Is titanium a rare metal? What are its properties and uses?

Titanium is a transition metal and has been considered a rare metal for some time. From the 1940s onwards, titanium and its compounds are widely used in aircraft, rockets, missiles, artificial satellites, spaceships, ships, military, medical and petrochemical fields; because titanium has a high melting point, hardness, plasticity, low density, corrosion resistance, etc.; titanium looks like steel, with a silvery-gray light translation. Titanium's strength, titanium alloy tensile strength of 180kg/mm3. titanium is characterized by low density (4.51g/cm3), hardness, high melting point (1675 ℃), high purity titanium has a good plasticity, but when the presence of impurities become brittle and hard. At room temperature titanium does not act with chlorine, dilute sulfuric acid, dilute hydrochloric acid and nitric acid, but can be eroded by hydrofluoric acid, phosphoric acid, molten alkali. Titanium is easily dissolved in H2SO4, titanium's most outstanding property is the strong corrosion resistance to seawater. Titanium in the earth's crust accounts for about 0.42% of the total weight in the metal world ranked seventh, containing titanium minerals up to more than 70 kinds. At present, the use of titanium is developing rapidly, has been widely used in airplanes, rockets, missiles, satellites, spaceships, ships, military, light industry, chemical industry, textiles, medical and petrochemical fields.

Titanium powder is a very fine rocket fuel; titanium corrosion resistance, 15 times stronger than commonly used stainless steel, service life than stainless steel more than 10 times longer. Titanium in the application of surgical medical procedures, but also very fascinating. At present, the surgical bone is used stainless steel, the use of stainless steel has a disadvantage, that is, after the healing of the bone, the stainless steel piece to be taken out again, which is a very painful thing. Otherwise, stainless steel will be rusted and harmful to the human body. If the titanium "artificial bone" will make orthopedic technology completely changed. In the head of the damaged place, with titanium and titanium screws, after a few months, the bone will grow again in the titanium piece of small holes and screws, the new muscle fibers are wrapped in titanium on the sheet, titanium bones like real bones and flesh and blood, play a supportive and reinforcing role, so titanium has been praised as a "biophilic metal". Now it has begun to be used in the knee joint, shoulder joint, rib joints, skull, active heart valve, bone fixed clamps and so on.

In the steel industry, a small amount of titanium is a good deoxidizer, nitrogen and sulfur remover. Dioxide than titanium is a valuable white pigment called titanium white. Titanium white has both the masking performance of lead white and the lasting performance of zinc white, it is one of the whitest substances in the world, and titanium white is non-toxic. Now there are hundreds of thousands of tons of titanium dioxide used as pigment every year.

Because titanium dioxide has a high melting point, it is often used to make refractory glass, glaze, enamel, terra cotta, and high-temperature-resistant labware.

Titanium tetrachloride emits a lot of white smoke in wet air. Because it has this characteristic, it is commonly used in the military as an artificial smoke agent. Especially in the ocean, water vapor, a release of titanium tetrachloride, smoke is like a white Great Wall, blocking the enemy's line of sight.

Barium titanate crystals are widely used in ultrasonic instruments and underwater detectors. This is because with pressure chopping change shape, will produce current; once energized and will change shape. Put the barium titanate in the ultrasonic wave, it will be pressurized to produce current, by the size of the current it produces can be measured by the strength of the ultrasonic wave; on the contrary, with a high-frequency current through it, can produce ultrasonic waves.

In the use of gold to decorate crafts and daily necessities, due to their low hardness, easy to puncture and wear, can not be durable. When a layer of titanium nitride is plated on the surface of these substances, the appearance is almost exactly the same as gold plating, but it is more wear-resistant than gold and cemented carbide, and this plating is known as having "never-wearability".

Organic titanium polymers can be used as surfactants, dispersants, water-resistant agents or rust inhibitors.

Titanium is one of the four families of hydrogen storage metals currently used by humans, and it's also one of the cheaper ones, but humans have yet to find a more desirable "hydrogen storage metal," and once that problem is solved, people will be able to use hydrogen as a fuel.

Titanium planes can reduce their weight by 5 tons and carry more than 100 passengers. In the new jet engines, titanium alloy has accounted for 18 to 25% of the weight of the entire engine; in the latest emergence of supersonic airplanes, the use of titanium accounted for almost 95% of the total weight of the entire airframe structure, so without titanium alloy it is very difficult to develop the current supersonic aircraft.

Submarines made of titanium are not only more durable than steel submarines, but also can dive to greater depths, titanium submarines can dive to 4500 meters below, which is the boundary of the steel submarine can not be exceeded. Made of titanium warships, ships, without paint, sailing in the sea water for several years will not rust. Because titanium is not a ferromagnetic substance, will not be detected by magnetic mines, this point is particularly important in the military, if there is no titanium refined heat-resistant steel, the current use of conventional weapons rifles and machine guns can only be the initial life of 4.5 seconds.

Titanium and zirconium's powerful absorption of air can be utilized to remove air and create a vacuum. Vacuum pumps made from titanium and zirconium alloys can pump air down to just one part per billion.

Titanium-niobium alloys are ideal superconducting materials. Tsinghua University has made clear, layered ink paintings of mountains and rivers using optical interference principles and ionized titanium nitride treatment.

Of the two most common types of stainless steel in use today, chromium-nickel-titanium type 18-8-1 (containing 18% chromium, 8% nickel and 1% titanium) is the most commonly used in industry.

Titanium carbide (TiC) is rather like iron carbide, with a metallic luster. It has a higher melting point and higher hardness than iron carbide. Therefore, it has practical application value.

Titanium utensils with the preservation of food, color, aroma and taste of the long-lasting; titanium cookware is lightweight, and will not rust, the most scientific and hygienic.

Titanium alloy made of high-pressure containers, can withstand 2500 atmospheric pressure.

Titanium and nickel alloys are known as "memory alloys". This alloy is made into a pre-determined shape, and then after molding treatment, if deformed by external forces, it can be restored to its original form with a little heating. This kind of alloy has been applied in many fields. Such as the U.S. Apollo spacecraft antenna, is this memory alloy; Shanghai First Medical College Affiliated Ninth People's Hospital has been used in this memory alloy for women's sterilization surgery; in addition can also be used for instrumentation, electronic devices and other fields.

Now, the biggest obstacle to the widespread use of titanium is that titanium is very difficult to smelt. Because the melting point of titanium is very high, the smelting of titanium should be carried out at higher temperatures, and at high temperatures the chemical properties of titanium has become very active, so the smelting should be carried out under the protection of inert gases, but also do not use oxygen-containing materials, which puts forward a very high demand for smelting equipment, technology. Currently smelting of titanium about 70% used in the manufacture of aircraft, missiles, spaceships, satellites and so on.

Titanium metal's future is unlimited, so titanium was awarded the title of "21st century metal".

Titanium has been awarded the title "Metal of the 21st Century".