Many people will focus on the smartphone screen, such as screen resolution, screen size, screen material, screen color and brightness of the screen and so on. The cover on the outside layer of protective glass screen that was relatively less attention, and now is the time to understand our next flower protection beauty.
Tempered glass
annual user fee for repairing broken screens around $ 1 billion, as well as part of the user choose to continue to endure cracked screen. 2014 Most of the flagship high-end machines are used as a third-generation Corning Gorilla Glass screen protection, it is also a kind of tempered glass. Tempered glass is the result of multi-channel thermal and chemical processes, and therefore more robust than ordinary glass.
If you look at a piece of glass under a microscope, you will find the above have many small flaws and tiny cracks. These tiny cracks easily lead to rupture of the screen. For example, as long as sufficient force is applied on the glass, the original small cracks will expand, eventually leading to fragmentation of the glass block.
Imagine you, you now have two pieces of paper, a paper intact, another sheet of paper in the middle there is a small crack, gently tear the latter was torn. Now, imagine you then, if small cracks appeared at the edge of the paper, then this piece of paper would be more likely to be torn. That is, the easier the pressure edges and sharp corners in the work. That is why when the window in favor of craftsmen to create rounded corners.
In fact, there are many ordinary glass tiny flaws and cracks, tempered by a variety of different techniques to stitch these cracks.
Corning Gorilla glass is a glass belonging to aluminosilicate glass, is the most commonly used smartphone glass, such as Galaxy S5, HTC One M8 and iPhone are using Corning Gorilla Glass.Thermal power system generated external compressive force on the glass, forcing a small gap on the screen closely to enhance the robustness of Gorilla Glass. In addition to the thermal power system, Gorilla Glass but also through a chemical process called ion exchange, this procedure can also be reinforced glass firmness.
This glass contains a number of the production process of sodium, when immersed in hot-melt glass potassium, potassium ions into the glass melt, the position of substitution of sodium ions.Potassium than sodium ions, which will produce pressure on the glass surface, the same as the tempering, the glass becomes so strong.
Tempered glass is very strong, third-generation Corning Gorilla Glass than most metal hard surface of the phone may be the most rugged places. When a user on the phone with a unified key pocket, the screen will not be scratched keys, but the phone back will leave marks.
Next we look at the technical indicators Gorilla Glass, the different levels of description of different hardness:
Young's modulus: elastic material, the higher the coefficient, the higher the hardness, but the side effects is to increase the brittleness of the material.
Poisson's ratio: unidirectional material in tension or compression, transverse normal strain and axial strain being the absolute value of the ratio. Imagine stretched bubble gum, the middle will become thinner.
Shear modulus: Materials for trimming reaction, which is an important factor in preventing the formation of cracks.
Fracture toughness: measure the crack growth resistance of the material.
We will post Corning Gorilla Glass 3 with the latest release of Corning Gorilla Glass 4 comparison, the fourth generation of the Young's modulus is low, it also means that the fourth generation of the crispness of the glass decreases.
However, we also found that in terms of the chemical firm, increasing the thickness of the layer of the fourth generation, from 40 μm to 90 μm, shatterproof, and anti-crack growth which means that the fourth generation of Gorilla Glass has been enhanced. Below is the third and fourth generation of anti-corruption capacity Corning Glass comparison:
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