Silica zvidhinha

Silica chidhinha chidhinha chakadzvanywa chakaumbwa nemullite (3Al2O3.2SiO2) uye silicon carbide (SiC) semaminerari makuru. Hunhu hwayo haingori chete yekupisa tembiricha kusagadzikana kwemammite, asi zvakare kusakara kusagadzikana, ngura kuramba, uye yakanaka yekupisa conductivity yesilicon carbide. Apo Baosteel yakavakwa muma1980, izvo zvigadzirwa zvekufungidzira zvakaunzwa kubva kuNippon Simbi, iyo yaitaridzika sematangi e torpedo, yaive yakafanana nezvazvino zvidhinha zvesilicon-yakaumbwa. Muchokwadi, icho chakashandurwa zvinhu zvealuminium silicate zvigadzirwa. Izvo zvekutanga zvinhu zvesimbi ladle ndeyezvibodzwa zvezvidhina zvinonyanya kugadzirwa neakakwira aluminium. Mukufambira mberi kwetekinoroji yeindasitiri yesimbi neyesimbi, kuitira kuti ikurumidze kumhanyisa simbi, imwe huwandu hweCalcium oxide (CaO) inoenda kunonzi prereatment. Nenzira iyi, zvinhu zvinokanganisa zviri mutangi zvinofanirwa kumira ngura yekupisa-simbi yesimbi yakanyunguduka uye kuramba kurwisa kwakasimba kwealkaline. Zviripachena, iyo yepamusoro-aruminiyamu zvinhu haigone kumira nayo, saka kuwedzera yakaenzana huwandu hwesilicon carbide kune iyo yakakwirira-aluminium zvinhu inoumba mutsva mutsva. Iyo metallurgia indasitiri inoidaidza kuti yakadzvanywa chidhinha chealuminium silicate yakasanganiswa nesilicon carbide.

Iko kuita kwesilicon carbide zvidhinha kunouya kubva mukuita kwayo. Kutanga, zvakafanira kusarudza yakasarudzika giredhi alumina neAl2O3 yakakwira kupfuura 80% mune yakatsvuka zvinhu. Iyo silicon carbide inofanirwa kuve yakachena uye iyo Mohs kuoma kunodiwa kuri padyo ne9.5. Sarudzo yekambani yesilicon carbide yakaoma kwazvo. Rudzi urwu rwemaminerari rwakanyanya kushomeka. Mazhinji ezvigadzirwa anoshandisa SiO2 neC kuti synthesize SiC patembiricha yepamusoro muvira remagetsi. Zvinhu zvakasiyana mbishi zvinogadzira mhando misiyano. Parizvino, mukugadzirwa kweSiC, iyo SiO2 mune yakasvibirira zvinhu zvinobva kune yakasikwa silika, uye C inotorwa kubva kumarasha coke uye marasha. Petrolium coke, zvinoenderana nezvatakatsvaga, silicon carbide inogadzirwa nepetroleum coke uye SiO2 ine zviratidziro zvakakwirira maererano nekuoma uye kupfeka kuramba, uye inokodzera kushandiswa seasilicon carbide zvidhinha. Iwo makristasi makuru epasi ezvidhinha zvakapiswa zvakagadzirwa kubva kune izvi zvigadzirwa mbichana mullite, silicon carbide uye corundum. Aya macherwa ane kuomarara kwakanyanya, kunoisa hwaro hweyakagwinya uye yakasimba-simba zvigadzirwa zvinodzora.