iPhone7 Patent Relates to Tungsten Crucible Made Sapphire Technology

US Apple company (Apple Inc.) purchased a large number of sapphire glass, and proposed the "electronic device housing ceramic protective glass" patent. This patent describes the technology in detail of how to install sapphire glass in iPhone. iPhone6 ​​/ 6s launched in 2015 failed using sapphire screen, but Apple Inc did not stop research the application of sapphire glass on the phone. According to the patent released by Apple Inc shows that the company is planning a new sapphire screen technology. In addition, the company also plans to add reinforced ceramic material in the housing frame, such as ceramic fibers or other material. Many people speculated that iPhone7’s phone screen will likely use sapphire screen.

The chemical composition of sapphire crystal is alumina (α-Al2O3), and it is composed of three oxygen atoms and two aluminum atoms by covalently bonded type. Sapphire crystal widely used in smart phones, mainly because the sapphire crystal has many good characteristics such as high hardness, high temperature, wear resistance, chemical corrosion resistance and chemical stability and so on.

Tungsten products as the important material in sapphire growth furnace for sapphire single crystal production quality have a greater impact. Tungsten crucible is an important carrier of sapphire single crystal growth furnace, mainly because tungsten crucible has high purity, high density, crack-free, smooth inner and outer walls and other features. In addition, tungsten is an insoluble and refractory metal which is hard to react with aluminum. Thereby it can produce sapphire single crystal with good performance. Using Kyropoulos method to nurture sapphire single crystal in sapphire growth furnace was heating alumina by tungsten crucible to above 2050 ℃, then gradually lower the melting temperature, crystallized to be finished.

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