Study On The Composition,Structure And Properties Of Alkali Aluminosilicate Flexible Glass

Flexible glass is a novel type of specialized glass material that boasts a thickness of≤0.1mm,boasting exceptional properties such as high hardness,elevated temperature resistance,exceptional flatness,and superior air tightness.These unique features enable its application in various emerging fields such as foldable smartphone screens,wearable devices,car displays,flexible solar cells,and aerospace,among others.The core performance index of flexible glass is its flexibility.However,due to the difficulty in preparing flexible glass samples,there are relatively few studies on the composition and flexibility of flexible glass.Therefore,we conducted a comparative analysis with glass fiber,which has a mature manufacturing process.Through extensive literature review and finite element analysis,we discovered that the structure and stress distribution patterns of flexible glass and glass fiber are strikingly similar when subjected to bending.Thus,this paper used an analogy experiments method to study the flexibility of flexible glass using glass fiber and further studied the effects of P₂O₅ content and Al₂O₃/SiO₂ ratio on glass structure,viscosity,and flexibility,as well as the effects of chemical strengthening on the flexibility of glass.This paper provides a new research approach for the development and design of flexible glass composition.The main research results are as follows:（1）The findings of this study indicate that the high alumina,medium alumina,and soda lime silicate glasses exhibit distinct high temperature viscosities,with high alumina silicate glass demonstrating the highest viscosity and a melting temperature of 1701.71℃.Chemical strengthening enhances the surface compressive stress and the depth of the stress layer of high-alumina silicate glass.The flexibility results show that the flexibility of 0.1 mm diameter high alumina silicate glass fiber is better than that of sodium calcium silicate glass fiber,with minimum curvature radii of 3.73±0.51 mm and 4.26±0.38 mm,respectively.The flexibility of 0.1 mm thick high alumina silicate flexible glass is superior to that of sodium calcium silicate flexible glass,which is consistent with the conclusion of glass fiber flexibility.The minimum curvature radii are 6.43±0.36 mm and 7.05±0.61 mm,respectively.Therefore,qualitative analysis of the flexibility of glass can be conducted using the flexibility tests of different components of glass fibers.（2）As the P₂O₅ content increases from 0 to 1.54 mol%,the degree of network connectivity of the glass increases,and the Vickers hardness decreases from 519.0±10 MPa to 498.5±5 MPa.The effect of P₂O₅ on the viscosity of the glass varies at different temperature stages.When T≤690℃,the addition of P₂O₅ reduces the viscosity of the glass;when T>690℃,the addition of P₂O₅ increases the viscosity of the glass,and the melting temperature increases from 1589.69℃to 1616.05℃.Chemical strengthening enhances the depth of the stress layer of the glass as the P₂O₅ content increases from 0 to 1.54 mol%,while the surface compressive stress decreases.However,the trend of Vickers hardness change is not consistent at different chemical strengthening temperatures.The addition of P₂O₅ reduces the Vickers hardness of the glass at370℃and 390℃,but increases it at 410℃.The flexibility test shows that the flexibility of the glass increases with increasing P₂O₅ content,with the minimum curvature radius decreasing from 4.09±0.32 mm to 3.66±0.41 mm.Meanwhile,chemical strengthening improves the flexibility of the glass,with the maximum improvement achieved at 390℃for 0.5 h,with an average decrease in minimum curvature radius of 24.4%.（3）As the Al₂O₃/SiO₂ ratio increases from 0.02 to 0.27,the degree of network connectivity of the glass increases,and the Vickers hardness increases from 486.5±5 MPa to 547.1±10 MPa.The viscosity of the glass also increases as Al₂O₃ replaces SiO₂,with the melting temperature increasing from 1601.59℃to 1629.51℃.Chemical strengthening enhances the depth of the stress layer and the surface compressive stress of the glass,and the Vickers hardness also increases as the Al₂O₃/SiO₂ ratio increases from 0.02 to 0.27.The flexibility test shows that the flexibility of the glass increases with increasing Al₂O₃/SiO₂ ratio,with the minimum curvature radius decreasing from 4.30±0.61 mm to 3.50±0.38 mm.Additionally,chemical strengthening improves the flexibility of the glass,with the maximum improvement achieved at 390℃for 1h,with an average decrease in minimum curvature radius of 29.6%.