Inzira enye zo gucumura za silicon karbide ceramics

Ceramics ya silicon karbide ifite imbaraga zubushyuhe bwinshi, irwanya ubushyuhe bwinshi bwa okiside, irwanya kwambara neza, ituze ryiza ryumuriro, coefficente ntoya yo kwagura ubushyuhe, ubushyuhe bwinshi bwumuriro, ubukana bwinshi, kurwanya ubushyuhe, kurwanya ruswa yangiza nibindi bintu byiza cyane.Yakoreshejwe cyane mu binyabiziga, imashini, kurengera ibidukikije, ikoranabuhanga mu kirere, amakuru ya elegitoroniki, ingufu n’izindi nzego, kandi yabaye ceramic yubatswe idasubirwaho ifite imikorere myiza mu nganda nyinshi.Noneho reka nkwereke!

Gucumura

Gucumura bidafite ingufu bifatwa nkuburyo butanga ikizere cyo gucumura SiC.Ukurikije uburyo butandukanye bwo gucumura, gucumura bidafite umuvuduko birashobora kugabanywamo ibice bikomeye.Binyuze muri ultra-nziza β- Umubare ukwiye wa B na C (ogisijeni iri munsi ya 2%) wongeyeho ifu ya SiC icyarimwe, na s.proehazka yashizwe mumubiri wa SiC yacumuye hamwe n'ubucucike buri hejuru ya 98% muri 2020 ℃.A. Mulla n'abandi.Al2O3 na Y2O3 byakoreshejwe nk'inyongeramusaruro kandi byacumishijwe kuri 1850-1950 ℃ kuri 0.5 μ m β- SiC (ubuso burimo ibice bike bya SiO2).Ubucucike bugereranije bwububiko bwa SiC bwabonetse burenze 95% yubucucike bwa theoretical, kandi ingano ni nto kandi nubunini buringaniye.Ni microni 1.5.

Gushyira ahagaragara

SiC irashobora gusa gucumurwa neza mubushyuhe bwo hejuru cyane nta kintu cyongeweho icyaha, kuburyo abantu benshi bashyira mubikorwa uburyo bwo gucumura bishyushye kuri SiC.Habayeho raporo nyinshi kuri sinteri ishyushye ya SiC wongeyeho infashanyo zo gucumura.Alliegro n'abandi.Yize ku ngaruka za boron, aluminium, nikel, fer, chromium nibindi byongeweho ibyuma kuri densification ya SiC.Ibisubizo byerekana ko aluminium na fer aribyo byongerwaho imbaraga kugirango biteze imbere SiC ishyushye.FFlange yize ku ngaruka zo kongeramo umubare utandukanye wa Al2O3 kumiterere ya SiC ishyushye.Bifatwa ko kwiyongera kwa SiC bishyushye bifitanye isano nuburyo bwo gusesa no kugwa.Ariko, uburyo bushyushye bwo gukanda burashobora kubyara ibice bya SiC gusa muburyo bworoshye.Ubwinshi bwibicuruzwa byakozwe nigihe kimwe gishyushye cyo gucumura imashini ni nto cyane, ntabwo bifasha umusaruro winganda.

Gushyushya isostatike ikanda

Kugirango tuneshe ibitagenda neza muburyo bwo gucumura gakondo, ubwoko bwa B na C bwakoreshejwe nk'inyongeramusaruro kandi hashyizweho tekinoroji ya isostatike ikanda.Kuri 1900 ° C, habonetse ububumbyi bwiza bwa kirisiti ifite ubucucike burenga 98, kandi imbaraga zo kugonda ubushyuhe bwicyumba zishobora kugera kuri MPa 600.Nubwo gususurutsa isostatike ishyushye bishobora kubyara ibicuruzwa byuzuye bifite imiterere igoye kandi ifite imashini nziza, gucumura bigomba gufungwa, bigoye kugera kumusaruro winganda.

Icyaha

Imyitwarire ya silicon karbide, izwi kandi kwizina rya silicon karbide yonyine, bivuga inzira aho bilet yifata hamwe na gaze cyangwa icyiciro cyamazi kugirango izamure ubwiza bwa bilet, igabanye ubukana, hamwe nibicuruzwa byarangiye bifite imbaraga nukuri neza.fata ifu ya α- SiC na grafite bivangwa mukigereranyo runaka hanyuma ushyushye kugeza kuri 1650 ℃ kugirango ube fagitire kare.Muri icyo gihe, yinjira cyangwa yinjira muri bilet ikoresheje gaze ya Si kandi igakora na grafite kugirango ikore β- SiC, ihujwe nuduce duto twa α- SiC.Iyo Si yinjiye rwose, reaction yahinduwe umubiri hamwe nubucucike bwuzuye hamwe nubunini butagabanuka burashobora kuboneka.Ugereranije nubundi buryo bwo gucumura, ingano yubunini bwa reaction ya sinter mugikorwa cya densification ni nto, kandi ibicuruzwa bifite ubunini nyabwo birashobora gutegurwa.Ariko, kubaho kwa SiC kwinshi mumubiri wacumuye bituma imiterere yubushyuhe bwo hejuru bwa reaction yahinduye ububumbyi bwa SiC.