Av nplaum castables yog heev haum rau hauv ob sab phlu nyob rau hauv nruab nrab kub qhov chaw.
Ordinary av nplaum castables tsis txo qis hauv lub zog ntawm qhov nruab nrab qhov kub thiab txias, muaj kev tiv thaiv zoo, thiab yooj yim rau kev tsim. Ntxiv mus, thaum lub sij hawm cua sov txheej txheem ntawm no castable, lub zog ntawm 800 degree -1000 degree yuav dheev nce mus rau ntau tshaj 30MPa piv nrog rau 10MPa ntawm lwm yam high-qib castables. Tom qab qhov kub thiab txias nce, ntawm qhov tsis sib xws, qhov nce hauv lub zog tsis loj heev.
Cov khoom siv raw ntawm cov castable kuj txiav txim siab nws lub cev thiab tshuaj hloov pauv. Cov dej dawb ntawm cov castable yog maj mam tshem tawm ntawm qhov kub thiab txias, thiab cov dej khi tau sai sai ntawm 450 degree -600 degree . Cov tshuaj tiv thaiv kab mob endothermic loj tshwm sim hauv thaj av nruab nrab qhov kub thiab txias, thiab qhov kev siv zog hloov pauv hauv thaj av nruab nrab kub tsis loj.
Cov castable no yuav raug hloov qee theem ua ntej 800 degree, thiab lub zog compressive thiab ziab lub zog yuav nce tsawg dua tom qab hlawv. Thaum qhov kub nce ntawm 900 degree mus rau 1050 degree, dawb txhuas thiab hlau yuav decomposed. Nyob nruab nrab ntawm 1150 degree thiab 1300 degree, cov tsim mullite thiab nplej yuav loj hlob ntxiv, ua rau cov av nplaum castable ntom thiab khi. nce, lub zog kuj yuav nce.
Vim hais tias cov ntsiab lus impurity nyob rau hauv cov av nplaum yog siab tshaj qhov siab ntawm alumina bauxite, qhov kub ntawm sintering tshwm ua ntej, yog li nws tsuas yog kov yeej lub txaj muag ntawm castable nyob rau hauv nruab nrab kub cheeb tsam. Qhov no castable crystallizes zoo nyob rau hauv nruab nrab kub cheeb tsam. Lub sij hawm no, lub mullite siv lead ua theem yog koob zoo li, thiab nws yog interspersed nrog ib leeg nyob rau hauv lub sab hauv, tab sis nws muaj ib tug tej yam lub zog nyob rau hauv nruab nrab kub cheeb tsam.
Vim muaj av nplaum, nyob rau hauv qhov kev txiav txim ntawm dispersant thiab coagulant, lub zog ntawm cov av nplaum castable nyob rau hauv chav tsev kub thiab tsis kub yog los ntawm 800 degree mus rau lub kua theem. Raws li qhov kub thiab txias, cov kua theem nce, thiab tib lub sijhawm, vim yog cov acicular mullite tsim nyob rau hauv cov av nplaum castable, qhov nruab nrab kub lub zog ntawm cov av nplaum castable yog zoo dua, yog li cov av nplaum castable yog heev haum rau siv nyob rau hauv. qhov nruab nrab kub cheeb tsam.
