Experimental and Numerical Studies on Self-Propagating  High-Temperature Synthesis of Ta5Si3 Intermetallics

Yeh, C.L.; Chou, C.‐P.; Hwang, Po-Wen

doi:10.3390/met5031580

Cited by 11 publications

(3 citation statements)

References 24 publications

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“…TE mode of SHS is a particular case of combustion WP in a sample preheated sample. The effect of preheating on velocity and temperature of combustion wave was reported in a number of papers, for example, but in all studies the preheating temperature was considerably lower than T ig . The low T ig of 3TiO 2 –6Al–1.5Mg system during furnace heating (520 °C) and an almost 20 min delay till ignition can be explained by the fact that in this case the leading reaction starts in the sample where heat dissipation to the air is low, and propagates to the center of the sample.…”

Section: Processing Of Dense In Situ Composites Via Reactive Forgingmentioning

confidence: 97%

Reactive Forging − Pressure Assisted Thermal Explosion Mode of SHS for Processing Dense In Situ Composites and Structural Parts: A Review

Готман

Gutmanas

2018

Adv Eng Mater

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Over the last decades, there has been a decisive shift from basic science to applied research that brought about the development of a number of unconventional combustion processes that allow for simultaneous synthesis and consolidation of otherwise difficult-to-process high temperature materials. External pressure application during thermal explosion (TE) mode of self-propagating high-temperature synthesis (SHS) can produce dense products provided the combination temperature and pressure are sufficient for consolidation. In the developed TE-based reactive forging (RF) method, a self-sustained reaction is ignited by rapid heat transfer from press die and rams, and a moderate consolidation pressure is applied when the combustion product still contains a sufficient amount of liquid or very soft phase. Plastic flow of the product results in filling the shape of the die thus producing a near-net-shape part. Reactive forging (RF) is especially efficient in combination with the developed short distance infiltration (SDI) approach based on the presence of a low melting phase component (e.g., Al, Mg, Ti-Ni eutectics) in the non-dense reactant blend that is squeezed into the pores under the applied pressure thereby increasing the interparticle contact area and enhancing exothermic heat release rate. Compared to traditional reactive melt infiltration, SDI has the advantage of the considerably shorter infiltration distances (μm vs. mm-cm). Close temperature monitoring during RF and RF/SDI processing provides a deeper insight into the SHS reaction mechanisms. The "heat sink" action of the pressure die after TE results in rapid cooling of the consolidated products and correspondingly fine microstructures and high mechanical properties. Examples of successful application of the RF/SDI processing of homogeneous and functionally graded in situ composites based on binary (Al 2 O 3 , TiB 2 , TiC, TiN) and ternary (MgAl 2 O 4 , Ti 3 SiC 2 , Ti 3 AlC 2 ) ceramics, as well as intermetallic-ceramic and metal-ceramic interpenetrating phase composites are described. Nanostructuring of reactant blends results in lower SHS ignition temperatures, and thus can be utilized for two-stage ignition of multi-component composite materials and structures with tunable ignition delay. Pressure assisted SHS is a "green," cost-effective, and thus perspective manufacturing route of nearnet-shape structural parts. Examples of successful application of RF and RF-SDI approach to fabrication of ceramic matrix-diamond grinding wheels, light armor tiles and high melting temperature nozzles are presented.

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Section: Processing Of Dense In Situ Composites Via Reactive Forgingmentioning

confidence: 97%

Reactive Forging − Pressure Assisted Thermal Explosion Mode of SHS for Processing Dense In Situ Composites and Structural Parts: A Review

Готман

Gutmanas

2018

Adv Eng Mater

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“…Refractory metal-based silicide alloys, which are also referred to as refractory metal in situ composites, currently receive a lot of attention as structural materials for ultrahigh temperature applications [1][2][3]. Among these materials, Mo silicide-based alloy [4,5] and Nb silicide-based alloy [6,7] have been intensively studied due to their excellent strength, creep resistance and oxidation resistance at ultrahigh temperature.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Spherical Mo5Si3 Powder by Inductively Coupled Thermal Plasma Treatment

Kang

Park

Choe

et al. 2018

Metals

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A method was developed to fabricate spherical Mo5Si3 powder by milling and spheroidizing using inductively coupled thermal plasma. A Mo5Si3 alloy ingot was fabricated by vacuum arc melting, after which it was easily pulverized into powder by milling due to its brittle nature. The milled powders had an irregular shape, but after being spheroidized by the thermal plasma treatment, they had a spherical shape. Sphericity was increased with increasing plasma power. After plasma treatment, the percentage of the Mo3Si phase had increased due to Si evaporation. The possibility of Si evaporation was thermodynamically analyzed based on the vapor pressure of Mo and Si in the Mo5Si3 liquid mixture. By this process, spherical Mo silicide powders with high purity could be fabricated successfully.

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“…Preparation of transition metal silicides of the Ti-Si, Zr-Si, Nb-Si, Ta-Si, and Mo-Si binary systems was widely studied by the classical SHS method using elemental powder compacts of their corresponding stoichoimetries [19][20][21][22][23][24]. It should be noted that a preheating temperature of 300 • C was required to establish a planar self-propagating combustion wave for combustion synthesis of NbSi 2 and TaSi 2 [21,22], and 200 • C for the elemental powder compact of Mo:Si = 1:2 [23].…”

Section: Introductionmentioning

confidence: 99%

Combustion Synthesis of MoSi2-Al2O3 Composites from Thermite-Based Reagents

Yeh

Peng

2016

Metals

Self Cite

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Formation of MoSi 2 -Al 2 O 3 composites with a broad range of the MoSi 2 /Al 2 O 3 ratio was conducted by thermite-based combustion synthesis in the SHS mode. The addition of two thermite mixtures composed of MoO 3 + 2Al and 0.6MoO 3 + 0.6SiO 2 + 2Al into the Mo-Si reaction systems facilitated self-sustaining combustion and contributed to in situ formation of MoSi 2 and Al 2 O 3 . The samples adopting the former thermite reagent were more exothermic and produced composites with MoSi 2 /Al 2 O 3 from 2.0 to 4.5, beyond which combustion failed to proceed. Because of lower exothermicity of the reactions, the final products with MoSi 2 /Al 2 O 3 from 1.2 to 2.5 were fabricated from the SHS process involving the latter thermite mixture. Combustion temperatures of both reaction systems decreased from about 1640 to 1150 • C with increasing MoSi 2 /Al 2 O 3 proportion, which led to a phase transition of MoSi 2 . It was found that the dominant silicide was β-MoSi 2 when the combustion temperature of the synthesis reaction exceeded 1550 • C and shifted to α-MoSi 2 as the combustion temperature fell below 1320 • C. The results of this study showed an energy-efficient fabrication route to tailor the phase and content of MoSi 2 in the MoSi 2 -Al 2 O 3 composite.

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Experimental and Numerical Studies on Self-Propagating High-Temperature Synthesis of Ta5Si3 Intermetallics

Cited by 11 publications

References 24 publications

Reactive Forging − Pressure Assisted Thermal Explosion Mode of SHS for Processing Dense In Situ Composites and Structural Parts: A Review

Reactive Forging − Pressure Assisted Thermal Explosion Mode of SHS for Processing Dense In Situ Composites and Structural Parts: A Review

Preparation of Spherical Mo5Si3 Powder by Inductively Coupled Thermal Plasma Treatment

Combustion Synthesis of MoSi2-Al2O3 Composites from Thermite-Based Reagents

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