Strengthening principle and process flow of chemically strengthened glass
Chemically tempered glass is mainly made of glass with a thickness of less than 3mm. It is heated to about 420 degrees Celsius with a high-purity potassium nitrate solution and a matching catalyst. The potassium ions and sodium ions on the surface of the glass structure undergo ion exchange to form a strengthening layer.
Due to the slow exchange rate of potassium and sodium ions, in order to make the glass have a large stress value and a thickness of the stress layer that meets the requirements of use, the exchange time varies from 4 hours to 10 hours.
The depth of the compressive stress layer of chemically tempered glass generally ranges from 5um to 25um, but Corning's Gorilla Glass and AGC's Dragon Trace Glass can increase the stress layer to 50um. The bending strength can reach 600-800mpa.
White sheet finished product—QC inspection—cleaning treatment—chemical strengthening—insulation and cooling—cleaning and drying—packaging.
Main test methods for the strength of chemically strengthened glass
a, flexural strength of glass (CL) b, impact strength of glass (CT) c, depth of compressive stress layer of glass (DOL)
Method 1. Impact strength test of glass with steel ball - falling ball crushability test
Method 2, static pressure test method. Use the thimble to increase the pressure at the center of the glass until the pressure value at the moment when the glass is broken.
Method 3. Compressive stress layer depth test method---quantitatively measure the glass surface with a compressive stress tester, and calculate the pressure layer depth on the glass surface.