柔性玻璃的化学强化及其力学性能研究

Chemical Strengthening and Mechanical Properties of Flexible Glass

具有高弯曲强度的柔性玻璃是柔性电子显示的重要组成部分,但柔性玻璃本质是脆性材料,因此其力学性能仍然不能满足使用要求。化学强化是提高柔性玻璃弯曲半径、抗划伤性等力学性能的有效途径,本文采用一步化学强化法,将90μm超薄高铝柔性玻璃在纯硝酸钾熔盐中进行强化,研究离子交换工艺对样品表面应力、维氏硬度及弯曲半径的影响规律。结果表明:在380℃进行1 h的离子交换后,样品的表面压应力达834.1 MPa,应力层深度为15.91μm,此时玻璃具有最佳的弯曲性能和耐划伤性;经化学强化后,90μm柔性玻璃的最小弯曲半径可由(29.8±0.73)mm降低至(6.94±0.99)mm;随着继续升高交换温度和延长时间,柔性玻璃的力学性能会有所降低。

Flexible glass with high bending strength is a remarkable component of flexible electronic displays.However,flexible glass is a brittle material inherently,and its mechanical properties still do not meet the requirements of application.To address this challenge,the application of chemical strengthening stands out as a viable approach to significantly bolster scratch resistance and bending strength in flexible glass.90μm ultra-thin high-aluminum flexible glass was reinforced in the molten potassium nitrate using a conventional one-step chemical strengthening method.The effect laws of chemical strengthening temperature and time on the surface stress,Vickers hardness and bending radius of the strengthened flexible glass were investigated.The results indicate that,after ion-exchange at 380℃for 1 h,the compressive stress of sample reaches 834.12 MPa,and the depth of stress layer is 15.91μm,at which time the glass samples have the best bending performance and scratch resistance.After chemical strengthening,the bending radiu of 90μm flexible glass reduces from(29.8±0.73)mm to(6.94±0.99)mm.As the overly increasing exchange temperature and excessive prolongation of time,the mechanical properties of flexible glass are weakened.