Effect of mechanical activation of reagents’ mixture on the high-temperature synthesis of Al2O3–TiB2 composite powder

2011 ◽  
Vol 104 (3) ◽  
pp. 1063-1070 ◽  
Author(s):  
R. Taherzadeh Mousavian ◽  
S. Sharafi ◽  
M. R. Roshan ◽  
M. H. Shariat
Keyword(s):  
High Temperature ◽  
Mechanical Activation ◽  
Composite Powder ◽  
Temperature Synthesis ◽  
High Temperature Synthesis

Self-Propagating High-Temperature Synthesis of Si-SiC Composite Powder

2016 ◽  
Vol 675-676 ◽  
pp. 623-626 ◽  
Author(s):  
Tawat Chanadee ◽  
Sutham Niyomwas
Keyword(s):  
High Temperature ◽  
Composite Powder ◽  
Rice Husk Ash ◽  
Argon Atmosphere ◽  
Composite Powders ◽  
Temperature Synthesis ◽  
X Ray ◽  
High Temperature Synthesis ◽  
Silicon Silicon

Silicon-silicon carbide (Si-SiC) composite powders were synthesized by in-situ self- propagating high-temperature synthesis using rice husk ash (RHA)/carbon/Mg as precursors in argon atmosphere. The as-SHS powders were leached by two leaching steps. The microstructure and chemical composition of the obtained Si-SiC composite powders were examined using scanning electron microscope (SEM) and x-ray diffractometer (XRD), respectively.

scholarly journals Mechanical activation assisted self-propagating high- temperature synthesis of Si/Al2O3composites

2009 ◽  
Vol 144 ◽  
pp. 012080 ◽  
Author(s):  
T F Grigoryeva ◽  
Yu D Kaminsky ◽  
M R Sharafutdinov ◽  
T L Talako ◽  
I A Vorsina ◽  
...  
Keyword(s):  
High Temperature ◽  
Mechanical Activation ◽  
Temperature Synthesis ◽  
High Temperature Synthesis

Obtaining the Nanostructured Nitride Composition TiN-BN Powder by the Self-Propagating High-Temperature Synthesis from the Azide KBF4-NaN3-Na2TiF6 and "NH4BF4-NaN3-Na2TiF6 Systems

2014 ◽  
Vol 698 ◽  
pp. 507-512
Author(s):  
Irina Kerson ◽  
Ljudmila Shiganova
Keyword(s):  
High Temperature ◽  
Boron Nitride ◽  
Sodium Azide ◽  
Composite Powder ◽  
The Self ◽  
Nanosized Powder ◽  
Temperature Synthesis ◽  
High Temperature Synthesis ◽  
Halide System ◽  
One Step

This paper presents the results of a study on the preparation of nanostructured nitride composition TiN-BN in the boron halide - sodium azide - titanium halide system by the azide SHS technology. SHS-Az technology makes it possible to produce powders having the desired properties, only in one step, without blending separately prepared powders of titanium nitride and boron nitride, and to obtain the final product in the form of micro-and nanosized powder nitride compositions TiN-BN by using complex halides of titanium and boron. Thus, the composite powder TiN and BN obtained from the KBF4-NaN3-Na2TiF6» and «NH4BF4-NaN3-Na2TiF6 systems can be classified as a nanostructured powder (nanopowder).

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.

Ultrafine Si/Al2O3 composites obtained by combining methods of mechanical activation and self-propagating high-temperature synthesis

2010 ◽  
Vol 46 (1) ◽  
pp. 36-40 ◽  
Author(s):  
T. F. Grigorieva ◽  
T. L. Talako ◽  
M. R. Sharafutdinov ◽  
Yu. D. Kaminskii ◽  
I. A. Vorsina ◽  
...  
Keyword(s):  
High Temperature ◽  
Mechanical Activation ◽  
Temperature Synthesis ◽  
High Temperature Synthesis ◽  
Combining Methods
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