Kufotokozera zambiri za Reaction Bonded SiC

Generalkufotokoza kwaZomwe anachitaZogwirizana ndi SiC

Reaction Bonded SiC ili ndi zida zamakina komanso kukana kwa okosijeni. Mtengo wake ndi wotsika. M’chitaganya chamakono, chakopa chidwi chowonjezereka m’mafakitale osiyanasiyana.

SiC ndi mgwirizano wamphamvu kwambiri. Mu sintering, kuchuluka kwa kufalikira kumakhala kochepa kwambiri. Nthawi yomweyo, pamwamba pa tinthu tating'onoting'ono timakhala ndi gawo locheperako la oxide lomwe limagwira ntchito yotchinga. Pure SiC sintered ndi yaying'ono popanda sintering zowonjezera. Ngakhale njira yopopera yotentha ikagwiritsidwa ntchito, iyeneranso kusankha zowonjezera zoyenera. Pokhapokha pa kutentha kwambiri, zingatheke zipangizo zoyenera zopangira uinjiniya pafupi ndi kachulukidwe kazinthu zomwe ziyenera kukhala kuyambira 1950 ℃ mpaka 2200 ℃. Nthawi yomweyo, mawonekedwe ake ndi kukula kwake kudzakhala kochepa. Ngakhale ma composites a SIC amatha kupezeka poyika nthunzi, amangokhala pokonzekera zocheperako kapena zocheperako. Chifukwa cha nthawi yayitali yabata, mtengo wopangira udzakwera.

Reaction Bonded SiC idapangidwa mu 1950s ndi Popper. Mfundo yofunikira ndi:

Pansi pa mphamvu ya capillary, silicon yamadzimadzi kapena aloyi ya silicon yokhala ndi zochitika zotakataka idalowa muzitsulo zadothi zomwe zimakhala ndi kaboni ndikupanga silicon ya carbon pochita. Silicon carbide yomwe yangopangidwa kumene imamangirizidwa ku tinthu tambiri ta silicon carbide mu situ, ndipo ma pores otsalira mu filler amadzazidwa ndi inpregnating agent kuti amalize kupanga densification.

Poyerekeza ndi njira zina za silicon carbide ceramics, sintering process ili ndi izi:

Low processing kutentha, yochepa processing nthawi, palibe chifukwa chapadera kapena mtengo zida;

Rection Zomangika mbali popanda shrinkage kapena kusintha kukula;

Njira zosiyanasiyana zomangira (extrusion, jekeseni, kukanikiza ndi kuthira).

Pali njira zambiri zopangira mawonekedwe. Pa sintering, kukula kwakukulu ndi zinthu zovuta zimatha kupangidwa popanda kukakamiza. Tekinoloje ya Reaction Bonded ya silicon carbide yaphunziridwa kwa theka la zaka. Tekinoloje iyi yakhala imodzi mwamafakitale osiyanasiyana chifukwa cha zabwino zake zapadera.