Preparation of spherical titanium-tantalum alloy powder for additive manufacturing by radio frequency plasma

Ying Zhenhong; Tan Chong; Shi Qi; Li Guifa; Zheng Haizhong; Liu Xin

doi:10.7513/j.issn.1004-7638.2021.03.010

Volume 42 Issue 3

Jun. 2021

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Ying Zhenhong, Tan Chong, Shi Qi, Li Guifa, Zheng Haizhong, Liu Xin. Preparation of spherical titanium-tantalum alloy powder for additive manufacturing by radio frequency plasma[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(3): 64-73. doi: 10.7513/j.issn.1004-7638.2021.03.010

Citation:

Ying Zhenhong, Tan Chong, Shi Qi, Li Guifa, Zheng Haizhong, Liu Xin. Preparation of spherical titanium-tantalum alloy powder for additive manufacturing by radio frequency plasma[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(3): 64-73. doi: 10.7513/j.issn.1004-7638.2021.03.010

Citation:

Ying Zhenhong, Tan Chong, Shi Qi, Li Guifa, Zheng Haizhong, Liu Xin. Preparation of spherical titanium-tantalum alloy powder for additive manufacturing by radio frequency plasma[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(3): 64-73. doi: 10.7513/j.issn.1004-7638.2021.03.010

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Preparation of spherical titanium-tantalum alloy powder for additive manufacturing by radio frequency plasma

doi: 10.7513/j.issn.1004-7638.2021.03.010

Ying Zhenhong^{1, 2
,},
Tan Chong²,
Shi Qi²,
Li Guifa¹,
Zheng Haizhong¹,
Liu Xin^{2
,
,}

1.
School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, Jiangxi, China
2.
Institute of Materials and Processing, Guangdong Academy of Sciences, Guangzhou 510650, Guangdong, China

Received Date: 2021-04-07
Publish Date: 2021-06-10

Abstract

Abstract

The titanium-tantalum alloy powder prepared by hydrogen decrepitation process with irregular morphology was spheroidized by radio frequency (RF) plasma. The effects of feeding rate, carrier gas flow rate and sheath gas (He) flow rate on the spheroidization efficiency, powder characteristics and microstructure were studied. The selective laser melting (SLM) process of the spherical titanium-tantalum alloy powder was also explored. The results show that the cross-sectional microstructure of the powder is lamellar α″-Ti and cellular β-Ti after spheroidization, with the spheroidization efficiency over 98%. The particle size distribution becomes wider and the average particle size increases from 21.41 μm to 32.30 μm. The spheroidization efficiency is influenced by the feeding rate, carrier gas flow rate, sheath gas (He) flow rate. The best spheroidization efficiency can be obtained at 35 g/min of feeding rate, 5.5 L/min of carrier gas flow rate and 40 L/min of sheath gas (He) flow rate, respectively. Compared with the raw powder, the hall velocity of the spherical titanium-tantalum alloy powder reaches 6.27 s/50 g, with the apparent density and tap density increased from 1.38 g/cm³ to 3.11 g/cm³, 2.54 g/cm³ to 3.48 g/cm³, respectively. The spherical titanium-tantalum alloy powder is compatible with the selective laser melting process. The relative density of the formed parts is over 99%, with the microstructure of acicular α″-Ti and cellular β-Ti. No unmelted tantalum particles can be found in the samples and the vickers hardness of the samples reaches 725 HV.
- titanium-tantalum alloy powder,
- RF plasma spheroidization,
- powder characteristics,
- selected laser melting,
- microstructure

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References(23)

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