Ingaruka yibirimo bya karubone kuri microstructure ya reaction-yacuzwe na silicon karbide

Ibiri muri karubone byavunitse byintangarugero biratandukanye, hamwe na karubone ya A-2.5 awt.% Muri uru rwego, ikora ibintu byuzuye bitagira imyenge hafi ya byose, bigizwe na karubide ya silikoni ikwirakwizwa hamwe na silikoni yubusa. Hamwe no kwiyongera kwa karubone, ibikubiye muri reaction ya sikoroni ya karubide yiyongera buhoro buhoro, ingano ya karbide ya silicon yiyongera, kandi karbide ya silicon ihujwe hamwe muburyo bwa skeleton. Nyamara, ibintu byinshi bya karubone birashobora kuganisha byoroshye karubone isigaye mumubiri. Iyo karubone yumukara irushijeho kwiyongera kuri 3a, gucumura kwicyitegererezo ntabwo byuzuye, kandi "interlayers" yirabura igaragara imbere.

Iyo karubone ikora hamwe na silikoni yashongeshejwe, igipimo cyayo cyo kwaguka ni 234%, ibyo bigatuma microstructure ya reaction-sinteri ya silicon karbide ifitanye isano rya bugufi nibiri muri karubone. Iyo karubone iri muri bilet iba ntoya, karbide ya silicon iterwa na reaction ya silicon-karubone ntabwo iba ihagije kugirango yuzuze imyenge ikikije ifu ya karubone, bivamo silikoni yubusa muri sample. Hamwe no kwiyongera kwa karubone muri bilet, karbide ya silicon ya reaction irashobora kuzuza byuzuye imyenge ikikije ifu ya karubone kandi igahuza karbide yumwimerere hamwe. Muri iki gihe, ibirimo silikoni yubusa muri sample iragabanuka kandi ubucucike bwumubiri wacumuye bwiyongera. Nyamara, iyo hari karubone nyinshi muri bilet, karbide ya kabiri ya silicon iterwa nigisubizo hagati ya karubone na silikoni ikikiza vuba tonier, bigatuma silikoni yashongeshejwe ihura na toner, bikaviramo karubone isigaye mumubiri wacumuye.

Ukurikije ibisubizo bya XRD, icyiciro kigizwe na reaction-yacumuye sic ni α-SiC, β-SiC na silicon yubusa.

Muburyo bwubushyuhe bwo hejuru bwo gucumura, atome ya karubone yimukira muburyo bwambere hejuru ya SiC surface-SiC hakoreshejwe silicon yashongeshejwe α-kabiri. Kubera ko silikoni-karubone isanzwe ari reaction ya exothermic reaction hamwe nubushyuhe bwinshi bwa reaction, gukonjesha byihuse nyuma yigihe gito cyubushyuhe bwo hejuru bwihuse byongera susaturation ya karubone yashonga muri silikoni yamazi, kuburyo uduce β-SiC twaguye muri buryo bwa karubone, bityo bikazamura imiterere yubukorikori bwibikoresho. Kubwibyo, icyiciro cya kabiri β-SiC gutunganya ingano ningirakamaro mugutezimbere imbaraga zunama. Muri sisitemu yo guhuza Si-SiC, ibirimo silikoni yubusa mubikoresho bigabanuka hamwe no kwiyongera kwa karubone mubikoresho fatizo.

Umwanzuro:

. Agaciro pH ni alkaline kandi igenda yiyongera buhoro buhoro.

. Iyo ingano yumukara wa karubone yikubye inshuro 2,5 yumubare wambere, imbaraga zingingo zitatu zunama hamwe nubucucike bwinshi bwicyatsi kibisi nyuma yo gucumura ni hejuru cyane, ni 227.5mpa na 3.093g / cm3.

. Impamvu yo kumeneka ni uko gaze ya silicon oxyde ikorwa mugikorwa cyo gucumura reaction ntabwo byoroshye gusohora, buhoro buhoro kwirundanya, umuvuduko urazamuka, kandi ingaruka za jacking zitera gucamo fagitire. Mu gace ka "sandwich" kirabura imbere muri sinter, hari karuboni nyinshi itagira uruhare mubitekerezo.