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Properties of Titanium

Physical Properties

When looking at the periodic table of elements, there is a relationship between the atomic number and physical properties. For example, Titanium is found in column four along with zirconium, hafnium, and thorium, all having similar properties for chemical inertness.


Titanium has two electrons in the outer shells with the inner shells left unfilled. When this occurs in a metal, it is known as a transition metal. Transition metals such as chromium, manganese, iron, cobalt, and nickel have unique physical properties


The atomic weight of titanium is 47.88, while aluminum has an atomic weight of 26.97, and iron 55.84.


Titanium has a body-centered cubic or hexagonal-close-packed crystalline structure.

Titanium has a high melting point of 3135°F (1725°C). This melting point is approximately 400°F above the melting point of steel and approximately 2000°F above that of aluminum.


Thermal Conductivity. Titanium is a good insulator and has a low thermal conductivity compared with stainless steel, nickel or copper.


Linear Coefficient of Expansion. If a bar or rod of titanium is uniformly heated along its length it will not grow at rates relative to steel. Titanium has a low coefficient of linear expansion which is equal to 5.0x10-6 inch per inch/°F, whereas that of stainless steel is 7.8x10-6, copper 16.5x10-6, and aluminum 12.9x10-6.


Electrical Conductivity and Resistivity. Titanium is not a good conductor of electricity. If the conductivity of copper is considered to be 100%, titanium would have a conductivity of 3.1%. From this it follows that titanium would not be used where good conductivity is a prime factor. For comparison, stainless steel has a conductivity of 3.5% and aluminum has a conductivity of 30%.


Since titanium is a poor conductor, it follows that it is a fair resistor.


Magnetic Properties. Metals have a wide variance in susceptibility and can be classified in three groups:


  • The diamagnetic metals such as copper, silver, gold and bismuth.
  • The ferromagnetic such as iron, cobalt, nickel, and gallium.
  • The paramagnetic which includes transition metals such as titanium, zirconium and hafnium.

Ferromagnetic metals retain their magnetization after being removed from the magnetic field whereas paramagnetic metals do not.