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Titanium Raw Materials Rare Metal
Aug 22, 2017

Titanium is a chemical element, chemical symbol Ti, atomic number 22, in the periodic table of chemical elements in the fourth cycle, Group IVB. Is a silver-white transition metal, which is characterized by light weight, high strength, with metallic luster, moisture-resistant chlorine corrosion. But titanium can not be used in dry chlorine, even if the temperature below 0 ℃ dry chlorine, there will be a violent chemical reaction, the formation of titanium tetrachloride, and then decomposition of titanium dioxide, or even combustion. Only when the moisture content of chlorine gas is higher than 0.5%, titanium in which to maintain a reliable stability.

Titanium is considered to be a rare metal, due to its dispersion in nature and difficult to extract. But its relatively rich, in all the elements in the tenth place. Titanium ore mainly ilmenite and rutile, widely distributed in the crust and lithosphere. Titanium is also present in almost all creatures, rocks, water bodies and soil. Extraction of titanium from the main ore requires the use of the Crow method or the Hunt method. The most common compound of titanium is titanium dioxide, which can be used to make white pigments. Other compounds include titanium tetrachloride (TiCl4) (as a catalyst and for the manufacture of smoke screens for aerial cover) and titanium trichloride (TiCl3) (for the production of catalyzed polypropylene).

Physical properties: Titanium with metallic luster, with ductility. Density of 4.5 g / cm3. Melting point 1660 ± 10 ℃. The boiling point of 3287 ℃. Valence + 2, + 3 and +4. The ionization energy is 6.82 eV. Titanium is characterized by a small density, mechanical strength, easy processing. The plasticity of titanium is mainly dependent on purity. Titanium more pure, the greater the plasticity. Has good corrosion resistance, not affected by the atmosphere and sea water. At room temperature, will not be less than 7% hydrochloric acid, 5% sulfuric acid, nitric acid, aqua regia or dilute alkali solution corrosion; only hydrofluoric acid, concentrated hydrochloric acid, concentrated sulfuric acid, etc. can it.

Titanium is an important alloying element in steel and alloys. Titanium has a density of 4.506-4.516 g / cm (20 ° C) higher than aluminum and lower than iron, copper and nickel. But the intensity is at the head of the metal. [8] Melting point 1668 ± 4 ℃, melting latent heat 3.7-5.0 kcal / gram atom, boiling point 3260 ± 20 ℃, latent heat of vaporization 102.5-112.5 kcal / gram atom, critical temperature 4350 ℃, critical pressure 1130 atmospheric pressure. Titanium thermal conductivity and conductivity is poor, similar or slightly lower than the stainless steel, titanium with superconductivity, titanium superconducting critical temperature of 0.38-0.4K. At 25 ° C, the heat capacity of titanium is 0.126 cal / g [9] atoms, degree of enthalpy of 1149 cards / gram atom, entropy of 7.33 cals per gram atom, metal titanium is paramagnetic material with a permeability of 1.00004 The

Titanium has plasticity, high purity titanium elongation of up to 50-60%, section shrinkage up to 70-80%, but the shrinkage strength is low (that is, the intensity of contraction). Titanium impurities in the existence of its mechanical properties of great impact, especially the gap impurities (oxygen, nitrogen, carbon) can greatly improve the strength of titanium, significantly reduce its plasticity. Titanium as a structural material has good mechanical properties, that is, by strictly controlling the appropriate impurity content and adding alloying elements to achieve.

Barium titanate crystals have such a characteristic that when they are subjected to pressure to change the shape, a current is generated and a power is changed to change the shape. Thus, people put barium titanate in the ultrasonic wave, it will produce a current pressure, the size of the current generated by it can be measured the strength of ultrasound. On the contrary, with high frequency current through it, you can produce ultrasound. Almost all of the ultrasonic equipment, have to use barium titanate. In addition, barium titanate has many uses. For example: the railway workers put it under the rail, to measure the pressure when the train through; doctors use it to make pulse recorder. The underwater probe made of barium titanate is a sharp underwater eye that can not only see the fish, but also the submarines under the water, the icebergs and the enemy's submarines.

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