The Obtaining of the Intermetallic Compounds of Ni-Al System by Self-Propagating High Temperature Synthesis and Thermal Explosion

2015 ◽  
Vol 1114 ◽  
pp. 135-142
Author(s):  
Mihai Cojocaru ◽  
Florică Tudose
Keyword(s):  
High Temperature ◽  
Intermetallic Compounds ◽  
Thermal Explosion ◽  
Melting Temperature ◽  
Aerospace Industry ◽  
Point Of View ◽  
Temperature Synthesis ◽  
Practical Point ◽  
High Temperature Synthesis

The intermetallic compounds (IMC) of Ni-Al system exhibit interest both by theoretical and practical point of view: theoretically, due to particular aspects in relation to their synthesis and practically, due to their qualities that recommend them for the top industries such as, for example, the aerospace industry. In this paper are shown the results of researches on obtaining of high temperature compounds of Ni-Al system by self-propagating high temperature synthesis and thermal explosion, through the initiation of process at a temperature below the melting temperature of the easy fusible component.

Fabrication of cellular NiTi intermetallic compounds

2000 ◽  
Vol 15 (1) ◽  
pp. 10-13 ◽  
Author(s):  
Bing-Yun Li ◽  
Li-Jian Rong ◽  
Yi-Yi Li ◽  
V. E. Gjunter
Keyword(s):  
High Temperature ◽  
Intermetallic Compounds ◽  
Open Porosity ◽  
Cellular Structure ◽  
Temperature Synthesis ◽  
High Temperature Synthesis ◽  
Preheating Temperature ◽  
Porosity Ratio

Self-propagating high-temperature synthesis (SHS) has been successfully developed for the fabrication of cellular NiTi intermetallic compounds, which have an open cellular structure with about 60 vol% porosity and more than 95% open-porosity ratio. The SHS reactions lead to the formation of TiNi, Ti2Ni, Ni3Ti, and Ni4Ti3 intermetallics. The SHS process can be controlled by regulating the preheating temperature, which has effects on the phase amount and the shape as well as macrodistribution of pores in the products.

Self-Propagating High-Temperature Synthesis of Intermetallic Compounds

1988 ◽  
pp. 557-562
Author(s):  
Yoshinari Kaieda ◽  
Minoru Otaguchi ◽  
Osamu Odawara ◽  
Morihiko Nakamura ◽  
Tadashi Oie ◽  
...  
Keyword(s):  
High Temperature ◽  
Intermetallic Compounds ◽  
Temperature Synthesis ◽  
High Temperature Synthesis

Kinetics of mechanically activated high temperature synthesis of Ni3Al in the thermal explosion mode

2011 ◽  
Vol 19 (7) ◽  
pp. 833-840 ◽  
Author(s):  
Valery Yu. Filimonov ◽  
Michail A. Korchagin ◽  
Evgeny V. Smirnov ◽  
Alexander A. Sytnikov ◽  
Vladimir I. Yakovlev ◽  
...  
Keyword(s):  
High Temperature ◽  
Thermal Explosion ◽  
Temperature Synthesis ◽  
High Temperature Synthesis ◽  
Kinetics Of

Reaction mechanism of self-propagating high-temperature synthesis reaction in the Ni–Ti–B4C system

2008 ◽  
Vol 23 (9) ◽  
pp. 2519-2527 ◽  
Author(s):  
Y.F. Yang ◽  
H.Y. Wang ◽  
R.Y. Zhao ◽  
Y.H. Liang ◽  
Q.C. Jiang
Keyword(s):  
High Temperature ◽  
Reaction Mechanism ◽  
Intermetallic Compounds ◽  
Eutectic Point ◽  
The Self ◽  
Mutual Diffusion ◽  
Synthesis Reaction ◽  
Temperature Synthesis ◽  
Early Appearance ◽  
High Temperature Synthesis

The SHS reaction in the Ni–Ti–B4C system starts with the formation of Ni–Ti and Ni–B intermetallic compounds from the solid interacted reaction among the reactants and, subsequently, the formation of Ni–Ti and Ni–B liquid at the eutectic point. Meanwhile, some C atoms from the reaction between Ni and B4C can dissolve into Ni–Ti liquid to form TiC. The heat generated from these reactions can promote the mutual diffusion of Ni–Ti–C and Ni–B liquid and simultaneously accelerate the formation of Ni–Ti–C–B liquid. Finally the precipitation of TiC and TiB2 occur when the C and B atoms in the liquid become supersaturated. The addition of Ni not only promotes the occurrence of the self-propagating high temperature synthesis (SHS) reaction by forming Ni–Ti liquid, but also accelerates the SHS reaction by forming Ni–B liquid and dissociative C. The early appearance of dissociative C from the reaction between Ni and B4C causes the formation of TiC prior to that of TiB2.

Formation of M5Si3 Type Si-Ti-Zr System Intermetallic Compounds by Pulse Electric Current Sintering with Self-Propagating High Temperature Synthesis

2014 ◽  
Vol 617 ◽  
pp. 68-71
Author(s):  
Yukinori Ikarashi ◽  
Makoto Nanko ◽  
Kozo Ishizaki
Keyword(s):  
High Temperature ◽  
Electric Current ◽  
Intermetallic Compounds ◽  
Vacuum Pressure ◽  
Temperature Synthesis ◽  
Pulse Electric Current ◽  
High Temperature Synthesis ◽  
Pressure Axis ◽  
Pulse Electric ◽  
Full Conversion

Pulse electric current sintering (PECS) is applied to synthesis M5Si3 type Si-Ti-Zr system intermetallic compounds, Si3TixZr(5-x) x=0-5, directly from raw powders of silicon, titanium and zirconium. Almost full conversion to Si3TixZr(5-x) are achieved by PECS method with self-propagating high temperature synthesis (SHS) reaction. The adiabatic temperatures are susceptible to sintering behaviors such as vacuum pressure in chamber and displacement of pressure axis on the PECS process. The large quantities of gases are released in Zr-rich samples. The bulk shapes with almost dense samples are obtained at Ti-rich samples.

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.

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