Kev tua hluav taws ntawm cov ntaub ntawv refractory yog ib qho txheej txheem kub kub heev. Nyob rau hauv cov txheej txheem no, ib tug series ntawm lub cev thiab tshuaj hloov pauv tshwm sim nyob rau hauv lub batch, xws li decomposition, lub cev qhuav dej, theem hloov, melting, solid-phase cov tshuaj tiv thaiv thiab sintering, uas yuav roughly faib mus rau hauv lub nram qab no theem:
1. Dej tawm theem ntawm lub cev ntsuab. 10 degree - 200 degree, feem ntau tso tawm cov dej dawb seem thiab cov dej adsorbed hauv lub cib dawb
2. Decomposition thiab oxidation theem. 200 degree - 1000 degree , tso tawm cov tshuaj chemically khi dej thiab lub cev thiab tshuaj hloov pauv, decomposition ntawm cov tebchaw, oxidation thiab combustion ntawm cov organic teeb meem, thiab siv lead ua transformation los yog tsim ib tug me me npaum li cas ntawm cov kua theem. Lub sijhawm no, qhov zoo ntawm cov cib txo qis, qhov porosity nce, thiab lub zog hloov pauv
3. Ua kua theem tsim thiab theem tshiab tsim theem. Tshaj 1000 degree, qhov decomposition ntawm theem no txuas ntxiv mus. Nrog rau qhov kub thiab txias, tus nqi ntawm cov kua theem nce thiab qee qhov tshiab ntxhia theem pib tsim
4. Sintering theem. Lub sintering kub ntawm lub cib feem ntau yog 0.3-0.9 lub sij hawm ntawm melting kub ntawm cov khoom. Lub cev ntsuab shrinks nrog rau ncua sij hawm thiab qhov kub thiab txias los tsim ntom polycrystalline, thiab lub zog thiab hardness nce. Tom qab lub sintering, lub cev ntsuab tsim ib tug tej yam mineral theem microstructure, uas ua rau cov khoom refractory muaj tej yam khoom.
5. Cua txias theem. Thaum lub sij hawm no, lub crystallization ntawm refractory theem, transformation ntawm ib co siv lead ua cov ntaub ntawv, lub solidification ntawm iav theem, thiab lwm yam tshwm sim, thiab lub zog, ceev thiab ntim ntawm cib muaj kev hloov pauv.
