Effects of Temperature and Time of Ion-Exchange on the Mechanical Behavior of Chemically Toughened Soda-Lime Glass

Seun Samuel Owoeye, Akinwumi Gbenga Owoyemi

Abstract


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. 


Keywords


Ion exchange, Chemically toughened glass, Hardness, Impact strength, Flexural strength, Microstructure.

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