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Online since: July 2017
Authors: Aleksandr P. Amosov, Evgeniy I. Latukhin, Vladislav A. Novikov, P.A. Petrov, E.A. Amosov, A.Yu. Illarionov
The MAX-phases are produced by different methods, among which the method of self-propagating high-temperature synthesis (SHS) is the simplest and least energy-consuming.
However, carrying out the combustion process using the initial mixture of powders of the composition 3Ti+1.2Si+2B, grinding the SHS product to a size of 50-150 µm and subsequent electron-beam deposition by welding of the SHS powder did not confirm the existence of the MAX-phase Ti3SiB2 both in the SHS powder and in the deposited coating with thickness of 3-4 mm [9].
The products of SHS reactions were also investigated by scanning electron microscope JEOL-6390A.
Latukhin, Synthesis of MAX-phase of titanium silicon carbide (Ti3SiC2) as a promising electric contact material by SHS pressing method, Appl.
SHS, 23 (4) (2014) 216–220
However, carrying out the combustion process using the initial mixture of powders of the composition 3Ti+1.2Si+2B, grinding the SHS product to a size of 50-150 µm and subsequent electron-beam deposition by welding of the SHS powder did not confirm the existence of the MAX-phase Ti3SiB2 both in the SHS powder and in the deposited coating with thickness of 3-4 mm [9].
The products of SHS reactions were also investigated by scanning electron microscope JEOL-6390A.
Latukhin, Synthesis of MAX-phase of titanium silicon carbide (Ti3SiC2) as a promising electric contact material by SHS pressing method, Appl.
SHS, 23 (4) (2014) 216–220
Online since: October 2007
Authors: Hong Yu Zhuang, Xue Min Pan
Active Ti atoms and catalyzing H atoms released by TiH2 thermal
decomposition cause critical reacting temperature of the SHS decreasing.
The combustion specimens were machined with a grinding machine.
Using the TGA/DTA 851 analyze the DSC curves of SHS process.
XRD analysis is undertaken to identify present the crystal phases after SHS.
Characteristic of the SHS technology (quick heating, fast cooling) lead bubble not to growth and merger.
The combustion specimens were machined with a grinding machine.
Using the TGA/DTA 851 analyze the DSC curves of SHS process.
XRD analysis is undertaken to identify present the crystal phases after SHS.
Characteristic of the SHS technology (quick heating, fast cooling) lead bubble not to growth and merger.
Online since: February 2007
Authors: Zheng Guang Zou, Jin Li Li, Yi Wu
In this paper natural mineral ilmenite, graphite and Al are used
as raw materials for synthesizing TiC-Al2O3/Fe composites by SHS.
The powders were dry mixed in a polyethylene bottle under an Ar atmosphere for 24h using stainless steel grinding medium.
The pellet was loaded in a SHS furnace filled with an Ar atmosphere for synthesis and ignition was by a plate w-coil.
Yuan: Research progress in SHS technology (Publishing House of Wuhan University of Technology, China1994)
SHS Vol. 4 (1995), pp. 43
The powders were dry mixed in a polyethylene bottle under an Ar atmosphere for 24h using stainless steel grinding medium.
The pellet was loaded in a SHS furnace filled with an Ar atmosphere for synthesis and ignition was by a plate w-coil.
Yuan: Research progress in SHS technology (Publishing House of Wuhan University of Technology, China1994)
SHS Vol. 4 (1995), pp. 43
Online since: August 2012
Authors: Chun Hung Lai, Shyan Lung Chung
In this category of the SHS method, since
FIG. 1.
To obtain AlN powder, the product must go through crushing and grinding processes and the particle size is consequently determined by the grinding operation.
(Due to limitation of grinding, the AlN powder thus obtained is typically in micrometer size range.
A typical SEM photograph of the AlN after grinding.
SHS Vol. 6 (1997), p. 411
To obtain AlN powder, the product must go through crushing and grinding processes and the particle size is consequently determined by the grinding operation.
(Due to limitation of grinding, the AlN powder thus obtained is typically in micrometer size range.
A typical SEM photograph of the AlN after grinding.
SHS Vol. 6 (1997), p. 411
Online since: October 2006
Authors: Frédéric Bernard, Eric Gaffet, Sébastien Paris
For example, the optimum milling time depends on the type of mill, size of the grinding
medium and, the ball-to-powder ratio, etc.
a) b) Fig.6: SEM observations a) Fe/Al agglomerate before SHS reaction and b) identical FeAl intermetallic agglomerate after SHS.
In addition, the SHS experiments of mechanical alloyed Ni-Si powders revealed that MA is essential for allowing SHS processing at room temperature [20].
Indeed, the increase of the contact surface between reactants on the nanometric scale can improve the SHS reaction compared with the classical SHS process.
SHS, 10 (2) (2001), p.109
a) b) Fig.6: SEM observations a) Fe/Al agglomerate before SHS reaction and b) identical FeAl intermetallic agglomerate after SHS.
In addition, the SHS experiments of mechanical alloyed Ni-Si powders revealed that MA is essential for allowing SHS processing at room temperature [20].
Indeed, the increase of the contact surface between reactants on the nanometric scale can improve the SHS reaction compared with the classical SHS process.
SHS, 10 (2) (2001), p.109
Online since: February 2016
Authors: Vladislav A. Novikov, George Bichurov, Ljudmila Shiganova, Irina Kerson, Aleksandr P. Amosov
As a result of a joint grinding of boric acid, urea CO(NH2)2 with the AlN powder in alcohol medium in a ball mill, the deposition of boric acid and urea on the AlN particles was made.
The aim of this work was to study the possibility of obtaining the composite nanopowder AlN-BN by azide SHS technology (SHS-Az) with the use of halide salts of Al and B elements as precursors of these elements.
The assembled structure was mounted on the subject shelf of a SHS-Az laboratory reactor of a constant pressure with a volume of 4.5 liters.
Fig. 3 shows the morphology of the particles of the final product of the SHS-Az technology.
Conclusion The possibility of obtaining the composite nanopowder AlN-BN by azide SHS technology (SHS-Az) with the use of powder mixtures of NaN3 and halide salts AlF3, Na3AlF6, KBF4 and NH4BF4 as precursors of Al and B elements was investigated.
The aim of this work was to study the possibility of obtaining the composite nanopowder AlN-BN by azide SHS technology (SHS-Az) with the use of halide salts of Al and B elements as precursors of these elements.
The assembled structure was mounted on the subject shelf of a SHS-Az laboratory reactor of a constant pressure with a volume of 4.5 liters.
Fig. 3 shows the morphology of the particles of the final product of the SHS-Az technology.
Conclusion The possibility of obtaining the composite nanopowder AlN-BN by azide SHS technology (SHS-Az) with the use of powder mixtures of NaN3 and halide salts AlF3, Na3AlF6, KBF4 and NH4BF4 as precursors of Al and B elements was investigated.
Online since: December 2012
Authors: Niyomwas Sutham, Singsarothai Saowanee, Vishnu Rachpech
The steel substrate was coated by Fe-based composite using self-propagating high-temperature synthesis (SHS) reaction of reactant coating paste.
Recently, MMCs coating of Ni3Si-based composite [12] and TiC reinforced metal matrix composite [13] were prepared by SHS route.
In this work, Fe-base composite coating was fabricated via SHS method on a steel substrate.
The powders were weighted according to the reaction showed in Eq. 1-3 and mixed by grinding machine for 3 hrs for preparing the green paste.
Results and Discussion In this study Fe2O3, Al2O3, and Al were used as precursors for the aluminothermal reaction by SHS.
Recently, MMCs coating of Ni3Si-based composite [12] and TiC reinforced metal matrix composite [13] were prepared by SHS route.
In this work, Fe-base composite coating was fabricated via SHS method on a steel substrate.
The powders were weighted according to the reaction showed in Eq. 1-3 and mixed by grinding machine for 3 hrs for preparing the green paste.
Results and Discussion In this study Fe2O3, Al2O3, and Al were used as precursors for the aluminothermal reaction by SHS.
Online since: September 2018
Authors: Dmitry Wagner, Olga Dotsenko, Kirill Frolov, Veronika Dotsenko, Dmitry Aksentev
The SHS has been conducted at the same conditions, which is described in the article [9].
(1) After that the components were mixed by grinding in a porcelain mortar.
Barium hexaferrite with W-type composition was synthesized in following regime: SHS with mechanical post-activation of the product for 40 min for the grinding body mass to the powder mass in the ratio 10:1 that corresponded to a milling process power of 40g (No.1).
The temperature dependence of the real permeability for SHS W-type hexaferrites.
Conclusions The W-type hexaferrites were synthesized using a ceramic technique and SHS.
(1) After that the components were mixed by grinding in a porcelain mortar.
Barium hexaferrite with W-type composition was synthesized in following regime: SHS with mechanical post-activation of the product for 40 min for the grinding body mass to the powder mass in the ratio 10:1 that corresponded to a milling process power of 40g (No.1).
The temperature dependence of the real permeability for SHS W-type hexaferrites.
Conclusions The W-type hexaferrites were synthesized using a ceramic technique and SHS.
Online since: August 2013
Authors: He Zhang, Yao Deng, Ying Zhang, Jiu Xin Jiang
Slag α-Sialon powders synthesized by SHS were attrition milled for 24h.
The XRD photographs obtained were evaluated with a computerized scanner system. [7] To prepare powders for XRD, the samples were crushed, and the part taken for grinding into powders is shown in Fig. 1 (a).
Although the mass diffusion was further strengthened at 1800°C, overall, a small amount of Ca2+/Mg2+ ions would dissolve from α-Sialon phase to a equilibrium because of the enrichment of Ca2+/Mg2+ ions caused by SHS process, displaying the reduce of α-Sialon cell dimensions, even little smaller than that of the SHS-ed α-Sialon phase.
Recycling Processes of Si Wastes to Advanced Ceramics using SHS Reaction[J].
Phase assemblages of (Ca,Mg)-α-sialon ceramics derived from an a-sialon powder prepared by SHS[J].
The XRD photographs obtained were evaluated with a computerized scanner system. [7] To prepare powders for XRD, the samples were crushed, and the part taken for grinding into powders is shown in Fig. 1 (a).
Although the mass diffusion was further strengthened at 1800°C, overall, a small amount of Ca2+/Mg2+ ions would dissolve from α-Sialon phase to a equilibrium because of the enrichment of Ca2+/Mg2+ ions caused by SHS process, displaying the reduce of α-Sialon cell dimensions, even little smaller than that of the SHS-ed α-Sialon phase.
Recycling Processes of Si Wastes to Advanced Ceramics using SHS Reaction[J].
Phase assemblages of (Ca,Mg)-α-sialon ceramics derived from an a-sialon powder prepared by SHS[J].
Online since: October 2010
Authors: Li Xin Yue, Zhi Yong Hao
The self-propagating spraying coating was prepared by Self-propagating Hightemperature
Synthesis(SHS).
Self-propagating High-temperature Synthesis(SHS) is a method of synthesizing materials making the use of the high heat released by the reaction of SHS.
The specimen size was 10×10×4 mm, the opposite grinding was cemented carbide(HRC75), the barotropic force of the sample is 122.5N, the time on abrasive resistance is 15 minutes and the wear travel is 1200m.
Adopting the SHS to make the Fe-base self-fluxing alloy powders molten, forming the self- propagating spraying coating, the method is feasible. 2.
[2] Z.W.Li,C.S.Liu,J.H.Huang and S.Yin: Coating Technologies Based on Self-propagating Hightemperature Synthesis (SHS).
Self-propagating High-temperature Synthesis(SHS) is a method of synthesizing materials making the use of the high heat released by the reaction of SHS.
The specimen size was 10×10×4 mm, the opposite grinding was cemented carbide(HRC75), the barotropic force of the sample is 122.5N, the time on abrasive resistance is 15 minutes and the wear travel is 1200m.
Adopting the SHS to make the Fe-base self-fluxing alloy powders molten, forming the self- propagating spraying coating, the method is feasible. 2.
[2] Z.W.Li,C.S.Liu,J.H.Huang and S.Yin: Coating Technologies Based on Self-propagating Hightemperature Synthesis (SHS).