A novel sintered multi-walled carbon nanotubes bone material by spark plasma sintering method

This article focuses on exploring how the electrical conductivity and densification properties of metallic samples made from aluminum (Al) powders reinforced with 0.5 wt % concentration of multi-walled carbon nanotubes (MWCNTs) and consolidated through spark plasma sintering (SPS) process are affected by the carbon nanotubes dispersion and the Al particles morphology. Experimental characterization tests performed by scanning electron microscopy (SEM) and by energy dispersive spectroscopy (EDS) show that the MWCNTs were uniformly ball-milled and dispersed in the Al surface particles, and undesirable phases were not observed in X-ray diffraction measurements. Furthermore, high densification parts and an improvement of about 40% in the electrical conductivity values were confirmed via experimental tests performed on the produced sintered samples. These results elucidate that modifying the powder morphology using the ball-milling technique to bond carbon nanotubes into the Al surface particles aids the ability to obtain highly dense parts with increasing electrical conductivity properties.

Download Full-text

Reinforcement of B4C Ceramics with Multi-Walled Carbon Nanotubes

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.66.41 ◽

2009 ◽

Vol 66 ◽

pp. 41-44 ◽

Cited By ~ 6

Author(s):

Fan Zhang ◽

Zheng Yi Fu ◽

Jin Yong Zhang ◽

Hao Wang ◽

Wei Min Wang ◽

...

Keyword(s):

Mechanical Property ◽

Carbon Nanotubes ◽

Fracture Toughness ◽

Composite Materials ◽

Grain Boundaries ◽

Spark Plasma Sintering ◽

Plasma Sintering ◽

Multi Walled Carbon Nanotubes ◽

Spark Plasma ◽

Walled Carbon Nanotubes

Here we have prepared B4C/CNTs composites using the spark-plasma sintering (SPS) method. Mechanical property measurements reveal obvious enhancement confirming the fabrication of true B4C/CNTs composite materials with improved toughness properties.The addition of 1wt% CNTs in the B4C increased the fracture toughness by about 1.6 times from 2.5 to 4 MPa.m1/2 because the CNTs presented at the B4C grain boundaries, made the length of cracks shorten.

Download Full-text

Spark Plasma Sintering of Aluminum-Based Powders Reinforced with Carbon Nanotubes: Investigation of Electrical Conductivity and Hardness Properties

Materials ◽

10.3390/ma14020373 ◽

2021 ◽

Vol 14 (2) ◽

pp. 373

Author(s):

Nicolás A. Ulloa-Castillo ◽

Oscar Martínez-Romero ◽

Roberto Hernandez-Maya ◽

Emmanuel Segura-Cárdenas ◽

Alex Elías-Zúñiga

Keyword(s):

Carbon Nanotubes ◽

Crystallite Size ◽

Spark Plasma Sintering ◽

Surface Hardness ◽

Composite Surface ◽

Plasma Sintering ◽

Hardness Tests ◽

Multi Walled Carbon Nanotubes ◽

Spark Plasma ◽

Walled Carbon Nanotubes

This paper focuses on reporting results obtained by the spark plasma sintering (SPS) consolidation and characterization of aluminum-based nanocomposites reinforced with concentrations of 0.5 wt%, 1 wt% and 2 wt% of single-walled carbon nanotubes (SWCNTs) and multi-walled carbon nanotubes (MWCNTs). Experimental characterization performed by SEM shows uniform carbon nanotube (CNT) dispersion as well as carbon clusters located in the grain boundary of the Al matrix. The structural analysis and crystallite size calculation were performed by X-ray diffraction tests, detecting the characteristic CNT diffraction peak only for the composites reinforced with MWCNTs. Furthermore, a considerable increment in the crystallite size value for those Al samples reinforced and sintered with 1 wt% of CNTs was observed. Hardness tests show an improvement in the composite surface hardness of about 11% and 18% for those samples reinforced with 2 wt% of SWNCTs and MWCNTs, respectively. Conductivity measurements show that the Al samples reinforced with 2 wt% of MWCNTs and with 0.5 wt% SWCNTs reach the highest IACS values of 50% and 34%, respectively.

Download Full-text

Structure, phase composition and mechanical properties of composites based on ZrO2 and multi-walled carbon nanotubes

Perspektivnye Materialy ◽

10.30791/1028-978x-2020-10-56-68 ◽

2020 ◽

Vol 10 ◽

pp. 56-68

Author(s):

A. A. Leonov ◽

◽

E. V. Abdulmenova ◽

M. P. Kalashnikov ◽

◽

...

Keyword(s):

Carbon Nanotubes ◽

Phase Composition ◽

Zirconium Carbide ◽

Cubic Phase ◽

Plasma Sintering ◽

Multi Walled Carbon Nanotubes ◽

Spark Plasma ◽

Walled Carbon Nanotubes ◽

Tetragonal Phase Transition ◽

Properties Of Composites

In this work, composites based on yttria-stabilized zirconia (3Y-TZP), with additives of 1, 5 and 10 wt. % multi-walled carbon nanotubes (MWCNTs) were investigated. Samples were obtained by spark plasma sintering at a temperature of 1500 °C. It was found that MWCNTs retain their structure after high-temperature sintering, they are located along the grain boundaries of ZrO2, forming a network structure. Found that the addition of 1 wt. % MWCNTs increase the relative density of the composite from 98.3 % to 99.0 %. It is noted that nanotubes can significantly affect the phase composition of composites. Additive 5 wt. % MWCNT partially limits the monoclinic-tetragonal phase transition of ZrO2, and the addition of 10 wt. % MWCNTs leads to the formation of a cubic phase of zirconium carbide. It was found that the fracture toughness of the composite with 10 wt. % MWCNTs increases from 4.0 to 5.7 MPa·m1/2.

Download Full-text