Zadothi zapadera zimatanthawuza gulu lazoumba zomwe zimakhala ndi makina apadera, thupi kapena mankhwala, zipangizo zomwe zimagwiritsidwa ntchito ndi teknoloji yopangira zofunikira ndizosiyana kwambiri ndi zoumba ndi chitukuko. Malinga ndi mawonekedwe ndi ntchito, zida zadothi zapadera zitha kugawidwa m'magulu awiri: zoumba zoumba ndi ziwiya zogwirira ntchito. Pakati pawo, zoumba zadothi zimatanthawuza za ceramics zomwe zingagwiritsidwe ntchito ngati zida zomangira zomangamanga, zomwe nthawi zambiri zimakhala ndi mphamvu zambiri, kuuma kwakukulu, modulus zotanuka kwambiri, kukana kutentha, kukana kuvala, kukana dzimbiri, kukana makutidwe ndi okosijeni, kukana kugwedezeka kwamafuta ndi zina.
Pali mitundu yambiri yazitsulo zamapangidwe, zabwino ndi zovuta zake, komanso momwe amagwiritsira ntchito ubwino ndi zovuta zake ndizosiyana, zomwe "silicon nitride ceramics" chifukwa cha kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe kabwino
Ubwino wa silicon nitride ceramics
Silicon nitride (Si3N4) ikhoza kugawidwa kukhala covalent bond compounds, ndi [SiN4] 4-tetrahedron monga gawo lachipangidwe. Malo enieni a maatomu a nayitrogeni ndi silicon amatha kuwoneka kuchokera pa chithunzi pansipa, silicon ili pakatikati pa tetrahedron, ndipo malo a vertices anayi a tetrahedron amakhala ndi maatomu a nayitrogeni, ndiyeno ma tetrahedron atatu aliwonse amagawana atomu imodzi, nthawi zonse akukwera mu danga la mbali zitatu. Pomaliza, dongosolo la maukonde limapangidwa. Zambiri mwazinthu za silicon nitride zimagwirizana ndi mawonekedwe a tetrahedral.
Pali mitundu itatu ya crystalline ya silicon nitride, yomwe ndi α, β ndi γ magawo, omwe α ndi β magawo ndi mitundu yambiri ya silicon nitride. Chifukwa maatomu a nayitrogeni amalumikizana kwambiri, silicon nitride ili ndi mphamvu zabwino kwambiri, kuuma kwakukulu komanso kukana kutentha kwambiri, ndipo kuuma kumatha kufika HRA91 ~ 93; Good matenthedwe kuuma, akhoza kupirira kutentha kwa 1300 ~ 1400 ℃; Kachitidwe kakang'ono ka mankhwala ndi carbon ndi zitsulo zinthu kumabweretsa otsika mikangano coefficient; Imadzipaka mafuta ndipo chifukwa chake imalimbana ndi kuvala; Kukana kwa dzimbiri ndi kolimba, kuwonjezera pa hydrofluoric acid, sikuchita ndi ma inorganic acid, kutentha kwakukulu kumakhalanso kukana kwa okosijeni; Ilinso ndi kukana kwamphamvu kwamafuta, kuziziritsa kwakuthwa mumlengalenga kenako Kutentha kwakuthwa sikungagwe; Kukwera kwa silicon nitride ceramics kumachepa kutentha kwambiri, ndipo kupindika kwa pulasitiki pang'onopang'ono kumakhala kochepa chifukwa cha kutentha kwakukulu ndi katundu wokhazikika.
Kuphatikiza apo, silicon nitride ceramics ilinso ndi mphamvu zenizeni, mawonekedwe apamwamba kwambiri, matenthedwe apamwamba kwambiri, magetsi abwino kwambiri ndi zabwino zina, motero imakhala ndi mtengo wapadera wogwiritsa ntchito m'malo owopsa kwambiri monga kutentha kwambiri, kuthamanga kwambiri, media zowononga kwambiri, ndipo imatengedwa kuti ndi imodzi mwazinthu zopanga zida za ceramic zomwe zimathandizira pakukulitsa ndikugwiritsa ntchito, ndipo nthawi zambiri zimakhala chisankho choyamba pamayesero ambiri omwe amafunikira kuyesedwa.
Nthawi yotumiza: Aug-15-2023