UFAS1 PLATFORM EVENTS, International Conference on Materials Science ICMS2018

Font Size: 
Optical Transmission Improvement of Eroded Glass : Effects of the Projection's Speed and the Deposited Thin Layers of SiO2.
marouani abdelhak

Last modified: 2018-07-27

Abstract


To improve the surface state of eroded glass and restore its properties, a deposition of thin layers of metallic oxide basis (SiO2) elaborated by sol-gel technique is conducted. The work is achieved in two stages:

  • Firstly, samples of soda-lime glass are sandblasted with different projected sand masses Mp, varying the velocity V of the particles and maintaining the impact angle constant (α = 90). The objective is to get different surface states.
  • The second stage is devoted to the deposition of thin layers of SiO2 on these eroded samples in order to repair the sandblasting defects and to improve the optical transmission (OT).

The results show that after sandblasting, there is a strong increase of the roughness leading to an important falls of OT. At the raw state the OT is 91.5% at λ = 550nm. In the severe conditions tests of erosion (Mp = 200 g and V = 30 m/s), the OT decreases to 56.45%.

The deposition of silica layer basis colloidal SiO2 nanoparticles by dip-coating permit to reduce the roughness of the sandblasted samples bringing a satisfactory improvement to OT. In the case of the speeds of 20 m/s and 25 m/s, the OT increases toward 89%1%.

In the case where V = 30 m/s, the deposition of two layers of silica allows to get a good correction of the greatly damaged surface state. The measures of OT show that the values know a better progression. Besides, the microscopic observations reveal a good restoration of the surface and confirm the brought improvements.