The synthesis of SiCB4C ceramics by combustion during hot-pressing

Pánek, Z.

doi:10.1016/0955-2219(93)90092-6

Cited by 11 publications

(4 citation statements)

References 2 publications

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“…255 Combination of SHS technique with hot pressing (called combustion hot pressing) has been used to prepare a composite, containing B 4 C and SiC formed by reaction among Si, B and C, in the form of interlocked matrices with very low porosity and uniform microstructure. 273 Graded porosity B 4 C materials can be produced by a layering approach using different size distributions of B 4 C powders in the green state, and then densifying the layered assembly by hot pressing at 1900uC. 274 Cobalt as sinter additive has also been attempted for hot pressing of boron carbide powders with 5 wt-%TiC at temperatures ,1500uC and a high pressure of 5-6 GPa.…”

Section: Liquid Phase Sinteringmentioning

confidence: 99%

Synthesis and consolidation of boron carbide: a review

Suri

Subramanian

Sonber

et al. 2010

International Materials Reviews

647

290

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Boron carbide is a strategic material, finding applications in nuclear industry, armour for personnel and vehicle safety, rocket propellant, etc. Its high hardness makes it suitable for grinding and cutting tools, ceramic bearing, wire drawing dies, etc. Boron carbide is commercially produced either by carbothermic reduction of boric acid in electric furnaces or by magnesiothermy in presence of carbon. Since many specialty applications of boron carbide require dense bodies, its densification is of great importance. Hot pressing and hot isostatic pressing are the main processes employed for densification. In the recent past, various researchers have made attempts to improve the existing methods and also invent new processes for synthesis and consolidation of boron carbide. All the techniques on synthesis and consolidation of boron carbide are discussed in detail and critically reviewed.

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Section: Liquid Phase Sinteringmentioning

confidence: 99%

Synthesis and consolidation of boron carbide: a review

Suri

Subramanian

Sonber

et al. 2010

International Materials Reviews

647

290

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“…SHS was employed to achieve a low energy consumption process by using strong and weak exothermicity related to the formation of TiB 2 and B 4 C, respectively, as well as for other combinations i.e. TiC + SiC [37,38], or SiC-B 4 C [13]. However, by conducting the synthesis simultaneously under high pressure, the composites can be fabricated in a one stage process.…”

Section: Introductionmentioning

confidence: 99%

“…Several authors proposed the fabrication of TiB 2 -B 4 C composites by a carbothermal reduction method [9,10], however, with respect to purity of the composites and reduction completeness, the synthesis using pure elemental powders seems to be more effective for such purposes [3]. By using elemental powders, much better purity with significant reduction of porosity was experienced [38]. …”

Section: Introductionmentioning

confidence: 99%

TiB2-Based Composites for Ultra-High-Temperature Devices, Fabricated by SHS, Combining Strong and Weak Exothermic Reactions

Ziemnicka-Sylwester

2013

Materials

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TiB2-based ceramic matrix composites (CMCs) were fabricated using elemental powders of Ti, B and C. The self-propagating high temperature synthesis (SHS) was carried out for the highly exothermic “in situ” reaction of TiB2 formation and the “tailing” synthesis of boron carbide characterized by weak exothermicity. Two series of samples were fabricated, one of them being prepared with additional milling of raw materials. The effects of TiB2 vol fraction as well as grain size of reactant were investigated. The results revealed that combustion was not successful for a TiB2:B4C molar ratio of 0.96, which corresponds to 40 vol% of TiB2 in the composite, however the SHS reaction was initiated and self-propagated for the intended TiB2:B4C molar ratio of 2.16 or above. Finally B13C2 was formed as the matrix phase in each composite. Significant importance of the grain size of the C precursor with regard to the reaction completeness, which affected the microstructure homogeneity and hardness of investigated composites, was proved in this study. The grain size of Ti powder did not influence the microstructure of TiB2 grains. The best properties (HV = 25.5 GPa, average grain size of 9 μm and homogenous microstructure), were obtained for material containing 80 vol% of TiB2, fabricated using a graphite precursor of 2 μm.

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“…This suggests that B 4 C–SiC ceramics with a high SiC content are not easily densified through this route. In addition, Pánek 97 used B powders, Si platelets, and carbon black as raw materials to produce B 4 C–SiC ceramics in situ (reaction (2)) by combustion hot-press sintering, which is based on the combination of the self-propagating high-temperature synthesis technique and hot-press sintering. The resulting B 4 C–SiC ceramics can achieve an extremely low porosity (0.3%), and their purity is rather high.4B + Si + 2C → B 4 C + SiC…”

Section: Sintering Performance and Microstructure Of B4c–sic Composit...mentioning

confidence: 99%

Recent progress in B₄C–SiC composite ceramics: processing, microstructure, and mechanical properties

Zhang

2023

Mater. Adv.

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The synthesis of SiCB4C ceramics by combustion during hot-pressing

Cited by 11 publications

References 2 publications

Synthesis and consolidation of boron carbide: a review

Synthesis and consolidation of boron carbide: a review

TiB2-Based Composites for Ultra-High-Temperature Devices, Fabricated by SHS, Combining Strong and Weak Exothermic Reactions

Recent progress in B₄C–SiC composite ceramics: processing, microstructure, and mechanical properties

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The synthesis of SiCB4C ceramics by combustion during hot-pressing

Cited by 11 publications

References 2 publications

Synthesis and consolidation of boron carbide: a review

Synthesis and consolidation of boron carbide: a review

TiB2-Based Composites for Ultra-High-Temperature Devices, Fabricated by SHS, Combining Strong and Weak Exothermic Reactions

Recent progress in B4C–SiC composite ceramics: processing, microstructure, and mechanical properties

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Recent progress in B₄C–SiC composite ceramics: processing, microstructure, and mechanical properties