Titanium is a chemical element, chemical symbol Ti and atomic number 22, is a kind of transition metal silvery white, is characterized by light weight, high strength, with a metallic luster, good corrosion resistant ability (including sea water and aqua regia and chlorine gas).Due to its stable chemical properties of good resistance to high temperature, low temperature resistance, acid resistance, alkali resistance, and high strength, low density, by reputation for "metal" in space.Titanium in 1791 by Gregor (William Gregor) was found in Cornwall, and by the carat prot (Martin Heinrich Klaproth) with Greek mythology Titan as its name.

Titanium is regarded as a kind of rare metal, this is due to the existence of decentralized in nature and difficult to extract.But the relative abundance of (among) all the elements in the tenth.Titanium ores are ilmenite and rutile, widespread in the earth's crust and lithosphere.Titanium also exists in almost all organisms, rock, water and soil.Extracted from the main ore titanium need kroll process or method of hunter.Titanium compounds, the most common titanium dioxide can be used in the manufacture of white paint.Other compounds include titanium tetrachloride (TiCl4) (as catalyst and words used in the manufacture of smoke or air) and titanium trichloride (TiCl3) (used in catalytic polypropylene production).

With iron, aluminum, titanium, vanadium, molybdenum, or other elements fused alloy, create a high intensity of light alloy, has been widely used in various aspects, including the space (jet engines, missiles and spacecraft), military and industrial applications (chemical and petroleum products, desalination and paper), automobile, agricultural food, medicine, prosthesis, bone graft and dental instruments and implants), sporting goods, jewelry, and mobile phone and so on.

Titanium is most useful two properties, corrosion resistance, and the strength of the metal in the highest - weight ratio.Under the conditions of the alloy, the strength of titanium is similar to some of the steel, but lighter by 45%.There are two allotropes and five natural isotope, 46 ti to 50 by ti, one of the highest abundance is 48 ti (73.8%).Chemical and physical properties of titanium and zirconium are similar, this is because both the same number of valence electrons, and belong to the group in the periodic table.