Preparation of CNTs Reinforced Nb/Nb<sub>5</sub>Si<sub>3</sub> In-situ Composites by Spark Plasma Sintering

Long Wenyuan; Xiong Wei; Yao Junping

doi:10.15980/j.tzzz.2015.02.002

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Preparation of CNTs Reinforced Nb/Nb₅Si₃ In-situ Composites by Spark Plasma Sintering
Vol. 35, Issue 2, Pages: 119-123(2015)
Published： 2015 ，
DOI： 10.15980/j.tzzz.2015.02.002

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[1]龙文元,熊伟,尧军平.等离子烧结制备CNTs增强Nb/Nb_5Si_3复合材料[J].特种铸造及有色合金,2015,35(02):119-123.

Long Wenyuan, Xiong Wei, Yao Junping. Preparation of CNTs Reinforced Nb/Nb₅Si₃ In-situ Composites by Spark Plasma Sintering. [J]. Special Casting & Nonferrous Alloys 35(2):119-123(2015)
[1]龙文元,熊伟,尧军平.等离子烧结制备CNTs增强Nb/Nb_5Si_3复合材料[J].特种铸造及有色合金,2015,35(02):119-123. DOI： 10.15980/j.tzzz.2015.02.002.

Long Wenyuan, Xiong Wei, Yao Junping. Preparation of CNTs Reinforced Nb/Nb₅Si₃ In-situ Composites by Spark Plasma Sintering. [J]. Special Casting & Nonferrous Alloys 35(2):119-123(2015) DOI： 10.15980/j.tzzz.2015.02.002.

摘要

采用放电等离子烧结（SPS）技术

在烧结温度为1 500℃

升温速度为150℃/min下

制备了CNTs含量分别为1%、2%和3%的Nb/Nb5Si3复合材料。研究了不同CNTs含量的放电等离子烧结Nb/Nb5Si3复合材料的组织与性能。结果表明

复合材料的组织主要由Nb、α-Nb5Si3和γ-Nb5Si3相组成

当CNTs含量超过2%时复合材料中出现了新相Nb4C3

可能是因为CNTs结构在球磨或烧结的过程中被破坏

与Nb粉发生了化学反应。在烧结工艺参数相同的条件下

随着CNTs含量的增加

复合材料的致密度有所下降

硬度（HRC）先增加

当CNTs的含量约为2%时达到最大为66

含量超过2%时

复合材料的界面结合能力差

致密度降低较多

硬度下降。延长保温时间和增加压力

会使得复合材料的致密度和硬度增大。

Abstract

CNTs/Nb-20 Si composites with 1%

2%and 3% CNTs addition were prepared at 1 500℃and150 ℃/min by spark plasma sintering（SPS）

and effects of CNTs content on microstructures and properties of Nb/Nb5Si3 in situ composites were investigated.The results show that the in-situ composites consist of Nb

α-Nb5Si3andγ-Nb5Si3 phase.With CNTs content addition more than 2%

the new phase Nb4C3 can be observed in the composites

which may be attributed to CNTs structure being destroyed in a ball or sintering process to take place the chemical reaction.At the same sintering process parameters

the densities of the composites are decreased obviously with the increase of CNTs content.The maximum hardness（HRC）66of the composites prepared can be presented with 2%addition of CNTs.However

with CNTs addition more than 2%

the relative densities and hardness are decreased as a result of poor interfacial adhesion.The relative densities and hardness of the composites are increased with the increase of holding time and pressure.