Nickel Is A Metal With Memory Function
Nickel, the chemical symbol is Ni, atomic number is 28
, with magnetic, is a transition metal. Nickel with ferromagnetic and scalability, can be electrically and thermally conductive. Room temperature, the nickel in the humid air will form a dense oxide film in the surface, can prevent not only continues to be oxidized, and can bear alkali, can bear corroding in the salt solution.
The nickel content in the earth's crust is no small, greater than common metals lead, tin, but obviously much less than iron, and the melting point of nickel and iron is similar, nickel was discovered in the 18th century on Europe after German first mixed with copper, made the so-called Germanic silver, or German silver, which is Chinese copper-nickel alloy.
In nature, the main nickel mines is the red nickel (nickel arsenide) the niccolite (sulfur nickel arsenide). Cuba is the world's most famous national reserves of nickel ore in the Dominican Republic, there are a lot of nickel ore. World metallurgical nickel accounted for 85% of the total nickel consumption. According to the information from metal powder exporter, the worlds nickel consumption is as follows: 65% stainless steel; accounted for 5% of other alloy steel; non-ferrous alloys (nickel-based alloys and copper-based alloys) accounted for 15%; plating, nickel-cadmium batteries and foundry accounted for 15%.Titanium-nickel alloy with the memory function, and the memory is very strong, after quite a long time, repeated millions of times they are still accurate. Its "memory" skills is to remember its original shape, so people call it a shape memory alloy. That this alloy has a characteristic transition temperature, above the transition temperature, it has a tissue structure, while under the transition temperature, it has another organizational structure. The structure is different, the performance is also different. For example: a nickel titanium memory alloy, when it is above the transition temperature, it is hard, high strength, and below this temperature, it is very soft and easy cold working. Thus, when we need it to remember what shape, put it into the kind of shape, this is the "permanent memory" shape below the transition temperature, because it is very soft, we can to a large extent to its arbitrary deformation. When you need to restore it to its original shape, you only need to heat it above the transition temperature.
Nickel metal is mainly used for the electroplating industry, nickel-plated items are beautiful, clean, and not prone to corrosion. Ultrafine nickel powder commonly used as a catalyst in the chemical industry. Nickel is used extensively for the manufacture of alloys. Adding nickel in the steel can be improved the mechanical strength. Nickel-chromium alloy is mainly used to make stainless steel and other corrosion-resistant alloys, such as nickel steel, nickel-chromium steel and a variety of non-ferrous alloys containing copper-nickel alloys with high nickel components, corrosion will not be easy. For hydrogenation catalyst for ceramics, specialty chemicals utensils, electronic circuits, glass with green, and a nickel compound preparation, etc.
Nickel having magnetic, can be attracted to a magnet, while the aluminum alloy of cobalt and nickel, the magnetic is stronger. This alloy by electromagnets attract is not only be sucked, and things hanging below it 60 times heavier than it will not fall off. In this way, you can use it to create electromagnetic crane. Most nickel salts are green. Nickel hydroxide is brown-black or green, nickel oxide is gray and black. The nickel oxide used to produce an iron-nickel alkaline storage battery. Nickel hydroxide is often used as a cathode material for nickel-metal hydride and nickel-cadmium batteries.
Source:http://www.mhcmp.com
by: anelwew
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