Lo lus "refractory" txhais tau tias yog ib pawg ntawm cov ntaub ntawv, uas tuaj yeem tiv taus qhov kub thiab txias. Feem ntau, cov khoom tsis yog xim hlau uas raug rau ib puag ncig saum toj 1.000 F yog suav tias yog refractory. Cov ntaub ntawv refractory muaj ntau yam kev siv, los ntawm foob pob hluav taws tso platforms mus rau cov khoom siv hluav taws xob. Txawm li cas los xij, kev lag luam steel yog cov neeg siv khoom loj tshaj plaws thiab siv ze li ntawm 70 feem pua ntawm tag nrho cov khoom siv refractory tsim txhua xyoo. Cov khoom siv refractory yuav tsum ruaj khov ntawm lub cev thiab tshuaj txhua lub sijhawm, tshwj xeeb tshaj yog thaum raug kub siab. Muaj peev xwm tiv thaiv thermal shocks, efficiency ntawm thermal expansion, thiab nyob twj ywm chemically inert txhua lub sij hawm yog lub feem ntau txhais cov yam ntxwv ntawm refractory ntaub ntawv.
Kev faib tawm ntawm cov khoom siv hluav taws xob
Kev faib tawm ntawm cov ntaub ntawv refractory yog nyob ntawm lawv cov tshuaj muaj pes tsawg leeg. Muaj peb pawg tseem ceeb raws li kev faib tawm no:
ACIDIC REFRACTORIES: Lawv feem ntau yog ua los ntawm alumina thiab silica. Acid refractories tsis cuam tshuam los ntawm cov kua qaub, tab sis cov ntaub ntawv yooj yim tuaj yeem cuam tshuam lawv yooj yim. Hluav taws kub yog cov piv txwv feem ntau nyob rau hauv pawg no.
BASIC REFRACTORIES: Lawv feem ntau yog ua los ntawm magnesia. Basic refractories tsis cuam tshuam los ntawm cov hauv paus, tab sis cov ntaub ntawv acidic tuaj yeem cuam tshuam lawv yooj yim. Lawv feem ntau yog siv los ua cov khoom siv hauv ob sab phlu hauv industrial furnaces.
NEUTRAL REFRACTORIES: Lawv feem ntau yog ua los ntawm chromium. Neutral refractories tsis cuam tshuam los ntawm acids lossis cov hauv paus. Chromium carbon yog cov piv txwv feem ntau ntawm pawg no.
Kev sib xyaw ntawm cov khoom siv Refractory
Nws kuj tseem tuaj yeem txheeb xyuas cov ntaub ntawv refractory los ntawm lawv txoj kev tsim khoom thiab cov duab. Lwm cov txheej txheem categorization feem ntau yog nyob ntawm fusion kub. Piv txwv li, Zirconia tuaj yeem sawv tawm tsam 2.000 C yooj yim. Ntawm qhov tod tes, hluav taws cib (refractory cib) tsuas tuaj yeem tiv taus mus txog 1.580 C. Cov ntaub ntawv refractory muaj cov qauv sib txawv raws li lawv siv, tab sis raws li peb tau hais los saum no, nyob ruaj khov nyob rau hauv qhov kub thiab txias yog ib qho zoo rau txhua tus ntawm lawv.
