Molybdenum crucible refers to the process of deforming, cutting or forming molybdenum materials without heating or only slightly heating to obtain the required size, shape or surface accuracy. Since molybdenum has the characteristics of high strength, low plasticity and easy brittle fracture at room temperature, cold working is difficult, but it is very important for improving dimensional accuracy, finishing shape and repairing details, and is widely used in the post-processing stage of molybdenum crucible.
- Main cold working processes
- Cold Forging
Suitable for preforming of small-sized molybdenum crucibles;
Generally, mechanical punching machine or hydraulic press is used to cold press the mold under pressure;
the density and strength of the bottom or wall of the crucible;
However, the forming deformation needs to be strictly controlled to avoid micro cracks.
- Cold Rolling/Drawing
Mostly used for pre-processing of molybdenum tubes or molybdenum cylinders;
The ideal size can be obtained by gradually reducing the wall thickness and controlling the diameter;
Annealing is required in time after processing, otherwise the material will be too brittle to continue to deform.
- Machining
Turning, milling, drilling, boring, threading, etc.;
Used to form the flange, outer edge, mounting hole, positioning groove and other structures of the molybdenum crucible;
Carbide tools or diamond tools are required;
The cutting speed is low, the feed rate is moderate, and dry cutting or light lubrication is usually used.
- Grinding and polishing
Inner wall and outer surface finishing and precision improvement;
Use high temperature resistant abrasives such as aluminum oxide and silicon carbide;
Mirror polishing can be performed in situations where high precision is required (accuracy can reach Ra ≤ 0.2 μm);
It can be assisted by electrolytic polishing/ultrasonic polishing.
- Cold Spinning
Suitable for finishing of thin-walled molybdenum crucibles or head parts;
Complex geometric surfaces can be spun out by rollers at room temperature or slightly heated.
Processing should be slow and even to avoid cracked edges or wrinkles.
- Cold Straightening
Used to eliminate the warping and deformation of crucible after welding and sintering;
Use pressure correction, hydraulic shaping, vibration shaping and other methods;
It is often used in conjunction with nondestructive testing to ensure geometric accuracy and structural integrity.
- Difficulties and precautions of cold processing
| difficulty | reason | Countermeasures |
| Easy to crack | Molybdenum is brittle at room temperature. | Moderate preheating or annealing before processing |
| Fast tool wear | High hardness and high melting point | Select wear-resistant tools and control cutting parameters |
| Processed surface is easily scratched | Molybdenum surface is hard but brittle | Reduce feed and use fine-ground tools |
| High stress after deformation | Cold working accumulated stress | Annealing treatment is recommended after processing |
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