The purpose of the titanium

Titanium is a transition metal and has been considered a rare metal for some time. Since the 1940s, titanium and its compounds have been widely used in aircraft, rockets, missiles, satellites, spacecraft, ships, military, medical and petrochemical fields. Because titanium has high melting point, hardness, plasticity, low density, corrosion resistance and other advantages; Titanium looks like steel and has a silver - gray light translation. Titanium has great strength, and the tensile strength of titanium alloy is 180kg/mm3. Titanium is characterized by low density (4.51g/cm3), high hardness, high melting point (1675℃), high purity titanium has good plasticity, but becomes brittle and hard in the presence of impurities. At room temperature, titanium does not react with chlorine, dilute sulfuric acid, dilute hydrochloric acid and nitric acid, but can be attacked by hydrofluoric acid, phosphoric acid and molten alkali. Titanium is easily dissolved in H2SO4. The most outstanding property of titanium is its strong corrosion resistance to seawater. Titanium accounts for about 0.42% of the total weight in the earth's crust, ranking seventh in the metal world, with more than 70 kinds of titanium minerals. At present, titanium has been widely used in aircraft, rockets, missiles, satellites, spacecraft, ships, military, light industry, chemical, textile, medical and petrochemical fields.

Very fine titanium powder, is a good rocket fuel; The corrosion resistance of titanium is 15 times stronger than commonly used stainless steel, and the service life is more than 10 times longer than stainless steel. The application of titanium in medical surgery is also very interesting. At present, stainless steel is used in surgical osteosynthesis. One disadvantage of using stainless steel is that it is very painful to remove the stainless steel sheet after the bone is healed. Otherwise, stainless steel will cause harm to human body because of rust. If the use of titanium "artificial bone" will make a complete transformation of orthopedic technology. At the head of the damage, using titanium plate with titanium screws, after several months, bones will grow back in titanium plate holes and screw, new muscle fibers are wrapped in titanium sheet, titanium skeleton like a real bones and flesh of support and reinforcement effect, so, titanium has been hailed as "metal". Now it has been applied to knee joint, shoulder joint, rib joint, cranium, active valve, bone fixation clip and so on.

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