Chinas First Preparation of Ultra-high Purity Rare Earth Modified Alumina
What is Alumina?
Alumina. Chemical formula Al2O3. The ionic crystals are used to manufacture refractory materials. They have a melting and boiling point at high temperatures of 2054 deg C.
Diaspore and bauxite are used as raw materials to make industrial alumina. Al2O3 with high purity is prepared by chemical means. Al2O3 contains many isomorphous crystalline forms. There are currently over 10 different types of crystals. They have different properties. At temperatures above 1300 deg C, they are almost completely transformed into a a-Al2O3.
Modified alumina of ultra high purity with rare earth:
Shanghai Jiaotong University has put in operation the pilot project of rare Earth modified high-purity sapphires, independently researched and developed. For the first time, alumina high purity products with 5N purity (purity greater 99.999%) were produced on this production line. The high-purity product is the top-end of the aluminum industry, and it's the primary raw material for artificial sapphire. The new project is able to fill in the blanks left by the international high-purity rare earth aluminum preparation technology. It will also allow the high purity aluminum industrial chain as well as the artificial sapphire industry chain to realize the entire line.
The R&D team in China has created the first ultra-high purity aluminum purification technology and equipment that is protected by complete intellectual property rights. Professor Zhang Wei is the team leader. He said that this new technology perfectly combines a high-purity alumina filtration process with specialized technology for preparing rare earth materials. The addition of rare Earth not only improves the toughness but also the color brightness and hardness. Now that the technology has improved greatly, it is possible to prepare ultra-high purity aluminum ingots 6N and produce large quantities of 5N ingots.
According to the current understanding, high-purity aluminium hydrolysate with a purity of at least 5N is used as the primary raw material in producing single-chip sapphire-LED substrates. Sapphire is the substrate of choice for more than 90 percent of LED manufacturers worldwide. High-purity Alumina is widely used as a substrate material for LEDs.
Pan Tianlong said that this new product wasn't available on the marketplace. Our ultra high purity aluminum ingots close the gap in production technology. The aluminum industry is our upstream. Chain, downstream the artificial sapphire chain. First time, a seamless connection between these two industrial chains is made by this new product. Next, we'll gradually move products onto mobile phone screens, high-end camera lenses and ceramic targets. "And there are many other production uses."
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