
TITANIUM (Ti, atomic number 22) Titanium is a lustrous grey metallic
element used principally to make lightweight, resistant alloys. It is
one of the transitional elements of the periodic table and has many
desirable properties, most notably its incredible strength and
durability.
Titanium is abundant on Earth and has been detected in meteorites, in
our sun and other stars, titanium oxide bands being particularly
prominent in the spectra of M type stars. Titanium is also found on our
moon, rocks obtained during the Apollo 17 mission showed presence of
titanium oxide (TiO2).
Titanium is immune to corrosive attacks by saltwater and marine
atmosphere and exhibits exceptional resistance to a broad range of
corrosive gases, acids and alkalis. Titanium is immune to
microbiologically influenced corrosion and is physiologically inert and
hypoallergenic. Titanium is virtually non-magnetic, making it ideal for
applications where electromagnetic interference must be minimized. Pure
titanium is about as strong as steel yet nearly 50% lighter. When added
to various alloys, its hardness, toughness and tensile strength can be
increased dramatically.
Titanium is never found uncombined and occurs as an oxide in ilmenite,
rutile and sphene, and is present in titanates and in many iron ores.
Titanium is present in the ash of coal, in plants, and in the human
body. Titanium is ductile only when it is free of oxygen and nitrogen
(air), melting at 1660C (3020F) and boiling at 3287C (5949F). The
complex process of converting titanium ore into metal has only been
commercially viable for a little more than 50 years. The use of titanium
has since then expanded by an average of 8% per year.