Iyini i-SiC coating?

Izindwangu ze-Silicon Carbide (SiC).zidingeka ngokushesha ezinhlelweni zokusebenza ezahlukahlukene ngenxa yezakhiwo zazo ezimangalisayo zomzimba namakhemikhali. Isetshenziswa ngamasu afana nePhysical noma Chemical Vapor Deposition (CVD), noma izindlela zokufafaza,Izingubo ze-SiCukuguqula izakhiwo ezingaphezulu zezingxenye, enikeza ukuqina okuthuthukisiwe kanye nokumelana nezimo ezimbi kakhulu.

Kungani i-SiC Coatings?
I-SiC idume ngephuzu layo eliphezulu lokuncibilika, ubulukhuni obungavamile, kanye nokumelana okuphakeme nokugqwala kanye ne-oxidation. Lezi zimfanelo zenzaIzingubo ze-SiCngempumelelo ikakhulukazi ukumelana nezimo ezinzima okuhlangatshezwane nazo ezimbonini ze-aerospace kanye nezokuvikela. Ngokukhethekile, ukumelana okuhle kakhulu kokukhishwa kwe-SiC emazingeni okushisa aphakathi kuka-1800-2000°C kuyenza ibe inketho ekahle ezinhlelweni ezidinga ukuphila isikhathi eside nokwethembeka ngaphansi kokushisa okukhulu nokucindezeleka komshini.
Izindlela Ezivamile zeI-SiC CoatingIsicelo:
1.Chemical Vapor Deposition (CVD):
I-CVD iyindlela evamile lapho ingxenye okufanele iboshwe ifakwe eshubhu lokusabela. Kusetshenziswa i-Methyltrichlorosilane (MTS) njengesandulela, i-SiC ifakwa endaweni yengxenye emazingeni okushisa asukela ku-950-1300°C ngaphansi kwezimo zokucindezela okuphansi. Le nqubo iqinisekisa umfaniswano,izinga eliphezulu le-SiC enamathela, okuthuthukisa ukuqina kwengxenye neminyaka yokuphila.

2.I-Precursor Impregnation kanye nePyrolysis (PIP):
Le ndlela ihilela ukwelashwa kwangaphambili kwengxenye okulandelwa yi-vacuum impregnation kusixazululo sesandulela se-ceramic. Ngemuva kokukhulelwa, ingxenye ithola i-pyrolysis esithandweni, lapho ipholiswa khona ekamelweni lokushisa. Umphumela uba ukunamathela okuqinile kwe-SiC enikeza isivikelo esivelele ekugugeni nokuguguleka.

Izinhlelo zokusebenza kanye nezinzuzo:
Ukusetshenziswa kwezingubo ze-SiC kwandisa ukuphila kwezingxenye ezibalulekile futhi kunciphisa izindleko zokunakekela ngokunikeza ungqimba oluqinile, oluvikelayo oluvikela ukucekelwa phansi kwemvelo. Emkhathini, isibonelo, lezi zimbozo zibaluleke kakhulu ekuvikeleni ukushaqeka okushisayo nokugqokwa kwemishini. Emishinini yezempi, i-SiC coatings ithuthukisa ukwethembeka nokusebenza kwezingxenye ezibalulekile, iqinisekisa ubuqotho bokusebenza ngisho nangaphansi kwezimo ezinzima kakhulu.
Isiphetho:
Njengoba izimboni ziqhubeka nokuphusha imingcele yokusebenza nokuqina, ukumbozwa kwe-SiC kuzodlala indima ebalulekile ekuthuthukisweni kwesayensi yezinto zokwakha nobunjiniyela. Ngocwaningo oluqhubekayo nokuthuthukiswa, i-SiC coatings ngokungangabazeki izokwandisa ukufinyelela kwayo, ibeke izindinganiso ezintsha ekugqokeni okuphezulu kokusebenza.