GB/T 38975-2020 in English

Core technical requirements of the standard

Material properties and preparation process

The standard stipulates four mainstream preparation processes, including plasma rotating electrode method and plasma atomization method. Among them, TaNb3 grade requires niobium content of 1.5-3.5%, and oxygen content is strictly controlled at ≤0.025%, which is particularly suitable for the manufacture of high-temperature corrosion-resistant parts.

Key points of quality control

• Chemical composition testing is based on GB/T 15076 series standards
• Particle size distribution testing must meet both GB/T 1480 screening method and GB/T 19077 laser diffraction method
• Special indicators such as hollow powder rate need to be determined by negotiation between the supply and demand parties

Application case of aircraft engine blades

A certain type of aircraft turbine blade uses Ta2 powder and is formed by selective laser melting process. After testing:

• High temperature strength reaches 1200MPa@1000℃
• Oxidation weight gain rate <0.5mg/cm²·h
• Fatigue life is increased by 300%
compared with traditional casting process

Implementation suggestions

1. The storage environment needs to maintain a relative humidity of <40%
2. Vacuum drying should be performed at 150°C before use
3. It is recommended to use an argon protection system for printing