Effects of Temperature and Time of Ion-Exchange on the Mechanical Behavior of Chemically Toughened Soda-Lime Glass
The effect of immersion time and heating temperature on the mechanical properties of chemically toughened glass was examined. The glass samples of 100×100×20 mm were first immersed in 2 M of NaNO3 salt solution at 450 °C for 4 hr to enrich the surface of glass samples with sodium ions then dipped in 2 M KNO3 solution each at different temperature and time of immersion. Mechanical tests were performed on the samples. The results obtained show that sample C has the highest value of hardness 58.3 HRC while samples A, B, and D also display a better hardness value of 45.7, 57.5, and 55.2 HRC respectively compared with un-treated sample with hardness 40.9 HRC. The impact test also shows that sample C has the highest impact strength of 1.25 KJ/m; sample B has the least impact strength of 0.19 KJ/m while the untreated glass has 0.37 KJ/m. The microstructure examination shows that samples B and C display a structure in resemblance with lamella structure displayed by most composites while samples C and D display the highest flexural strength of 144 and 135.5 MPa respectively.
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