Lefapheng le leholo la saense ea thepa, li-ceramics tsa silicon carbide li fetohile "moratuoa" oa masimo a mangata a theknoloji e phahameng ka lebaka la thepa ea bona e babatsehang e kang boima bo phahameng, matla a phahameng, botsitso bo botle ba mocheso, le botsitso ba lik'hemik'hale. Ho tloha sebakeng sa sefofane ho ea ho tlhahiso ea semiconductor, ho tloha likoloing tse ncha tsa matla ho ea ho mechini ea indasteri, li-ceramics tsa silicon carbide li bapala karolo ea bohlokoahali. Ha ho etsoa li-ceramics tsa silicon carbide, mokhoa oa sintering ke ntlha ea bohlokoa e khethollang thepa ea eona le mefuta ea ts'ebeliso. Kajeno, re tla shebana le ts'ebetso ea sintering ea silicon carbide mme re tsepamise maikutlo ho lekola melemo e ikhethang ea reaction sintered.li-ceramics tsa silicon carbide.
Mekhoa e tloaelehileng ea sintering bakeng sa silicon carbide
Ho na le mekhoa e fapaneng ea sintering bakeng sa silicon carbide, e 'ngoe le e' ngoe e na le melao-motheo le litšobotsi tsa eona tse ikhethang.
1. Mocheso oa ho hatisa sintering: Mokhoa ona oa sintering o kenyelletsa ho beha phofo ea silicon carbide ka har'a hlobo, ho sebelisa khatello e itseng ha u ntse u futhumatsa, ho phethahatsa mekhoa ea ho bōpa le ea sintering ka nako e le 'ngoe. Sintering e chesang e chesang e ka fumana lirafshoa tse teteaneng tsa silicon carbide mochesong o batlang o le tlase le ka nako e khuts'oane, ka boholo bo botle ba lijo-thollo le thepa e ntle ea mochini. Leha ho le joalo, thepa ea ho hatisa e chesang e rarahane, litšenyehelo tsa hlobo li phahame, litlhoko tsa ts'ebetso ea tlhahiso li thata, 'me likarolo tse bonolo feela tse bōpehileng li ka lokisoa, tse hlahisang katleho e tlaase ea tlhahiso, eo ka tekanyo e itseng e fokotsang tšebeliso ea eona e kholo.
2. Atmospheric pressure sintering: Atmospheric pressure sintering ke mokhoa oa densification sintering ea silicon carbide ka ho e futhumatsa ho 2000-2150 ℃ tlas'a khatello ea sepakapaka le maemo a sepakapaka a inert, ka ho eketsa lithuso tse loketseng tsa sintering. E arotsoe ka mekhoa e 'meli: solid-state sintering le liquid-phase sintering. Sintering e tiileng ea karolo e ka finyella sesupo se phahameng sa silicon carbide, se se nang karolo ea khalase pakeng tsa likristale, le thepa e babatsehang ea mechine e phahameng ea mocheso; Liquid phase sintering e na le melemo ea mocheso o tlase oa sintering, boholo ba lijo-thollo tse nyane, le matla a ntlafetseng a ho kobeha le ho thatafala ha fracture. Atmospheric pressure sintering ha e na lithibelo mabapi le sebopeho sa sehlahisoa le boholo, litšenyehelo tse tlase tsa tlhahiso, le thepa e felletseng ea thepa, empa mocheso oa sintering o phahame mme tšebeliso ea matla e phahame.
3. Reaction sintering: Reaction sintered silicon carbide e ile ea hlahisoa ka lekhetlo la pele ke P. Popper ka bo-1950. Ts'ebetso ena e kenyelletsa ho kopanya mohloli oa carbon le silicon carbide powder, le ho lokisa 'mele o motala ka mekhoa e kang ho bopa ente, ho hatella ka mokhoa o omileng, kapa ho hatella isostatic ho batang. Ebe, billet e futhumatsoa ka holimo ho 1500 ℃ tlas'a vacuum kapa inert atmosphere, ka nako eo silicon e tiileng e qhibiliha ka har'a silicon ea metsi, e kenang ka har'a billet e nang le li-pores ka liketso tsa capillary. Silicon ea metsi kapa mouoane oa silicon o na le lik'hemik'hale tse nang le C 'meleng o motala,' me in-situ e hlahisoang β - SiC e kopanya le likaroloana tsa pele tsa SiC 'meleng o motala ho etsa reaction sintered silicon carbide ceramic materials.
Melemo ea Reaction Sintering Silicon Carbide Ceramics
Ha ho bapisoa le mekhoa e meng ea sintering, li-ceramics tsa sintered silicon carbide li na le melemo e mengata ea bohlokoa:
1. Mocheso o tlase oa sintering le litšenyehelo tse laolehang: Therabelo ea sintering mocheso hangata e tlase ho feta mocheso oa sepakapaka sa sintering, e fokotsa haholo tšebeliso ea matla le litlhoko tse phahameng tsa ts'ebetso ea mocheso bakeng sa lisebelisoa tsa sintering. Mocheso o tlase oa sintering o bolela litšenyehelo tse tlase tsa tlhokomelo ea lisebelisoa le ho fokotsa tšebeliso ea matla nakong ea ts'ebetso ea tlhahiso, ka katleho ho fokotsa litšenyehelo tsa tlhahiso. Sena se etsa hore li-ceramics tsa sintered silicon carbide li be le melemo ea moruo tlhahisong e kholo.
2. Haufi le ho etsa boholo ba marang-rang, ho loketse mekhoa e rarahaneng: Nakong ea ts'ebetso ea sintering, thepa ha e khone ho fokotseha ha molumo. Tšobotsi ena e etsa hore e tšoanelehe ka ho khetheha bakeng sa ho lokisetsa likaroloana tsa sebopeho sa boholo bo boholo, bo rarahaneng. Ebang ke likarolo tse nepahetseng tsa mochini kapa lisebelisoa tse kholo tsa indasteri, li-ceramics tsa sintered silicon carbide li ka fihlela litlhoko tsa moralo ka nepo, tsa fokotsa mehato e latelang ea ts'ebetso, tsa ntlafatsa katleho ea tlhahiso, hape li fokotsa tahlehelo ea thepa le keketseho ea litšenyehelo e bakoang ke ho sebetsa.
3. Tekanyo e phahameng ea densification ea lintho tse bonahalang: Ka ho laola maemo a karabelo ka mokhoa o utloahalang, reaction sintering e ka finyella tekanyo e phahameng ea densification ea silicon carbide ceramics. Sebopeho se teteaneng se fana ka thepa e nang le lisebelisoa tse ntle haholo tsa mochine, tse kang matla a holimo a ho koba le matla a ho hatella, ho li nolofalletsa ho boloka botšepehi ba sebopeho tlas'a matla a bohlokoa a ka ntle. Ka nako e ts'oanang, sebopeho se teteaneng se boetse se ntlafatsa ho hanyetsa le ho senya ha thepa, ho e lumella hore e sebetse ka mokhoa o tsitsitseng libakeng tse thata tsa ho sebetsa le ho lelefatsa bophelo ba eona ba tšebeletso.
4. Botsitso bo botle ba lik'hemik'hale: Reaction sintered silicon carbide ceramics e na le khanyetso e babatsehang ea li-acid tse matla le tšepe e qhibilihisitsoeng. Liindastering tse kang lik'hemik'hale le metallurgical, hangata lisebelisoa li hloka ho kopana le mecha ea litaba e fapaneng e senyang. Reaction sintered silicon carbide ceramics e ka hanela khoholeho ea mecha ea litaba, ea netefatsa ts'ebetso e tloaelehileng ea lisebelisoa, ea fokotsa litšenyehelo tsa tlhokomelo le phetisetso, le ho ntlafatsa tsoelo-pele ea tlhahiso le botsitso.
E sebetsa haholo libakeng tse fapaneng
Ka melemo ena, karabelo sintered silicon carbide ceramics e 'nile ea sebelisoa haholo mafapheng a mangata. Sebakeng sa lisebelisoa tsa sebōpi se nang le mocheso o phahameng, se ka mamella maemo a mocheso o phahameng le ho netefatsa ts'ebetso e nepahetseng ea li-kilns; Ka li-exchangers tsa mocheso, mokhoa oa bona o motle oa ho futhumatsa mocheso le ho hanyetsa ha kutu ho ba etsa khetho e nepahetseng ea thepa; Lisebelisoa tsa ts'ireletso ea tikoloho tse kang li-nozzles tsa desulfurization, li ka hanela khoholeho ea mecha ea litaba e senyang le ho netefatsa ts'ebetso e tsitsitseng ea nako e telele ea thepa. Ntle le moo, li-ceramics tsa reaction sintered silicon carbide le tsona li phetha karolo ea bohlokoa masimong a maemo a holimo joalo ka photovoltaics le aerospace.
Li-ceramics tsa silicon carbide tsa Reaction sintered li nka boemo ba bohlokoa lelapeng la silicon carbide ceramic ka lebaka la melemo ea tsona e ikhethang. Ka tsoelo-pele e tsoelang pele ea thekenoloji le ts'ebetso e tsoelang pele ea ts'ebetso, ho lumeloa hore li-ceramics tsa sintered silicon carbide li tla bontša ts'ebetso ea tsona e babatsehang mafapheng a mangata, li fana ka tšehetso e matla ea thepa bakeng sa nts'etsopele ea liindasteri tse fapa-fapaneng.
Nako ea poso: Jun-13-2025