【作者】 陈丽娜；

【导师】 谢俊；

【作者基本信息】 武汉理工大学 ， 材料科学与工程， 2022， 硕士

【摘要】 锂铝硅玻璃具有较好的热稳定性、机械性能、耐腐蚀性能等,广泛应用于手机电脑和平板等智能设备。锂铝硅玻璃,是制备电子显示设备盖板玻璃的基础,研究锂铝硅基础玻璃的组成-结构-性能之间的关系对新型盖板玻璃的开发意义重大。本文以Li₂O-Al₂O₃-Si O₂-Mg O-K₂O-Na₂O为基础玻璃组分,分别探讨了Al₂O₃/Si O₂质量比,Na₂O/Li₂O质量比和Zr O₂含量对玻璃性能的影响。（1）探索了当Al₂O₃/Si O₂质量比从0.236增加到0.342时,玻璃的热性能、机械性能、介电性能、化学稳定性和结构的变化规律。研究结果显示,当Al₂O₃/Si O₂质量比从0.236增加到0.342时,玻璃的T_g从457℃增加到470℃,玻璃的热膨胀系数从10.8×10^-6/℃降低到10.5×10^-6/℃。当Al₂O₃/Si O₂质量比从0.236增加到0.342时,玻璃的密度、弹性模量和维氏硬度都呈现增加的趋势,抗折强度从94.88 MPa降低到57.86 MPa。根据傅里叶红外光谱测试结果,玻璃网络中桥氧的数目随着Al₂O₃/Si O₂质量比的增加呈现上升的趋势。根据拉曼光谱拟合结果可知,Q⁴的含量随着Al₂O₃/Si O₂质量比的增加而增加,玻璃的结构趋于紧密,这是导致玻璃的机械性能发生变化的原因。当Al₂O₃/Si O₂质量比从0.236增加到0.342时,玻璃的质量损失率在增加,玻璃的化学稳定性在降低。当Al₂O₃/Si O₂质量比从0.236增加到0.342时,玻璃的介电常数从7.74增加到13.01,介电损耗从1.07×10^-3增加到1.79×10^-3。（2）探索了当Na₂O/Li₂O质量比从1.111增加到2.800时,玻璃的热性能、机械性能、介电性能、化学稳定性和结构的变化规律。研究结果显示,当Na₂O/Li₂O质量比从1.111增加到2.800时,玻璃的T_g从473℃到495℃,玻璃的热膨胀系数呈现先减小后增加的趋势,当Na₂O/Li₂O质量比为1.714和2.217时,玻璃的热膨胀系数较小,分别为11.01×10^-6/℃和11.00×10^-6/℃;玻璃的介电常数,密度,弹性模量和硬度随Na₂O/Li₂O质量比的增大呈现增大的趋势,当Na₂O/Li₂O质量比增大时,抗折强度先增加后减小,并且在Na₂O/Li₂O质量比为1.7时,抗折强度达到最大值80.90 MPa。根据玻璃的拉曼拟合图谱,Q⁴的含量随Na₂O/Li₂O质量比的增大而降低,这是导致玻璃的机械性能变化的原因。随着Na₂O/Li₂O质量比的增加,锂铝硅玻璃样品的耐酸碱（HF、Na OH）腐蚀性先减小后增大,当Na₂O/Li₂O质量比在1.714～2.217之间时最佳。（3）探索了当Zr O₂含量从0 wt%增加到2.5 wt%时,玻璃的热性能、机械性能、介电性能、化学稳定性和结构的变化规律。研究结果显示,当Zr O₂含量从0 wt%增加到2.5 wt%时,玻璃的T_g从480℃减小到458℃,玻璃片的析晶温度T_p呈现先降低后增加的趋势。当Zr O₂含量从0 wt%增加到2.5 wt%时,玻璃片测试样的密度、弹性模量、显微硬度和抗折强度都增加。根据玻璃的拉曼图谱可知,玻璃结构中的Q⁴和Q³所占的比例在增大,玻璃结构中硅氧基团结构单元的连接程度增加,这是导致玻璃的机械性能发生变化的原因。随着组分中Zr O₂含量的增加,玻璃的介电常数由6.95增加到12.58,玻璃片的耐酸性测试失重率从0.1166%减小到0.0851%,耐碱性测试失重率从0.0148%减小到0.0083%。当Zr O₂含量大于1wt%时,玻璃失重率几乎无变化,处于稳定状态。更多还原

【Abstract】 Lithium aluminum silicon glass has good thermal stability,mechanical properties,and corrosion resistance.It is widely used in smart devices such as mobile phones,computers,and tablets.Lithium aluminum silicon glass is the basis for the preparation of cover glass for electronic display equipment.The research on the relationship between composition,structure,and performance of lithium aluminum silicon glass preferredmaterialtoproducecoverglass.Basedon Li₂O-Al₂O₃-Si O₂-Mg O-K₂O-Na₂O,the effects of Al₂O₃/Si O₂mass ratio,Na₂O/Li₂O mass ratio and Zr O₂content on the properties of glass were discussed.（1）The changes of thermal properties,mechanical properties,dielectric properties,chemical stability,and structure of glass when the mass ratio of Al₂O₃/Si O₂increases from 0.236 to 0.342 are explored.The results show that when the mass ratio of Al₂O₃/Si O₂increases from 0.236 to 0.342,the T_gof glass increases from457℃to 470℃,and the coefficient of thermal expansion of glass is from 10.8×10^-6/℃reduced to 10.5×10^-6/℃.When the mass ratio of Al₂O₃/Si O₂increases from0.236 to 0.342,the density,elastic modulus and Vickers hardness of glass increased,and the flexural strength of glass increases from 94.88 MPa to 57.86 MPa.According to the Raman fitting results,the content of Q⁴increases with the increase of Al₂O₃/Si O₂mass ratio,and the structure of the glass tends to be compact,resulting in the change of mechanical properties of the glass.When the mass ratio of Al₂O₃/Si O₂increases from 0.236 to 0.342,the mass loss rate of glass increases and the chemical stability of glass decreases.When the mass ratio of Al₂O₃/Si O₂increases from 0.236to 0.342,the dielectric constant of the glass increases from 7.74 to 13.01,and the dielectric loss of the glass increases from 1.07×10^-3increased to 1.79×10^-3.（2）The changes of thermal properties,mechanical properties,dielectric properties,chemical stability,and structure of the glass were explored when the mass ratio of Na₂O/Li₂O increases from 1.111 to 2.800.The results show that when the mass ratio of Na₂O/Li₂O increases from 1.111 to 2.800,the T_gof glass increases from 473℃to 495℃,and the thermal expansion coefficient of glass decreases first decreases and then increases.When the mass ratio of Na₂O/Li₂O is 1.714 and 2.217,the thermal expansion coefficient of glass is small,which is 11.01×10^-6/℃and 11.00×10^-6/℃respectively.The dielectric constant,density,elastic modulus,and hardness of glass show an increasing trend with the increase of Na₂O/Li₂O mass ratio.When the mass ratio of Na₂O/Li₂O increases,the flexural strength first increases and then decreases,and when the mass ratio of Na₂O/Li₂O is 1.714,the flexural strength reaches the maximum value of 80.90 MPa.According to the Raman fitting spectrum of glass,the content of Q⁴decreases with the increase of Na₂O/Li₂O mass ratio,which is the reason for the change of glass properties.With the increase of Na₂O/Li₂O mass ratio,the corrosion resistance of lithium aluminum silicon glass samples to acid and alkali（HF and Na OH）decreases first and then increases.When the Na₂O/Li₂O mass ratio is between 1.714～2.217,it is the best.（3）The changes of thermal properties,mechanical properties,dielectric properties,chemical stability,and structure of the glass were explored when the Zr O₂content increased from 0 wt%to 2.5 wt%.The results show that when the Zr O₂content increased from 0 wt%to 2.5 wt%,the T_gof glass decreases by 4.5%from380℃to 458℃.When the Zr O₂content increases from 0 wt%to 2.5 wt%,the crystallization temperature T_pof the glass sheet first decreases and increases.When the Zr O₂content increases from 0 wt%to 2.5 wt%,the density,elastic modulus,microhardness,and flexural strength of glass test samples increased.According to the Raman spectrum of glass,the proportion of Q⁴and Q³in the glass structure is increasing,and the connection degree of silicon oxygen group structural units in the glass structure is increasing,resulting in the change of mechanical properties of glass.With the increase of Zr O₂content in the component,the dielectric constant of the glass increases from 6.95 to 12.58,with an increase of about 44.8%,the weight loss rate of acid resistance test decreased from 0.1166%to 0.0851%,and the weight loss rate of alkali resistance test gradually decreased from 0.0148%to 0.0083%.It shows that when the Zr O₂content is greater than 1 wt%,the chemical stability of the glass is in a stable state.更多还原