Self-propagating high-temperature synthesis of Ti3AlC2 MAX phase from mechanically-activated Ti/Al/graphite powder mixture

2018 ◽  
Vol 44 (8) ◽  
pp. 9671-9678 ◽  
Author(s):  
Maryam Akhlaghi ◽  
Seyed Ali Tayebifard ◽  
Esmaeil Salahi ◽  
Mehdi Shahedi Asl ◽  
Gert Schmidt
Keyword(s):  
High Temperature ◽  
Powder Mixture ◽  
Graphite Powder ◽  
Max Phase ◽  
Temperature Synthesis ◽  
High Temperature Synthesis

scholarly journals Al-Ti-B4C materials obtained by high-temperature synthesis and used as a master-alloy for aluminum

2018 ◽  
Vol 243 ◽  
pp. 00010 ◽  
Author(s):  
Ilya Zhukov ◽  
Vladimir Promakhov ◽  
Yana Dubkova ◽  
Alexey Matveev ◽  
Mansur Ziatdinov ◽  
...  
Keyword(s):  
High Temperature ◽  
Burning Rate ◽  
Powder Mixture ◽  
Pure Aluminum ◽  
Al Alloy ◽  
Initial Powder ◽  
Temperature Synthesis ◽  
Al Content ◽  
High Temperature Synthesis ◽  
Al Powder

The paper presents microstructure, composition, and burning rate of Al alloy produced by high-temperature synthesis (SHS) from powder mixture Al-Ti-B4C with different concentration of Al powder. It has been established that the phase composition of materials obtained at gas-free combustion includes TiB2, Al, and TiC. It is shown that Al content growth powder in initial Al-Ti- B4C mixture from 7.5 to 40 wt.% reduces the burning rate of the powder from 9*10-3 to 1.8*10-3 m/s. For the system consisting of 60 wt.% of (Ti + B4C) and 40 wt.% of Al there is the increase in the porosity of the compacted initial powder mixture from 30 to 51 and reduction in the burning rate from 1.8 * 10-3 to 1 * 10-3 m/s. The introduction of 0.2 wt.% of the obtained SHS materials into the melt of pure aluminum causes reduction of the grain size of the resulting alloy from 1200 to 410 μm.

High-temperature synthesis of cast materials based on Nb2AlC MAX phase

2019 ◽  
Vol 45 (2) ◽  
pp. 2689-2691 ◽  
Author(s):  
Pavel A. Miloserdov ◽  
Vladimir A. Gorshkov ◽  
Ivan D. Kovalev ◽  
Dmitrii Yu. Kovalev
Keyword(s):  
High Temperature ◽  
Max Phase ◽  
Temperature Synthesis ◽  
High Temperature Synthesis

Structure Formation during High-Temperature Synthesis in an Activated Ti + Al Powder Mixture

2019 ◽  
Vol 55 (11) ◽  
pp. 1097-1103
Author(s):  
V. Yu. Filimonov ◽  
M. V. Loginova ◽  
A. V. Sobachkin ◽  
S. G. Ivanov ◽  
A. A. Sitnikov ◽  
...  
Keyword(s):  
High Temperature ◽  
Structure Formation ◽  
Powder Mixture ◽  
Temperature Synthesis ◽  
High Temperature Synthesis ◽  
Al Powder

Synchrotron in situ studies of mechanical activation treatment and γ-radiation impact on structural-phase transitions and high-temperature synthesis parameters during the formation of γ-(TiAl) compound

2019 ◽  
Vol 26 (5) ◽  
pp. 1671-1678 ◽  
Author(s):  
Marina Loginova ◽  
Alexey Sobachkin ◽  
Alexander Sitnikov ◽  
Vladimir Yakovlev ◽  
Valeriy Filimonov ◽  
...  
Keyword(s):  
High Temperature ◽  
Mechanical Activation ◽  
Thermal Explosion ◽  
Powder Mixture ◽  
Maximum Temperature ◽  
Γ Irradiation ◽  
Temperature Synthesis ◽  
High Temperature Synthesis ◽  
The Impact

In situ synchrotron studies of structure and phase formation dynamics in mechanically activated (t = 7 min, power density 40 g) and mechanically activated with subsequent irradiation by γ-quanta 60Co powder mixture (Ti 64 wt% + Al) during high-temperature synthesis by the method of thermal explosion using induction heating are described. In situ high-temperature synthesis was carried out on the created experimental complex adapted for synchrotron X-ray diffraction methods. The sequence of formation and time–temperature interval of the metastable and main phases were determined. The impact of preliminary mechanical activation and of γ-irradiation on the macrokinetic parameters of the synthesis were studied experimentally in situ. It has been established that the impact of γ-irradiation on the mechanically activated powder mixture of the composition Ti 64 wt% + Al leads to a change in the thermal parameters of combustion: the maximum synthesis temperature and the burning rate decrease. The heating rate for the non-irradiated mixture is 204.8 K s−1 and that for the irradiated mixture is 81.6 K s−1. The dependences of mass fractions of the synthesized compounds on time and temperature were calculated from the stage of preheating until completion of the thermal explosion. A single-phase equilibrium product of the composition γ-(TiAl) is formed in γ-irradiated mechanically activated mixture when the system reaches maximum temperature. The synthesized product of the mechanically activated mixture without γ-irradiation contains 72% γ-(TiAl); TiAl3 (26%) and residual Ti (2%) are also observed.

Synthesis of Nanostructure MoSi2 Powder by Mechanically Assisted Self-Propagating High-Temperature Synthesis

2010 ◽  
Author(s):  
R. Meshkizadeh ◽  
H. Abdollahpour ◽  
A. Honarbakhsh-Raouf
Keyword(s):  
High Temperature ◽  
Ball Milling ◽  
Powder Mixture ◽  
Combustion Temperature ◽  
Combustion Method ◽  
Temperature Synthesis ◽  
Mixed Powder ◽  
Powder Mixtures ◽  
High Temperature Synthesis

Nanostructured MoSi2 powder has been successfully synthesized by Ball milling of Mo and Si powder mixtures and subsequent self-propagating high-temperature synthesis (SHS) process. It was observed that in comparison with the normally mixed powder, it could be easily ignited and higher combustion temperature was achieved. Based on XRD and SEM, it was confirmed that nanostructure MoSi2 powder could be prepared through self propagating combustion method from the mechanical activated powder mixture.

Features of Regularities of Ni3Al Intermetallic Compound High-Temperature Synthesis in a Powder Mixture (3Ni + Al) under Pressure

2018 ◽  
Vol 938 ◽  
pp. 41-45
Author(s):  
K.O. Akimov ◽  
E.N. Boyangin ◽  
Vladimir E. Ovcharenko
Keyword(s):  
High Temperature ◽  
Intermetallic Compound ◽  
Powder Mixture ◽  
Exothermic Reaction ◽  
Strength Properties ◽  
Grain Structure ◽  
Temperature Synthesis ◽  
Compound Formation ◽  
High Temperature Synthesis ◽  
Intermetallic Compound Formation

The results of investigation of the time and power parameters influence of high-temperature synthesis under pressure on the grain structure formation and strength properties of the Ni3Al intermetallic compound are presented and discussed. Dependences of the grain size in the intermetallic compound synthesized under pressure and its strength properties on the value of the preload on the initial powder mixture (3Ni + Al) and on the delay time of pressure application to the thermoreacting system were determined from the time of initiation of intermetallic compound formation volumetric exothermic reaction.

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