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, 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, so tantalum Capacitors are widely used in communication (switches, mobile phones, pagers, 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, 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.
At present, the world has the following brands of tantalum capacitors: AVX, KEMET, VISHAY, NEC, AVX and VISHAY which the largest output, and the best quality.
Advantages and Disadvantages of Tantalum Capacitors
Solid tantalum capacitors with excellent electrical performance, wide operating temperature range, and in various forms, excellent volume efficiency
Application of Tantalum in Alloy
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.
The effect of tantalum on the strengthening of Fe-C-Ta alloy and the related mechanism were studied by mechanical properties test and OM, SEM and TEM observation of the Institute of Metal Research, Chinese Academy of Sciences. The results show that the tantalum content increases from 0.027% to 0.059%, the strength of the alloy is greatly improved, the impact energy of the high tantalum content alloy is reduced by 87J, but still has good toughness. The results show that the strengthening effect of tantalum in iron-based alloy is solid solution strengthening and precipitation strengthening, and the strength and plasticity of the high tantalum content alloy at 600 ℃ for 1h reach the maximum value, and the best tantalum carbide Of the precipitation to strengthen the effect.
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