硅灰石对LAS系微晶釉料性能的影响  

EFFECTS OF WOLLASTONITE ON PROPERTIES OF LITHIUM ALUMINOSILICATE CRYSTALLITE GLAZE

作　　者：张晓丽[1,2] 李勇[2,3] 

机构地区：[1]山东理工大学材料学院,山东淄博255049 [2]山东工业陶瓷研究设计院,山东淄博255031 [3]武汉理工大学,武汉430070

出　　处：《硅酸盐学报》2010年第6期1093-1097,共5页Journal of The Chinese Ceramic Society

摘　　要：采用溶胶–凝胶法制备不同硅灰石含量的锂铝硅(Li2O–Al2O3–SiO2,lithium aluminosilicate,LAS)系微晶釉料,并测试分析所得样品的显微结构、体积密度、抗弯强度和热膨胀系数。研究表明:适量的硅灰石可以降低LAS微晶釉料的烧结温度,扩大熔化温度范围,降低釉料黏度,进而促进釉料中晶体的发育;并且随着硅灰石的加入,在硅灰石质量分数为5%左右时,LAS系微晶釉料的抗弯强度出现极大值。硅灰石的加入可以影响β-锂霞石向β-锂辉石的转变,使微晶釉料的热膨胀系数随之变化,但这种转变量并不是线性变化,而是有一极小值;因此可以找到一个合适的硅灰石掺量,制备既具有合适的热膨胀系数,又具有理想的其他物理性能的陶瓷材料。Lithium aluminosilicate （LAS） crystallite glaze with different wollastonite contents were prepared by the sol–gel process. The microstructure,bulk density,bending strength,and thermal expansion of samples were tested and analyzed. The results show that LAS crystallite glaze with an appropriate amount （in mass,the same below） of wollastonite has a lower sintering-temperature and larger crystal temperature range than LAS crystallite glaze without wollastonite. Since viscosity of crystallite glaze is reduced by adding the wollastonite,the crystallization of the crystallite glaze can be boosted. The bending strength of the LAS crystallite glaze reaches the maximum with 5% wolllastonite. The analysis results also indicate that the wollastonite can affect the transformation be-tween β-spodumene and β-eucryptite,resulting in the increase of thermal expansion of the crystallite glaze. However,this change is not linear and has a minimum,and thus an appropriate doping amount of wolllastonite is found to obtain an ideal material with ap-propriate thermal expansion and other properties.

关 键 词：硅灰石 锂铝硅系微晶釉料 烧结温度 抗弯强度 热膨胀系数 

分 类 号：TQ174.1[化学工程—陶瓷工业]