Spherical medical tantalum alloy powder, preparation method therefor and use thereof
The present disclosure provides a spherical medical tantalum alloy powder, a preparation method therefor and a use thereof, the preparation method comprising the following steps: S1. conducting preliminary plasma spheroidization on a pure tantalum powder to obtain a spherical pure tantalum powder; S2. mixing the spherical pure tantalum powder obtained from S1 with a pure copper particle and a pure silver particle, and then subjecting the mixture to a planetary ball milling to obtain a mixed metal powder; and S3. conducting plasma spheroidization on the mixed metal powder obtained in S2, and then sieving and filtering to obtain the spherical medical tantalum alloy powder. In the present disclosure, through the preparation method combining two-stage plasma spheroidization technology with planetary ball milling technology, the burnout of copper and silver can be reduced, and the spheroidization rate of the tantalum alloy powder can be further improved.
1. A method for preparing a spherical medical tantalum alloy powder, comprising the following steps:
S1. conducting preliminary plasma spheroidization on a pure tantalum powder to obtain a spherical pure tantalum powder;
S2. mixing the spherical pure tantalum powder obtained from S1 with a pure copper particle and a pure silver particle, and then subjecting the mixture to a planetary ball milling to obtain a mixed metal powder; and
S3. conducting plasma spheroidization on the mixed metal powder obtained in S2 such that a surface of the pure tantalum powder is coated with copper and silver, and then sieving and filtering to obtain the spherical medical tantalum alloy powder;
wherein process parameters for the preliminary plasma spheroidization in S1 and the plasma spheroidization in S3 are independently: a powder feed rate of 10-20 g·min −1 , a carrier gas flow rate of a protective gas of 5-15 L/min, a central gas flow rate of 15-25 L/min, a sheath gas flow rate of 50-80 L/min, a grid current of 0.2-0.6 A, a plate voltage of 5-15 kV, and a plate current of 2-6 A,
wherein the spherical medical tantalum alloy powder comprises: in weight percentage, 89-98.9% of Ta, 0.1-1% of Ag, and 1-10% of Cu.
2. The method for preparing the spherical medical tantalum alloy powder according to claim 1 , wherein a particle size of the pure tantalum powder in S1 is ≤200 μm.
3. The method for preparing the spherical medical tantalum alloy powder according to claim 1 , wherein process parameters for the preliminary plasma spheroidization in S1 and the plasma spheroidization in S3 are independent: the powder feed rate of 10 g·min −1 , the carrier gas flow rate of the protective gas of 15 L/min, the central gas flow rate of 20 L/min, the sheath gas flow rate of 65 L/min, the grid current of 0.3 A, the plate voltage of 5 kV, and the plate current of 2.5 A, wherein the protective gas, the central gas and the sheath gas are Ar.
4. The method for preparing the spherical medical tantalum alloy powder according to claim 1 , wherein a particle size of the pure copper particle in S2 is 10-100 nm; and a particle size of the pure silver particle is 10-100 nm.
5. The method for preparing the spherical medical tantalum alloy powder according to claim 1 , wherein a rotation speed of a main turntable for the planetary ball milling in S2 is 50-200 r/min, and a rotation speed of a ball milling jar is 50-400 r/min.