Spark Plasma Sintering of SHS Powders

Orrù, Roberto; Cao, Giacomo

doi:10.1016/b978-0-12-804173-4.00140-x

Cited by 4 publications

(3 citation statements)

References 5 publications

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“…Further studies demonstrated the capability of the SHS technique to produce powders that are characterized by a high sintering capacity with respect to powders produced by traditional techniques (furnace, solution methods, etc.) [ 4 , 5 ]. The improved sinterability of SHS powders is attributed to the significant concentration of inborn defects, owing to extremely high heating and cooling processes imminent in the exothermic reaction [ 5 , 6 , 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

“…[ 4 , 5 ]. The improved sinterability of SHS powders is attributed to the significant concentration of inborn defects, owing to extremely high heating and cooling processes imminent in the exothermic reaction [ 5 , 6 , 7 , 8 ]. These defects are importantly entertained in various physicochemical phenomena, particularly at elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…These defects are importantly entertained in various physicochemical phenomena, particularly at elevated temperatures. The high concentration of defects in the SHS-derived powders is regarded as being likely to both intensify the mass transfer processes during sintering and allow for the successful consolidation of refractory materials at relatively low sintering temperatures [ 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

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SHS-Derived Powders by Reactions’ Coupling as Primary Products for Subsequent Consolidation

2021

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The capability of self-propagating high-temperature synthesis (SHS) to produce powders that are characterized by a high sintering ability, owing to high heating and cooling rates inherent to the exothermic reaction, is of a special interest for the industry. In particular, SHS-derived powders comprise a significant defect concentration in order to effectively enhance the mass transfer processes during the sintering, which allows for the successful consolidation of difficult-to-sinter materials at relatively low sintering temperatures. From this perspective, the design of precursors suitable for sintering, synthesis in a controlled temperature regime and the optimization of geometrical and structural parameters of SHS powders as a potential feedstock for the consolidation is of key importance. Here, we report on the comparative studies concerning the SHS processing of composites for advanced powder metallurgy techniques. The synthesis and sintering peculiarities of the SHS through coupled reactions in the Me’O3(WO3,MoO3)-Me’’O(CuO,NiO)-Mg-C, Ti-B-Al12Mg17 systems are comparatively reviewed. The SHS coupling approach was used for the preparation of powders with a tuned degree of fineness (a high specific surface area of particles), a high-homogeneity and a controllable distribution of elements via both the regulation of the thermal regime of combustion in a wide range and the matching of the thermal and kinetic requirements of two interconnected reactions. Microstructural features of the powder feedstock greatly contributed to the subsequent consolidation process.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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SHS-Derived Powders by Reactions’ Coupling as Primary Products for Subsequent Consolidation

2021

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Application of SHS in the Manufacture of (NiAl/Ni3Al)/TiB2 Composite

Hyjek

Sulima

Jaworska

2019

Metall Mater Trans A

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The aim of this study was to demonstrate the advantages and the method of application of the SHS process in the manufacture of (NiAl/Ni 3 Al)/TiB 2 composites. A comparison was made between sinters manufactured by FAST/SPS using two different routes to process the substrates, which formed the composite matrix. The evaluation criteria were based on measurements of selected physical, mechanical, and tribological properties, and on microstructure examinations. The evaluation has indicated a preferable method for the manufacture of composites, where the SHS reaction takes place during compaction of the powder mixture. This produces a sinter characterized not only by the high degree of sintering, and high values of the Young's modulus and HV1 hardness, but also by the satisfactory resistance to tribological wear. Additionally, the use of this process saves energy and reduces product-making cost, owing to a less expensive technique of making individual substrates.

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Heterophase ceramics in the Hf–Si–Mo–B system obtained by a combination of SHS and hot pressing methods

Pogozhev

Лемешева

Potanin

et al. 2019

Izv.VUZ. Tsvet. Met.

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The paper focuses on obtaining heterophase powder ceramics and consolidated ceramics based on borides and silicides of hafnium and molybdenum by combining the methods of self-propagating high-temperature synthesis (SHS) and hot pressing (HP). Composite ceramic SHS powders HfB2–HfSi2–MoSi2 were obtained according to the scheme of magnesium-thermal reduction from oxide raw materials where the combustion wave is characterized by temperatures of 1750–2119 K and high mass combustion rates of 8,4– 9,3 g/s. The structure of synthesized SHS powders consists of relatively large MoSi2 grains up to 10 μm in size and submicron elongated HfB2 grains located mainly inside the MoSi2 grains and rounded Si precipitates. The composition with a lower concentration of boron contains a large number of polyhedral HfSi2 grains with a size of less than 10 μm. The resulting powders are characterized by an average particle size of ~6 μm with a maximum size up to 26 μm. Phase compositions of ceramics consolidated by the HP method and SHS synthesized powders are identical. The microstructure of compact samples consists of faceted HfB2 elongated grains 0,5– 10,0 μm in size, polyhedral HfSi2 and MoSi2 grains up to 8–10 μm in size and silicon interlayers. Consolidated ceramics has a high structural and chemical homogeneity, low residual porosity of 1,1–1,7 %, high hardness of 11,7–12,6 GPa and thermal conductivity of 62–87 W/(m·K).

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Spark Plasma Sintering of SHS Powders

Cited by 4 publications

References 5 publications

SHS-Derived Powders by Reactions’ Coupling as Primary Products for Subsequent Consolidation

SHS-Derived Powders by Reactions’ Coupling as Primary Products for Subsequent Consolidation

Application of SHS in the Manufacture of (NiAl/Ni3Al)/TiB2 Composite

Heterophase ceramics in the Hf–Si–Mo–B system obtained by a combination of SHS and hot pressing methods

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