Yintoni ukoleka kweSiC?

Iingubo zeSilicon Carbide (SiC).zikhawuleza ukuba ziyimfuneko kwizicelo ezahlukeneyo zokusebenza okuphezulu ngenxa yeempawu zazo ezimangalisayo zomzimba kunye neekhemikhali. Isetyenziswa ngeendlela ezinje ngePhysical or Chemical Vapor Deposition (CVD), okanye iindlela zokutshiza,Iingubo zeSiCukuguqula iipropati zomphezulu wamacandelo, ukunika ukuqina okuphuculweyo kunye nokumelana neemeko ezigqithisileyo.

Kutheni i-SiC Coatings?
I-SiC yaziwa ngokuba yindawo ephezulu yokunyibilika, ubulukhuni obukhethekileyo, kunye nokumelana okuphezulu kokubola kunye ne-oxidation. Ezi mpawu zenzaIingubo zeSiCesebenza ngokukodwa ekumelaneni neemeko ezingqongileyo ezinzima ekudityanwa nazo kwi-aerospace kunye nemizi-mveliso yokhuselo. Ngokukodwa, ukuxhathisa okugqwesileyo kwe-SiC kwe-ablation kumaqondo obushushu phakathi kwe-1800-2000 ° C kuyenza ibe lolona khetho lufanelekileyo kwizicelo ezifuna ubomi obude kunye nokuthembeka phantsi kobushushu obukhulu kunye noxinzelelo lomatshini.
Iindlela eziqhelekileyo zeI-SiC CoatingIsicelo:
1.I-Chemical Vapor Deposition (CVD):
I-CVD yindlela exhaphakileyo apho icandelo eliza kugqunywa lifakwe kwityhubhu yokusabela. Ukusebenzisa i-Methyltrichlorosilane (MTS) njenge-precursor, i-SiC ifakwe kwindawo yecandelo kwiqondo lokushisa ukusuka kwi-950-1300 ° C phantsi kweemeko eziphantsi koxinzelelo. Le nkqubo iqinisekisa iyunifomu,umgangatho ophezulu we-SiC wokugquma, ukuphucula ukomelela kwecandelo kunye nobomi.

2.I-Precursor Impregnation kunye nePyrolysis (PIP):
Le ndlela ibandakanya unyango lwangaphambili lwecandelo elilandelwa yi-vacuum impregnation kwisisombululo se-ceramic precursor. Emva kokukhulelwa, inxalenye ingena kwi-pyrolysis kwisithando somlilo, apho ipholile kwiqondo lokushisa. Isiphumo sisigqubuthelo esiqinileyo seSiC esibonelela ngokhuseleko olubalaseleyo ekunxibeni nasekukhukuliseni.

Usetyenziso kunye nezinto eziluncedo:
Ukusetyenziswa kwee-coatings ze-SiC kwandisa ubomi bamacandelo abalulekileyo kunye nokunciphisa iindleko zokugcina ngokubonelela ngobunzima, umaleko okhuselayo okhusela ukuthotywa kokusingqongileyo. Kwi-aerospace, umzekelo, ezi zogquma zibaluleke kakhulu ekukhuseleni ukothuka kwe-thermal kunye nokunxiba komatshini. Kwizixhobo zomkhosi, iingubo ze-SiC zongeza ukuthembeka kunye nokusebenza kweendawo ezibalulekileyo, ukuqinisekisa ukuthembeka kokusebenza naphantsi kweemeko ezinzima.
Isiphelo:
Njengoko amashishini eqhubeka nokutyhala imida yokusebenza kunye nokuqina, iingubo ze-SiC ziya kudlala indima ebalulekileyo ekuphuhliseni isayensi yezinto kunye nobunjineli. Ngophando oluqhubekayo kunye nophuhliso, iingubo ze-SiC ngokungathandabuzekiyo ziya kwandisa ukufikelela kwazo, ukubeka imigangatho emitsha kwiingubo eziphezulu zokusebenza.