TiO_(2)对Dy_(2)O_(3)-Al_(2)O_(3)-SiO_(2)微晶玻璃晶化行为的影响  

Effect of TiO_(2) on crystallization behavior of Dy_(2)O_(3)-Al_(2)O_(3)-SiO_(2) glasses

作　　者：朱巍巍[1] 郭盛名 唐木 邹豪豪 冉旭[1] ZHU Weiwei;GUO Shengming;TANG Mu;ZOU Haohao;Ran Xu(School of Materials Science&Engineering,Changchun University of Technology,Changchun 130102,China)

机构地区：[1]长春工业大学材料科学与工程学院,吉林长春130102

出　　处：《长春工业大学学报》2023年第2期97-105,F0003,共10页Journal of Changchun University of Technology

基　　金：国家自然科学基金(51805046)。

摘　　要：研究了TiO_(2)含量对Dy_(2)O_(3)-Al_(2)O_(3)-SiO_(2)(DAS)玻璃的结晶行为、微观结构及相组成的影响,并分析了结晶过程中孔洞的形成机理。结果表明,随着TiO_( 2)含量的增加,微晶玻璃的晶化激活能先升高后降低。当TiO_(2)含量为6 wt.%时,DAS微晶玻璃的晶化激活能达到最高,说明其晶化能力最差。TiO_(2)含量变化并未改变该体系微晶玻璃的晶化形式,所有微晶玻璃样品的结晶方式均为表面结晶,且均存在Dy_(2)Si_(2)O_(7)。在TiO_(2)含量为0 wt.%的样品中还观察到球状Al_(2)O_(3)颗粒。当TiO_(2)含量高于6 wt.%的样品中则生成了Al_(2)SiO_(5)。另外,完全晶化的微晶玻璃样品中存在孔洞,孔洞的形成是由于结晶相与玻璃相之间的密度差异。孔洞的形态及分布则受到结晶相的生长速度、结晶相的致密程度与结晶相形态的共同影响。The crystallization behavior,microstructure and crystalline phases of Dy_(2)O_(3)-Al_(2)O_(3)-SiO_(2)(DAS)glass ceramics with different TiO_(2) content were investigated.The formation mechanism of pores during crystallization have been revealed.The results show that the crystallization activation energy of glass-ceramics first increases and then decreased with the increase of TiO_(2) content.The maximum crystallization activation energy of DAS glass-ceramics had been reached at the sample of 6 wt.%TiO_(2) content.The change of the content of TiO_(2) nucleating agent does not change the crystallization form of the glass-ceramics in this system.The crystallization mode of all glass-ceramics samples is surface crystallization.Dy_(2)Si_(2)O_(7) was present in all glass-ceramic samples.Spherical Al_(2)O_(3) particles were observed in the samples with TiO_(2) content of 0 wt.%,and Al_(2)SiO_(5) was formed in the samples with TiO_(2) content higher than 6 wt.%.Voids had been found in the fully crystallized glass-ceramic samples.The formation of the voids was related to the density difference between the crystalline phase and the uncrystallized glass.The position and shape of the voids formed in the crystallization process of glass-ceramics with different TiO_(2) content are affected by the growth rate of the crystalline phase,the compactness of the crystalline phase and the morphology of the crystalline phase.

关 键 词：Dy_(2)O_(3)-Al_(2)O_(3)-SiO_(2)玻璃 微晶玻璃 结晶动力学 孔洞形成机理 

分 类 号：TQ174[化学工程—陶瓷工业]