Low-lithium-matrix heat resisting ceramic materials

Abstract

The invention relates to the field of a ceramic material, in particular to a low-lithium heat resisting ceramic material. The ceramic blank primarily contains the chemical compositions of SiO2, Al2O3, Fe2O3, Ti2O, CaO, MgO, K2O, Na2O and Li2O. The low-lithium heat resisting ceramic material is characterized in that SiO2 accounts for 50 to 65 percent by mass; Al2O3 accounts for 22 to 32 percent by mass; Fe2O3 accounts for 0.80 to 1.2 percent; Ti2O accounts for 0.05 to 0.15 percent; CaO accounts for 1.60 to 2.50 percent; MgO accounts for 0.60 to 1.2 percent; K2O accounts for 0.40 to 0.80 percent; Na2O accounts for 0.15 to 0.05 percent; and Li2O accounts for 1.20 to 2.20 percent; and other components account for 0.20 to 0.60 percent in the balancing amount, and the loss on ignition accounts for 7.00 to 10.00 percent. The dosage of spodumene in the ceramic blank is reduced to 20 to 30 percent; Li2O accounts for just 1.20 to 2.20 percent; the heat resistance can be improved to the extent that the low-lithium heat resisting ceramic material does not crack when cooled quickly after the ceramic material is burnt in dry state at the temperature of 420 to 440 DEG C. Accordingly, the raw material cost is reduced; and the heat resistance is improved.

Description

technical field [0001] The invention relates to the field of ceramic materials, in particular to a low-lithium heat-resistant ceramic material. Background technique [0002] At present, the main raw material used in domestically produced heat-resistant porcelain is spodumene imported from Australia. The amount of spodumene in the formula of heat-resistant ceramic blanks is as high as 35% to 50%. 2 O accounts for more than 2.4%. Due to the high price and unstable supply of spodumene, the price of spodumene-based heat-resistant ceramic blanks composed of high-quality kaolin and quartz raw materials is also as high as 1,800 to 2,500 yuan / ton. Moreover, the heat resistance can only reach 380-400°C for dry burning without cracking. Therefore, it is particularly necessary to design a new combination of ceramic blanks, especially to reduce the proportion of spodumene in ceramic blanks, and reduce the dosage to 20%-30%. %, heat resistance is improved to dry burning 420 ~ 440 ℃ rapi...

AI Technical Summary

Problems solved by technology

[0002] At present, the main raw material used in domestically produced heat-resistant porcelain is spodumene imported from Australia. The amount of spodumene in the formula of heat-resistant ceramic blanks is as high as 35% to 50%. 2 O accounts for more than 2.4%. Due to the high price and unstable supply of spodumene, the price of spodumene-based heat-resistant ceramic blanks composed of high-quality kaolin and quartz materials is also as high as 1,800 to 2,500 yuan / ton