Njengenxalenye ebalulekileyo yezixhobo zobunjineli kunye nezinto ezisebenzayo, izinto eziphuculweyo ze-ceramic zineembono ezibanzi zokusetyenziswa kumandla amatsha, unxibelelwano lwe-elektroniki, i-semiconductor, i-aerospace kunye nezinye iindawo zoshishino. Nangona kunjalo, ngenxa yokuba umgubo we-ceramic ubukhulu becala i-ionic bond okanye i-covalent bond ikhompawundi, inkqubo yesiko ye-sintering yokulungiselela ukuxinana.izinto ze-ceramicifuna ubushushu obuphezulu be-sintering kunye nexesha elide lokubamba, nto leyo ekhokelela ekukhuleni kweenkozo kunye nentsalela ye-porosity, kwaye emva koko ichaphazele iipropathi zeisitofu se-ceramic yokubumba. Ukuze kuncitshiswemetal sinteringubushushu, mfutshane sintering ixesha, ukuphucula ingxinano sintering kunye neempawu eziphathekayo, abaphandi baye baphuhlisa ezahlukeneyo zobugcisa sintering entsha.
I-Spark plasma sintering (SPS)
Itekhnoloji ye-SPS luhlobo olutsha lwetekhnoloji ye-sintering ekhawulezayo eye yaxhalabisa kwaye yafundwa kwihlabathi lezemfundo. IKHIWANE. I-1 ibonisa umgaqo wayo wokusebenza.
Itekhnoloji ye-SPS ibe nguvulindlela ekusungulweni kwe-dc pulse current kwiinkqubo sintering. I-indenter isebenza njengomphathi we-current ukuba adlule ngelixa usebenzisa uxinzelelo kwizinto eziphathekayo. Ngokungafaniyo neendlela zesiNtu zokutshisa, ezidla ngokusebenzisa ukufudumeza okukhazimlayo komzimba wokufudumeza, i-SPS isebenzisa ifuthe lobushushu bombane omkhulu odlula kumngundo okanye uqhuba isampulu ukufudumeza imathiriyeli. Iisampulu zokugquma, igraphite ene-conductivity elungileyo yombane idla ngokusetyenziswa njengesixhobo sokubumba, kunye nobushushu bokumelana nokungunda busetyenziselwa ukwenza isampulu inyuke ngokukhawuleza. Iisampulu conductive, ukungunda insulating ingasetyenziselwa ukufudumeza yangoku ngqo ngokusebenzisa isampuli. Izinga lokufudumeza linokufikelela kwi-1000 ℃ / min. Xa ubushushu besampulu bufikelela kwixabiso elimiselweyo, i-sintering ingagqitywa emva kwexesha elifutshane lokugcinwa kobushushu.
Itekhnoloji ye-SPS ineenzuzo zobushushu obuphantsi be-sintering, ixesha elifutshane lokubamba, izinga lokufudumeza ngokukhawuleza, uxinzelelo lwe-sintering oluguquguqukayo, kunye ne-multi-field coupling (i-electric-mechanical-thermal).
I-Flash sintering (FS)
Itekhnoloji ye-FS yaxelwa okokuqala ngo-2010 nguCologna et al ovela kwiYunivesithi yaseColorado, esekelwe kuphononongo lwetekhnoloji yokuncedisa i-metal powder sintering (FAST)
Itekhnoloji yeFS ikakhulu ibandakanya iiparameters zenkqubo ezintathu, ezizezi, ubushushu besithando somlilo (Tf), ubukhulu bendawo (E) kunye nesangoku (J). Umzobo 3C ubonisa ukuguquguquka kwendlela yeparameter nganye kwinkqubo yeFS yemveli. Kule modi, intsimi yombane ezinzileyo isetyenziswe kwizinto eziphathekayo kwaye ukushisa kwesithando somlilo kuphakama kwinqanaba eliqhubekayo. Xa ukushisa kwesithando somlilo kuphantsi, i-resistivity yezinto eziphathekayo iphezulu kwaye ikhoyo ngoku ejikelezayo kwizinto eziphathekayo zincinci. Ngokunyuka kobushushu beziko, ukuxhathisa kwesampulu kuncipha kwaye ukwanda kwangoku kancinci kancinci. Eli nqanaba libizwa ngokuba linqanaba lokufukamela kwaye inkqubo yombane ilawulwa. Xa ukushisa kwesithando somlilo kuphakama kwiqondo lokushisa elibalulekileyo, i-resistivity yezinto eziphathekayo iyancipha ngokukhawuleza, i-current iphakama ngokukhawuleza, kwaye i-FS iyenzeka. Ekubeni amandla entsimi asazinzile ngeli xesha, amandla enkqubo (W = EJ) aya kufikelela ngokukhawuleza kumda wamandla ombane, kwaye inkqubo iya kutshintsha ukusuka kulawulo lombane ukuya kulawulo lwangoku, olubizwa ngokuba yi-FS stage. Xa i-resistivity yezinto eziphathekayo ayivuki, amandla entsimi azinzisa kwakhona, kwaye i-sintering ingena kwinqanaba elizinzile, oko kukuthi, i-insulation stage ye-FS. Emva kwenqanaba lokugquma, inkqubo yeFS epheleleyo iphela.
Xa kuthelekiswa ne-sintering yendabuko, i-FS ineenzuzo ezilandelayo: ukunciphisa ixesha lokucima kunye nokunciphisa ukushisa kwesithando somlilo esifunekayo kwi-sintering, ukuvimbela ukukhula okuziinkozo, kunokufikelela kwi-non-equilibrium sintering, izixhobo ezilula, iindleko eziphantsi.
Ixesha lokuposa: Jun-07-2022