Thermal evolution of free volumes and of crystallization in amorphous Si–B–C–N ceramics
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Abstract
We report on the crystallization behavior of initially amorphous precursor-derived Si3B1C4.3N2 ceramics, making use of macroscopic and atomic scale investigation techniques. As derived from our kinetic studies upon heating, the following temperature sequence of solid state processes is observed with approximately the same kinetic time constants: after an initial densification in the amorphous state (1673K), crystallization occurs (1873K) with subsequent strain relaxation and disappearance of nanovoids (2073K). This behavior indicates an increasing activation enthalpy of the atomic mechanisms giving rise to these processes when the annealing temperature is increased. The nanovoids may be located in the turbostratic BNCx layers as derived from positron annihilation studies. For grain growth at high temperatures an activation energy of HG=3.9eV is derived.
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© 2006, Carl Hanser Verlag, München
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- Editorial
- Basic
- Three-dimensional printing of TiAl3/Al2O3 composites
- Microemulsion mediated synthesis of nanocrystalline BaTiO3: possibilities, potential and perspectives
- Solid-State 17O NMR studies on Yttria-stabilized zirconia
- Twinning in ultrathin silicon nanowires
- Re-optimization of the Mg–Sb system under topological constraints
- Mg-rich phase equilibria of Mg–Mn–Zn alloys analyzed by computational thermochemistry
- The In–Pt–Sb phase diagram
- Thermodynamic evaluation of the Al–Cr–C system
- Thermodynamic description of the Ni–Si–Ti ternary system
- Enthalpies of formation measurements and thermodynamic description of the Ag–Cu–Zn system
- Thermodynamic assessment of the Mn–Cr–O system for solid oxide fuel cell (SOFC) materials
- Subsolidus phase equilibria in the CeO2−x–SiO2–ZrO2 system: An experimental study
- Generalized Maugis–Dugdale model of an elastic cylinder in non-slipping adhesive contact with a stretched substrate
- Implications of linear relationships between local and macroscopic flow stresses in the composite model
- Applied
- Gas-phase surface alloying under “kinetic control”: A novel approach to improving the surface properties of titanium alloys
- Thin film formation by oriented attachment of polymer-capped nanocrystalline ZnO
- The sintering mechanism and microstructure evolution in SiC–AlN ceramics studiedby EFTEM
- Thermal evolution of free volumes and of crystallization in amorphous Si–B–C–N ceramics
- High-temperature deformation behavior of nanocrystalline precursor-derived Si–B–C–N ceramics in controlled atmosphere
- Nanopowder dispersion and spray-drying process: the case of Cr2O3
- Electroless deposition of brushite (CaHPO4 · 2H2O) crystals on Ti–6Al–4V at room temperature
- The role of chemisorbed anions in the aqueous processing of AlN powder
- The influence of porosity on the electrical properties of liquid-phase sintered silicon carbide
- Development of high-temperature thermoelectric materials based on SrTiO3-layered perovskites
- The influence of the preparation method on the microstructure and properties of Al2O3/TiN nanocomposites
- Infrared properties of sintered α-MnSe
- Quasi-equilibrium sintering of particle clusters containing Bernal holes
- Design of metal ceramic composites
- Notifications
- DGM News
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- Editorial
- Basic
- Three-dimensional printing of TiAl3/Al2O3 composites
- Microemulsion mediated synthesis of nanocrystalline BaTiO3: possibilities, potential and perspectives
- Solid-State 17O NMR studies on Yttria-stabilized zirconia
- Twinning in ultrathin silicon nanowires
- Re-optimization of the Mg–Sb system under topological constraints
- Mg-rich phase equilibria of Mg–Mn–Zn alloys analyzed by computational thermochemistry
- The In–Pt–Sb phase diagram
- Thermodynamic evaluation of the Al–Cr–C system
- Thermodynamic description of the Ni–Si–Ti ternary system
- Enthalpies of formation measurements and thermodynamic description of the Ag–Cu–Zn system
- Thermodynamic assessment of the Mn–Cr–O system for solid oxide fuel cell (SOFC) materials
- Subsolidus phase equilibria in the CeO2−x–SiO2–ZrO2 system: An experimental study
- Generalized Maugis–Dugdale model of an elastic cylinder in non-slipping adhesive contact with a stretched substrate
- Implications of linear relationships between local and macroscopic flow stresses in the composite model
- Applied
- Gas-phase surface alloying under “kinetic control”: A novel approach to improving the surface properties of titanium alloys
- Thin film formation by oriented attachment of polymer-capped nanocrystalline ZnO
- The sintering mechanism and microstructure evolution in SiC–AlN ceramics studiedby EFTEM
- Thermal evolution of free volumes and of crystallization in amorphous Si–B–C–N ceramics
- High-temperature deformation behavior of nanocrystalline precursor-derived Si–B–C–N ceramics in controlled atmosphere
- Nanopowder dispersion and spray-drying process: the case of Cr2O3
- Electroless deposition of brushite (CaHPO4 · 2H2O) crystals on Ti–6Al–4V at room temperature
- The role of chemisorbed anions in the aqueous processing of AlN powder
- The influence of porosity on the electrical properties of liquid-phase sintered silicon carbide
- Development of high-temperature thermoelectric materials based on SrTiO3-layered perovskites
- The influence of the preparation method on the microstructure and properties of Al2O3/TiN nanocomposites
- Infrared properties of sintered α-MnSe
- Quasi-equilibrium sintering of particle clusters containing Bernal holes
- Design of metal ceramic composites
- Notifications
- DGM News