Niobium Cup Crucibles

Niobium Cup is usually made of high-purity metal niobium (Nb). Due to its high temperature resistance, corrosion resistance, superconductivity and other characteristics, it is often used in aerospace, electronics, medical and high-end scientific research equipment. The following is a typical production process of niobium cup, which mainly includes key links such as raw material preparation, forming processing, heat treatment, surface treatment and testing:
Raw material preparation
Niobium ingots prepared by electron beam melting or vacuum arc melting are selected as raw materials and rolled into foil plates for standby use.
According to the size of the cup, the niobium plate is cut into round or rectangular billets. The oxide scale is removed by pickling, and the surface is cleaned by mechanical polishing.

 

 

According to the shape, size and precision requirements of the niobium cup, choose the following forming methods:
a. Stamping (applicable to small and medium-sized cups)
Blanking: Use a die to punch the niobium plate into a round blank (cup bottom diameter).
Drawing: The blank is gradually stretched into a cup shape through multi-stage stretching. The drawing coefficient needs to be controlled (to avoid cracking), and lubricants (such as graphite emulsion) are often used to reduce friction.
Trimming: Cut off excess material at the mouth of the cup to ensure high dimensional accuracy.
Equipment: Hydraulic punching machine, precision mold (made of carbide or tool steel).
Applicable scenarios: Batch production of simple niobium cups (such as laboratory crucibles and small containers).
b. Spinning (applicable to rotationally symmetrical cups)
Fix the niobium plate to the rotating core mold, and extrude the material along the core mold trajectory through the spinning wheel to gradually fit the mold.
A deep cylindrical cup can be formed at one time, or the wall thickness and shape can be adjusted through multiple spinning.
Advantages: Low mold cost, suitable for small batches and large-size cups (such as containers with a diameter of >300mm).
Equipment: CNC spinning machine, which needs to control the rotation speed, spinning pressure and feed rate.

a. Heat treatment
Annealing: The formed niobium cup may be work hardened and needs to be vacuum annealed at 800~1000℃ for 1~2 hours to restore plasticity and eliminate stress.
Aging treatment (if strengthening is required): For the niobium alloy cup body with added alloy elements, the strength is improved by aging.
b. Surface treatment
Polishing: Mechanical polishing (sandpaper/abrasive paste) or electrolytic polishing (such as sulfuric acid + methanol electrolyte) to make the surface roughness Ra≤0.8μm (optical grade applications require Ra≤0.2μm).
Coating: Nickel plating, gold plating (to improve corrosion resistance or conductivity), or ceramic coating (high temperature wear resistance) can be selected according to the purpose.
Cleaning: Ultrasonic cleaning to remove oil and metal debris, medical-grade products need to be sterilized.

niobium cups

Niobium crucible

Scientific research and industry: niobium crucibles for high-temperature smelting (resistant to molten metal corrosion above 1600℃), chemical reaction vessels (resistant to strong acids and alkalis).
Aerospace: engine combustion chamber components (resistant to high-pressure and high-temperature gas scouring), rocket nozzles (niobium alloy anti-oxidation coating).
Medical equipment: implantable device components (niobium has better biocompatibility than titanium alloys and requires high-purity surface treatment).
High-end utensils: corrosion-resistant wine utensils, art collections (using niobium's anti-oxidation and metallic luster).

As high-value-added metal products, niobium cups need to be shockproof, moisture-proof, anti-oxidation and corrosion-resistant, and meet international transportation standards for export packaging, while considering the customs requirements and transportation methods (sea, air, and land) of different countries.
Inner packaging:
Vacuum packaging bags: use aluminum foil composite film or nylon vacuum bags, vacuumize and seal to isolate air and water vapor.

niobium cups

Carton packaging

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