Tohoku University Technology: Residual stress evaluation method for chemically strengthened glass: T18-280
Non-contact, non-destructive and position-selective residual stress evaluation using volume variation obtained by microscopic Raman scattering spectrum
Chemically strengthened glass has become very popular as the cover glass for smartphones. This glass is made by immersing the glass in the potassium nitrate melt and exchanging ions between the sodium ions in the glass and the potassium ions in the potassium nitrate melt. Conventional methods to evaluate the chemically strengthened glass strength are the bending method and the optical waveguide method. However, these methods are not suitable for measuring locally the residual stress, and there is a limit in the glass samples that can be measured. This invention is able to evaluate the residual stresses of the chemically strengthened glass in a non-contact, non-destructive and position-selective manner. In this invention, the residual stress is calculated from the volume variation ratio which increases with ion exchange, obtained by the microscopic Raman scattering spectrum.
Inquire About This Product
basic information
For details, please contact us or refer to the PDF.
Price range
Delivery Time
Applications/Examples of results
For details, please contact us or refer to the PDF.
catalog（1）
Download All Catalogs
Company information
The revenue generated from technology transfer is reinvested into universities and researchers as new research funding, which is used to create further research outcomes. To ensure the smooth operation of this cycle, known as the "Intellectual Creation Cycle," we will actively promote technology transfer. The types of seeds we handle include patents, know-how, databases, and programs. We have established a collaborative framework by concluding basic technology transfer agreements with the following universities (as of April 1, 2026): - Tohoku University - Hirosaki University - Iwate University - Akita University - Fukushima University - Yamagata University - Tohoku Gakuin University - Iwate Medical University - Fukushima Medical University - Aizu University - Miyagi University - Hokkaido University - Muroran Institute of Technology - Showa Medical University - Asahikawa Medical University
![[Special Processing Department] We respond to new needs for glass processing.](https://image.mono.ipros.com/public/product/image/9a5/2000483118/IPROS49477542977443392050.jpeg?w=280&h=280)
