Amorphous alloy science knowledge


In daily life, the materials that people come into contact with are nothing more than crystalline and amorphous. In crystalline materials, the arrangement of atoms follows certain rules; Metals like salt, diamonds, and all the metals we know are crystalline materials.
  
Conversely, if the atomic arrangement is in an irregular state, it is called an amorphous material. Materials, textiles and glass all belong to the category of amorphous materials.
  
Scientific definition of amorphous alloy, amorphous alloy refers to a metal alloy with a short-range ordered and long-range disordered atomic arrangement in a solid state, also known as metallic glass. At conventional cooling rates, metals and alloys generally exist in a stable crystalline state, and amorphous alloys can only be formed under non-equilibrium conditions.

 

 

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Reni nickel catalyst science knowledge(1)

Physical and chemical properties: Reni nickel catalyst before activation is silver-gray amorphous powder (nickel-aluminum alloy powder), with a moderate degree of flammability, partial activation in the presence of water and the production of hydrogen easy agglomeration, long-term exposure to air is easy to weather. Nickel-aluminum alloy powder is activated into gray-black particles, accompanied by active hydrogen, extremely unstable, oxidative combustion in the air, must be immersed in water or ethanol for preservation. It was first used by American engineer Murray Rainey as a catalyst in the hydrogenation of vegetable oils. The preparation process is to treat nickel-aluminum alloy with concentrated sodium hydroxide solution, in this process, most of the aluminum will react with sodium hydroxide and dissolve, leaving a lot of micropores of different sizes. In this way, the surface of Raininickel is a fine gray powder, but from a microscopic point of view, each tiny particle in the powder is a three-dimensional porous structure, this porous structure greatly increases its surface area, and the large surface area brings high catalytic activity, which makes Raininickel widely used as a heterogeneous catalyst in organic synthesis and industrial hydrogenation reactions. Since "Rainey" is a registered trademark of Grace Chemicals, strictly speaking, only products manufactured by the company's Davidson Chemical Division can be called "Lanny Nickel". The term "metal backbone catalyst" or "sponge-metal catalyst" is used to refer to catalysts with a microporous structure and physical and chemical properties similar to Raney nickel.