Molybdenum Discs: High-Performance Metal-Ceramic Substrates for Precision Industry
Molybdenum discs, as a typical refractory metal thin material, are essentially high-performance metallic structural materials with quasi-ceramic properties. This product uses molybdenum powder with a purity of no less than 99.95% as the raw material, processed through multi-stage techniques into functional components in disc form with specific diameter-to-thickness ratios. Its core value lies in the organic integration of metallic toughness with ceramic high-temperature resistance, maintaining a high density of 10.2 g/cm³ while possessing an excellent combination of properties: a melting point of 2620°C, thermal conductivity of 150 W/(m·K), and a coefficient of thermal expansion of 5.5×10⁻⁶/K. This unique performance matrix makes it an irreplaceable material under extreme operating conditions.
Powder Metallurgy and Precision Forming Process System
Industrial production employs a complete technology chain based on powder metallurgy: first, high-purity molybdenum powder with controlled particle size distribution is obtained through airflow classification, and pre-formed blanks with a density gradient of less than 0.5% are prepared using bidirectional isostatic pressing. In a vertical high-temperature sintering furnace, the blanks undergo solid-phase sintering at 1850-2000°C in a hydrogen protective atmosphere, achieving grain boundary diffusion and pore closure. To exceed the theoretical density limit of the sintered body, subsequent multi-directional forging increases the material's relative density to over 99.2%, while establishing a uniform equiaxed grain structure with grain size controlled within the 30-50 μm range.
Plastic Processing and Microstructure Control Engineering
The cold-working characteristics of molybdenum necessitate a scientifically designed deformation-annealing schedule. During multi-pass warm rolling (400-600°C) on a reversible mill, the deformation per pass is strictly controlled within the 15-20% range. When the cumulative deformation reaches 60-70%, recrystallization annealing must be performed in a vacuum environment at 1250-1350°C to eliminate work hardening through texture reorganization. This cyclic process can reduce a 3mm thick plate to 0.1mm through 12-15 rolling cycles while maintaining a (100) plane texture strength ratio below 2.5.
Ultra-Precision Machining and Surface Engineering Technology
Sheets reaching the target thickness undergo double-sided grinding, progressively improving flatness to ≤5μm/100mm using stepwise decreasing diamond abrasives (from W40 to W1). For semiconductor-grade applications, chemical mechanical polishing (CMP) is added to achieve a surface roughness of Ra < 0.01μm. Precision wire cutting is performed using φ0.1mm molybdenum wire in a constant-temperature oil-based medium, with cutting accuracy reaching ±0.005mm. Terminal cleaning employs a combined three-stage ultrasonic and vacuum drying operation, with final vacuum packaging completed in a Class 100 cleanroom.
Critical Applications in High-End Equipment Manufacturing
In the field of integrated circuit manufacturing, molybdenum discs are primarily used in: 1) diffusion furnace heater arrays, requiring thermal deformation <0.1% per thousand hours at 1100°C; 2) carrier discs in PECVD equipment, which must withstand plasma erosion; 3) brazed substrates for high-power IGBT modules, requiring maintained thermal conductivity >130 W/(m·K). In the new energy sector, CIGS thin-film solar cells use 0.2mm molybdenum back electrodes, requiring surface oxygen content <200 ppm. In aerospace, they are processed into thrust chamber liners, maintaining structural integrity even in oxygen-rich environments at 1800°C.
Technological Evolution and Industry Development Trends
Facing the upgrade of the third-generation semiconductor industry, molybdenum disc technology is evolving in three dimensions: in terms of size, thermal insulation components for single-crystal silicon growth with diameters over 400mm have achieved batch production; in purity, electron beam melting purification technology can control potassium and sodium impurities below 1 ppm; in terms of compositing, Mo/AlN composite substrates developed through gradient coating technology are already used in 5G RF modules. With the maturation of atomic layer deposition (ALD) surface modification technology, molybdenum discs are expected to open new application scenarios in the field of wide-bandgap semiconductor epitaxial substrates in the future, continuously supporting the technological iteration of high-end manufacturing industries.
Molybdenum Disc is in demand in various parts of the world, such as: USA, Canada, Chile, Brazil, Argentina, Colombia, Germany, France, United Kingdom, Italy, Sweden, Austria, Netherlands, Belgium, Switzerland, Spain, Czech Republic, Poland.
As professional Chinese manufacturer, Mosten Alloy can produce and supply molybdenum electrode, molybdenum strip, molybdenum sheet, molybdenum pellet, molybdenum block, molybdenum tube, molybdenum rod, molybdenum wire, molybdenum processing workpiece according to customer demand.
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