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低壓等離子噴涂制備噴霧干燥型與機(jī)械混合型ZrB2-MoSi2復(fù)合涂層的比較研究
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華南理工大學(xué) 材料科學(xué)與工程學(xué)院,廣州有色金屬研究院 新材料研究所,廣州有色金屬研究院 新材料研究所,廣州有色金屬研究院 新材料研究所,華南理工大學(xué) 材料科學(xué)與工程學(xué)院

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A comparative study of spray-dried and mechanically-mixed ZrB2-MoSi2 composite coatings fabricated by LPPS
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School of Materials Science and Engineering, South China University of Technology,Institute of New Materials, Guangzhou Research Institute of Non-ferrous Metals,Institute of New Materials, Guangzhou Research Institute of Non-ferrous Metals,Institute of New Materials, Guangzhou Research Institute of Non-ferrous Metals,School of Materials Science and Engineering, South China University of Technology

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    摘要:

    利用噴霧干燥與真空燒結(jié)技術(shù)制備團(tuán)聚型ZrB2-MoSi2復(fù)合粉末，以這些粉末為原料，通過(guò)低壓等離子噴涂法制備了ZrB2-30 wt.%MoSi2復(fù)合涂層(SZM涂層)。作為對(duì)比，利用機(jī)械混合粉末制備了ZrB2-30 wt.%MoSi2復(fù)合涂層(MZM涂層)。借助SEM、XRD和EDS等對(duì)涂層的組織結(jié)構(gòu)進(jìn)行研究，并利用霍爾流速計(jì)和松裝密度計(jì)對(duì)團(tuán)聚粉末的流動(dòng)性和松裝密度進(jìn)行了測(cè)試。此外，對(duì)涂層的顯微硬度、孔隙率和氧化特性均進(jìn)行了研究。結(jié)果表明：噴霧干燥粉末在1200℃真空燒結(jié)1h后，它的流動(dòng)性和松裝密度分別達(dá)到25.8 s/50g 和1.12 g/cm3。與MZM涂層相比，SZM涂層中的MoSi2分布更加均勻，而且結(jié)構(gòu)更加致密。所以團(tuán)聚粉末制備的涂層在1500℃的抗氧化性能更好。

    Abstract:

    In this work, the agglomerated ZrB2-MoSi2 composite powders were successfully prepared by spray drying and sintering. The spray-dried ZrB2-30wt.%MoSi2 (SZM) composite coating was manufactured by low pressure plasma spray (LPPS) using the agglomerated powders. For comparison, the mechanically-mixed ZrB2-30wt.%MoSi2 (MZM) composite coating was also prepared by LPPS. The composite powders and coatings were characterized by X-ray diffraction and scanning electron microscopy. The mobility and loose density of the agglomerated powders were measured by hall flowmeter and loose density instrument, respectively. Microhardness, porosity and oxidation behavior of the coatings also were investigated. The results show that, when the spray-dried powders were sintered at 1200℃ for 1 h, The mobility and loose density were up to 25.8 s/50g and 1.12 g/cm3, respectively. The MoSi2 phase of SZM coating distributed much more uniformly than that of MZM coating. Additionally, the SZM coating had high compactness and much better oxidation-resistance at 1500℃ compared to the MZM coating.

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毛金元,劉敏,鄧春明,毛杰,曾德長(zhǎng).低壓等離子噴涂制備噴霧干燥型與機(jī)械混合型ZrB2-MoSi2復(fù)合涂層的比較研究[J].稀有金屬材料與工程,2016,45(6):1386~1390.[Mao Jinyuan, Liu Min, Deng Chunmin, Mao Jie, Zeng Dechang. A comparative study of spray-dried and mechanically-mixed ZrB2-MoSi2 composite coatings fabricated by LPPS[J]. Rare Metal Materials and Engineering,2016,45(6):1386~1390.]
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  • 收稿日期:2014-05-04
  • 最后修改日期:2014-07-11
  • 錄用日期:2014-08-12
  • 在線發(fā)布日期: 2016-10-08
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