Kufotokozera kwapadera kwa Reaction Bonded SiC

Generalkufotokozera kwaKuyankhaSiC Yogwirizana

Reaction Bonded SiC ili ndi mphamvu zamakina komanso kukana okosijeni. Mtengo wake ndi wotsika. Masiku ano, yakopa chidwi cha anthu ambiri m'mafakitale osiyanasiyana.

SiC ndi mgwirizano wolimba kwambiri wa covalent. Pakupopera, kuchuluka kwa kufalikira kumakhala kochepa kwambiri. Nthawi yomweyo, pamwamba pa tinthu tating'onoting'ono nthawi zambiri pamakhala gawo lochepa la oxide lomwe limagwira ntchito ngati chotchinga chofalikira. SiC yoyera siipindika kwambiri popanda zowonjezera zopopera. Ngakhale njira yopopera kutentha ikagwiritsidwa ntchito, iyeneranso kusankha zowonjezera zoyenera. Pa kutentha kwambiri kokha, ndi pomwe zinthu zoyenera kuchulukira kwa uinjiniya pafupi ndi kuchuluka kwa chiphunzitso zimapezeka zomwe ziyenera kukhala pakati pa 1950 ℃ mpaka 2200 ℃. Nthawi yomweyo, mawonekedwe ndi kukula kwake zidzakhala zochepa. Ngakhale kuti SIC composites zitha kupezeka ndi nthunzi, zimangopangidwira kukonzekera zinthu zochepa kapena zopyapyala. Chifukwa cha nthawi yake yayitali chete, mtengo wopangira udzawonjezeka.

Reaction Bonded SiC idapangidwa mu 1950 ndi Popper. Mfundo yaikulu ndi iyi:

Pogwiritsa ntchito mphamvu ya capillary, silicon yamadzimadzi kapena silicon alloy yokhala ndi reactive activity imalowa mu zoumba zadothi zokhala ndi carbon ndipo carbon silicon imapangidwa mu reaction. Silicon carbide yatsopanoyo imalumikizidwa ndi tinthu ta silicon carbide toyambirira in situ, ndipo ma pores otsala mu filler amadzazidwa ndi mankhwala oikamo kuti amalize njira yolemetsa.

Poyerekeza ndi njira zina za silicon carbide ceramics, njira yoyeretsera ili ndi makhalidwe awa:

Kutentha kochepa kwa kukonza, nthawi yochepa yokonza, palibe chifukwa cha zida zapadera kapena zodula;

Zolumikizana zomwe sizimachepa kapena kusintha kwa kukula;

Njira zosiyanasiyana zopangira utomoni (kutulutsa, kulowetsa, kukanikiza ndi kuthira).

Pali njira zambiri zopangira mawonekedwe. Panthawi yopaka utoto, zinthu zazikulu komanso zovuta zimatha kupangidwa popanda kukakamizidwa. Ukadaulo wa Reaction Bonded wa silicon carbide wakhala ukuphunziridwa kwa zaka makumi asanu. Ukadaulo uwu wakhala umodzi mwamafakitale osiyanasiyana chifukwa cha zabwino zake zapadera.