What Is Molybdenum Wire
Molybdenum wire is a refined molybdenum rod drawn into fine wire. Molybdenum is a refractory metal with a melting point of about 2623 degrees C, high strength at elevated temperatures, good electrical and thermal conductivity, and low thermal expansion. These properties make molybdenum wire the standard material for high-temperature hot fields such as molybdenum furnace heating elements and electron tube supports.
Types of Molybdenum Wire
Molybdenum wire is divided into several types by surface condition and application: white molybdenum wire with a cleaned, bright surface; black molybdenum wire with the as-drawn oxide surface; spray-coated molybdenum wire used for thermal spraying; and wire-cutting molybdenum wire, a precision-drawn grade with controlled diameter and tensile strength for electrical discharge machining.
Production Process
Molybdenum wire starts from molybdenum powder pressed and sintered into ingots, which are forged and rolled into rods. The rods are drawn through progressively smaller dies, with intermediate annealing to restore ductility, until the required diameter is reached. The drawn wire is cleaned, inspected for diameter uniformity and surface defects, and wound onto spools.
High-Temperature Applications
Molybdenum wire is often used as a heating material for high-temperature furnaces, where it operates in protective atmospheres or vacuum at temperatures up to about 1800 degrees C, and as heating wire mesh for bracket materials and furnace components. It is used for lamp filament supports, electron tube grids and heaters, and as thermocouple sheathing and electrode material in glass and quartz processing.
Wire-Cut EDM Use
Molybdenum wire is a standard electrode wire for wire-cut electrical discharge machining, where the wire erodes the workpiece by spark discharge along a programmed path. Its high melting point and tensile strength allow long continuous cutting with minimal breakage, and its conductivity supports efficient material removal. Wire diameters commonly range from 0.10 to 0.30 mm.
Frequently Asked Questions
Q: What is molybdenum wire?
A: Wire drawn from refined molybdenum rods, used for high-temperature and wire-cutting applications.
Q: What are the main types?
A: White, black, spray-coated, and wire-cutting molybdenum wire.
Q: What temperature can it withstand?
A: Furnace heating elements operate up to about 1800 degrees C in protective atmospheres or vacuum.
Q: Why is it used in wire-cut EDM?
A: High melting point, tensile strength, and conductivity support long, stable cutting.
Q: What diameters are used for EDM?
A: Commonly 0.10 to 0.30 mm.
Q: Where else is it used?
A: Lamp supports, electron tube components, and furnace heating mesh.
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