Overview
Molybdenum discs are precision-engineered circular components made from pure molybdenum, a refractory metal valued for its extreme durability under harsh conditions. These discs are manufactured through powder metallurgy or vacuum arc-casting processes, followed by precision machining to achieve tight dimensional tolerances. Common diameters range from 10 mm to 300 mm, with thicknesses varying from 0.5 mm to 25 mm depending on application requirements. The material's unique combination of properties makes it indispensable in industries where other metals would fail, particularly in high-temperature or corrosive environments.
Structure and Working Principle
Molybdenum discs derive their functionality from the inherent properties of molybdenum's body-centered cubic (BCC) crystal structure. This atomic arrangement contributes to the metal's exceptional strength at elevated temperatures, maintaining structural integrity where most materials would soften or melt. In operation, the discs function as thermal and electrical conductors while resisting deformation. For sputtering applications, the flat surface allows uniform particle ejection when bombarded with ions in vacuum chambers. As furnace components, their low thermal expansion coefficient prevents warping during rapid temperature cycling.
Key Features
The standout characteristic of molybdenum discs is their remarkably high melting point of 2,623°C (4,753°F), the sixth-highest among all elemental metals. This enables operation in environments where steel or even tungsten would become impractical. Additional advantages include excellent thermal conductivity (138 W/m·K), low vapor pressure at high temperatures, and resistance to many molten metals and corrosive gases. The material maintains good electrical conductivity (34% IACS) while being significantly more affordable than precious metals like platinum or iridium.
Application Areas
In semiconductor manufacturing, molybdenum discs serve as crucial sputtering targets for depositing thin films in integrated circuit production. The electronics industry utilizes them as heat sinks and electrode materials in high-power devices. Industrial furnace systems employ these discs as heating elements, radiation shields, and crucible supports. Aerospace applications include rocket nozzle inserts and re-entry vehicle components. Emerging uses include medical imaging equipment and solar cell production, where purity and thermal stability are paramount.
Maintenance and Precautions
While molybdenum discs exhibit outstanding durability, proper handling extends their service life. At temperatures above 400°C in air, oxidation occurs—requiring protective atmospheres (hydrogen, argon) or coatings for prolonged high-temperature use. Storage should be in dry, contaminant-free environments to prevent surface oxidation. Cleaning should use non-chlorinated solvents to avoid pitting. For precision applications, avoid mechanical impacts that could create micro-fractures in the brittle material.
B2B Procurement Guide
When sourcing molybdenum discs, specify critical parameters: purity grade (standard 99.95% or high-purity 99.99%), dimensional tolerances, surface finish (machined, ground, or polished), and any required certifications (RoHS, REACH). Lead times can vary significantly—standard sizes may be available ex-stock, while custom diameters/thicknesses often require 4-8 weeks for production. Consider ordering from mills with in-house metallurgical labs to ensure consistent quality. For large-volume purchases (100+ discs), negotiate bulk pricing discounts of 15-30%.
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