Mene ne index zafin jiki na yumbu tubalin

A refractoriness na yumbu tubalin ne m zuwa na silica tubalin, har zuwa 1690 ~ 1730 ℃, amma softening zafin jiki a karkashin kaya ne fiye da 200 ℃ m fiye da na silica tubalin. Baya ga lu’ulu’u masu girman gaske na mullite, tubalin yumbu kuma sun ƙunshi kusan rabin lokacin gilashin amorphous mai ƙarancin narkewa.

Domin bulo na yumbu yana da ƙarancin zafin jiki mai laushi kuma yana raguwa a yanayin zafi mai zafi, ƙarfin wutar lantarki ya kai kashi 15% zuwa 20% ƙasa da na tubalin silica, ƙarfin injinsa kuma ya fi na tubalin silica muni. Sabili da haka, ana iya amfani da tubalin yumbu kawai a cikin sassan biyu na murhun coke. Kamar bangon rufewa mai sabuntawa, ƙaramin bulo mai rufin hayaƙi da bulo mai sabunta bulo, bulo mai rufin makera, rufin tanderu da bulo mai rufi, da sauransu.