Kabide ya silicon yopangidwa ndi reaction-sintered ili ndi makhalidwe abwino akuthupi

Chifukwa cha makhalidwe ake abwino akuthupi, silicon carbide yopangidwa ndi reaction-sintered yagwiritsidwa ntchito kwambiri ngati zinthu zazikulu zopangira mankhwala. Ntchito yake ili ndi magawo atatu: kupanga zinthu zopopera; Amagwiritsidwa ntchito popanga zinthu zotenthetsera zokana — ndodo ya silicon molybdenum, chubu cha kaboni cha silicon, ndi zina zotero; Pakupanga zinthu zokana. Monga chinthu chapadera chokana, chimagwiritsidwa ntchito popanga chitsulo ndi chitsulo ngati ng'anjo yachitsulo, cupola ndi zina zopopera, dzimbiri, kuwonongeka kwa malo olimba a zinthu zosapsa moto; Mu zopopera zachitsulo (zinc, aluminiyamu, mkuwa) zopopera ng'anjo, chitoliro chotumizira chitsulo chosungunuka, chipangizo chosefera, mphika wotsekera, ndi zina zotero; Ndi ukadaulo wamlengalenga ngati nozzle ya mchira wa injini yopopera, tsamba la turbine la mpweya wachilengedwe wopitilira kutentha kwambiri; Mumakampani opanga silicate, pali mitundu yosiyanasiyana ya shed ya uvuni wa mafakitale, chopopera ng'anjo yokana bokosi, chopopera; Mumakampani opanga mankhwala, chimagwiritsidwa ntchito popanga gasi, carburetor yamafuta osaphika, ng'anjo yochotsera mpweya wa flue ndi zina zotero.

Kugwiritsa ntchito bwino zinthu zopangira α-SiC, chifukwa cha mphamvu zake zazikulu, zimakhala zovuta kuzipera kukhala ufa wosalala kwambiri, ndipo tinthu tating'onoting'ono ndi mbale kapena ulusi, zomwe zimagwiritsidwa ntchito kupukuta mu compact, ngakhale kutentha kwake kozungulira, sizipanga kupindika koonekeratu, sizingasunthidwe, kuchuluka kwa zinthu kumakhala kochepa, ndipo kukana kwa okosijeni kumakhala kofooka. Chifukwa chake, popanga zinthu zamafakitale, ufa wochepa wa particles β-SiC ultrafine umawonjezeredwa ku α-SiC ndikusankha zowonjezera kuti mupeze zinthu zolemera kwambiri. Monga chowonjezera cholumikizira zinthu, malinga ndi mtundu wake, zitha kugawidwa m'ma oxide achitsulo, mankhwala a nayitrogeni, graphite yoyera kwambiri, monga dongo, aluminium oxide, zircon, zirconium corundum, ufa wa laimu, galasi la laminated, silicon nitride, silicon oxynitride, graphite yoyera kwambiri ndi zina zotero. Madzi a guluu wopangira akhoza kukhala hydroxymethylcellulose, acrylic emulsion, lignocellulose, tapioca starch, aluminiyamu oxide colloidal solution, silicon dioxide colloidal solution, ndi zina zotero. Malinga ndi mtundu wa zowonjezera ndi kusiyana kwa kuchuluka kwa zowonjezera, kutentha kwa kuwombera kwa compact sikofanana, ndipo kutentha kwake ndi 1400 ~ 2300℃. Mwachitsanzo, α-SiC70% yokhala ndi kukula kwa tinthu toposa 44μm, β-SiC20% yokhala ndi kukula kwa tinthu tosakwana 10μm, dongo 10%, kuphatikiza 4.5% yankho la lignocellulosic 8%, losakanizidwa mofanana, lopangidwa ndi kuthamanga kwa 50MPa, loyatsidwa mumlengalenga pa 1400℃ kwa maola 4, Kuchuluka kwa chinthucho ndi 2.53g/cm3, porosity yowonekera ndi 12.3%, ndipo mphamvu yokoka ndi 30-33mpa. Katundu wothira wa mitundu yosiyanasiyana ya zinthu zokhala ndi zowonjezera zosiyanasiyana zalembedwa mu Table 2.

Kawirikawiri, zotsukira za silicon carbide zopangidwa ndi reaction-sintered zili ndi makhalidwe abwino kwambiri m'mbali zonse, monga mphamvu yamphamvu yokakamiza, kukana kutentha kwambiri, kukana kuvala bwino, kusinthasintha kwa kutentha komanso kukana dzimbiri kwa solvent pa kutentha kwakukulu. Komabe, ziyeneranso kuoneka kuti vuto lake ndilakuti mphamvu ya antioxidant ndi yoipa, zomwe zimapangitsa kuti voliyumu ikule komanso kusinthika m'malo otentha kwambiri kuti achepetse moyo wa ntchito. Pofuna kuonetsetsa kuti zotsukira za silicon carbide zopangidwa ndi reaction-sintered zimakana, ntchito yambiri yosankha yachitika pa bonding layer. Kugwiritsa ntchito dongo (lokhala ndi zitsulo oxides) fusion, koma sikunapereke zotsatira za buffer, tinthu ta silicon carbide timakhalabe ndi mpweya woipa komanso dzimbiri.