Molybdenum wire is a special metal wire material made from molybdenum as the core raw material through powder metallurgy, forging, drawing and other processes. With its characteristics of high melting point, high strength and low thermal expansion coefficient, it is widely used in wire cutting, high-temperature heating, electronics industry and other fields, serving as a key material for industrial precision manufacturing and high-temperature working conditions. The following is a detailed introduction from the aspects of core characteristics, classification, production process, application and selection points.
Wire-cutting molybdenum wire: With a diameter of 0.12–0.20 mm, it is used for electrical discharge wire cutting (EDWC) to cut conductive materials such as steel, aluminum and titanium.
High-temperature molybdenum wire: Heat-resistant, it is applied in furnace heating elements and aerospace components.
Spraying molybdenum wire: It is used for preparing wear-resistant coatings for auto piston rings, transmission synchronizer components and other parts.
Electronic molybdenum wire: It is adopted in grid wires and lead-out wires of vacuum electronic devices and electric light sources.
With its properties of high melting point, high strength, low thermal expansion coefficient and excellent electrical & thermal conductivity, molybdenum wire plays an irreplaceable role in fields such as precision manufacturing, high-temperature industry, electronics & electric light sources, and surface engineering. Different types of molybdenum wire correspond to differentiated core application scenarios, which are specifically classified as follows:
This is the most mainstream application scenario of molybdenum wire. Specialized molybdenum wire for wire cutting (with a diameter of 0.12–0.20 mm) is the core material, which is compatible with high-speed and medium-speed wire cutting machines. It serves as the electrode wire for precision machining of conductive materials including steel, aluminum, titanium alloy and die steel.
Its technical advantages lie in narrow wire diameter tolerance (±0.002 mm) and high tensile strength, with the cutting precision reaching ±0.005 mm. It can process complex mold cavities, precision auto parts, and special-shaped aerospace components, and is widely used in the mold manufacturing and mechanical processing industries.
High-temperature molybdenum wire (mostly La- or Y-doped type) can withstand high temperatures of 1700–1800℃. In inert atmospheres such as vacuum and hydrogen, it can be used as the heating element of vacuum sintering furnaces, crystal growth furnaces and heat treatment furnaces, and is often processed into spiral or frame structures for use.
Meanwhile, it can also be made into thermocouple electrodes for temperature measurement under high-temperature working conditions, adapting to high-temperature equipment in industries such as metallurgy, ceramic sintering and monocrystalline silicon manufacturing.
Electronic molybdenum wire features high purity (≥99.95%) and stable electrical conductivity, and is a core raw material for vacuum electronic devices and electric light source products:
It is used in the filaments and brackets of incandescent lamps and halogen lamps. Taking advantage of its high melting point and low evaporation rate, it extends the service life of lamps;
It is made into grid wires and lead-out wires of electron tubes and picture tubes, ensuring the stability of signal transmission of electronic devices, and serving the electronic component manufacturing industry.
Through thermal spraying processes (flame spraying, plasma spraying), spraying molybdenum wire can form a wear-resistant coating on the metal surface, improving the hardness and wear resistance of components.
Typical applications include surface strengthening of parts such as auto piston rings, transmission synchronizers and construction machinery hydraulic rods. The coating hardness can reach above HV1000, which can extend the wear-resistant service life of parts by 3–5 times.
Due to its high high-temperature strength and excellent creep resistance, doped molybdenum wire can be used in high-temperature components of aero-engines, reinforcing fibers of satellite structural parts, and high-temperature resistant components of rocket engine nozzles, adapting to the extreme working condition requirements of the aerospace field.
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