Silicon carbide thiab silicon nitride tsis ntub dej nrog cov hlau yaj. Ntxiv rau qhov raug nkag mus los ntawm magnesium, nickel, chromium alloy thiab stainless hlau, lawv tsis ntub dej rau lwm yam hlau, yog li lawv muaj kev tiv thaiv corrosion zoo heev thiab siv dav hauv kev lag luam electrolysis txhuas.
Hauv tsab ntawv no, qhov kev tiv thaiv corrosion ntawm recrystallized silicon carbide R-SiC thiab silicon nitride bonded silicon carbide Si3N4-SiC hauv cov kub-circulating Al-Si alloy melts tau tshawb nrhiav los ntawm ntau latitudes.
Raws li cov ntaub ntawv sim ntawm 9 zaug ntawm kev caij tsheb kauj vab thermal ntawm 1080h hauv 495 ° C ~ 620 ° C txhuas-silicon alloy yaj, cov txiaj ntsig kev tshuaj xyuas hauv qab no tau txais.
Cov qauv R-SiC thiab Si3N4-SiC nce ntxiv nrog lub sijhawm xeb thiab qhov nrawm xeb txo qis. Qhov nrawm xeb raws li kev sib raug zoo logarithmic ntawm kev txo qis. (daim duab 1)
Los ntawm kev tshuaj xyuas lub zog spectrum, cov qauv R-SiC thiab Si3N4-SiC lawv tus kheej tsis muaj txhuas-silicon; hauv tus qauv XRD, qee qhov ntawm txhuas-silicon ncov yog qhov seem ntawm cov hlau txhuas-silicon. (Daim Duab 2 - Daim Duab 5)
Los ntawm kev tshuaj xyuas SEM, thaum lub sijhawm xeb nce ntxiv, cov qauv tag nrho ntawm R-SiC thiab Si3N4-SiC cov qauv yog xoob, tab sis tsis muaj kev puas tsuaj pom tseeb. (Daim Duab 6 - Daim Duab 7)
Qhov nro ntawm qhov chaw σs/l>σs/g ntawm qhov sib txuas ntawm cov kua txhuas thiab cov khoom siv ceramic, lub kaum sab xis θ ntawm qhov sib txuas yog >90 °, thiab qhov sib txuas ntawm cov kua txhuas thiab cov ntaub ntawv ceramic tsis ntub.
Yog li ntawd, cov ntaub ntawv R-SiC thiab Si3N4-SiC zoo heev hauv kev tiv thaiv corrosion tiv thaiv aluminium silicon yaj thiab muaj qhov sib txawv me ntsis. Txawm li cas los xij, tus nqi ntawm cov ntaub ntawv Si3N4-SiC yog qhov qis thiab tau siv tau zoo rau ntau xyoo.
Lub sijhawm tshaj tawm: Lub Kaum Ob Hlis-17-2018