Reaction-sintered silicon carbide ili ndi mawonekedwe abwino

Chifukwa cha mawonekedwe ake abwino, reaction-sintered silicon carbide yakhala ikugwiritsidwa ntchito kwambiri ngati mankhwala opangira mankhwala. Kuchuluka kwake kwa ntchito kuli ndi mbali zitatu: kupanga ma abrasives; Amagwiritsidwa ntchito popanga zida zotenthetsera kukana - ndodo ya silicon molybdenum, chubu la silicon carbon, etc.; Pakuti kupanga mankhwala refractory. Monga chuma chapadera chotsutsa, chimagwiritsidwa ntchito muzitsulo ndi zitsulo zosungunula ngati ng'anjo yachitsulo, ng'anjo yachitsulo, kapu ndi zina zowonongeka, zowonongeka, zowonongeka kwa malo amphamvu a zinthu zoyaka moto; Muzitsulo zosowa (zinki, aluminiyamu, mkuwa) zosungunulira zosungunula ng'anjo, chitoliro chonyamulira chachitsulo, chipangizo chosefera, mphika wothirira, ndi zina zotero; Ndipo luso danga ngati kupondaponda injini mchira nozzle, mosalekeza mkulu kutentha gasi chopangira magetsi tsamba; Mu makampani silicate, ambiri monga zosiyanasiyana mafakitale ng'anjo okhetsedwa, bokosi mtundu kukana ng'anjo mlandu, saggar; M'makampani opanga mankhwala, amagwiritsidwa ntchito ngati m'badwo wa gasi, carburetor yamafuta osakanizidwa, ng'anjo yamoto wamoto desulfurization ndi zina zotero.

Kugwiritsa ntchito koyera kwa zinthu zopangidwa ndi α-SiC, chifukwa cha mphamvu zake zazikulu, zimakhala zovuta kuzipera mu ufa wa nanoscale ultrafined, ndipo tinthu tating'onoting'ono ndi mbale kapena ulusi, womwe umagwiritsidwa ntchito pogaya mu compact, ngakhale pakuwotcha mpaka kuwonongeka kwake. kutentha mozungulira, sangapange kupindika zoonekeratu, sangathe sintered, kachulukidwe mlingo wa mankhwala ndi otsika, ndi kukana makutidwe ndi okosijeni ndi osauka. Choncho, popanga mafakitale opanga zinthu, kachigawo kakang'ono ka β-SiC ultrafine powder amawonjezeredwa ku α-SiC ndikusankha zowonjezera kuti apeze mankhwala apamwamba kwambiri. Monga zowonjezera kwa mankhwala kugwirizana, malinga ndi mtundu akhoza kugawidwa mu oxides zitsulo, nayitrogeni mankhwala, mkulu chiyero graphite, monga dongo, zotayidwa okusayidi, zircon, zirconium corundum, laimu ufa, laminated galasi, silicon nitride, pakachitsulo oxynitride, mkulu chiyero cha graphite ndi zina zotero. The amadzimadzi njira ya kupanga zomatira akhoza kukhala mmodzi kapena angapo a hydroxymethylcellulose, akiliriki emulsion, lignocellulose, tapioca wowuma, zotayidwa okusayidi colloidal njira, pakachitsulo woipa colloidal njira, etc. Malinga ndi mtundu wa zowonjezera ndi kusiyana kwa kuchuluka kwa kuwonjezera, kutentha kwa kuwombera kwa compact sikufanana, ndipo kutentha kwa 1400 ~ 2300 ℃. Mwachitsanzo, α-SiC70% ndi tinthu kukula kugawa oposa 44μm, β-SiC20% ndi tinthu kukula kugawa zosakwana 10μm, dongo 10%, kuphatikiza 4.5% lignocellulosic njira 8%, wogawana wosanganiza, anapanga ndi 50MPa ntchito. kuthamanga, kuthamangitsidwa mumlengalenga pa 1400 ℃ kwa 4h, Kachulukidwe kowoneka bwino kwa mankhwalawa ndi 2.53g/cm3, porosity yowoneka ndi 12.3%, ndipo mphamvu yokhazikika ndi 30-33mpa. Ma sintering amitundu ingapo yazinthu zokhala ndi zowonjezera zosiyanasiyana alembedwa mu Table 2.

Nthawi zambiri, ma reaction-sintered silicon carbide refractories amakhala ndi zinthu zapamwamba kwambiri m'mbali zonse, monga mphamvu yamphamvu yopondereza, kukana kugwedezeka kwamphamvu kwamafuta, kukana kuvala bwino, kukhathamiritsa kwamphamvu kwamafuta komanso kukana kwa dzimbiri pa kutentha kwakukulu. Komabe, ziyenera kuwonedwanso kuti choyipa chake ndikuti antioxidant zotsatira zake ndizosauka, zomwe zimapangitsa kuti voliyumu ichuluke komanso kupindika m'malo otentha kwambiri kuti achepetse moyo wautumiki. Pofuna kuwonetsetsa kukana kwa okosijeni kwa reaction-sintered silicon carbide refractories, ntchito zambiri zosankhidwa zachitika pagawo lomangira. Kuphatikizika kwa dongo (lokhala ndi zitsulo zazitsulo) kuphatikizika, koma sikunapereke chitetezo, tinthu ta silicon carbide timakhalabe ndi makutidwe ndi okosijeni ndi dzimbiri.