Controlling anisotropy of porous B4C structures through magnetic field-assisted freeze-casting

Bakkar, Said; Thapliyal, Saket; Ku, Nicholas; Berman, Diana; Aouadi, Samir; Brennan, Raymond E.; Young, Marcus L.

doi:10.1016/j.ceramint.2021.11.226

Cited by 9 publications

(4 citation statements)

References 31 publications

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“…The maximum weight percentage (15 wt%) was the major reason to enhance the better wear resistance and lesser coefficient of friction. It is revealed that the maximum frictional heat was generated between the specimen and counter disk, so that the heat was not increased on the specified composites by the presence of nano boron carbide particles [20][21][22][23][24][25]. The presence of nanosized boron carbide was a major aspect to improve their wear rates and similarly, the lesser setting temperature was another reason to reduce the wear tracks.…”

Section: Multiobjective Optimization On the Tribologicalmentioning

confidence: 97%

Tribological Behavior on Stir-Casted Metal Matrix Composites of Al8011 and Nano Boron Carbide Particles

Vinayaka¹,

Christiyan

Shreepad³

et al. 2023

Journal of Nanomaterials

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The aluminum metal matrix composites were broadly exploited in the applications of automotive, aerospace, and other defense with functionally graded materials-related application. Above applications definitely required excellent mechanical characteristics. Therefore, in this way, the major attempt was made on the nano-based composites with aluminum alloy utilization. In this research, aluminum alloy AA8011 and the ceramic-based reinforcement particles of nano boron carbide (B4C) were selected for producing the metal matrix composites by the liquefying process or stir casting route. The weight percentage of nano boron carbide particles having 15 wt% was subjected to add into the aluminum alloy during the stir casting process. Then, processed nano boron carbide and AA8011 specimens were prepared to conduct tribological behaviors with various processing conditions like sliding velocity, setting wear temperature, and applied load by the tribometer setup. The scanning electron microscope was employed to examine the processed composites samples and worn-out surface samples. Finally, the multiobjective optimization was used to measure the individual performances of the tribological parameters by the gray relational technique.

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Section: Multiobjective Optimization On the Tribologicalmentioning

confidence: 97%

Tribological Behavior on Stir-Casted Metal Matrix Composites of Al8011 and Nano Boron Carbide Particles

Vinayaka¹,

Christiyan

Shreepad³

et al. 2023

Journal of Nanomaterials

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“…The phase distribution and real pore structure of porous materials are characterized by 3D-XRM, without destroying the specimen. The porosity and pore size of the sample can be calculated quantitatively by Three-Dimensional Reconstruction Software, which is a practical tool to analysis porous intermetallic compounds [38][39][40][41][42]. To display the influence of the heating mode on the pore and phase distribution in the porous NiAl from 3D perspective, four fixed height slices are used as representative areas: (I-IV), as shown in Fig.…”

Section: Three-dimensional Structure Analysismentioning

confidence: 99%

Effect of the heating rate on the thermal explosion behavior and oxidation resistance of 3D-structure porous NiAl intermetallic

Cai

Cao

et al. 2022

Materials Characterization

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“…3,5,7 Group IV-V transition metal carbides and borides, such as HfC, ZrC, TaC, TiC, HfB 2 , ZrB 2 , and TiB 2 , offer the highest melting temperatures (ranging from ∼3100 • C to ∼3900 • C), making them potential materials of choice for cutting tools, thermal protection, and high-temperature tribological and nuclear power applications. [8][9][10][11][12][13][14][15] However, due to their extremely high melting temperatures, sintering of pure transition metal carbide and boride ceramics is challenging as these materials display strong covalent bonds and low self-diffusion coefficients, both of which hinder densification. 5,9 To overcome this challenge, external pressure is typically applied at high temperatures in order to reduce porosity and increase points of contact between adjacent particles, thereby achieving near-theoretical density.…”

Section: Introductionmentioning

confidence: 99%

“…UHTCs typically consist of refractory ceramics, primarily carbides, borides, and oxides, owing to their high melting temperature, chemical resistance, and mechanical properties 3,5,7 . Group IV–V transition metal carbides and borides, such as HfC, ZrC, TaC, TiC, HfB 2 , ZrB 2 , and TiB 2 , offer the highest melting temperatures (ranging from ∼3100°C to ∼3900°C), making them potential materials of choice for cutting tools, thermal protection, and high‐temperature tribological and nuclear power applications 8–15 . However, due to their extremely high melting temperatures, sintering of pure transition metal carbide and boride ceramics is challenging as these materials display strong covalent bonds and low self‐diffusion coefficients, both of which hinder densification 5,9 .…”

Section: Introductionmentioning

confidence: 99%

High‐temperature ablation of hot‐pressed HfC–SiC ceramics

Kolek,

Cooper,

Behler

et al. 2023

Int J Applied Ceramic Tech

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Effective thermal insulation materials rely on the fabrication of dense, ultra‐high‐temperature ceramics that can withstand harsh environments. Hafnium carbide‐based ceramics are one of the leading materials that have the potential to perform relatively well in high‐temperature oxidizing environments under mechanical loading due to their thermal and mechanical stability. In this study, we explore the effects of processing conditions to create dense, ablation‐resistant HfC–SiC composites with a fixed composition of HfC–20 wt.% SiC using a hot‐pressing method. Sintering pressure, temperature, and time were varied and the material's relative density, phase composition, morphology, microstructure, and hardness were investigated. Composite ceramics with 99% relative density relative to a theoretical value were created by hot pressing at 2100°C for 1 h at 50 MPa and displayed a fine microstructure with an average grain size of ∼5 µm and a Vickers hardness of 22.9 ± .8 GPa. The mass loss was determined using an oxyacetylene torch with cross‐section investigations of oxide surface formations and subsurface microstructural changes. These HfC–SiC samples developed a 410 nm hafnium oxide layer on the surface upon torch exposure and had an average calculated recession rate of .028 µm/s.

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Controlling anisotropy of porous B4C structures through magnetic field-assisted freeze-casting

Cited by 9 publications

References 31 publications

Tribological Behavior on Stir-Casted Metal Matrix Composites of Al8011 and Nano Boron Carbide Particles

Tribological Behavior on Stir-Casted Metal Matrix Composites of Al8011 and Nano Boron Carbide Particles

Effect of the heating rate on the thermal explosion behavior and oxidation resistance of 3D-structure porous NiAl intermetallic

High‐temperature ablation of hot‐pressed HfC–SiC ceramics

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