Plasma-Spark Sintering of Oxide–Non-Oxide Components with the Addition of a TiC–ZrC Solid Solution and Various Metal Powder Mixtures

2021 ◽  
Vol 61 (5) ◽  
pp. 568-579
Author(s):  
A. V. Hmelov
Keyword(s):  
Solid Solution ◽  
Metal Powder ◽  
Powder Mixtures

Gasless combustion of metal powder mixtures

1976 ◽  
Vol 11 (3) ◽  
pp. 293-300 ◽  
Author(s):  
Yu. S. Naiborodenko ◽  
V. I. Itin
Keyword(s):  
Metal Powder ◽  
Gasless Combustion ◽  
Powder Mixtures

Study of particularities of metal powder mixtures injection molding

2018 ◽  
Author(s):  
М.В. Тверской ◽  
◽  
А.А. Хилкова ◽  
Д.Э. Хилков ◽  
◽  
...  
Keyword(s):  
Injection Molding ◽  
Metal Powder ◽  
Powder Mixtures

Effects of Sintering Conditions on the Mechanical Properties of Alumina Particle Dispersed Magnesium SPS Compacts

2014 ◽  
Vol 783-786 ◽  
pp. 2433-2438 ◽  
Author(s):  
Shigehiro Kawamori ◽  
Hiroshi Fujiwara ◽  
Yukio Kasuga
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Alumina Particle ◽  
Applied Pressure ◽  
Powder Mixtures ◽  
Cooling Conditions ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Xrd And Tem ◽  
Main Factor

To enhance the mechanical properties of Mg alloys, 0-30vol% Al2O3/Mg powders were formed by ball milling powder mixtures of pure Mg and Al2O3 particles, and then Spark plasma sintering (SPS) compacts (Al2O3/Mg discs) were made by the Al2O3/Mg powders. The effect of the cooling conditions in the SPS process on the mechanical properties of the Al2O3/Mg discs was investigated. From the results of SEM, XRD and TEM-EDS, the microstructures of the Al2O3/Mg discs were identified to consist of α-Mg solid solution, Al2O3 particles, refined MgO particles and refined needle-like Mg17Al12 ( more than 20vol% Al2O3 content). The mechanical properties of the discs were able to control by the regulation of the cooling conditions (cooling rate (vc) and applied pressure in the cooling (pc)) in SPS process, and as a result, the SPS discs possessing the mechanical properties beyond HP compacts were obtained under the cooling conditions of “vc= 0.83K/sand pc = 20MPa”. Main factor that the cooling conditions in SPS process effect on the mechanical properties of the Al2O3/Mg discs are considered to be the compresive residual stress generated in the α - Mg solid solution by the thermal stress associated with deference of the coefficients of thermal expansion between the α - Mg and ceramics particles (Al2O3 and MgO) in the discs.

Self ignition of layers of metal powder mixtures

2014 ◽  
Vol 254 ◽  
pp. 160-169 ◽  
Author(s):  
Olivier Dufaud ◽  
David Bideau ◽  
Fabienne Le Guyadec ◽  
Jean-Pierre Corriou ◽  
Laurent Perrin ◽  
...  
Keyword(s):  
Metal Powder ◽  
Powder Mixtures

Synthesis of Ti3Si0.4Al0.8C1.8 Solid Solution

2008 ◽  
Vol 368-372 ◽  
pp. 995-997
Author(s):  
Cui Wei Li ◽  
Hong Xiang Zhai ◽  
Yang Zhou ◽  
Shi Bo Li ◽  
Zhi Li Zhang
Keyword(s):  
Electron Microscopy ◽  
Solid Solution ◽  
Scanning Electron Microscopy ◽  
Single Phase ◽  
Lattice Parameters ◽  
Molar Ratio ◽  
X Ray Diffraction ◽  
Powder Mixtures ◽  
X Ray ◽  
Scanning Electron

In this study, free Ti/Si/Al/C powder mixtures with molar ratio of 3:0.4:0.8:1.8 were heated in Argon with various schedules, in order to reveal the possibility for the synthesis of Ti3Si0.4Al0.8C1.8 solid solution powder. X-ray diffraction (XRD) was used for the evaluation of phase identities of the powder after different treatments. Scanning electron microscopy (SEM) was used to observe the morphology of the Ti3Si0.4Al0.8C1.8 solid solution. XRD results showed that predominantly single phase samples of Ti3Si0.4Al0.8C1.8 was prepared after heating at 1400oC for 5 min in Argon and the lattice parameters of Ti3Si0.4Al0.8C1.8 lay between those of Ti3SiC2 and Ti3AlC2.

scholarly journals Microstructural Evolution, Thermodynamics and Kinetics of Mo-Tm2O3 Powder Mixtures during Ball Milling

2016 ◽  
Author(s):  
Yong Luo ◽  
Guang Ran ◽  
Nanjun Chen ◽  
Qiang Shen ◽  
Yaoli Zhang
Keyword(s):  
Solid Solution ◽  
Ball Milling ◽  
Microstructural Evolution ◽  
Driving Force ◽  
Phase Evolution ◽  
Heat Of Mixing ◽  
Powder Mixtures ◽  
Thermodynamics And Kinetics ◽  
Transmission Electron ◽  
Kinetics Of

The microstructural evolution, thermodynamics and kinetics of Mo-21%Tm2O3 (mass fraction, %) powder mixtures during ball milling were investigated using X-ray diffraction and transmission electron microscopy. Ball milling induced Tm2O3 to be decomposed and then dissolved into Mo crystal. The supersaturated nanocrystalline solid solution of Mo (Tm, O) was obtained after 96 h of ball milling. The elements of Mo, Tm and O were distributed uniformly in the ball-milled particles. Based on the semi-experimental theory of Miedema, a thermodynamic model was developed to calculate the driving force of phase evolution. There was no chemical driving force to form a crystal solid solution of Tm atoms in Mo crystal or an amorphous phase because the Gibbs free energy for both processes was higher than zero. For Mo-21%Tm2O3, it was mechanical work, not negative heat of mixing, that provided the driving force to form supersaturated nanocrystalline Mo (Tm, O) solid solution.

Formation of eutectic RuAl/Ru nanocomposite by mechanical alloying and subsequent annealing

2001 ◽  
Vol 16 (9) ◽  
pp. 2459-2462 ◽  
Author(s):  
K. W. Liu ◽  
F. Mücklich ◽  
R. Birringer
Keyword(s):  
Solid Solution ◽  
Differential Scanning Calorimetry ◽  
Mechanical Alloying ◽  
Heat Release ◽  
Eutectic Composition ◽  
Scanning Calorimetry ◽  
Powder Mixtures ◽  
Al Powder ◽  
Al Matrix ◽  
Milled Powders

No abrupt reaction was observed during mechanical alloying (MA) of Ru and Al powder mixtures with an eutectic composition (Ru70Al30). As-milled powders constitute mainly a Ru(Al) solid solution and/or mixture (matrix), and a very small quantity of RuAl. The complete reaction between Ru and Al during MA was speculated to be hampered by excess Ru in Ru70Al30. No exothermic heat release was detected in differential scanning calorimetry for as-milled powders. Precipitation of RuAl from as-milled Ru(Al) matrix was observed after annealing at various temperatures. The phase fraction of Ru and RuAl reaches an approximately equilibrium value after annealing at 1173 K.

Synthesis and Microstructural Evaluation of SiC-AlN Composites

2007 ◽  
Vol 352 ◽  
pp. 193-196 ◽  
Author(s):  
Keita Shirouzu ◽  
Yuki Nonaka ◽  
Mikinori Hotta ◽  
Naoya Enomoto ◽  
Junichi Hojo
Keyword(s):  
Solid Solution ◽  
Grain Growth ◽  
Lattice Constant ◽  
Firing Temperature ◽  
Microscopic Level ◽  
The Other ◽  
Compositional Variation ◽  
Powder Mixtures ◽  
Sem Observation ◽  
Microstructural Evaluation

High-density SiC-AlN composites were fabricated from powder mixtures (50:50 in mol) in 1900oC-2100oC temperature range by SPS process. SiC(0.3μm or 0.03μm) and AlN(1.1μm) were used as starting materials. The density of composite increased with increasing firing temperature. From the identification of crystal phase and the change of lattice constant, mixed phases of 3C(β-SiC)ss and 2H(α-SiC/AlN)ss were found at 1900oC and 2000oC, and only 2Hss was found at 2100oC. The OM and EPMA observation indicated that SiC-rich regions (size:10-50μm) existed throughout SiC(0.3μm)-AlN composite because of aggregation of SiC powder. In SiC(0.03μm)-AlN composite, on the other hand, SiC-rich regions (size:submicron) and AlN-rich regions (size: approximately 1μm) existed on a microscopic level at 1900oC, whereras, it was confirmed from EPMA and SEM observation that homogeneous 2H(ss) formed with large grain-growth at 2100oC. The microstructure of SiC(0.03μm)-AlN composite at 2000oC was analyzed to investigate more detailed compositional variation of solid solution. SEM-EDS observation indicated that 3C(ss), SiC-rich 2H(ss) and AlN-rich 2H(ss) existed in SiC(0.03μm)-AlN composite at 2000oC.

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