Difference between titanium and titanium alloy

Titanium is a chemical element, chemical symbol Ti, atomic number 22, in the periodic table of chemical elements in the fourth period, the IVB group. It is a silver-white transition metal characterized by light weight, high strength, metallic luster and resistance to wet chlorine corrosion. But titanium can not be used in dry chlorine gas, even if the temperature is below 0℃ dry chlorine gas, will also take place drastic chemical reaction, generate titanium tetrachloride, and then decompose to generate titanium dichloride, and even combustion. Only when the water content of chlorine is above 0.5% can titanium remain reliably stable in it. [1]

Titanium is considered a rare metal because it is dispersed in nature and difficult to extract. But it is relatively abundant, ranking tenth among all the elements.

Titanium ores mainly include ilmenite and rutile, widely distributed in the Earth's crust and lithosphere. Titanium is also found in almost all living things, rocks, water and soil. The extraction of titanium from the main ore is done by the Croyle process

Or Hunter's method. The most common compound of titanium is titanium dioxide, which is used to make white pigments. Other compounds include titanium tetrachloride (TiCl4) (used as a catalyst and as air cover for smoke screens) and titanium trichloride (TiCl3) (used as a catalyst for the production of polypropylene).

Titanium alloy is an alloy based on titanium with other elements. There are two kinds of homogeneous heterocrystals of titanium: α-titanium with dense hexagonal structure below 882℃ and β-titanium with body-centered cubic structure above 882℃.

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