Niobium zirconium alloy is irreplaceable in fields such as nuclear reactor cladding materials and aerospace propulsion components due to its high temperature strength, low neutron capture cross-section, and resistance to liquid metal corrosion. The following is a deep analysis of its mainstream preparation technology and key industrial parameters:

1、 Key technological breakthroughs in industrial production

1. Deep removal of impurities

Oxygen control: Application of solid deoxidizers in electron beam melting.

Slag gold reaction refining: Ca NaCl ₂ molten salt coverage reduces oxygen content to<80ppm.

Gap element removal: High temperature vacuum annealing treatment;

2. Homogenization treatment

Stable control of β phase: 1150 ℃/6h solid solution treatment → rapid helium cooling to avoid the precipitation of α - Zr brittle phase caused by Zr segregation;

2、 Cutting edge processes in additive manufacturing

1. Laser powder bed melting

Grain oriented growth: texture control achieved through scanning strategy;

Defect control: The molten pool monitoring system adjusts energy input in real-time;

2. Electron beam fuse deposition

Advantages of vacuum environment: Processing chamber oxygen partial pressure<0.1Pa ;

In situ heat treatment: Maintain interlayer temperature at 800 ℃.

3、 Production bottlenecks and solutions

Welding hot cracks: Zr segregation leads to grain boundary embrittlement, pulse laser welding+niobium foil intermediate layer;

High temperature oxidation: above 800 ℃, Nb ₂ O ₅ is generated and peeled off, with a surface silicide coating;

Radiation creep: Neutron irradiation induces dislocation loops and nano oxide dispersion strengthening.

4、 Progress of Industrialization in China

Western Superconductor: Achieving mass production of Φ 0.1 × 2000mm nuclear grade niobium zirconium alloy tubes;

Aerospace Materials Institute: Developed EBZM+multi-directional forging technology, with room temperature plasticity exceeding 30%;

Platinum Lite: Completed the hot test of 3D printed niobium zirconium alloy thrust chamber.