In this study, bulk nickel-carbon nanotube (CNT) nanocomposites are synthesized by a novel method which includes a combination of ultrasonication, electrical explosion of wire in liquid and spark plasma sintering. The mechanical characteristics of the bulk Ni-CNT composites synthesized with CNT contents of 0.7, 1, 3 and 5 wt.% are investigated. X-ray diffraction, optical microscopy and field emission scanning electron microscopy techniques are used to observe the different phases, morphologies and structures of the composite powders as well as the sintered samples. The obtained results reveal that the as-synthesized composite exhibits substantial enhancement in the microhardness and values more than 140 HV are observed. However an empirical reinforcement limit of 3 wt.% is determined for the CNT content, beyond which, there is no significant improvement in the mechanical properties.

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• Fabrication of nanocomposites by electric explosion of stainless steel capillaries filled with carbon nanotubes
  Tao Jiang, Zhongyu Hou
  Applied Surface Science.2020; 513: 145824.     CrossRef
• Effect of a nano-sized TiC particle addition on the flow-assisted corrosion resistance of SA 106B carbon steel
  Jin-Ju Park, Eun-Kwang Park, Gyoung-Ja Lee, Chang-Kyu Rhee, Min-Ku Lee
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In this study, Fe-Cu-Ni-Mo-C low alloy steel powder is consolidated by spark plasma sintering (SPS) process. The internal structure and the surface fracture behavior are studied using field-emission scanning electron microscopy and optical microscopy techniques. The bulk samples are polished and etched in order to observe the internal structure. The sample sintered at 900°C with holding time of 10 minutes achieves nearly full density of 98.9% while the density of the as-received conventionally sintered product is 90.3%. The fracture microstructures indicate that the sample prepared at 900°C by the SPS process is hard to break out because of the presence of both grain boundaries and internal particle fractures. Moreover, the lamellar pearlite structure is also observed in this sample. The samples sintered at 1000 and 1100°C exhibit a large number of tiny particles and pores due to the melting of Cu and aggregation of the alloy elements during the SPS process. The highest hardness value of 296.52 HV is observed for the sample sintered at 900°C with holding time of 10 minutes.

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• Fabrication of Fe-Si-B Based Amorphous Powder Cores by Spark Plasma Sintered and Their Magnetic Properties
  Liang Yan, Biao Yan, Yin Jian
  Materials.2022; 15(4): 1603.     CrossRef
• Effect of Milling Time and Addition of PCA on Austenite Stability of Fe-7%Mn Alloy
  Seung-Jin Oh, In-Jin Shon, Seok-Jae Lee
  Journal of Korean Powder Metallurgy Institute.2018; 25(2): 126.     CrossRef
• Sintering and Microstructures of SUS 316L Powder Produced by 3D Printing Process
  W.J. Kim, H.-H. Nguyen, H.Y. Kim, M.-T. Nguyen, H.S. Park, J.-C. Kim
  Archives of Metallurgy and Materials.2017; 62(2): 1215.     CrossRef
• Fabrication and Mechanical Property of Fe-20Cu-1C Compacts by SPS process with Different Heating Rate
  Jung-Han Ryu, Soo-Sik Shin, Byung-Rok Ryu, Kyung-Sik Kim, Jun-Ho Jang, Ik-Hyun Oh, Kap-Tae Kim, Hyun-Kuk Park
  Journal of Korean Powder Metallurgy Institute.2017; 24(4): 302.     CrossRef