Single-Side Ion Exchange Strengthening of Holed Float Glass

Karlsson, Stefan, 1984- (författare): Linnéuniversitetet,Institutionen för teknik, TEK,Glass group

Jonson, Bo (författare): Linnéuniversitetet,Institutionen för teknik, TEK,Glass Group

Johansson, Marie (författare): Linnéuniversitetet,Institutionen för teknik, TEK

Enquist, Bertil (författare): Linnéuniversitetet,Institutionen för teknik, TEK

(creator_code:org_t)

Abstract Ämnesord

Stäng

The fracture strength of oxide glasses is to a large degree influenced by other factors than the inherent strength of the bonds in the vitreous network such as surface defects. Due to the brittle nature of glass, mechanical processing decreases the strength substantially. The aim of this study was to investigate ion exchange strengthening also known as chemical strengthening of commercially available mechanically processed soda-lime-silicate float glass and to compare it with as-received float glass by means of flexural fracture load. The dimensions of the samples were 66±2 x 66±2 mm and two series had 7 mm diamond drilled holes in the centre of each sample while one series was as-received. Ion exchange of sodium ions by larger potassium ions were performed by treating the air-side of a series of samples with a KNO3:KCl mixture at 450 °C. The flexural fracture load of both untreated and ion exchanged holed samples was measured by means of the coaxial double ring test. The ion exchanged samples showed an arithmetic mean fracture load increase of approximately 140% compared to untreated holed float glass. The drilled hole decreases the arithmetic mean fracture load to approximately 25% of as-received float glass whilst the strengthening effect of the ion exchange improves it to around 65% of as-received float glass.

Av författaren/redakt...: Karlsson, Stefan ...; Jonson, Bo; Johansson, Marie; Enquist, Bertil

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