2@Nb粉體。采用表面活性劑SDS（CHSO4Na）和CTAB（C19H42BrN）對2種顆粒表面進行改性，使其帶電，并用Zeta電位計測試懸浮液的Zeta電位。采用掃描電鏡、透射電鏡和能譜儀對合成材料的物相、形貌、結(jié)構(gòu)和元素分布進行了表征。結(jié)果表明：當SDS濃度為2 mmol/L，CTAB濃度為3 mmol/L，Nb懸浮液pH值為5時，二次包覆后涂層效果較好。在200 ℃氬氣中煅燒2 h后，Nb與MoSi2的界面處發(fā)現(xiàn)了NbSi2相，表明Nb具有高活性并與Si反應(yīng)。在1450 ℃單軸壓力40 MPa下放電等離子燒結(jié)2 h后，MoSi2@Nb材料中仍保留了核殼結(jié)構(gòu)。然而，Nb與MoSi2反應(yīng)強烈，大部分Nb相發(fā)生反應(yīng)，這個問題在后續(xù)研究中亟待解決。與MoSi2材料的斷裂韌性（KIC=3.32 MPa·m0.5）相比，MoSi2@Nb材料的KIC顯著提高至5.75 MPa·m0.5。"/>

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SPS燒結(jié)制備MoSi2@Nb核殼結(jié)構(gòu)材料及其表征
作者:
作者單位:

1.南昌航空大學(xué) 材料科學(xué)與工程學(xué)院，江西 南昌 330063;2.南昌航空大學(xué) 江西省航空材料表面技術(shù)工程研究中心，江西 南昌 330063

作者簡介:

通訊作者:

中圖分類號:

TB331

基金項目:

國家自然科學(xué)基金項目（面上項目，重點項目，重大項目）（51861026）;南昌航空大學(xué)研究生創(chuàng)新專項基金（YC2022-011）


Preparation and Characterization of Core-Shell MoSi2@Nb Materials Sintered by SPS
Author:
Affiliation:

1.School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang330063, China;2.Jiangxi Provincial Engineering Research Center for Surface Technology of Aeronautical Materials, Nanchang Hangkong University, Nanchang330063, China

Fund Project:

National Natural Science Foundation of China (51861026); The Graduate Innovation Special Fund of Nanchang Hangkong University (YC2022-011)

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    摘要:

    采用靜電層自組裝法制備了核殼MoSi2@Nb粉體。采用表面活性劑SDS（CHSO4Na）和CTAB（C19H42BrN）對2種顆粒表面進行改性，使其帶電，并用Zeta電位計測試懸浮液的Zeta電位。采用掃描電鏡、透射電鏡和能譜儀對合成材料的物相、形貌、結(jié)構(gòu)和元素分布進行了表征。結(jié)果表明：當SDS濃度為2 mmol/L，CTAB濃度為3 mmol/L，Nb懸浮液pH值為5時，二次包覆后涂層效果較好。在200 ℃氬氣中煅燒2 h后，Nb與MoSi2的界面處發(fā)現(xiàn)了NbSi2相，表明Nb具有高活性并與Si反應(yīng)。在1450 ℃單軸壓力40 MPa下放電等離子燒結(jié)2 h后，MoSi2@Nb材料中仍保留了核殼結(jié)構(gòu)。然而，Nb與MoSi2反應(yīng)強烈，大部分Nb相發(fā)生反應(yīng)，這個問題在后續(xù)研究中亟待解決。與MoSi2材料的斷裂韌性（KIC=3.32 MPa·m0.5）相比，MoSi2@Nb材料的KIC顯著提高至5.75 MPa·m0.5。

    Abstract:

    Core-shell MoSi2@Nb powder was prepared by electrostatic layer self-assembly method. The surfactants SDS (CHSO4Na) and CTAB (C19H42BrN) were used to modify the surface of the two particles to make them charged, and the Zeta potential of the suspension was tested by the Zeta potentiometer. Scanning electron microscope, transmission electron microscope and energy dispersive spectrometer were used to characterize the phase, morphology, microstructure and element distribution of synthetic materials. The results show that when the SDS concentration is 2 mmol/L, the CTAB concentration is 3mmol/L and the pH value of Nb suspension is 5, the coating effect is better after secondary cladding. NbSi2 phase is found at the interface between Nb and MoSi2 after calcination at 200 °C for 2 h in Ar atmosphere, indicating that Nb is highly active and reacts with Si. Core-shell structure is still retained in MoSi2@Nb material after spark plasma sintering at 1450 °C for 2 h under uniaxial pressure of 40 MPa. However, it is found that Nb reacts strongly with MoSi2, and most of the Nb phase is reacted. This issue needs to be addressed in subsequent studies. The fracture toughness (KIC) of MoSi2@Nb material is significantly improved to 5.75 MPa·m0.5 compared with that of MoSi2 material (3.32 MPa·m0.5).

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羅佳軍,全慈旺,張建軍,陳水香,張茜彤,韓孟瑤,梁炳亮,陳衛(wèi)華.SPS燒結(jié)制備MoSi2@Nb核殼結(jié)構(gòu)材料及其表征[J].稀有金屬材料與工程,2024,53(11):3053~3063.[Luo Jiajun, Quan Ciwang, Zhang Jianjun, Chen Shuixiang, Zhang Xitong, Han Mengyao, Liang Bingliang, Chen Weihua. Preparation and Characterization of Core-Shell MoSi2@Nb Materials Sintered by SPS[J]. Rare Metal Materials and Engineering,2024,53(11):3053~3063.]
DOI：10.12442/j. issn.1002-185X.20240105

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  • 收稿日期:2024-02-29
  • 最后修改日期:2024-09-18
  • 錄用日期:2024-04-17
  • 在線發(fā)布日期: 2024-11-18
  • 出版日期: 2024-11-08