Tantalum wire is a type of wire-like tantalum material made from tantalum powder through plastic processing methods such as rolling and drawing.
The process of manufacturing tantalum wires is as follows: raw materials (tantalum powder) → mixing → forming → vertical melting → spinning forging → intermediate annealing → drawing → final annealing → quality inspection → packaging and storage.
Tantalum possesses a series of outstanding properties such as high melting point, low vapor pressure, good cold working performance, high chemical stability, strong resistance to liquid metal corrosion, and a large dielectric constant of the surface oxide film. Therefore, tantalum has important applications in high-tech fields such as electronics, metallurgy, steel, chemical industry, hard alloys, atomic energy, superconductivity technology, automotive electronics, aerospace, medical care, and scientific research, and is a highly versatile functional material.
50% to 70% of the world's tantalum is used in the form of capacitor-grade tantalum powder and tantalum wires to manufacture tantalum capacitors. Because the surface of tantalum can form a dense and stable amorphous oxide film with high dielectric strength, it is easy to accurately and conveniently control the anodic oxidation process of the capacitors. At the same time, the tantalum powder sintered blocks can obtain a large surface area in a very small volume. Therefore, tantalum capacitors have high capacitance, low leakage current, low equivalent series resistance, good high and low temperature characteristics, long service life, excellent comprehensive performance, and are difficult to be matched with other capacitors. It is widely used in industries and technologies such as communications (switches, mobile phones, pagers, fax machines, etc.), computers, automobiles, household and office appliances, instruments and meters, aerospace, national defense and military industries.
Tantalum wires are widely used in the electronics industry, mainly as the anode leads of tantalum electrolytic capacitors. Tantalum wires are also used in the electronics industry to manufacture rectifiers and capacitors. Other applications include medical equipment, chemical processing and lighting applications. Regardless of the temperature conditions, in hydrochloric acid, concentrated nitric acid， tantalum wires do not undergo chemical reactions. In medicine， tantalum is used to manufacture thin sheets or sutures to repair damaged tissues.
Raw material control (purity and composition): High-purity tantalum powder: Tantalum wires are usually manufactured by powder metallurgy methods (isostatic pressing, vacuum sintering) into tantalum rods. It is essential to ensure that the purity of the raw tantalum powder is extremely high. Impurity control: The content of interstitial impurities such as carbon, oxygen, nitrogen, and hydrogen must be strictly controlled. These impurities directly affect the ductility of the tantalum wire and the subsequent drawing performance. Doping requirements: If specific performance is required (such as controlling the tensile strength fluctuation within 40 MPa), precise solid-state doping such as doping with silicon is necessary. Key steps in processing: Sintering and vacuum: The sintering process must be carried out under high vacuum conditions to ensure the densification of the tantalum rods and the removal of gas impurities. Cold processing/drawing: Tantalum has good cold processing properties, but during the drawing process, a special lubricant must be used to reduce mold wear and maintain the surface quality of the wire.
Multiple annealing: During the drawing process, multiple annealing treatments are required to eliminate work hardening and ensure that the wire has the required plasticity.
Cleaning and surface treatment: After drawing, acid washing and water washing are required to remove surface oils and impurities, ensuring a clean surface.
