Synthesis of Ti3SiC2 via Modified-SHS System through Arc Melting

2011 ◽  
Vol 239-242 ◽  
pp. 2128-2131 ◽  
Author(s):  
Julie Juliewatty Mohamed ◽  
Phua Chee Hung ◽  
Zainal Arifin Ahmad
Keyword(s):  
Raw Materials ◽  
Melting Time ◽  
Cylindrical Shape ◽  
Inter Metallic Compound ◽  
Temperature Synthesis ◽  
Arc Melting ◽  
High Temperature Synthesis ◽  
Sem Micrograph ◽  
The Common ◽  
Titanium Silicon

Inter-metallic compound of Ti3SiC2was produced via modified-SHS (self-propagating high temperature synthesis). Elemental powders of titanium, silicon and graphite were weighed according to their stoichiometric ratios (3:1:2) respectively. These powders were ball milled for 1 hour, then compacted into cylindrical shape. Synthesis of Ti3SiC2was carried out by using arc melting method. The effect of different arc melting time of 10, 30 and 60 seconds was studied. Phase formation and microstructure were analyzed by using XRD and SEM. The formation of Ti3SiC2was confirmed by XRD, and the SEM micrograph shows that the grain is in needle shape. XRD result also shows that the impurities are present in all the samples. TiC appeared to be the common and dominant impurity in all samples, with relatively low intensities in Ti5Si3and TiSi2phases. Some raw materials phase was still existed in sample arc melted for 10 and 30 seconds. Hence, it can be deduced that the raw materials had not yet fully taking part in the formation of Ti3SiC2.

Formation of Titanium Silicon Carbide (Ti3SiC2) via Modified Self-Propagating High Temperature Synthesis (SHS) System through Arc Melting

2012 ◽  
Vol 620 ◽  
pp. 304-308
Author(s):  
Norlailatullaili Mazuki ◽  
Julie Juliewatty Mohamed ◽  
Zainal Arifin Ahmad
Keyword(s):  
X Ray Diffraction ◽  
Temperature Synthesis ◽  
Powder Mixtures ◽  
Titanium Silicon Carbide ◽  
X Ray ◽  
Al Content ◽  
Arc Melting ◽  
High Temperature Synthesis ◽  
Titanium Silicon ◽  
Synthesized Materials

Ti3SiC2compound was synthesized from the starting powder mixtures of 3Ti/1.2Si/2C/xAl (x=0, 0.1, 0.2, 0.3) by using arc melting method. The effect of Al on the Ti3SiC2formation was studied. X-ray diffraction and scanning electron microscopy were used to characterize the synthesized materials. It was found that the addition of Al increased the purity of Ti3SiC2. Whenx=0.2, Ti3SiC2content in the final product reached 67% after being ball milled for 24 hours. However, excessive Al reduced the content of Ti3SiC2. In addition, the density of the final product decreased with increasing of Al content. It was revealed that addition of Al in the starting powders can increase the final product purity.

The Use of Combustion Reactions for Processing Mineral Raw Materials: Metallothermy and Self-propagating High-temperature Synthesis (Review)

2015 ◽  
Vol 47 (1) ◽  
pp. 58-66 ◽  
Author(s):  
Farit Kh. Urakaev ◽  
Kenzhebek A. Akmalaev ◽  
Eljan S. Orynbekov ◽  
Beykut D. Balgysheva ◽  
Dinar N. Zharlykasimova
Keyword(s):  
High Temperature ◽  
Raw Materials ◽  
Temperature Synthesis ◽  
Mineral Raw Materials ◽  
High Temperature Synthesis

Effect of CaF2 in Precursors on Steel Pipe Lined Fe-Al Intermetallic-TiB2-Al2O3 Composite Coating by Centrifugal-SHS Process

2012 ◽  
Vol 488-489 ◽  
pp. 468-472 ◽  
Author(s):  
Pajaree Kerdkool ◽  
Sutham Niyomwas
Keyword(s):  
Energy Minimization ◽  
Standard Gibbs Energy ◽  
Raw Materials ◽  
Steel Pipe ◽  
X Ray Diffraction ◽  
Temperature Synthesis ◽  
Minimization Method ◽  
X Ray ◽  
High Temperature Synthesis ◽  
Centrifugal Shs

Steel pipe lined Fe-Al intermetallic-TiB2-Al2O3composite were prepared by centrifugal-self-propagating high temperature synthesis (centrifugal-SHS) process from FeTiO3, B2O3, Fe2O3, Al and CaF2as raw materials. The standard Gibbs energy minimization method was used to calculate the equilibrium compositions of the reacting species. The effect of adding CaF2to the precursors on the result product were investigated. The phase separation between less porosity Fe-Al intermetallics-TiB2with Al2O3layer were affected greatly by adding CaF2. The phase compositions and morphology were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM) couple with energy dispersive X-ray (EDX), respectively.

scholarly journals The application of self-propagating hightemperature synthesis to obtain a protective-strengthening alumina-silica coatings

2019 ◽  
Vol 55 (2) ◽  
pp. 240-246
Author(s):  
R. Yu. Popov ◽  
E. O. Bohdan ◽  
E. M. Dyatlova ◽  
M. V. Komar
Keyword(s):  
High Temperature ◽  
Raw Materials ◽  
Operating Temperature ◽  
Thermal Unit ◽  
Ceramic Factory ◽  
Coating Structure ◽  
Temperature Synthesis ◽  
Silica Coatings ◽  
Hardening Coatings ◽  
High Temperature Synthesis

This article shows the possibility of using the method of self-propagating high-temperature synthesis to obtain protective and hardening coatings for the lining of various thermal installations. The development of compositions of ceramic masses for the production of SHS coatings was carried out on the basis of aluminum powder, clay raw materials, exhausting and fluxing components as well as mineralizing additives. The prepared suspension including pre-prepared and thoroughly mixed raw materials was applied with a brush or a spray gun onto the previously cleaned and moistened surface of an aluminosilicate refractory. The firing of the coating was carried out in accordance with the mode of removing the thermal unit at the operating temperature. The temperature of the initiation of the SHS process, previously established using differential thermal analysis, was in the range of 570–720 °C and depended on the chemical composition of the charge. It has been established that the presence of crystalline phases of silica, corundum, hematite and a number of solid solutions (mainly calcium and sodium aluminosilicates) in the coating structure provides the necessary combination of the thermomechanical and thermophysical characteristics of the coatings. On the basis of the conducted research, the expediency of applying the technology of self-propagating high-temperature synthesis for the production of protective and hardening coatings on the lining of thermal units is demonstrated, which is confirmed by industrial tests in the conditions of the Minsk Ceramic Factory OJSC «Keramin».

scholarly journals Magnesiothermal synthesis and consolidation of multicomponent powder ceramics in the Zr–Si–Mo–B system

2019 ◽  
pp. 30-41
Author(s):  
A. N. Astapov ◽  
Yu. S. Pogozhev ◽  
M. V. Lemescheva ◽  
S. I. Rupasov ◽  
V. I. Vershinnikov ◽  
...  
Keyword(s):  
Composite Powder ◽  
Raw Materials ◽  
Thermal Reduction ◽  
Initial Reaction ◽  
Temperature Synthesis ◽  
High Temperature Synthesis ◽  
Burning Rates ◽  
Polyhedral Shape ◽  
High Degree ◽  
Magnesium Thermal Reduction

The work aims to obtain composite powder ceramics based on ZrB2–ZrSi2–MoSi2 by the self-propagating high-temperature synthesis (SHS) according to the scheme of magnesium thermal reduction from oxide raw materials, as well as its subsequent consolidation by hot pressing (HP). The combustion of the reaction mixtures is characterized by rather high adiabatic temperatures in the range of 2060 to 2120 K and burning rates in the range of 8,3 to 9,4 g/s. The yield of the end product with magnesiothermal reduction is 34–38 %. The resulting powder contains 13–47 % ZrB2, 21–70 % ZrSi2, 2–32 % ZrSi, and 10–18 % MoSi2 depending on the composition of the initial reaction mixture. It is characterized by high structural homogeneity and consists of composite particles of polyhedral shape with an average about 8 microns in size. The structure of ceramics consolidated by the HP method from SHS powder is homogeneous and includes ZrB2 needle grains distributed in a ZrSi2 matrix, MoSi2 inclusions of various morphology and ZrSiO4 silicate, distributed along the grain boundaries of ZrSi2. The samples obtained by HP are characterized by a high degree of homogeneity of the chemical composition and a residual porosity of 2,5–7,4 %.

scholarly journals Preparation of AlB12 Powder by Self-Propagating High-Temperature Synthesis (SHS)

2021 ◽  
Author(s):  
Chao Wang ◽  
Xiaoming Cao ◽  
Mengge Dong ◽  
Lu Zhang ◽  
Jianxing Liu ◽  
...  
Keyword(s):  
High Temperature ◽  
Phase Analysis ◽  
Raw Materials ◽  
The Self ◽  
Temperature Synthesis ◽  
Root Cause ◽  
High Temperature Synthesis

<p>Self-propagating high-temperature synthesis (SHS) process is used to prepare AlB<sub>12</sub>. The phase analysis results of preparing AlB<sub>12</sub> with Al and B<sub>2</sub>O<sub>3</sub> as raw materials show that: under air and argon conditions, the self-propagating and acid-washed self-propagating powders all have α-Al<sub>2</sub>O<sub>3</sub> impurities; Mg, Al and B<sub>2</sub>O<sub>3</sub> are used as raw materials. The phase analysis results of the preparation of AlB<sub>12</sub> show that under argon conditions, the self-propagating and acid-washed self-propagating powder has unremovable MgAl<sub>2</sub>O<sub>4</sub> impurities; the root cause of the low purity of AlB<sub>12</sub> prepared by the self-propagating method is that there are unremovable impurities exist.</p>

scholarly journals Effects of different Sn contents on formation of Ti2SnC by self-propagating high-temperature synthesis method in Ti-Sn-C and Ti-Sn-C-TiC systems

2014 ◽  
Vol 32 (4) ◽  
pp. 696-701 ◽  
Author(s):  
Hong-Yan Sun ◽  
Xin Kong ◽  
Wei Sen ◽  
Zhong-Zhou Yi ◽  
Bao-Sen Wang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Raw Materials ◽  
Synthesis Method ◽  
Combustion Products ◽  
Molar Ratio ◽  
X Ray Diffraction ◽  
Temperature Synthesis ◽  
X Ray ◽  
High Temperature Synthesis ◽  
Scanning Electron

AbstractEffect of different Sn contents on combustion synthesis of Ti2SnC was studied using elemental Ti, Sn, C and TiC powders as raw materials in the Ti-Sn-C and Ti-Sn-C-TiC system, in which the molar ratio of Ti/C was set as 2:1. The reaction mechanism for the formation of Ti2SnC was also investigated. The results showed that the amount of Ti2SnC in combustion products firstly increased with increasing of Sn content (0.6 to 0.8 mol), and then decreased with further increasing of Sn content (1.0 to 1.2 mol). Upon addition of 15 % TiC instead of Ti and C, the optimum addition of Sn decreased to 0.7 mol and a higher purity of Ti2SnC was obtained. The Ti2SnC powders were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD).

scholarly journals A study of ceramic-lined composite steel pipes prepared by SHS centrifugal-thermite process

2016 ◽  
Vol 48 (1) ◽  
pp. 81-86 ◽  
Author(s):  
Yuxin Li ◽  
Letao Jiang ◽  
Qing Lu ◽  
Peikang Bai ◽  
Bin Liu ◽  
...  
Keyword(s):  
Phase Separation ◽  
High Temperature ◽  
Transition Layer ◽  
Raw Materials ◽  
Ceramic Layer ◽  
Steel Pipe ◽  
Temperature Synthesis ◽  
Al2o3 Ceramic ◽  
Steel Pipes ◽  
High Temperature Synthesis

Al2O3 ceramic-lined steel pipe was produced by self-propagating high-temperature synthesis centrifugal thermite process (SHS C-T process) from Fe2O3 and Al as the raw materials. The composition, phase separation and microstructures were investigated. The result showed the ceramic lined pipe is composed of the three main layers of various compositions, which were subsequently determined to be Fe layer, the transition layer and the ceramic layer. Fe layer is composed of austenite and ferrite, the transition layer consisted of Al2O3 ceramic and Fe, the ceramic layer consisted of the dendritic-shaped Al2O3 and the spinel-shaped structured FeAl2O4.

scholarly journals Preparation of AlB12 Powder by Self-Propagating High-Temperature Synthesis (SHS)

2021 ◽  
Author(s):  
Chao Wang ◽  
Xiaoming Cao ◽  
Mengge Dong ◽  
Lu Zhang ◽  
Jianxing Liu ◽  
...  
Keyword(s):  
High Temperature ◽  
Phase Analysis ◽  
Raw Materials ◽  
The Self ◽  
Temperature Synthesis ◽  
Root Cause ◽  
High Temperature Synthesis

<p>Self-propagating high-temperature synthesis (SHS) process is used to prepare AlB<sub>12</sub>. The phase analysis results of preparing AlB<sub>12</sub> with Al and B<sub>2</sub>O<sub>3</sub> as raw materials show that: under air and argon conditions, the self-propagating and acid-washed self-propagating powders all have α-Al<sub>2</sub>O<sub>3</sub> impurities; Mg, Al and B<sub>2</sub>O<sub>3</sub> are used as raw materials. The phase analysis results of the preparation of AlB<sub>12</sub> show that under argon conditions, the self-propagating and acid-washed self-propagating powder has unremovable MgAl<sub>2</sub>O<sub>4</sub> impurities; the root cause of the low purity of AlB<sub>12</sub> prepared by the self-propagating method is that there are unremovable impurities exist.</p>

scholarly journals Combustion Synthesis of Composition Ferroalloys

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2117
Author(s):  
Mansur Ziatdinov ◽  
Alexander Zhukov ◽  
Vladimir Promakhov
Keyword(s):  
High Temperature ◽  
Raw Materials ◽  
Ferroalloy Production ◽  
Production Cycle ◽  
Practical Implementation ◽  
Exchange Reactions ◽  
Temperature Synthesis ◽  
New Approach ◽  
High Temperature Synthesis ◽  
Steel Alloying

The main objective of this paper is to present results of the research in the development of a specialized self-propagating high-temperature synthesis (SHS) technology for ferroalloy composites, as applied to steelmaking. The problem of creating such a production cycle has been solved by developing a new approach to the practical implementation of self-propagating high-temperature synthesis, as applied to metallurgy. The metallurgical variation of SHS is based on the use of different metallurgic alloys (including waste in the form of dust from ferroalloy production) as basic raw materials in the new process. Here, the process of synthesis by combustion is realized through exothermic exchange reactions. The process produces a composite, based on inorganic compositions with a bond of iron and/or alloy based on iron. It has been shown that in terms of the aggregate state of initial reagents, metallurgical SHS processes are either gasless or gas-absorbing. Combustion regimes significantly differ when realized in practice. To organize the metallurgical SHS process in weakly exothermic systems, different variations of the thermal trimming principle are used. In the present study, self-propagating high-temperature synthesis of ferrovanadium nitride, which is widely used in steel alloying, was investigated. It has been shown that the phase composition of the initial alloy has a profound impact on the regular patterns in ferrovanadium combustion in nitrogen and on the mechanism itself. During the nitriding of σ-(Fe-V), process activation is taking place. The activation is due to the transformation of the intermetallide into an α-solid solution, when the temperature of phase transition is reached (~1200 °C). The composite structure of the products of ferrovanadium is nitriding by the fusion of particles-droplets composed of molten Fe and solid VN.

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