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   TiTitanium

(L. Titans, the first sons of the Earth, myth)

Ti at. wt. 47.90
   at. no. 22
   m.p.  1675°C
   b.p.  3260°C 
   sp.gr. 4.54
   valence 2, 3, or 4. 

Titanium was discovered by Gregor in 1791and named by Klaproth in 1795. Impure titanium was prepared by Nilson and Pettersson in 1887; however the pure metal (99.9%) was not made until 1910 by Hunter by heating TiCI₄ with sodium in a steel bomb. Titanium is present in meteorites and in the sun. Rocks obtained during the Apollo 11 lunar mission showed presence of 7 to 12 % TiO₂. Preliminary analysis of rocks obtained during the Apollo 12 mission showed lower percentages. Titanium oxide bands are prominent in the spectra of M Type stars. The element is the ninth most abundant in the crust of the earth. Titanium is almost always present in igneous rocks and in the sedi- ments derived from them. It occurs in the minerals rutile, dmenite, 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. The metal was a laboratory curiosity until Kroll, in 1946, showed that titanium could be produced commercially by reducing titanium tetrachloride with mag- nesium. This method is largely used for producing the metal today. The metal can be purified by decomposing the iodide. Titanium, when pure, is a lustrous, white metal. It has a low density, good strength, is easily fabricated, and has excellent corrosion resistance. It is ductile only when it is free of oxygen. The metal burns in air and is the only element that burns in nitrogen. Titanium is resistant to dilute sulfuric and hydrochloric acid, most organic acids, moistchlorine gas, and chloride solutions. Natural titanium consists of five isotopes with atomic masses from~46 to 50. All are stable. Four other unstable isotopes are known. Natural titanium is reported to become very radioactive after bombardment with deu- terons. The emitted radiations are mostly positrons and hard gamma rays. The metal is dimorphic. The hexagonal a form changes to the cubic fi form very slowly at about 8800C. The metal combines with oxygen at red heat, and with chlorine at 5500C. Titanium is important as an alloying agent with aluminum, molybdenum, manganese, iron, and other metals. Alloys of titanium are principally used for aircraft and missiles where light-weight, strength, and ability to withstand extremes of temperature are important. Titanium is as strong as steel, but 45 % lighter. It is 60% heavier than aluminum, but twice as strong. The A-11 jet plane, which flies at 2000 miles/hr., is largely constructed of titanium. Each SST jet plane is expected to consume 600,000 lbs. Titanium has potential use in desalination plants for converting sea water into fresh water. The metal has excellent resistance to sea water and is used for propeller shafts, rigging, and other parts of ships exposed to salt water. A titanium anode, coated with platinum has been used to provide cathodic protection from corrosion by salt water. Titanium metal is considered to be physiologically inert. When pure, titanium dioxide is relatively clear and has an extremely high index of refraction with an optical dispersion higher than diamond. It is produced artificially for usr as a gemstone, but it is relatively soft. Star sapphires and rubies exhibit their asterism as a result of the presence of TiO2. Titanium dioxide is extensively used for both house paint and artist's paint, as it is permanent and has good covering power. Titanium paint is an excellent reflector of infrared, and is extensively used in solar observatories where heat causes poor seeing conditions. Titanium tetrachloride is used to iridize glass. This compound fumes strongly in air and is used to produce smoke screens. The price of titanium mill products is about $6/lb. Its use is growing rapidly, and by 1978, it is expected that 10 million pounds of the metal will be used.

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