Gabatarwa na asali na tubalin yumbu mai jujjuyawa

Tulin yumbu yana nufin samfuran yumbu tare da abun ciki na Al2O3 na 30% -40% kayan siliki na aluminum. Ana yin tubalin yumbu da yumbu mai laushi 50% da 50% yumbu mai yumɓu, waɗanda aka daidaita bisa ga wasu buƙatun girman ƙwayar. Bayan gyare-gyare da bushewa, ana kora su a babban zafin jiki na 1300 ~ 1400 ℃. Ma’adinai abun da ke ciki na yumbu tubalin ne yafi kaolinite (Al2O3 · 2SiO2 · 2H2O) da kuma 6% ~ 7% impurities (oxides na potassium, sodium, calcium, titanium, da baƙin ƙarfe). Tsarin harbe-harbe na tubalin yumbu shine galibi tsarin ci gaba da bushewa da bazuwar kaolin don samar da lu’ulu’u na mullite (3Al2O3 · 2SiO2). SiO2 da Al2O3 a cikin bulo na yumbu suna samar da silicate mai ƙarancin narkewa tare da ƙazanta yayin aiwatar da harbe-harbe, wanda ke kewaye da lu’ulu’u masu yawa.

Tubalin yumbu sune samfuran refractory acid mai rauni, waɗanda zasu iya tsayayya da yashwar acidic slag da gas acid, kuma suna da ɗan ƙaramin juriya ga abubuwan alkaline. Tubalin yumbu suna da kyawawan kaddarorin thermal kuma suna da juriya ga saurin sanyi da saurin zafi.