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Tantalum Good Performance
Aug 03, 2017

Tantalum has a series of excellent properties such as high melting point, low vapor pressure, good cold working performance, high chemical stability, strong resistance to liquid metal corrosion, large dielectric constant of surface oxide film and so on. Therefore, tantalum in electronic, metallurgical, steel, chemical, carbide, atomic energy, superconducting technology, automotive electronics, Tantalum aerospace, medical and scientific research and other high-tech fields have important applications.

50% to 70% of the world's tantalum is used in the form of capacitor grade tantalum powder and tantalum wire for tantalum capacitors. As the surface energy of tantalum to form a dense and stable, high dielectric strength of the amorphous oxide film, easy and accurate control of the capacitor anode oxidation process, while tantalum powder sintered block can be in a small volume to obtain a large surface area, Tantalum so tantalum Capacitors are widely used in communication (switches, mobile phones, pagers, Tantalum pagers, and so on), with high capacitance, low leakage current, low resistance, low temperature and low temperature, good service life, excellent performance, and other capacitors are difficult to match. Fax machines, etc.), computers, automobiles, home and office appliances, instrumentation, aerospace, defense and other industrial and technological sectors. Therefore, tantalum is a very versatile functional material.

Tantalum capacitors are made of rare metal tantalum, the first tantalum into fine powder, and then with other media made by sintering. The current process is dry powder molding and wet powder molding method two. Tantalum capacitors due to the inherent nature of metal tantalum, Tantalum with a stable good, does not change with the environment changes, can do a great value and other characteristics, in some areas with ceramic capacitors can not compare some of the features, so many can not use ceramic capacitors Tantalum capacitors are widely used.

Tantalum as alloying elements in the application of steel is still very small. Tantalum and steel in the interstitial atoms such as C, N and so have a high affinity, and they and the formation of compounds even at high temperatures are also very stable.

Tantalum is very hard texture, hardness can reach 6-6.5. Its melting point of up to 2996 ℃, second only to tungsten and rhenium, ranked third. Tantalum is ductile, can be pulled into filaments or made of thin foil. Its thermal expansion coefficient is very small, Tantalum each increased by one degree Celsius only expansion of 6.6 points per million. In addition, its toughness is stronger than copper. Tantalum also has a very good chemical properties, with high corrosion resistance. Whether in cold and hot conditions, hydrochloric acid, Tantalum concentrated nitric acid and "aqua regia" are no response. The tantalum into 200 ℃ sulfuric acid soak for one year, the surface damage only 0.006 mm. Experiments show that tantalum in the ordinary, the alkaline solution, chlorine, bromine, dilute sulfuric acid and many other agents do not work, only in the hydrofluoric acid and heat concentrated sulfuric acid under the reaction. This situation is relatively rare in the metal. Tantalum has the characteristics, so that its application is very broad. In the preparation of a variety of inorganic acid equipment, Tantalum tantalum can be used to replace stainless steel, life can be improved several times higher than stainless steel. In addition, in the chemical, electronics, electrical and other industries, tantalum can replace the past need to bear the task of precious metal platinum, so that the cost is greatly reduced.

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