A kind of preparation method of nb-si-ti alloy with directionally solidified structure
A technology of nb-si-ti and directional solidification, which is applied in the field of preparation of high-temperature structural materials, can solve problems such as difficulty in guaranteeing mechanical properties and coarse structure of Nb-Si-based alloys, so as to improve room temperature fracture toughness, improve comprehensive mechanical properties, The effect of eliminating component segregation
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[0034] A kind of preparation method of Nb-18Si-23Ti alloy with directionally solidified structure:
[0035] (1) Sieve commercially available pure Nb powder, pure Si powder and pure Ti powder through a metal sieve to obtain pure Nb powder, pure Si powder and pure Ti powder with an average particle size of about 80 μm.
[0036] (2) According to the composition of the Nb-18Si-23Ti alloy in atomic percentage, the 80 μm pure Nb powder, pure Si powder and pure Ti powder obtained in step (1) were mixed. A planetary ball mill was used to mix for 2 hours, and no balls were added during the mixing process.
[0037] (3) Put the mixed powder of Nb, Si and Ti in the powder feeder of the laser rapid prototyping system, and adopt the powder feeding head coaxial with the laser beam. Use high-purity argon as the powder feeding airflow, set the powder-carrying airflow as: 8L / min, use argon as the protective gas, and the protective gas flow rate as: 20L / min.
[0038](4) The directionally solid...
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