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In-situ formation of MgO whiskers and CNTs and their influence on the mechanical properties of low-carbon MgO–C refractory composites

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Published/Copyright: April 4, 2016
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 107 Issue 4

Abstract

The influence of the addition of Ni(NO3)2 · 6H2O on the microstructure and mechanical properties of low-carbon MgO–C refractory composites was investigated. The results indicated that MgO whiskers and carbon nanotubes could be generated in low-carbon MgO–C refractory composites with Ni(NO3)2 · 6H2O in a reducing atmosphere at 1 200 °C. The magnitudes of the cold crushing strength, the cold modulus of rupture, the fracture displacement, and the residual cold crushing strength are increased by 47 %, 66 %, 8 % and 26 %, respectively. The MgO–C refractory composites with the addition of 0.6 wt.% Ni(NO3)2 · 6H2O result in better overall properties. The MgO whiskers were generated via a dissolution–diffusion–precipitation mechanism, and their growth is in accordance with the vapour–liquid–solid model.

Keywords: MgO whiskers; In-situ formation; Growth mechanism; MgO–C refractory composites; Mechanical properties
*Correspondence address, Prof. Boquan Zhu, Wuhan University of Science and Technology, No. 947, Heping avenue, Qingshan district, Wuhan city, P. R. China. Tel.: +86 2768862291, E-mail:

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Received: 2015-08-13
Accepted: 2015-10-23
Published Online: 2016-04-04
Published in Print: 2016-04-14

© 2016, Carl Hanser Verlag, München

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  2. Contents
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  10. Experimental investigation of the Zn–Co–Sb system at 450°C
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https://doi.org/10.3139/146.111344
Keywords for this article
MgO whiskers; In-situ formation; Growth mechanism; MgO–C refractory composites; Mechanical properties

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. Phage-assisted assembly of organic–inorganic hybrid bilayers
  5. 3D FEM modelling for stress simulation and experimental investigation of dual-gradient coating using PVD
  6. Phase-field simulation of liquid phase migration in the WC–Co system during liquid phase sintering
  7. Investigation of texture, microstructure, and mechanical properties of a magnesium–lanthanum alloy after thermo-mechanical processing
  8. A combination of high electrical conductivity and mechanical strength in AA1070 commercially pure aluminum wires fabricated by KoBo extrusion
  9. In-situ formation of MgO whiskers and CNTs and their influence on the mechanical properties of low-carbon MgO–C refractory composites
  10. Experimental investigation of the Zn–Co–Sb system at 450°C
  11. Hydrogen storage thermodynamics and kinetics of LaMg11Ni + x wt.% Ni (x = 100, 200) alloys synthesized by mechanical milling
  12. Effect of high magnetic field on carbide precipitation in W6Mo5Cr4V3 high-speed steel during low-temperature tempering
  13. Dependency of structure, mechanical and electrical properties on rotating magnetic field in the Bi–Sn–Ag ternary eutectic alloy
  14. Large carbide dissolution in GCr15 continuously cast billet core
  15. Short Communications
  16. Synthesis and capacitive properties of V(S2)2 nanobelts on graphene sheets
  17. Mechanical properties of the novel B2-type binary Zr – Co alloys containing the B33 phase
  18. People
  19. Prof. Dr. Robert Danzer on the occasion of his 65th birthday
  20. DGM News
  21. DGM News
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