Niobium Crucible

Niobium Crucible Data Sheet

Reference:	HMNB1101
Dimensions:	Customized
Standard:	ASTM B394
Material:	R04200, R04210, R04251, R04261, R04295
Type:	Stamping, Machining, Sintering, and Welding
Shape:	Cylinder, Conical, Square, or customized
Surface:	Polished, Vannum Annealed, Cold-rolled Bringht
Purity:	99.5%-99.99%
Temper:	Annealed or Unannealed

Niobium Crucible

Niobium Crucible, also called niobium cup, is manufactured by high-purity niobium metal, which exhibits excellent corrosion resistance and high strength at high temperatures. They are widely used in rare earth smelting, high-temperature sintering, special glass melting, and corrosion-resistant vessels in the chemical industry. Shanghai Yuepeng can supply high-quality niobium crucibles with a wide range of specifications. The customized solutions are available according to specific requirements.

Niobium Crucible Material Chemical Composition

Material	Main Element (%)	Impurities (≤%)
	Nb	Fe	Si	Ni	W	Mo	Ti	Ta	Zr	Hf	O	C	H	N
RO4200	Bal.	0.0040	0.0040	0.0020	0.0050	0.0050	0.0020	0.0700	0.0200	0.0200	0.0150	0.0040	0.0015	0.0030
RO4210	Bal.	0.0100	0.0100	0.0050	0.0200	0.0100	0.0040	0.1000	0.0200	0.0200	0.0200	0.0100	0.0015	0.0100
RO4251	Bal.	0.0050	0.0050	0.0050	0.0300	0.0100	0.0200	0.1000	0.8-1.2	0.0200	0.0150	0.0100	0.0015	0.0100
RO4261	Bal.	0.0500	0.0050	0.0050	0.0500	0.0500	0.0300	0.5000	0.8-1.2	0.0200	0.0250	0.0100	0.0015	0.0100
R04220	Bal.	0.0050	0.0050	0.0030	0.0070	—	0.0050	0.1000	0.0100	—	0.0040	0.0030	0.0005	0.0030
RO4295	Bal.	—	—	—	0.5000	—	0.7-1.3	0.5000	0.700	9-11	0.0250	0.0150	0.0015	0.0100

Niobium Crucible Mechanical Properties of Annealed Condition

Grade	Tensile strength psi(MPa), ≥	Yield strength δ0.2, psi (MPa),≥	Elongation in 1″/2″ gage length, %, ≥
			>=0.010	<0.010
R04200, R04210	18000 (125)	10500 (73)	20	15
R04251, R04261	28000 (195)	18000 (125)	20	15
R04220 (RRR Grade)	14000 (95)	7200 (50)	30	30

Niobium Crucible Processing Method

Niobium crucibles can be classified into four types according to the processing methods, including stamping, machining, sintering, and welding. The detailed processes are as follows:

• Material Selection and Purification: High-purity niobium (99.9%+) is selected, and impurities are removed using methods like vacuum arc remelting (VAR).
• Melting and Casting: Niobium is melted in a vacuum arc furnace and then cast into ingots or billets for further processing.
• Hot Working: The niobium is forged or extruded into semi-finished shapes like discs or rods to improve grain structure and shape.
• Shaping and Forming: Niobium is stamped, pressed, or deep-drawn into crucible shapes, followed by machining for precise dimensions.
• Heat Treatment: Annealing or vacuum heat treatment is performed to relieve stresses and enhance strength and corrosion resistance.
• Surface Finishing: Grinding, polishing, and coating (if needed) are done to achieve a smooth surface and improve durability.

Niobium Crucible Applications

• Rare Earth Smelting: Niobium crucibles are able to withstand high temperatures and corrosive environments, making them ideal for use in the smelting process of rare earth metals.
• High-temperature Sintering: Niobium crucibles are used for sintering ceramics, metal powders, and other materials in high-temperature sintering processes.
• Chemical Industry: Niobium crucibles are used as chemical-resistant containers for handling strong acids, alkalis, and other corrosive chemicals.
• Sputtering and Evaporation: Niobium crucibles are used for sputtering and evaporating materials in the physical vapor deposition (PVD) process to prepare thin films.

Niobium Crucible Packaging

The Niobium Crucible is carefully placed in wooden cases or cartons with additional support from soft materials to prevent any shifting during transportation. This packaging method guarantees the integrity of the products throughout the delivery process.