In-situ compaction and sintering of Al2O3 – GNP nanoparticles using a high-frequency induction system
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Uğur Çavdar
Abstract
In-situ compaction and sintering of nanopowders are of great interest with respect to industrial production because they save time and energy. As a key study, Al2O3-1 wt.-% GNP composites were mixed in a V-type mixer for 2 hours at 35 cycle/min to obtain homogeneous mixtures. Mixed graphene nanoplatelets and alumina nanoparticles were compacted and sintered in-situ by applying uni-axial pressure in a graphite die, heated and generated by the ultra high-frequency induction system (UHFIHS). The graphite die was heated to 1500, 1550, 1600 and 1650 °C for 5, 10 and 20 minutes under a vacuum. The effect of sintering temperature and time on density, surface roughness, hardness and the microstructure of in-situ sintered nano graphene-alumina compacts were investigated.
Kurzfassung
Das in-situ Kompaktieren und Sintern von Nanopulvern sind von großem Interesse bei ihrer industriellen Herstellung, weil damit Zeit und Kosten eingespart werden können. Als eine Schlüsselstudie wurden für den vorliegenden Beitrag Al2O3-1 wt.-% GNP Komposite in einem Mischer des V-Typs für zwei Stunden und über 35 Zyklen pro Stunde gemischt, um homogene Mischungen zu erhalten. Es wurden gemischte Graphen-Nanoplättchen und Aluminiumoxid-Nanopartikel kompaktiert und in-situ gesintert, indem ein uniaxialer Druck unter Hitze in einer Graphitform unter Anwendung eines Ultra-Hochfrequenz-Induktionssystemes (ultra high-frequency induction system (UHFIHS)) aufgebracht wurde. Die Grafitform wurde auf 1500, 1550, 1600 und 1650 °C für 5, 10 und 20 Minuten in einem Vakuum erhitzt. Es wurde die Auswirkung der Sintertemperatur und -zeit auf die Dichte, Oberflächenrauheit, Härte und Mikrostruktur der in-situ gesinterten Nano-Graphen-Alumniumoxid-Materialien untersucht.
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© 2018, Carl Hanser Verlag, München
Artikel in diesem Heft
- Inhalt/Contents
- Contents
- Fachbeiträge/Technical Contributions
- An investigation of the crash performance of magnesium, aluminum and advanced high strength steels and different cross-sections for vehicle thin-walled energy absorbers
- Model-based correlation between change of electrical resistance and change of dislocation density of fatigued-loaded ICE R7 wheel steel specimens
- Tensile strength of 3D printed materials: Review and reassessment of test parameters
- Numerical calculation of stress concentration of various subsurface and undercutting pit types
- Chemical composition of chosen phase constituents in austempered ductile cast iron
- Investigation of initial yielding in the small punch creep test
- Optimization and characterization of friction surfaced coatings of ferrous alloys
- Influence of the milling process on TiB2 particle reinforced Al-7 wt.-% Si matrix composites
- In-situ compaction and sintering of Al2O3 – GNP nanoparticles using a high-frequency induction system
- Strain-rate controlled Gleeble experiments to determine the stress-strain behavior of HSLA steel S960QL
- Thermography using a 1D laser array – From planar to structured heating
- Schichtdickenbestimmung von Oberflächenschutzsystemen für Beton mit Impulsthermografie
- Microstructure and mechanical properties of fly ash particulate reinforced AA8011 aluminum alloy composites
- High temperature compressive behavior of three-dimensional five-directional braided composites
- Dry sliding behavior of the aluminum alloy 8011 composite with 8 % fly ash
- Review on nanostructures from catalytic pyrolysis of gas and liquid carbon sources
Artikel in diesem Heft
- Inhalt/Contents
- Contents
- Fachbeiträge/Technical Contributions
- An investigation of the crash performance of magnesium, aluminum and advanced high strength steels and different cross-sections for vehicle thin-walled energy absorbers
- Model-based correlation between change of electrical resistance and change of dislocation density of fatigued-loaded ICE R7 wheel steel specimens
- Tensile strength of 3D printed materials: Review and reassessment of test parameters
- Numerical calculation of stress concentration of various subsurface and undercutting pit types
- Chemical composition of chosen phase constituents in austempered ductile cast iron
- Investigation of initial yielding in the small punch creep test
- Optimization and characterization of friction surfaced coatings of ferrous alloys
- Influence of the milling process on TiB2 particle reinforced Al-7 wt.-% Si matrix composites
- In-situ compaction and sintering of Al2O3 – GNP nanoparticles using a high-frequency induction system
- Strain-rate controlled Gleeble experiments to determine the stress-strain behavior of HSLA steel S960QL
- Thermography using a 1D laser array – From planar to structured heating
- Schichtdickenbestimmung von Oberflächenschutzsystemen für Beton mit Impulsthermografie
- Microstructure and mechanical properties of fly ash particulate reinforced AA8011 aluminum alloy composites
- High temperature compressive behavior of three-dimensional five-directional braided composites
- Dry sliding behavior of the aluminum alloy 8011 composite with 8 % fly ash
- Review on nanostructures from catalytic pyrolysis of gas and liquid carbon sources