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SPS熔鑄工藝制備N(xiāo)b/Nb5Si3原位復(fù)合材料
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國(guó)家自然科學(xué)基金(50276023)；江西省自然科學(xué)基金(2007GZC1492)；江西省教育廳科技項(xiàng)目(DB200701049)


Fabrication of Nb/Nb5Si3 in-situ Composites by SPS-Casting Technology
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    摘要:

    以Nb，Si粉末為原料，采用放電等離子燒結(jié)(SPS)技術(shù)，原位合成了密實(shí)的Nb/Nb5Si3復(fù)合材料。利用掃描電鏡(SEM)、電子探針微區(qū)分析(EPMA)和X射線(xiàn)衍射(XRD)等手段對(duì)材料的組織結(jié)構(gòu)進(jìn)行了分析，并探討了材料的結(jié)構(gòu)形成機(jī)制。結(jié)果表明，合成的材料由近球狀的Nb顆粒與Nb-Nb5Si3共晶組織組成；SPS過(guò)程中產(chǎn)生的放電等離子體使Si粉及Nb顆粒的表面熔化，熔融的Nb和Si在冷卻過(guò)程中發(fā)生共晶反應(yīng)而形成Nb-Nb5Si3共晶體，而未反應(yīng)完的Nb顆粒則均勻分布在共晶組織中

    Abstract:

    With Nb and Si powders as starting material, the dense Nb/Nb5Si3 composites were in situ synthesized by spark plasma sintering (SPS) technology. The microstructures of the composites were analyzed through SEM, XRD and EPMA, and the forming mechanism was studied. The results show that the synthesized composites consist of nearly-spherical Nb particles and Nb-Nb5Si3 eutectic. Si powders and surface of Nb particles were melted due to the action of spark plasma during SPS, and the Nb-Nb5Si3 eutectic was formed by eutectic reaction of melted Si and Nb during cooling process. The residual particles of Nb were distributed homogeneously in the eutectic microstructure

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龍文元,夏 春,陳 哲,嚴(yán)有為. SPS熔鑄工藝制備N(xiāo)b/Nb5Si3原位復(fù)合材料[J].稀有金屬材料與工程,2010,39(8):1427~1430.[Long Wenyuan, Xia Chun, Chen Zhe, Yan Youwei. Fabrication of Nb/Nb5Si3 in-situ Composites by SPS-Casting Technology[J]. Rare Metal Materials and Engineering,2010,39(8):1427~1430.]
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  • 收稿日期:2009-08-25
  • 最后修改日期:2010-05-27
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