离子交换玻璃表面性质研究

针对离子交换增强玻璃稳定性问题,详细研究了由钾离子作为增强离子的玻璃表面性质.利用光学显微镜观察玻璃表面在加速风化条件下表面被侵蚀的情况,并用原子吸收光谱(AAS)研究玻璃在该加速风化条件下,表面K+偏析的情况.通过场发射扫描电子显微镜(FEGSEM)测试K+离子交换深度,用X射线光电子能谱(XPS)研究玻璃在离子交换前后表面元素含量的变化.研究表明,在加速风化条件下,离子交换增强玻璃表面较普通玻璃更容易受到侵蚀,K+离子向表面偏析明显.研究发现造成此种现象的原因是:在交换过程中,处于KNO3电解质中的玻璃表面吸附一层K+离子,形成Sterm紧密层,由于Stern层的距离只有几纳米,玻璃表面对K+的吸附力非常大,离开溶液后,表面层的活性大量K+离子依旧存在玻璃表面,致使离子交换玻璃表面稳定性降低.

Study on Surface Property of Ion Exchange Glass

According to durability of glass surface,the ion exchange glass surface in which potash served as enhancing ion was strdied. Under acceleration weathering conditions,appearances of glass surface and potash ion eduction were measured by optical miceroscopy and AAS respectively. Exchange depth of K+ was tested by FEGSEM and the element contents of the surface before and after the exchange were strdied by XPS. The inrestigation indicates that the surface of the ion exchange glass is easier to be corroded than that of flat glass and K+ eduction is evidently. The reason of the above phenomenon is that during exchange process,the surface of glass dipped in KNO3 electrolyte,absorbs a layer of K+ and forms Stern compact layer which is only several decadas A deep with great adsorbatility. It is for K ions still actively existing in surface after the glass leaved solution that weakens surface durability of ion exchange glass greatly.