Forging is suitable for high-precision, high-strength crucibles, commonly used in semiconductor and precious metal smelting.
step:
Raw material preparation
Select molybdenum billet: Use high-purity molybdenum rods or molybdenum plates (purity ≥ 99.95%), which are made by powder metallurgy sintering and forging/rolling, and the density is close to the theoretical value.
Quality control: Check the chemical composition, density and internal defects (such as cracks and inclusions) of the blank.
Pretreatment of blanks
Cutting: Cut molybdenum rods or plates into sizes suitable for processing.
Heating: Preheat the blank in an inert atmosphere or vacuum furnace at 1200-1500°C to increase ductility and reduce work hardening.
Forging or machining
shaped into the shape of a crucible through forging, extrusion or rotary forging.
Finishing: Use CNC lathes, milling machines or grinders to precisely process the inner and outer surfaces, wall thickness and bottom of the crucible to ensure high dimensional accuracy.
Process environment: Oxidation should be avoided during processing and it should be carried out under inert atmosphere if necessary.
Heat treatment (annealing)
Annealing at 800-1200°C in vacuum or hydrogen atmosphere for 1-2 hours can eliminate processing stress, improve crystal structure and enhance toughness.
Cool slowly to avoid thermal stress.
Surface treatment
Polishing: Mechanically or chemically polish the inner surface to improve finish and corrosion resistance.
Coating (optional): Apply an anti-oxidation coating (such as ZrO ₂) to extend high temperature life.
Cleaning: Use pickling or ultrasonic cleaning to remove impurities such as oil, oxides, etc.
Quality Inspection
Dimensions and Appearance: Check the crucible dimensions, surface finish and geometry.
Performance tests: Density (~10.2 g/cm³), hardness, microstructure and impurity content.
Nondestructive testing: Use ultrasound or X-rays to check for internal defects.
High temperature simulation (optional): Verify the mechanical and chemical stability of the crucible at high temperatures.
Packaging and storage
Same as sintered crucible, in anti-oxidation packaging, stored in a dry environment.
======================================================================
Customized R&D and Production of Tungsten, Molybdenum Products
Chinatungsten Online and CTIA GROUP LTD have been working in the tungsten industry for nearly 30 years, specializing in flexible customization of tungsten and molybdenum products worldwide, which are tungsten and molybdenum design, R&D, production, and overall solution integrators with high visibility and credibility worldwide.
Chinatungsten Online and CTIA GROUP LTD provide products mainly including: tungsten oxide products, such as tungstates such as APT/WO3; tungsten powder and tungsten carbide powder; tungsten metal products such as tungsten wire, tungsten ball, tungsten bar, tungsten electrode, etc.; high-density alloy products, such as dart rods, fishing sinkers, automotive tungsten crankshaft counterweights, mobile phones, clocks and watches, tungsten alloy shielding materials for radioactive medical equipment, etc.; tungsten silver and tungsten copper products for electronic appliances. Cemented carbide products include cutting tools such as cutting, grinding, milling, drilling, planing, wear-resistant parts, nozzles, spheres, anti-skid spikes, molds, structural parts, seals, bearings, high-pressure and high-temperature resistant cavities, top hammers, and other standard and customized high-hardness, high-strength, strong acid and alkali resistant high-performance products. Molybdenum products include molybdenum oxide, molybdenum powder, molybdenum and alloy sintering materials, molybdenum crucibles, molybdenum boats, TZM, TZC, molybdenum wires, molybdenum heating belts, molybdenum spouts, molybdenum copper, molybdenum tungsten alloys, molybdenum sputtering targets, sapphire single crystal furnace components, etc.
If you are interested in related products, please contact us:
Email: sales@chinatungsten.com
Tel: +86 592 5129696 / 86 592 5129595
