishini elula, izindleko eziphansi.
Isikhathi sokuthumela: Jun-07-2022