Synthesis and characterization of MgAlON–BN composites
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Zuotai Zhang
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.
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© 2007, Carl Hanser Verlag, München
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- Editorial
- Basic
- Synthesis and oxidation of Zr3Al3C5 powders
- Standard Gibbs energy of formation of Zn17Y2 and Zn12Y determined by solution calorimetry and measurement of heat capacity from near zero Kelvin
- Phase equilibria in the Zn–Fe–S system at 450°C
- Formation of δ-Al2O3 hollow nanoparticles via a chemical vapor condensation process
- Low-cycle fatigue and damage of an uncoated and coated single crystal nickel-base superalloy SCB
- Fluidity of Mg–Al–Ca alloys in the high-pressure die casting process
- Applied
- Mechanical properties of rope-reinforced aluminium extrusions under quasistatic loading conditions
- Influence of interfaces on the mechanical properties of ultrahigh carbon steel multilayer laminates
- Thermomechanical processing of AA6061 billets for semi-solid forming
- Infrared spectroscopy and X-ray diffraction data of In – Se compounds
- Synthesis and characterization of MgAlON–BN composites
- Neutron diffraction residual stress analysis of steel engineering components: a study of the elastic and plastic anisotropy
- Notifications
- DGM News
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- Editorial
- Basic
- Synthesis and oxidation of Zr3Al3C5 powders
- Standard Gibbs energy of formation of Zn17Y2 and Zn12Y determined by solution calorimetry and measurement of heat capacity from near zero Kelvin
- Phase equilibria in the Zn–Fe–S system at 450°C
- Formation of δ-Al2O3 hollow nanoparticles via a chemical vapor condensation process
- Low-cycle fatigue and damage of an uncoated and coated single crystal nickel-base superalloy SCB
- Fluidity of Mg–Al–Ca alloys in the high-pressure die casting process
- Applied
- Mechanical properties of rope-reinforced aluminium extrusions under quasistatic loading conditions
- Influence of interfaces on the mechanical properties of ultrahigh carbon steel multilayer laminates
- Thermomechanical processing of AA6061 billets for semi-solid forming
- Infrared spectroscopy and X-ray diffraction data of In – Se compounds
- Synthesis and characterization of MgAlON–BN composites
- Neutron diffraction residual stress analysis of steel engineering components: a study of the elastic and plastic anisotropy
- Notifications
- DGM News
