Li-ceramics tse khethehileng li bua ka sehlopha sa li-ceramics tse nang le thepa e khethehileng ea mechine, ea 'mele kapa ea lik'hemik'hale, lisebelisoa tse tala tse sebelisoang le theknoloji e hlokahalang ea tlhahiso li fapane haholo le li-ceramics tse tloaelehileng le nts'etsopele. Ho ea ka litšoaneleho le litšebeliso, li-ceramics tse khethehileng li ka aroloa ka mekhahlelo e 'meli: li-ceramics tsa mohaho le li-ceramics tse sebetsang. Har'a tsona, li-ceramics tsa sebopeho li bua ka li-ceramics tse ka sebelisoang e le lisebelisoa tsa meralo ea boenjiniere, tseo ka kakaretso li nang le matla a phahameng, boima bo phahameng, modulus e phahameng ea elastic, ho hanyetsa mocheso, ho hanyetsa ho roala, ho hanyetsa kutu, ho hanyetsa oxidation, ho hanyetsa mocheso oa mocheso le litšobotsi tse ling.
Ho na le mefuta e mengata ea lirafshoa tsa meralo, melemo le bofokoli, 'me tataiso ea tšebeliso ea melemo le bofokoli e fapane, eo "silicon nitride ceramics" ka lebaka la ts'ebetso e leka-lekaneng likarolong tsohle, e tsejoa e le ts'ebetso e phethahetseng ka ho fetisisa lelapeng la lirafshoa tsa meralo, 'me e na le mefuta e mengata ea likopo.
Melemo ea silicon nitride ceramics
Silicon nitride (Si3N4) e ka aroloa ka metsoako ea covalent bond, e nang le [SiN4] 4-tetrahedron e le yuniti ea sebopeho. Maemo a khethehileng a liathomo tsa naetrojene le silicon li ka bonoa setšoantšong se ka tlase, silicon e bohareng ba tetrahedron, 'me maemo a li-vertices tse' nè tsa tetrahedron a tšoaroa ke liathomo tsa naetrojene, 'me joale tetrahedron e' ngoe le e 'ngoe e arolelanoa athomo e le' ngoe, e lula e atoloha sebakeng sa mahlakore a mararo. Qetellong, mohaho oa marang-rang o thehoa. Lintho tse ngata tsa silicon nitride li amana le sebopeho sena sa tetrahedral.
Ho na le likarolo tse tharo tsa kristale tsa silicon nitride, e leng mekhahlelo ea α, β le γ, eo mekhahlelo ea α le β e leng mefuta e tloaelehileng ea silicon nitride. Hobane liathomo tsa naetrojene li kopantsoe ka thata, silicon nitride e na le matla a phahameng a phahameng, boima bo phahameng le ho hanyetsa mocheso o phahameng, 'me boima bo ka fihla HRA91 ~ 93; E ntle ea mocheso o tsitsitseng, o ka mamella mocheso o phahameng oa 1300 ~ 1400 ℃; Karabelo e nyane ea lik'hemik'hale ka likarolo tsa carbon le tšepe e lebisa ho coefficient e tlase ea likhohlano; E itlholisa ka bo eona 'me ka hona e hana ho apara; Ho hanyetsa kutu ho matla, ho phaella ho hydrofluoric acid, ha e sebetsane le li-inorganic acid tse ling, mocheso o phahameng o boetse o na le khanyetso ea oxidation; E boetse e na le khanyetso e ntle ea mocheso oa mocheso, pholileng e bohale moeeng 'me joale ho futhumatsa ho matla ho ke ke ha senyeha; Ho phatloha ha li-ceramics tsa silicon nitride ho fokotseha ka mocheso o phahameng, 'me deformation e liehang ea polasetiki e nyenyane tlas'a ketso ea mocheso o phahameng le mojaro o tsitsitseng.
Ntle le moo, li-ceramics tsa silicon nitride le tsona li na le matla a phahameng a khethehileng, mokhoa o phahameng haholo, mocheso o phahameng oa mocheso, thepa e ntle ea motlakase le melemo e meng, ka hona e na le boleng bo ikhethang ba ts'ebeliso tikolohong e feteletseng joalo ka mocheso o phahameng, lebelo le phahameng, mecha ea litaba e senyang, 'me e nkuoa e le e' ngoe ea lisebelisoa tse tšepisang ka ho fetesisa tsa ceramic bakeng sa nts'etsopele le ts'ebeliso, 'me hangata e ba khetho ea pele lits'ebetsong tse ngata tse lekiloeng.
Nako ea poso: Aug-15-2023