Preparation of Low Oxygen Nickel Lanthanum Alloy by Hydrogen Plasma Arc Melting and Applied Research
The effects of melting parameters and lanthanum content on the oxygen content of Ni-La alloy prepared by plasma melting were investigated.The results show that the addition of H2 in the melting atmosphere is more conducive to the removal of O of the alloy,and the active hydrogen plasma impinges on the molten metal with the gas molten reactions to achieve the purpose of deep removal of O.The rate of deoxidation increases as the hydrogen content increasing.After the Ar+14％H2 plasma arc refining for 15 min,the oxygen content of the sample decrease to 9 × 10-6,and the deoxidation rate reach 96.25％.The deoxidation rate of Ni-La alloy with different La enhance with the growth of H2 contained in plasma gas.The low oxygen rare earth alloy was added to CMSX-4 alloy to prepare rare earth single crystal alloy.The oxidation experiment of superalloy was carried out at 1000 ℃.The results show that rare earth La can effectively improve the oxidation resistance of CMSX-4 alloy.
万方数据
维普
