The various alloys we use in modern times generally have the characteristics of high hardness, light weight and strong corrosion resistance, which have played a big role in the modernization of society. Among so many alloys, there is an alloy that has excellent properties and is widely used, that is, titanium alloy. Here are several facts about titanium alloy.
Although titanium is widely present on the earth, it is difficult to be exploited. As early as 1791, an amateur British mineralogist and church priest William Gregor dug up some black sand in the stream near Cornwall.
Then in 1795, the German chemist Martin Heinrich Krapros also discovered this strange oxide, which is named “titanium oxide”. Although it was discovered as early as the end of the 18th century, it was not until 1910 that pure titanium was separated from the oxide. In other words, it takes more than one hundred year from the discovery of titanium to its application.
Titanium alloys are excellent in performance and were mainly used in the military industry at the beginning of development. Pure titanium has the highest strength-to-weight ratio of any metal on the planet. It is as strong as steel but 45% lighter. At present, titanium alloy products are mainly used in aircraft engines, aircraft fuselages, rockets and etc. The world’s largest passenger aircraft, the Airbus A380, uses more than 70 tons of titanium, mainly for engines. In the submarine, titanium is also widely used. For example, the famous “Typhoon” class nuclear submarine in Russia uses a large amount of titanium alloy, the main purpose of which is to reduce weight.
Many metal products are exposed to rust in the air, while titanium products do not have such problems, because their surface are covered with a thin layer of titanium dioxide (TiO2), which actually protects the underlying titanium from any type of corrosion, including electrochemistry, microbial and stress corrosion. Due to this property, titanium alloy products are well suited to function in a variety of highly corrosive environments. For example, the submarines mentioned above are constantly immersed in seawater, which is rich in various ions and is highly corrosive. Normal metal products will be corroded quickly, but titanium alloys will not.
Titanium is “probiotic”, which means it blends well with human tissues and bones. Titanium products are widely used in medical devices and can be used to manufacture a variety of human joints (such as knee joints, shoulder joints, flank joints, etc.). These artificial titanium products are light and have the same elasticity as human bones, which can maintain the normal activity of human body.
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