Why is Titanium Common But So Expensive?

Introduction to Titanium00:00:00

Titanium, the 22nd element, is found in nature as an oxide. When refined into metal, it becomes silver-colored, extremely light, and incredibly strong. It's also anti-corrosive and some consider it the strongest metal on Earth.

Discovery and Abundance of Titanium00:00:39

William Greger discovered titanium oxide in 1791, and Martin Klaproth named it after the Greek Titans a year later. Titanium is not a rare metal; it's quite abundant on Earth, especially in oxide form, and can be found in almost every country. China is the leading exporter, accounting for 29% of global titanium.

The Challenge of Purifying Titanium00:01:46

While common, turning titanium oxide into pure titanium metal is difficult. Titanium atoms in oxide form are strongly bonded to oxygen atoms and do not easily separate. The metal's value makes this challenging purification worthwhile.

Properties and Applications of Titanium00:02:29

Titanium is 40% lighter and significantly stronger than steel, making it ideal for high-end applications like aerospace technology, rocket technology, and luxury hypercars. Elon Musk noted that the lack of ancient pure titanium suggests a less advanced past.

Titanium Dioxide and its Uses00:03:13

Titanium ore yields titanium dioxide (a white powder), which is widely used as a pigment in paints, especially white paint, because it's the cheapest method for achieving white coloring.

The Purification Process (Kroll Process)00:04:01

To obtain titanium metal, titanium dioxide is reacted with hydrochloric acid to form titanium tetrachloride, which removes oxygen. Then, magnesium is added at 825 degrees Celsius to purify it, a complex and energy-intensive procedure.

Specialty Applications of Titanium00:05:30

Titanium is used in niche areas where cost is not the primary concern, such as the SR-71 Blackbird aircraft. Its ability to withstand high pressure also makes it suitable for laboratory containers, and its non-magnetic properties are crucial for electromagnetic laboratories.

Biomedical and Other Uses00:06:49

Titanium is commonly used in the human body for bone replacements, like hip bones, often combined with polyethylene for reduced friction. It also appears in jewelry, medical screws, expensive sports equipment (tennis rackets, bicycle frames), and certain electronics.

The Cost of Titanium00:07:45

Despite its abundance, titanium is very expensive due to its difficult purification. One kilogram of 99.99% pure titanium costs about $111.42, making it over 230 times more expensive than steel, which costs approximately 50 cents per kilogram.