氧化钪对钾长石结晶釉组织结构和性能的影响

Effect of Scandium Oxide on Structure and Properties of Potassium Feldspar Crystalline Glaze

以钾长石为主晶相的釉料对解决四方相氧化锆陶瓷粘接强度不足且脆性大的问题具有良好的应用前景。本文通过DSC、XRD、SEM、硬度、强度、折射率、可见光透过率、热膨胀系数等测试,研究了Sc_(2)O_(3)含量对钾长石结晶釉结构及性能的影响。结果表明,当Sc_(2)O_(3)含量从0%(质量分数,下同)增加至10%,结晶釉的析晶温度从958.5℃降低至827.8℃,析晶能力增强,烧结后的结晶釉晶粒尺寸不断增大。随着Sc_(2)O_(3)含量的增加,结晶釉中伴随析出硅酸钪晶体,结晶釉的结晶度、努氏硬度、抗弯强度和折射率均在Sc_(2)O_(3)含量为6.67%时达到最佳,可见光透过率先减小后增大,热膨胀系数减小。

Glazes composed of potassium feldspar as main crystals hold promising potential for addressing the issues of insufficient bonding strength and high brittleness in tetragonal zirconia ceramics.The effect of scandium oxide content on structure and characteristics of potassium feldspar crystalline glazes was studied by DSC,XRD,SEM,hardness,strength,refractive index,visible light transmittance and thermal expansion tests.The results indicate that as Sc_(2)O_(3) content increases from 0%(mass fraction,the same below)to 10%,the crystallization temperature of crystalline glaze decreases from 958.5℃ to 827.8℃,accompanied by an increase in crystallization capacity.Furthermore,the grain size of sintered crystalline glaze steadily enlarges.With the increase of Sc_(2)O_(3) content,scandium silicate crystals precipitate within the crystalline glaze.The crystallinity,knoop hardness,bending strength and refractive index of crystalline glaze reach their optimal values at Sc_(2)O_(3) content of 6.67%.The visible light transmittance decrease first and then increase,while the thermal expansion coefficient decreases.