Grafayithi waziva

I-graphite yaziva yahlulwe yarite-based graphite felt, polyacrylonitrile-based (PAN-based) graphite felt, and viscose-based graphite felt because of a different selection of original felts. Eyona njongo iphambili kufuneka isetyenziswe njengolondolozo lobushushu kunye nezinto zokubambisa ubushushu kwi-monocrystalline silicon smelting furnace. Kwimizi-mveliso yamachiza, inokusetyenziswa njengesixhobo sokucoca ulwelo lwe-reagents zamachiza ezonakalisayo.

Ikharbon yaziva igrafayithi yaziva emva kokuphathwa kubushushu obuphezulu obungaphezulu kwama-2000 ℃ phantsi komshini okanye emoyeni. Umxholo wekhabhoni uphezulu kunowecarbon aziva, ufikelela ngaphezulu kwama-99%. Ekupheleni kweminyaka yama-1960, i-graphite yaziva sele isele ikhona kwihlabathi. I-graphite yaziva yahlulwe yaya kususelwa kwi-pitch-based, i-polyacrylonitrile-based grafite yaziva kwaye i-viscose-based grafite yaziva ngenxa yokhetho olwahlukileyo lweemvakalelo zokuqala.

Phakathi kwabo, i-asphalt emelwe yiKureha Chemical yaseJapan yeyona nto iphambili kushishino lokugquma [2], i-Europe kunye ne-American insulation felts zenziwe ngezixhobo zokuncamathela, ngelixa uninzi lwase China lusebenzisa i-polyacrylonitrile njengezinto ezingafunekiyo. Inkqubo: Sika i-polyacrylonitrile esekwe kwikhabhoni evakalayo okanye i-viscose esekwe kwikhabhoni evayo kubungakanani obufunekayo, uyiqengqe ityhubhu kwaye uyibeke kwisitya esenziwe ngezinto zegraphite, kwaye ubeke isitya segraphite kwiziko lobushushu obuphezulu (phezulu -Isithando somlilo sisithando somsinga wegraphite, isantya esiphakathi, Isithando somlilo esine-frequency ephezulu okanye ezinye iifanitshala ezinobushushu ezineendlela zokufudumeza), ezikhuselwe ngumoya okanye i-inert ye-inert ephezulu, eshushu ukuya kwi-2200-2500 ° C kwinqanaba lokufudumeza ka-100-300 ° C / h, kwaye emva koko zipholile ngokwemvelo ukuya kwi-100 ° C.

I-graphite yaziva yomelele kwaye inokuxhathisa okunamandla kwe-oxidation, kodwa inobhetyebhetye obuhlwempuzekileyo, uxinano oluphezulu kakhulu kunye nokusebenza okulondolozwe kobushushu. Ukongeza kwiimpawu zokucoceka okuphezulu, ukumelana nobushushu obuphezulu, ukumelana nokubola, kunye nokunganyibiliki kwegrafite yebhlokhi, zikwanazo neenzuzo zokuba zi-elastic, ukusonga ngokungakhathali, ukusika kunye nokuthunga ngentambo yegraphite. Eyona njongo igrafite yaziva njengokugcina ubushushu kunye nezinto zokugquma ubushushu kwisinyibilikisi esinye sokunyibilikisa iziko. Kwimizi-mveliso yamachiza, inokusetyenziswa njengesixhobo sokucoca ulwelo lwe-reagents zamachiza ezonakalisayo. Igrafayithi ivakalelwa ukuba ingasetyenziswa kubushushu obumalunga ne-3000 ° C kwimo engeyiyo-oxidizing.