Kakaretsotlhaloso eaBoitšoaroSiC e kopantsoeng
Reaction Bonded SiC e na le thepa ea mochini le khanyetso ea oxidation. Litšenyehelo tsa eona li batla li le tlaase. Sechabeng sa kajeno, e hohetse tlhokomelo e eketsehileng le ho feta indastering e fapaneng.
SiC ke tlamo e matla haholo ea covalent. Ho sintering, sekhahla sa phallo se tlase haholo. Ka nako e ts'oanang, bokaholimo ba likaroloana hangata bo koahela lera le tšesaane la oxide le phethang karolo ea mokoallo oa phallo. Pure SiC ha e na sintered le compact ntle le li-additives tsa sintering. Esita le haeba mokhoa oa ho hatisa ho chesang o sebelisoa, o tlameha ho khetha li-additives tse loketseng. Ke feela ka lithemparetjha tse phahameng haholo, ho ka fumanoang thepa e loketseng bakeng sa boima ba boenjiniere haufi le tekano ea theoretical e lokelang ho ba pakeng tsa 1950 ℃ le 2200 ℃. Ka nako e ts'oanang, sebopeho le boholo ba eona li tla fokotsoa. Leha li-composite tsa SIC li ka fumaneha ka ho beoa ha mouoane, e lekantsoe feela ho lokisa lisebelisoa tse tlase kapa tse tšesaane. Ka lebaka la nako e telele e khutsitseng, litšenyehelo tsa tlhahiso li tla eketseha.
Reaction Bonded SiC e qapiloe ka bo-1950 ke Popper. Molao-motheo oa mantlha ke:
Tlas'a ts'ebetso ea matla a capillary, silicon ea metsi kapa alloy ea silicon e nang le ts'ebetso e sebetsang e kenelletse ka har'a li-ceramics tse nang le khabone mme tsa theha silicon ea khabone. Silicon carbide e sa tsoa thehoa e hokahane le likaroloana tsa pele tsa silicon carbide in situ, 'me li-pores tse setseng ka har'a filler li tlatsitsoe ke moemeli oa ho ima ho phethela ts'ebetso ea densification.
Ha ho bapisoa le lits'ebetso tse ling tsa silicon carbide ceramics, ts'ebetso ea sintering e na le litšobotsi tse latelang:
Mocheso o tlaase oa ho sebetsa, nako e khutšoanyane ea ho sebetsa, ha ho hlokahale lisebelisoa tse khethehileng kapa tse theko e boima;
Reaction Bonded likarolo tse se nang shrinkage kapa phetoho ea boholo;
Mekhoa e fapaneng ea ho bōpa (extrusion, ente, ho hatella le ho tšela).
Ho na le mekhoa e meng ea ho bopa. Nakong ea sintering, boholo bo boholo le lihlahisoa tse rarahaneng li ka hlahisoa ntle le khatello ea maikutlo. Theknoloji ea Reaction Bonded ea silicon carbide e 'nile ea ithutoa ka halofo ea lekholo la lilemo. Theknoloji ena e fetohile e 'ngoe ea liindasteri tse fapa-fapaneng ka lebaka la melemo ea eona e ikhethang.
Nako ea poso: May-04-2018