Preparation and characterization of alkaline resistant porous ceramics from potassium titanate whiskers

Abstract

Abstract: The preparation and characterization of alkaline resistant porous ceramics from potassium titanate whiskers are studied. K2Ti4O9 whiskers in the whisker preforms (mixtures of K2Ti6O13 and K2Ti4O9) were completely converted to K2Ti6O13 at 960℃. The alkaline resistance as well as the change in bending strength, porosity and permeability of the ceramics was investigated by altering the composition of the preforms in which the content of K2Ti6O13 whiskers was higher than 50% (molar fraction). The alkaline resistance of the porous K2Ti6O13 ceramics is found much higher than that of Al2O3 in caustic NaOH solutions, and further study indicates that the K2Ti6O13 ceramics can be stably used in solutions of pH＞2.0. The bending strength increases initially with the content of the raw K2Ti6O13 in the preforms up to 66% (molar fraction) and then decreases, contrary to the behaviors of porosity and permeability. The values of bending strength, porosity and permeability of the ceramics prepared from the preform of 80% (molar fraction) raw K2Ti6O13 whiskers are respectively 56MPa, 29.4% and 330L•m－2•h－1, which are comparable to those of the porous Al2O3 ceramics.

Key words: ceramics, alkaline resistance, sintering, potassium titanate

摘要： The preparation and characterization of alkaline resistant porous ceramics from potassium titanate whiskers are studied. K2Ti4O9 whiskers in the whisker preforms (mixtures of K2Ti6O13 and K2Ti4O9) were completely converted to K2Ti6O13 at 960℃. The alkaline resistance as well as the change in bending strength, porosity and permeability of the ceramics was investigated by altering the composition of the preforms in which the content of K2Ti6O13 whiskers was higher than 50% (molar fraction). The alkaline resistance of the porous K2Ti6O13 ceramics is found much higher than that of Al2O3 in caustic NaOH solutions, and further study indicates that the K2Ti6O13 ceramics can be stably used in solutions of pH＞2.0. The bending strength increases initially with the content of the raw K2Ti6O13 in the preforms up to 66% (molar fraction) and then decreases, contrary to the behaviors of porosity and permeability. The values of bending strength, porosity and permeability of the ceramics prepared from the preform of 80% (molar fraction) raw K2Ti6O13 whiskers are respectively 56MPa, 29.4% and 330L•m－2•h－1, which are comparable to those of the porous Al2O3 ceramics.

关键词: ceramics;alkaline resistance;sintering;potassium titanate

ZHOU Yaxin, LIU Chang, HE Ming, YANG Zhuhong, FENG Xin, LU Xiaohua. Preparation and characterization of alkaline resistant porous ceramics from potassium titanate whiskers[J]. , DOI: .

周亚新, 刘畅, 何明, 杨祝红, 冯新, 陆小华. 钛酸钾晶须耐碱多孔陶瓷的制备及表征[J]. , DOI: .

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