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钽是一种高熔点、低蒸汽压、膨胀系数小的稀有难熔金属材料。它的表面极易形成一层致密的氧化膜，具有良好的耐蚀性能。它在150℃下，具有良好的耐腐蚀性能，因此在硫酸、盐酸、硝酸及大多数有机强酸中是稳定的。它具有很高的强度和优良的加工性能，焊接性和热传导性良好，可作
Tantalum is a kind of rare refractory metal material with high melting point, low vapor pressure and small expansion coefficient. Its surface easily form a dense oxide film, has good corrosion resistance. It has good corrosion resistance at 150 ° C and is therefore stable in sulfuric acid, hydrochloric acid, nitric acid and most organic strong acids. It has a high strength and excellent processing properties, good weldability and thermal conductivity, can be used