5Si3復(fù)合材料,研究了不同含量的碳納米管對(duì)Nb/Nb5Si3復(fù)合材料的組織和性能的影響。研究表明：Nb/Nb5Si3復(fù)合材料的相組成主要為Nb、α-Nb5Si3和γ-Nb5Si3,當(dāng)CNTS加入量達(dá)到2wt.%時(shí)開(kāi)始出現(xiàn)了新相Nb4C3。復(fù)合材料的力學(xué)性能(壓縮強(qiáng)度、斷裂韌性)隨著碳納米管含量的增加而增加,加入2wt.%CNTs時(shí)達(dá)到最大值,壓縮強(qiáng)度和斷裂韌性提高幅度分別達(dá)到56%、31%；隨后加入3wt.%CNTs時(shí),壓縮強(qiáng)度和斷裂韌性都有所降低。復(fù)合材料斷口的掃描電鏡照片表明,復(fù)合材料的斷裂模式主要為脆性解理斷裂并有部分沿晶斷裂,復(fù)合材料的增韌化作用主要是由于碳納米管的拔出效應(yīng)和橋聯(lián)機(jī)制。"/>

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碳納米管增強(qiáng)Nb/Nb5Si3復(fù)合材料的組織和性能研究
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南昌航空大學(xué)航空制造工程學(xué)院,南昌航空大學(xué)航空制造工程學(xué)院,上饒職業(yè)技術(shù)學(xué)院機(jī)械系

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國(guó)家自然科學(xué)基金資助項(xiàng)目(項(xiàng)目號(hào)51271091)；江西省教育廳科技項(xiàng)目(項(xiàng)目號(hào)GJJ12420)


Study on the microstructure and properties of Nb/Nb5Si3 composites strengthened with CNTs by Spark Plasma Sintering
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College of Materials Science Engineering,Nanchang Hangkong University,College of Materials Science Engineering,Nanchang Hangkong University,Department of Mechanical Engineering,ShangRao Vocational Technical College

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    摘要:

    采用放電等離子燒結(jié)法(SPS)原位合成了多壁碳納米管(CNTS)增強(qiáng)Nb/Nb5Si3復(fù)合材料,研究了不同含量的碳納米管對(duì)Nb/Nb5Si3復(fù)合材料的組織和性能的影響。研究表明：Nb/Nb5Si3復(fù)合材料的相組成主要為Nb、α-Nb5Si3和γ-Nb5Si3,當(dāng)CNTS加入量達(dá)到2wt.%時(shí)開(kāi)始出現(xiàn)了新相Nb4C3。復(fù)合材料的力學(xué)性能(壓縮強(qiáng)度、斷裂韌性)隨著碳納米管含量的增加而增加,加入2wt.%CNTs時(shí)達(dá)到最大值,壓縮強(qiáng)度和斷裂韌性提高幅度分別達(dá)到56%、31%；隨后加入3wt.%CNTs時(shí),壓縮強(qiáng)度和斷裂韌性都有所降低。復(fù)合材料斷口的掃描電鏡照片表明,復(fù)合材料的斷裂模式主要為脆性解理斷裂并有部分沿晶斷裂,復(fù)合材料的增韌化作用主要是由于碳納米管的拔出效應(yīng)和橋聯(lián)機(jī)制。

    Abstract:

    The Nb/Nb5Si3 In-Situ composite material strengthened with CNTs were prepared by Spark Plasma Sintering (SPS). The effects of CNTs content on microstructure and properties of Nb/Nb5Si3 in situ composites were investigated. The results show that the composite consists of Nb, α- Nb5Si3, and γ- Nb5Si3 phase. When adding over 2wt% CNTs, the new phase Nb4C3 was formed in the composites. The compressive strength and fracture toughness of composites increase obviously with increasing addition of CNTs. When the addition of CNTs is the 2wt%, the compressive strength and fracture toughness reached the maximum value and increased about 56%, 31% respectively. When the CNTs content added over 2wt%, the compressive strength fracture toughness decreased. The micrographs observed by SEM of fractography show the fracture appearance of the composites belongs to brittle cleavage fracture and partial intercrystalline fracture. The toughening mechanisms of composites are mainly due to the CNTs pullout and bridging.

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龍文元,陳本隆,沈先君.碳納米管增強(qiáng)Nb/Nb5Si3復(fù)合材料的組織和性能研究[J].稀有金屬材料與工程,2018,47(7):2240~2244.[Long Wenyuan, Chen Benlong, Shen Xianjun. Study on the microstructure and properties of Nb/Nb5Si3 composites strengthened with CNTs by Spark Plasma Sintering[J]. Rare Metal Materials and Engineering,2018,47(7):2240~2244.]
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  • 收稿日期:2016-06-12
  • 最后修改日期:2016-07-23
  • 錄用日期:2016-09-14
  • 在線發(fā)布日期: 2018-10-10
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