In-situ synthesis and densification of HfB 2  ceramics by the spark plasma sintering technique

Gürcan, Kübra; Ayas, Erhan

doi:10.1016/j.ceramint.2016.11.164

Cited by 23 publications

(12 citation statements)

References 29 publications

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“…In the solid state category, HfB 2 can be produced by reduction‐based reactions using various reducing agents. The carbothermic reduction in HfO 2 and B 2 O 3 , the borothermic reduction in HfO 2 , the reduction in HfO 2 by B 4 C in the presence of carbon, and the borothermic reduction in HfCl 4 have all been reported, among other reactions. However, the above reduction‐based routes suffer from either endothermic or poorly exothermic reactions and require elevated temperatures in order to proceed.…”

Section: Introductionmentioning

confidence: 90%

Self‐propagating mechanosynthesis of HfB₂ nanoparticles by a magnesiothermic reaction

2017

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A mechanically induced self-sustaining reaction (MSR) was used to synthesize hafnium diboride nanoparticles. Along this route, magnesium was selected as a robust reducing agent for co-reduction in boron and hafnium oxides in a combustive manner. Combustion occurred after a short milling period of 12 minutes. The hafnium diboride nanoparticles had a polygonal faceted morphology and were 50-250 nm in diameter. The assessment of the processing mechanism revealed that the initial combustive reduction in B 2 O 3 to elemental B by Mg was the major step for progressing the overall reaction. After that, HfO 2 can be reduced to elemental Hf, followed by the synthesis of HfB 2 phase.combustion, Hafnium diboride (HfB 2 ), Mechanosynthesis, Nanoparticles

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Section: Introductionmentioning

confidence: 90%

Self‐propagating mechanosynthesis of HfB₂ nanoparticles by a magnesiothermic reaction

2017

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“…Fig. 2 Some summary data for common UHTCs ubiquitous in literature; HfB2, ZrB2, ZrC, HfC, TaC, TiB2, SiC is provided for contrast, due to its frequent inclusion as a secondary matrix component [13], [29]- [35]. 2 and their use, b) different applications and properties [128], [134]- [141].…”

Section: List Of Figuresmentioning

confidence: 99%

Selection, processing, properties and applications of ultra-high temperature ceramic matrix composites, UHTCMCs – a review

Binner

Porter

Baker

et al. 2020

International Materials Reviews

251

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April 1 st 2019 he was also the Deputy Head of the College of Engineering & Physical Sciences. He has been active in ceramics processing research since 1981 and has published ~220 refereed papers, as well as editing or contributing to 19 books and holding 7 patents with an 8 th recently submitted. He has attracted 129 research grants to date, totalling ~£16.5M, this includes a current portfolio of about £1.9M. The focus of his research is the generation of both the necessary scientific understanding and the required engineering solutions for the design and development of materials and process routes that display technical and/or economic advantages over existing approaches. The range of products worked on ranges from nanostructured to traditional ceramics, interpenetrating composites to ultra-high temperature ceramic matrix composites. He has worked closely with industry to translate key developments, e.g. through the creation of a spin-out company to develop a ceramic sensor for measuring soil matric potential (1991), or via licensing, e.g. manufacturing routes for producing engineering ceramic foams (1995) and nanostructured ceramics (2012). He has supervised 35 Ph.D. students and 2 M.Phil. students to successful completion and 38 postdoctoral researchers. A further 7 Ph.D. students and 6 postdoctoral researchers are currently being supervised with more positions currently advertised. His research has received both national and international recognition; he has given ~65 keynotes, plenary and invited talks at international conferences, whilst the Institute of Materials, Minerals and Mining has awarded him the Holliday Prize (1995), Ivor Jenkins Medal

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“…Hot pressing (HP) and spark plasma sintering (SPS) are two most commonly-used fabrication routes to prepare UHTCs and composites on their basis [2][3][4][5][6][7][8]. Combustion synthesis in the mode of self-propagating high-temperature synthesis (SHS) has been a promising alternative, which takes advantage of highly exothermic reactions, and hence, has merits of low energy requirement, short processing time, simplicity, and high-purity products [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…Several borides and carbides of transition metals of the groups IVb and Vb are considered as ultra-high temperature ceramics (UHTCs) based on their melting temperatures in excess of 3000 • C and other properties, such as high hardness, high flexural strength, high thermal conductivity, and excellent resistance to thermal shock and corrosion [1][2][3]. UHTC composites-for example TiB 2 -TiC, ZrB 2 -SiC, ZrB 2 -TaB 2 , and NbB 2 -SiC-have been of great importance for extreme environment applications requiring high thermal-shock resistance and durability against a rapid temperature change [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Combustion Synthesis of UHTC Composites from Ti–B4C Solid State Reaction with Addition of VIb Transition Metals

Yeh

Lin

2017

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UHTC composites were prepared by self-propagating high-temperature synthesis (SHS) from the Ti-B 4 C reaction system with addition of Cr, Mo, and W. The starting sample composition was formulated as (3−x)Ti + B 4 C + xMe with x = 0.1-1.0 and Me = Cr, Mo, or W. For all samples conducted in this study, self-sustaining combustion was well established and propagated with a distinct reaction front. With no addition of Cr, Mo, or W, solid state combustion of the 3Ti + B 4 C sample featuring a combustion front temperature (T c ) of 1766 • C and a combustion wave velocity (V f ) of 16.5 mm/s was highly exothermic and produced an in situ composite of 2TiB 2 + TiC. When Cr, Mo, or W was adopted to replace a portion of Ti, the reaction exothermicity was lowered, and hence, a significant decrease in T c (from 1720 to 1390 • C) and V f (from 16.1 to 3.9 mm/s) was observed. With addition of Cr, Mo, and W, the final products were CrB-, MoB-, and WB-added TiB 2 -TiC composites. The absence of CrB 2 , MoB 2 , and WB 2 was attributed partly to the loss of boron from thermal decomposition of B 4 C and partly to lack of sufficient reaction time inherent to the SHS process.

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In-situ synthesis and densification of HfB 2 ceramics by the spark plasma sintering technique

Cited by 23 publications

References 29 publications

Self‐propagating mechanosynthesis of HfB₂ nanoparticles by a magnesiothermic reaction

Self‐propagating mechanosynthesis of HfB₂ nanoparticles by a magnesiothermic reaction

Selection, processing, properties and applications of ultra-high temperature ceramic matrix composites, UHTCMCs – a review

Combustion Synthesis of UHTC Composites from Ti–B4C Solid State Reaction with Addition of VIb Transition Metals

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In-situ synthesis and densification of HfB 2 ceramics by the spark plasma sintering technique

Cited by 23 publications

References 29 publications

Self‐propagating mechanosynthesis of HfB2 nanoparticles by a magnesiothermic reaction

Self‐propagating mechanosynthesis of HfB2 nanoparticles by a magnesiothermic reaction

Selection, processing, properties and applications of ultra-high temperature ceramic matrix composites, UHTCMCs – a review

Combustion Synthesis of UHTC Composites from Ti–B4C Solid State Reaction with Addition of VIb Transition Metals

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Self‐propagating mechanosynthesis of HfB₂ nanoparticles by a magnesiothermic reaction

Self‐propagating mechanosynthesis of HfB₂ nanoparticles by a magnesiothermic reaction