Silicon carbide (SiC) phofo ea ceramice na le melemo ea matla a mocheso o phahameng, khanyetso e ntle ea oxidation, khanyetso e phahameng ea ho apara le botsitso ba mocheso, coefficient e nyenyane ea ho atolosa mocheso, conductivity e phahameng ea mocheso, botsitso bo botle ba lik'hemik'hale, joalo-joalo Ka hona, hangata e sebelisoa ha ho etsoa likamore tse tukang, mocheso o phahameng oa mocheso lisebelisoa, li-patches tse hanyetsanang le mocheso, likarolo tsa enjene ea sefofane, likepe tse sebetsanang le lik'hemik'hale, li-tubes tse futhumatsang mocheso le likarolo tse ling tsa mochine tlas'a maemo a thata, 'me ke thepa ea boenjiniere e sebelisoang haholo.Ha e na karolo ea bohlokoa feela masimong a theknoloji e phahameng a ntseng a ntlafatsoa (joalo ka lienjine tsa ceramic, spacecraft, joalo-joalo), empa hape e na le mmaraka o pharaletseng le masimo a kopo a lokelang ho ntlafatsoa ka matla a hajoale, metallurgy, mechini, thepa ea moaho. , indasteri ea lik'hemik'hale le likarolo tse ling.

Mekhoa ea ho itokisa easilicon carbide phofoe ka aroloa haholo ka mekhahlelo e meraro: mokhoa o tiileng oa mohato, mokhoa oa mohato oa mokelikeli le mokhoa oa khase ea khase.

1. Mokhoa o tiileng oa mohato

Mokhoa o tiileng oa mohato o kenyelletsa haholo mokhoa oa ho fokotsa carbothermal le mokhoa oa karabelo ea silicon carbon direct.Mekhoa ea ho fokotsa carbothermal e boetse e kenyelletsa mokhoa oa Acheson, mokhoa oa sebōpi o otlolohileng le mokhoa o phahameng oa ho fetola mocheso.Silicon carbide phofoho lokisoa ho ile ha lokisoa qalong ka mokhoa oa Acheson, ho sebelisa coke ho fokotsa silicon dioxide mochesong o phahameng (hoo e ka bang 2400 ℃), empa phofo e fumanoang ka mokhoa ona e na le boholo bo boholo ba likaroloana (> 1mm), e sebelisa matla a mangata, 'me mokhoa ona ke. rarahane.Lilemong tsa bo-1980, lisebelisoa tse ncha tsa ho kopanya phofo ea β-SiC, tse kang sebōpi se otlolohileng le converter e phahameng ea mocheso, li ile tsa hlaha.Ha mokhoa o sebetsang le o khethehileng oa polymerization pakeng tsa microwave le lintho tsa lik'hemik'hale tse tiileng o ntse o hlakisoa butle-butle, theknoloji ea ho kopanya phofo ea sic ka ho futhumatsa ka microwave e se e hōlile ka ho fetisisa.The silicon carbon direct reaction method e boetse e kenyeletsa self-propagating high temperature synthesis (SHS) le mechanical alloying method.Mokhoa oa ho fokotsa mocheso oa SHS o sebelisa karabelo e makatsang lipakeng tsa SiO2 le Mg ho etsa khaello ea mocheso.Thesilicon carbide phofoe fumanoang ka mokhoa ona e na le bohloeki bo phahameng le boholo ba likaroloana tse nyenyane, empa Mg sehlahisoa se hloka ho tlosoa ka mekhoa e latelang e kang pickling.

2 mokhoa oa mokelikeli oa mohato

Mokhoa oa mohato oa mokelikeli o kenyelletsa mokhoa oa sol-gel le mokhoa oa ho bola oa polymer.Mokhoa oa Sol-gel ke mokhoa oa ho lokisa gel e nang le Si le C ka mokhoa o nepahetseng oa sol-gel, ebe pyrolysis le phokotso e phahameng ea mocheso oa carbothermal ho fumana silicon carbide.Ho senyeha ha mocheso o phahameng oa polymer ea manyolo ke thekenoloji e sebetsang hantle bakeng sa ho lokisetsa silicon carbide: e 'ngoe ke ho futhumatsa gel polysiloxane, karabelo ea ho bola ho lokolla li-monomer tse nyenyane,' me qetellong li theha SiO2 le C, ebe joale ka ho fokotsa carbon ho hlahisa phofo ea SiC;E 'ngoe ke ho futhumatsa polysilane kapa polycarbosilane ho lokolla li-monomer tse nyane ho etsa skeleton, ebe qetellong li theha.silicon carbide phofo.

3 Mokhoa oa khase ea khase

Hona joale, khase mohato synthesis easilicon carbideceramic ultrafine powder haholo-holo e sebelisa khase ea khase (CVD), Plasma Induced CVD, Laser Induced CVD le mekhoa e meng ea theknoloji ho senya lintho tse phelang ka mocheso o phahameng.Phofo e fumanoeng e na le melemo ea bohloeki bo phahameng, boholo ba karoloana e nyane, agglomeration e nyane le taolo e bonolo ea likarolo.Ke mokhoa o batlang o tsoetse pele hona joale, empa ka theko e phahameng le lihlahisoa tse tlaase, ha ho bonolo ho finyella tlhahiso ea bongata, 'me e loketse ho etsa lisebelisoa tsa laboratori le lihlahisoa tse nang le litlhoko tse khethehileng.

Hajoale, thesilicon carbide phofosebelisoa haholo-holo submicron kapa esita le nano boemo phofo, hobane phofo phatsa boholo ke tse nyenyane, phahameng holim'a mosebetsi, kahoo bothata bo ka sehloohong ke hore phofo ke ho le bonolo ho hlahisa agglomeration, ho ke ke ho hlokahala hore ho fetola holim'a phofo ho thibela kapa ho thibela ho. motsoako oa bobeli oa phofo.Hona joale, mekhoa ea ho hasana ha phofo ea SiC haholo-holo e kenyelletsa lihlopha tse latelang: ho fetola matla a matla a holimo, ho hlatsoa, ​​​​ho phekoloa ka li-dispersant ea phofo, phetoho ea ho roala ka tlhaho, phetoho ea ho roala ka manyolo.