Synthesis, Structure, and Phase Composition of High-Entropy Ceramics (HfTiCN)-TiB2

Evseev, Nikolay; Matveev, Alexey; Nikitin, Pavel

doi:10.1134/s0036023622080095

Cited by 3 publications

(1 citation statement)

References 27 publications

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“…Powder metallurgy methods serve as the primary technologies for manufacturing composite materials. These methods encompass various techniques, including selective laser sintering [31][32][33][34][35], hot isostatic pressing [36][37][38], spark plasma sintering [39][40][41][42], selfpropagating high-temperature synthesis (SHS) [43][44][45][46], and several other methods [47][48][49][50], wherein pressed powder green samples serve as precursors. The quality of the green sample, which encompasses factors like uniform density along its height and radius, relative density across the entire batch, and technological strength, significantly influences the physical, mechanical, and operational properties of the resulting products.…”

Section: Introductionmentioning

confidence: 99%

Compactability Regularities Observed during Cold Uniaxial Pressing of Layered Powder Green Samples Based on Ti-Al-Nb-Mo-B and Ti-B

Bazhin,

Konstantinov,

Chizhikov

et al. 2023

Metals

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We determined the compactability regularities observed during the cold uniaxial pressing of layered powder green samples, taking into account factors such as composition, height, and number of Ti–B (TiB) and Ti–Al–Nb–Mo–B (TNM) layers. The following composition was chosen for the TNM layer at %: 51.85Ti–43Al–4Nb–1Mo–0.15B, while for the Ti-B layer we selected the composition wt %: Ti-B-(20, 30, 40) Ti. Green samples were made containing both 100 vol % TiB and TNM, and those taken in the following proportions, vol %: 70TiB/30TNM, 50TiB/50TNM, 30TiB/70TNM; multilayer green samples were studied in the following proportions, vol %: 35TiB/30TNM/35TiB, 25TiB/25TNM/25TiB/25TNM, 35TNM/30TiB/35TNM. Based on the obtained rheological data, we determined the rheological characteristics of the layered green samples, including compressibility modulus, compressibility coefficient, relaxation time, and limiting value of linear section deformation. These characteristics were found to vary depending on the composition, height, and number of layers. Our findings revealed that reducing the TNM content in the charge billet composition improves the compaction of powder materials under the given technological parameters of uniaxial cold pressing. Moreover, we observed that increasing the boron content and decreasing the amount of titanium in the Ti–B composition enhances the compactability of powder materials. We also established a relationship between the compaction pressure interval and the density of the layered powder green sample.

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Section: Introductionmentioning

confidence: 99%

Compactability Regularities Observed during Cold Uniaxial Pressing of Layered Powder Green Samples Based on Ti-Al-Nb-Mo-B and Ti-B

Bazhin,

Konstantinov,

Chizhikov

et al. 2023

Metals

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Synthesis of Boron Nitride by Reduction of Boron Oxide with Aluminum in Nitrogen

Tkachev,

Ziatdinov,

Zhukov

et al. 2023

Russ. J. Inorg. Chem.

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Synthesis of Boron Nitride by Reduction of Boron Oxide with Aluminum in Nitrogen

Tkachev,

Ziatdinov,

Zhukov

et al. 2023

Žurnal neorganičeskoj himii

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The paper presents the results of studies of the self-propagating high temperature synthesis (SHS) of boron nitride via chemical reduction of boron oxide with aluminum in a nitrogen medium. The phase composition of the powder reaction products depending on the nitrogen pressure during the synthesis was studied by X-ray diffraction. It was found that SHS in the B2O3–Al system gives the BN–Al2O3 powder material containing 20–28 wt % hexagonal boron nitride depending on the nitrogen pressure. Microstructure examination showed that the obtained powder materials contains separate hexagonal BN particles with 3 μm size. The differences in the density and morphology of BN and Al2O3 determine the possibility of BN isolation from the obtained powder mixture by the pneumatic powder separation methods.

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Synthesis, Structure, and Phase Composition of High-Entropy Ceramics (HfTiCN)-TiB2

Cited by 3 publications

References 27 publications

Compactability Regularities Observed during Cold Uniaxial Pressing of Layered Powder Green Samples Based on Ti-Al-Nb-Mo-B and Ti-B

Compactability Regularities Observed during Cold Uniaxial Pressing of Layered Powder Green Samples Based on Ti-Al-Nb-Mo-B and Ti-B

Synthesis of Boron Nitride by Reduction of Boron Oxide with Aluminum in Nitrogen

Synthesis of Boron Nitride by Reduction of Boron Oxide with Aluminum in Nitrogen

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