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噴霧干燥結(jié)合等離子球化法制備NbMoTaWZr-HfC粉末的特性與組織演變研究
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作者單位:

1.有研粉末新材股份有限公司;2.軍事科學(xué)院國防科技創(chuàng)新研究院;3.北京有色金屬研究總院;4.有研增材技術(shù)有限公司

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基金項目:

國家自然科學(xué)基金資助（項目號51975582）,國家重點研究開發(fā)項目（項目號2018YFC1902400）北京市博士后基金,山西省基礎(chǔ)研究計劃（項目號202103021224215）


Characteristics and Microstructure Evolution of Spherical NbMoTaWZr-HfC powders fabricated by Spray Granulation Combined With Plasma Spheroidization
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Fund Project:

National Natural Science Foundation of China (51975582)，National Key R&D Program of China (2018YFC1902400),Beijing Postdoctoral Research and Foundation，Shanxi Province Science Foundation （202103021224215）

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    摘要:

    NbMoTaWZr-HfC復(fù)合材料由高溫強化顆粒與難熔高熵合金組成，具有高熔點特性，難以通過傳統(tǒng)氣霧化法制備球形粉末。本文采用噴霧干燥+射頻等離子體球化法制備NbMoTaWZr-HfC球形粉末，并對粉末的宏觀特性、物相組成和微觀組織形貌進行研究和分析。結(jié)果表明，制備的復(fù)合粉末形狀為球形，粒度范圍為13.31-32.11 μm，D50=19.62 μm。粉末球形度、流速和松裝密度分別為0.98、8.9 s/50g，7.20 g/cm3。球化后粉末由體心立方（BCC）固溶體+ZrO2+HfC物相組成，其內(nèi)部組織為枝晶和胞狀晶混合組織。球化后粉末顆粒整體成分均勻，但在枝晶微區(qū)存在元素偏析，其中W，Mo，Ta等高熔點元素在枝晶臂富集，Nb，Zr等低熔點元素在枝晶間富集，而Hf元素分布均勻。

    Abstract:

    NbMoTaWZr-HfC composite is composed of high temperature strengthened particles and refractory high entropy alloy. It is difficult to prepare the spherical powder by traditional gas atomization due to its high melting point characteristics. In this work, NbMoTaWZr-HfC spherical powder is successfully synthesized by spray granulation combined with radio frequency plasma spheroidization. The macroscopic properties, phase composition and microstructure of the powder are studied and analyzed. Results reveal that the shape of the composite powder is spherical and the particle size is range from 13.31 to 32.11 μm, D50=19.62 μm. The sphericity, flow rate and bulk density of the spheroidized powder are 0.98、8.9 s/50g，7.20 g/cm3, respectively. Moreover, the main phases of NbMoTaWZr-HfC spherical powder are body-centered-cubic ( BCC )+ ZrO2 + HfC phase and it has dendritic and cellular structure.The elements distribution in the spherical NbMoTaWZr-HfC powder is uniform, while elemental segregation at the dendritic scale region, high melting point elements such as W, Mo, Ta are enriched in the dendrite arm, and low melting point elements such as Nb, Zr are enriched at the interdendritic region, and the Hf are uniformly distributed,

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顧濤,汪禮敏,胡強,梁秀兵,付東興,陳永雄,趙新明,盛艷偉.噴霧干燥結(jié)合等離子球化法制備NbMoTaWZr-HfC粉末的特性與組織演變研究[J].稀有金屬材料與工程,2023,52(6):2161~2168.[Gu Tao, Wang Limin, Hu Qiang, Liang Xiubing, Fu Dongxing, Chen Yongxiong, Zhao Xinming, Shen Yanwei. Characteristics and Microstructure Evolution of Spherical NbMoTaWZr-HfC powders fabricated by Spray Granulation Combined With Plasma Spheroidization[J]. Rare Metal Materials and Engineering,2023,52(6):2161~2168.]
DOI：10.12442/j. issn.1002-185X.20220425

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  • 收稿日期:2022-05-15
  • 最后修改日期:2022-07-01
  • 錄用日期:2022-07-12
  • 在線發(fā)布日期: 2023-07-07
  • 出版日期: 2023-06-30