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Synthesis and characterization of MgAlON–BN composites

  • Zuotai Zhang , Wenchao Li , Xidong Wang and Seshadri Seetharaman
Published/Copyright: May 23, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 98 Issue 1

Abstract

In the present paper the Gibbs energy of formation of MgAlON was evaluated, and on this basis the phase stability diagram of Mg – Al – O – N – B was established. Dense magnesium aluminium oxynitride – boron nitride (MgAlON – BN) composites with 0 – 30 vol.% BN were synthesized by hot pressing in the temperature range 1750 – 1850 °C in the phase stability region. The phase compositions of the composites analyzed by X-ray diffraction indicated that the main phases were MgAlON and h-BN and no impurities were found. The microstructures of the composites analyzed by transmission electron microscopy, scanning electron microscopy, and high-resolution electron microscopy showed that the MgAlON did not react with BN, and the latter was distributed on the grain boundary of MgAlON homogeneously. Excessive BN (> 20 vol.%) resulted in a discontinuous microstructure for MgAlON. A matrix-flushing method was employed in the quantitative X-ray diffraction analysis for the multi-component MgAlON – BN composites. The results showed that the relative MgAlON content decreased in the process of sintering MgAlON – BN composites. Thermodynamic analysis showed that some Al2O3, AlN, and MgO escaped under the reaction conditions. The lattice parameters of MgAlON in the composites have also been evaluated.

Keywords: MgAlON – BN; Thermodynamic analysis; Composites; Quantitative analysis
* Correspondence address, Prof. Seshadri Seetharaman, Royal Institute of Technology (KTH), Department of Materials Science and Engineering, Division of Materials Process Science, Brinellvagen 23, SE-10044 Stockholm, Sweden Tel.: +46 8 790 83 55, Fax: +46 8 790 09 39 E-mail:

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Received: 2005-9-23
Accepted: 2006-4-16
Published Online: 2013-05-23
Published in Print: 2007-01-01

© 2007, Carl Hanser Verlag, München

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  15. Thermomechanical processing of AA6061 billets for semi-solid forming
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  19. Notifications
  20. DGM News
https://doi.org/10.3139/146.101426
Keywords for this article
MgAlON – BN; Thermodynamic analysis; Composites; Quantitative analysis

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Editorial
  5. Basic
  6. Synthesis and oxidation of Zr3Al3C5 powders
  7. Standard Gibbs energy of formation of Zn17Y2 and Zn12Y determined by solution calorimetry and measurement of heat capacity from near zero Kelvin
  8. Phase equilibria in the Zn–Fe–S system at 450°C
  9. Formation of δ-Al2O3 hollow nanoparticles via a chemical vapor condensation process
  10. Low-cycle fatigue and damage of an uncoated and coated single crystal nickel-base superalloy SCB
  11. Fluidity of Mg–Al–Ca alloys in the high-pressure die casting process
  12. Applied
  13. Mechanical properties of rope-reinforced aluminium extrusions under quasistatic loading conditions
  14. Influence of interfaces on the mechanical properties of ultrahigh carbon steel multilayer laminates
  15. Thermomechanical processing of AA6061 billets for semi-solid forming
  16. Infrared spectroscopy and X-ray diffraction data of In – Se compounds
  17. Synthesis and characterization of MgAlON–BN composites
  18. Neutron diffraction residual stress analysis of steel engineering components: a study of the elastic and plastic anisotropy
  19. Notifications
  20. DGM News
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