High Temperature Resistant Niobium Foil

Shaanxi Zhongheng Weichuang Metal Materials Co., Ltd. supplies high-quality rare metals, mainly including niobium hafnium alloy 103, tungsten, tantalum, niobium, hafnium, titanium, zirconium, nickel, vanadium and alloys of conventional processed profiles such as plates, strips, coils, rods, wires, pipes, as well as deep processed products such as ships, crucibles, sputtering targets, coating targets, machined parts, high-temperature furnace insulation screens, heating elements, furnace bodies (heating furnaces, annealing furnaces), corrosion-resistant equipment, etc.
As a manufacturer, supplier, and exporter of niobium materials, Shaanxi Zhongheng Weichuang Metal Materials Co., Ltd. provides high-purity, high-temperature resistant, corrosion-resistant, aerospace, defense, military, and marine engineering specialized products with worry free quality and more favorable prices! Customer service is always online, so you have no worries. 

Production workers and core production processes

 

 

01

Preparation of high-purity niobium matrix

The niobium raw material is purified to ≥ 99.95% by electron beam melting (EBM) or vacuum arc melting (VAR), and the impurity content such as oxygen (O<100ppm) and nitrogen (N<50ppm) is strictly controlled. The melted niobium ingot is forged and hot-rolled to form a slab with a thickness of 2-4mm, laying the foundation for subsequent ultra-thin rolling. The core of this stage is to ensure the initial purity and compositional uniformity of the material, and to avoid performance degradation caused by impurities during high-temperature service.

 

02

Precision rolling and annealing

Adopting a multi pass cold rolling process to gradually reduce the thickness of the foil material, with deformation controlled at 10% -15% per pass, and synchronously interspersing vacuum annealing (800-1000 ° C) to eliminate work hardening and refine grain size. Through precision roll control and lubrication technology, the final thickness can reach 0.03-0.5mm, with a tolerance accuracy of ± 0.002mm and a surface smoothness Ra ≤ 0.2 μ m. The key to this process is to balance the work hardening and recrystallization processes, ensuring that the foil material has both high strength and ductility.

 

03

Surface coating and functionalization

To enhance oxidation resistance, chemical vapor deposition (CVD) is used to prepare silicide coatings (such as NbSi ₂, MoSi ₂) on the surface of niobium foil, with a coating thickness of 10-30 μ m, increasing the oxidation resistance temperature from 600 ° C to 1400 ° C. For special applications (such as semiconductor devices), additional electrolytic polishing or anodizing treatment can be performed to reduce surface gas release rate and enhance corrosion resistance. The coating process requires precise control of temperature and atmosphere to avoid excessive oxidation of the substrate or cracking of the coating.

 

04

Performance testing and certification

The finished product needs to pass strict testing:
High temperature performance: 1400 ° C oxidation test (oxidation rate<0.1 g/m ² · h), creep resistance test (1000 ° C/100h);
Mechanical properties: tensile strength and fatigue life testing at room temperature and high temperature;
Non destructive testing: X-ray inspection for internal defects, eddy current testing for surface cracks.
The entire process must comply with aerospace (such as AMS 7852) or energy industry (such as ASTM B393) standards.

High temperature resistant niobium foil is coated with surface silicides (such as NbSi ₂, MoSi ₂) or alloyed (such as Nb-W-Zr series) to increase the oxidation resistance temperature from 600 ° C of pure niobium to 1200-1400 ° C, and maintain a tensile strength of ≥ 150 MPa at high temperatures. This characteristic makes it a core material for the heat shield of aerospace engine nozzles and the heat shield layer of re-entry chambers, capable of withstanding high-temperature gas erosion and aerodynamic heating; Simultaneously applied in the field of new energy, the molten salt stack insulation liner and solid oxide electrolysis cell (SOEC) connection plate work for a long time in a corrosive environment at 800 ° C.
The density of niobium foil is only 8.57 g/cm ³ (45% of tungsten), with a thermal conductivity of 53.7 W/m · K and a low thermal expansion coefficient (7.3 × 10 ⁻⁶/K). This feature is applicable to the multi-layer insulation blanket reflection layer of satellite thermal control systems, achieving dual functions of lightweight and thermal reflection; Used as a heat shield for annealing furnaces in semiconductor equipment to reduce the impact of thermal stress on wafer processes; It can also serve as a radiation heat sink for space nuclear power sources, improving the efficiency of thermoelectric conversion.
The dense oxide film (Nb ₂ O ₅) on the surface of niobium foil can resist acidic media and liquid metal corrosion, with an annual corrosion rate of<0.01 mm, a small neutron absorption cross section, and a radiation dose resistance of>5 dpa. This characteristic makes it suitable for the cladding of nuclear reactor monitoring components, which can withstand high temperature sodium corrosion and irradiation; As a lining for high-temperature reactors in chemical equipment to prevent strong acid infiltration; Suitable for electrode shielding of plasma etching equipment, resistant to fluorine based gas corrosion.
Niobium foil can be rolled to an ultra-thin thickness of 0.03 mm, supporting laser cutting, electron beam welding, and coating deposition, and is easy to process into complex shapes. This feature meets the customized requirements of medical implant devices, such as skull repair nets; Precision foil for ion thruster grid group, achieving lightweight thrust system; It can also serve as a substrate for superconducting cavity bundle foils, supporting the manufacturing of high-frequency cavities for particle accelerators.

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