Effect of Ti Contents on the Microstructure and Mechanical Properties of Ni˗Al˗Ti System

2020 ◽  
Vol 991 ◽  
pp. 24-29
Author(s):  
Dhimas Wicaksono ◽  
Xiao Meng Zhu ◽  
Mohammad Sukri Mustapa ◽  
Sulis Yulianto ◽  
Ahmad Yunus Nasution ◽  
...  
Keyword(s):  
Vickers Microhardness ◽  
Combustion Process ◽  
Intermetallic Phases ◽  
External Heat ◽  
Temperature Synthesis ◽  
Mixed Powder ◽  
External Heat Source ◽  
High Temperature Synthesis ◽  
Ti Content ◽  
Heat Released

In this work, a ternary system prepared by Ni-Al-Ti mixed powder was synthesized using self-propagation high-temperature synthesis (SHS) process. The weight of the reactant was varied using 3%, 10%, 20% and 30% of the Ti content. The mixtures were compressed in a steel die to form compacted pellets, and subsequently ignited using an external heat source to initiate the combustion process. The synthesized products were characterized using SEM, EDS, and XRD, whereas the mechanical property of the product was measured using a Vickers microhardness test. The identification of the formed phase indicates that Ni-Al, Ti-Al and Ti-Ni systems were formed during the reaction. An increase of Ti content from 3% to 10% improves the density of the synthesized product. Further increase of Ti content to 20% results in the generation of cracks. The addition of Ti with 30% leads to the formation of a porous product. The heat released by the SHS process due to the formation of several intermetallic phases was responsible for the formation of defect products. The highest hardness of the product was achieved in the product prepared by 20% Ti content. However, the higher Ti content than 20% results in hardness reduction. This work shows that the content of 10% of Ti produced a dense and hard product.

Structure and Properties of Ni˗Al˗Ti Systems Formed by Combustion Synthesis

2020 ◽  
Vol 991 ◽  
pp. 44-50
Author(s):  
Tri Widodo Besar Riyadi
Keyword(s):  
Combustion Synthesis ◽  
Vickers Microhardness ◽  
Combustion Process ◽  
Wear Test ◽  
Intermetallic Phases ◽  
Structure And Properties ◽  
High Temperature Application ◽  
Intermetallic Materials ◽  
Temperature Application ◽  
Ti Content

Ni-Al-Ti system is one of the intermetallic systems that attract wide interest for high-temperature application. In this work, combustion synthesis was used to produce intermetallic materials prepared by Ni/Al with varied Ti content using 3%, 10%, 20%, and 30%. The reactant mixtures were compressed in a steel die to form compacted pellets. The ignition of the combustion process was conducted using an arch flame. Sequential tests of SEM, EDS, and XRD were conducted to characterize the microstructure of the synthesized products, whereas the mechanical properties of the product were measured using a Vickers microhardness test and wear test. The result shows that the phases formed in the product were dominated by Ni-Al and Ti-Ni systems. An increase in the Ti content from 3% to 20% increases the hardness. The formation of several intermetallic phases was responsible for the harder products. An increase of Ti content decreases the wear rate. This work shows that the content of 10% Ti can be used to achieve the optimized properties of hardness and wear resistance.

Study on Preparation of Ti Powder by Self-Propagating High-Temperature Synthesis (SHS) with Magnesiothermit Reductive Process

2008 ◽  
Vol 575-578 ◽  
pp. 1086-1092
Author(s):  
Peng Lin Zhang ◽  
Tian Dong Xia ◽  
Guo Dong Zhang ◽  
Li Jing Yan
Keyword(s):  
Reaction Rate ◽  
Combustion Temperature ◽  
Combustion Process ◽  
Green Compact ◽  
Reaction Products ◽  
Technological Parameters ◽  
Solid Reaction ◽  
Temperature Synthesis ◽  
High Temperature Synthesis ◽  
Ti Powder

The combustion process of Mg-TiO2 system was preliminarily investigated from three aspects of thermodynamics, reaction kinetics and the technological parameters. The result indicates that the adiabatic temperature of Mg-TiO2 system is between 2060K and 2140K because the major existent modalities of TiO2 is the rutile and anatase, this meets the empirical criterion that the SHS reaction will be self-sustaining; The solid-solid reaction occurs at about 767K; Ti powders can be produced only when the ratio between Mg and TiO2 arrives at 2.9:1; The higher the vacuum, the more complete the reaction; The combustion temperature arrives at its peak when the pressure of green compact arrives at 250MPa; the velocity of the combustion wave increases with the augmentation of the pressure of green compact. So the proper control of the technological parameters can change the reaction temperature, reaction rate and the components of reaction products.

Self-propagating high-temperature synthesis of the SiC

1986 ◽  
Vol 1 (2) ◽  
pp. 275-279 ◽  
Author(s):  
Osamu Yamada ◽  
Yoshinari Miyamoto ◽  
Mitsue Koizumi
Keyword(s):  
Particle Size ◽  
High Temperature ◽  
Exothermic Reaction ◽  
Experimental System ◽  
Ignition Process ◽  
Temperature Synthesis ◽  
High Temperature Synthesis ◽  
Effect Of Particle Size ◽  
Constituent Elements ◽  
Heat Released

Self-propagating high-temperature synthesis (SHS), also called combustion synthesis, is useful for fabricating numerous ceramics. In the case of SiC, heat released from the exothermic reaction is not sufficient to completely convert the mixed reactants of constituent elements into SiC in the usual nonadiabatic experimental system. This disadvantage could be overcome by a new ignition process called, the “direct passing method of electric current.” By using this method, stoichiometric fine SiC powder could be obtained rapidly and efficiently with low electric power. This paper also involves the effect of particle size of Si and C initial reactant powders on conversion efficiency into SiC and also on particle size of SiC powder fabricated by this method.

Combustion synthesis of mechanically activated powders in the Nb–Si system

2002 ◽  
Vol 17 (8) ◽  
pp. 1992-1999 ◽  
Author(s):  
Filippo Maglia ◽  
Chiara Milanese ◽  
Umberto Anselmi-Tamburini ◽  
Stefania Doppiu ◽  
Giorgio Cocco
Keyword(s):  
Mechanical Activation ◽  
Single Phase ◽  
Milling Time ◽  
Combustion Process ◽  
Temperature Wave ◽  
The Self ◽  
Temperature Synthesis ◽  
High Temperature Synthesis ◽  
Niobium Silicides ◽  
Reactant Powder

The effect of the mechanical activation of the reactants on the self-propagating high-temperature synthesis (SHS) of niobium silicides was investigated. SHS experiments were performed on reactant powder blends of composition Nb:Si = 1:2 and Nb:Si = 5:3 pretreated for selected milling times. A self-sustaining reaction could be initiated when a sufficiently long milling time was employed. At short milling times, the reactions self-extinguished or propagated in an unsteady mode. Combustion peak temperature, wave velocity, and product composition were markedly influenced by the length of the milling treatment. Single-phase products could be obtained for sufficiently long milling times. Observation of microstructural evolution in quenched reactions together with isothermal experiments allowed clarification of the mechanism of the combustion process and the role played by the mechanical activation of the reactants.

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.

Reverse burning phenomenon in self-propagating high-temperature synthesis

1998 ◽  
Vol 13 (6) ◽  
pp. 1626-1630 ◽  
Author(s):  
Jou-Hong Lee ◽  
Ai-Yi Lee ◽  
Chien-Chong Chen
Keyword(s):  
High Temperature ◽  
Combustion Synthesis ◽  
External Heat ◽  
The Other ◽  
Green Density ◽  
Temperature Synthesis ◽  
Green Pellet ◽  
High Temperature Synthesis

An interesting reverse burning phenomenon was observed during the combustion synthesis of zirconium-based materials. When an external heat was applied to one end of a green pellet, the ignition was initiated at the other end. Also, the ignition position, measured from the heated end, was proportional to the apparent green density of the compact. The possible explanations for this reverse burning phenomenon are discussed.

Microstructure and Adhesion of NiAl/Al and NiAl/Ni Coatings Formed by SHS Process

2014 ◽  
Vol 660 ◽  
pp. 185-189
Author(s):  
Tri Widodo Besar Riyadi ◽  
Tao Zhang ◽  
Sarjito
Keyword(s):  
High Temperature ◽  
Combustion Chamber ◽  
Induction Heating ◽  
Steel Substrate ◽  
Intermetallic Phases ◽  
Temperature Synthesis ◽  
Argon Gas ◽  
High Temperature Synthesis

The objective of thiswork was to investigate the microstructure and adhesion of NiAl coating whichformed by self propagation high temperature synthesis (SHS) process. Ni/Almixture and an underlayer material which used Ni and Al were compacted to forma bilayer pellet and subsequently put on a steel substrate. The Ni/Al reactionwas ignited using induction heating in a combustion chamber of argon gas. Themorphology and microstructure of the products were observed using SEM and XRD.The results showed that further reactions between NiAl coating and underlayermaterials formed several intermetallic phases. The role of Al and Ni underlayeron the microstructure, porosity and the adhesion between coating and thesubstrate was observed.

Self-propagating high-temperature synthesis of nano-sized titanium carbide powder

2002 ◽  
Vol 17 (11) ◽  
pp. 2859-2864 ◽  
Author(s):  
H. H. Nersisyan ◽  
J. H. Lee ◽  
C. W. Won
Keyword(s):  
Sodium Chloride ◽  
Titanium Carbide ◽  
Combustion Temperature ◽  
Combustion Process ◽  
Carbide Powder ◽  
Primary Carbide ◽  
Temperature Synthesis ◽  
Ultrafine Structure ◽  
High Temperature Synthesis ◽  
Carbon System

The combustion process of a titanium–carbon system with sodium chloride as an inert diluent was investigated. The combustion laws and microstructure of final products according to diluent content were obtained. It was shown that sodium chloride not only decreases combustion temperature but also makes effective protective shells around primary carbide crystals and keeps this ultrafine structure up to the end of combustion. As a result, nano-sized titanium carbide powders were successfully obtained.

Influence of Factors Affecting the Parameters of Combustion of Aluminum Nanopowders in the Bulk Layer

2019 ◽  
Vol 970 ◽  
pp. 257-264
Author(s):  
Alexander I. Sechin ◽  
Olga B. Nazarenko ◽  
Yuliya A. Amelkovich ◽  
Andrey A. Sechin
Keyword(s):  
Thermal Explosion ◽  
Substrate Surface ◽  
Combustion Process ◽  
Temperature Synthesis ◽  
Factors Affecting ◽  
Bulk Layer ◽  
Second Stage ◽  
High Temperature Synthesis ◽  
Surface Burning ◽  
Synthesis Of Nanomaterials

The article presents the study of factors affecting the ability to control the self-propagating high-temperature synthesis of nanomaterials. It is established that there are two steps in the combustion process nanomaterial: burning of surface layer and deep combustion area, which can be considered as the thermal explosion. It was found that the surface roughness and the thermal conductivity of the substrate do not affect the combustion front velocity. The presence of glass transition on the substrate surface also does not affect the velocity of the front. It was established that the parameters of the deep combustion area do not depend on the nature of the initiation of combustion, being the second stage of the development of combustion; in all cases this stage is characterized by the same parameters. When varying the type of ignition source, the length of the surface burning front can vary up to 33%. The time of induction of a thermal explosion increases when the bulk layer of powder ignites from above.

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