Language
|
Parameter |
Specification |
|
Material |
Unalloyed Molybdenum (Pure Mo) |
|
Purity |
>= 99.95% Mo |
|
Density |
Approx. 10.2 g/cm3 |
|
Melting Point |
2620 C (4748 F) |
|
Thermal Expansion Coefficient |
Approx. 5.0 x 10^-6 /K (at room temperature) |
|
Available Finishes |
Machined, Chemically Cleaned, or Polished |
|
Operating Atmosphere |
Vacuum, Hydrogen (H2), or Inert Gas (Ar/He) only |
Crucial Operating Note: Molybdenum oxidizes rapidly above 400 C in oxygen-bearing atmospheres. Applications require high-vacuum systems or protective reduction/inert atmospheres.
Core Performance Advantages
High-Purity Composition (>= 99.95%)
Low impurity profiles prevent trace-element cross-contamination in sensitive production lines.
Controlled Interstitials: Minimized levels of carbon, oxygen, nitrogen, and iron.
Melt Stability: Prevents chemical interaction with molten rare earth metals and high-purity aluminum oxide (Al2O3).
Refractory Stability & Creep Resistance
With a melting point of 2620 C, molybdenum retains significant mechanical strength at elevated temperatures where conventional structural metals (such as stainless steel or nickel alloys) lose structural integrity, soften, or melt.
Dimensional Retention: Resists bottom sagging and wall deformation during extended multi-hour thermal runs.
Thermal Shock Resistance
Molybdenum's low thermal expansion coefficient (5.0 x 10^-6 /K) provides high dimensional stability across rapid heating and cooling cycles.
Cycle Durability: Lowers thermal stress gradients, minimizing micro-cracking and extending operational lifecycle during repeated furnace cycling.
Manufacturing & Production Processes
Powder Preparation & Forming: High-purity molybdenum powder is consolidated via cold isostatic pressing (CIP) and sintered at high temperatures to achieve target material density (approx. 10.2 g/cm3).
Machining & Forming: Depending on wall thickness and geometry, crucibles are produced via:
CNC Machining: For heavy-wall industrial and custom geometries directly from sintered billets or forged bars.
Deep Drawing & Spinning: For thin-walled, seamless small-to-medium crucibles.
Electron Beam / TIG Welding: For large-scale industrial vessels fabricated from rolled sheet.
Surface Treatment: Surface residues, tool marks, and organic contaminants are chemically cleaned to prepare the crucibles for vacuum integration.
Inspection: Dimensional verification (diameter, height, wall thickness tolerance) alongside visual and purity audits.
Primary Industrial Applications
Sapphire Crystal Growth: Used as growth containers in crystal pullers, providing chemical inertness against molten alumina at temperatures exceeding 2050 C.
Vacuum Evaporation & Coating: Acts as an evaporation boat or crucible liner for thin-film deposition and optical coating systems.
Semiconductor & Electronics: Utilized in high-temperature component sintering and zone-refining furnaces.
Rare Earth Melting: Processes reactive or high-melting-point rare earth elements without crucible-metal alloying degradation.
Laboratory Testing: Thermal analysis, high-temperature material synthesis, and high-vacuum experimental testing.
We supply standard configurations as well as engineered-to-order variants based on technical drawings or specific operational metrics (furnace type, max operating temperature, thermal profile).
Size Range
Small laboratory crucibles (few milliliters) to large industrial production crucibles (hundreds of liters).
Geometry Options
Cylindrical, round-bottom, flat-bottom, conical, and flanged designs.
Tolerances
Precision machined to tight dimensional tolerances to match specific susceptor or heater configurations.
As one of the most professional molybdenum crucibles manufacturers and suppliers in China, we warmly welcome you to buy OEM molybdenum crucibles from our factory. All custom made products are with high quality and competitive price. Contact us for quotation.
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