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Scratch groove and ionic packing ratio of oxide glasses
Seiji Inaba  1, *@  , Haruo Aizawa, Akio Koike@
1 : Asahi Glass Co. Ltd.
* : Corresponding author

We investigated the composition dependence of scratch resistance within a region of elastic-plastic deformation. A permanent groove eventually associated with the sub-surface lateral cracks was formed on the glass surface by Vickers indenter. The end view of the groove taken with polarized light showed a residual stress concentration at the bottom of the groove. The residual retardation highly depended on the ionic packing ratio and slightly decreased with time. The cross-section profile of the groove showed that residual indentation depth decreased with increasing Young's modulus and pile-up volume was proportional to the ionic packing ratio. These results indicate that the proportional of elastic deformation, plastic flow and densification varies depending on composition.  

 


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