Mechanical properties of room-temperature injection molded, pressurelessly sintered boron carbide

Weaver, Erich A.; Stegman, Benjamin; Trice, Rodney W.; Youngblood, Jeffrey P.

doi:10.1016/j.ceramint.2022.01.015

Cited by 7 publications

(5 citation statements)

References 24 publications

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“…The relative bulk density was calculated based on the results of phase identification from the XRD analysis and measured volume portion of phases from the image analysis. The theoretical densities were calculated according to the rule of mixture using the density values of pure phases: 2.52 g/cm 3 for B 4 C and 4.52 g/cm 3 for TiB 2 . The hardness and fracture toughness were measured using a Vickers indenter with load of 5 kgf (49.03 N) and indentation time of 10 s. The fracture toughness K IC of the B 4 C-TiB 2 ceramic composites was calculated using the formula proposed by Shetty [39]:…”

Section: Methodsmentioning

confidence: 99%

“…B 4 C ceramics is characterised by high melting point (2450 °C) and hardness (28)(29)(30)(31)(32)(33)(34)(35)(36)(37) as it is the third hardest material after diamond and cubic boron nitride. It has low density (2.52 g/cm 3 ) and high Young's modulus (360-460 GPa) [1][2][3][4][5]. It has good impact and wear resistance, excellent resistance to chemical agents as well as high capacity for neutron absorption [4,6,7].…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and mechanical properties of b4c-tib2 composites reactive sintered from B4C + TiO2 precursors

Švec

Čaplovič

2022

PAC

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Ceramic composites consisting of a boron carbide (B4C) matrix and titanium diboride (TiB2) secondary phase were obtained by reactive sintering from boron carbide powder with 40 and 50wt.% of titanium dioxide (TiO2) additive. The same sintering temperature of 1850?C and pressure of 35MPa, but different sintering times from 15 to 60min, were applied during reactive hot pressing of the composites in vacuum. The effects of TiO2 content and sintering time on phase compositions, microstructures and mechanical properties of the composites were studied. The TiO2 additive enhanced densification of the B4C-TiB2 ceramic composites. Both Vickers hardness and the fracture toughness of the composites increased with prolongation of sintering time. The highest hardness of 29.8GPa was achieved for the composite with 29.6 vol.% of TiB2 obtained by sintering of the precursor with 40wt.% of TiO2 additive for 60min. The fracture toughness reached a maximum value of 7.5MPa?m1/2 for the composite containing 40.2 vol.% of TiB2, which was fabricated by reactive sintering of the precursor with 50wt.% of TiO2 additive for 60min.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructure and mechanical properties of b4c-tib2 composites reactive sintered from B4C + TiO2 precursors

Švec

Čaplovič

2022

PAC

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“…Among these materials, B 4 C has gained widespread usage in various reactors. This popularity is due to its numerous advantages, including a high absorption cross-section, a high melting temperature, high hardness, affordability, minimal gamma secondary radiation after neutron absorption, and ease of waste material disposal [1][2][3][4][5]. According to the early literature, out of 282 power reactors constructed worldwide, 123 utilized B 4 C control rods, representing approximately 43.6% [6].…”

Section: Introductionmentioning

confidence: 99%

Study on the Thermophysical Properties of 80% 10B Enrichment of B4C

Lv,

Hu,

Cao

et al. 2023

Materials

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In this paper, a specific type of Boron Carbide (B4C) with a high enrichment of 80 ± 0.3 at% 10B was prepared as an absorbing material for control rods in nuclear reactors. The enrichment of 10B was achieved using a chemical exchange method, followed by obtaining boron carbide powder through a carbothermal reduction method. Finally, B4C with a high enrichment of 68.3~74.2% theoretical density was obtained using a hot-pressed sintering process. This study focused on investigating the basic out-of-pile thermophysical properties of the high enrichment B4C compared to natural B4C reference pellets under non-irradiated conditions. These properties included the thermal expansion coefficient, thermal conductivity, emissivity, elastic limit, elastic modulus, and Poisson’s ratio. The research results indicate that the enriched B4C pellet exhibits good thermal stability and meets the technical requirements for mechanical capability. It was observed that porosity plays a significant role in determining the out-of-pile mechanical capability of B4C, with higher porosity samples having a lower thermal conductivity, elastic–plastic limit, and elastic modulus. In short, all the technical indexes studied meet the requirements of nuclear-grade Boron Carbide pellets for Pressurized Water Reactors.

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“…Boron carbide has interesting combination of properties such as high melting point (2445 °C), low density (2.5 g/cm 3 ), high hardness, good resistance against chemical agents, high wear resistance, good modulus of elasticity, high neutron absorption and high impact resistance [1][2][3][4]. This material is widely used in industry and has become one of the most important and strategic engineering ceramics [5][6][7]. Therefore, acquiring the technical knowledge of B4C production, achieving its manufacturing technology from available raw materials, as well as using cost-effective fabrication methods are of special importance [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Performance of glucose, sucrose and cellulose as carbonaceous precursors for the synthesis of B4C powders

et al. 2022

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Boron carbide is the third hardest material in the world after diamond and cubic boron nitride, which is one of the most strategic engineering ceramics in various industrial applications. The aim of this research is to synthesize B4C by reacting boric acid as boron source with polymers from the saccharide family as carbon sources, and to determine the best saccharide as precursor. For this purpose, glucose (monosaccharide), sucrose (disaccharide), and cellulose (polysaccharide) were used and examined. The samples were prepared by appropriate mixing of the starting materials, pyrolysis at 700 °C, and synthesis at 1500 °C. The results of Fourier transform infrared (FT-IR) spectroscopy and X-ray diffractometry (XRD) showed that among the studied saccharide polymers, glucose is the best carbon source candidate for the synthesis of B4C. To describe precisely, the specimen prepared with glucose and boric acid had more boron carbide and less hydrocarbon.

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Mechanical properties of room-temperature injection molded, pressurelessly sintered boron carbide

Cited by 7 publications

References 24 publications

Microstructure and mechanical properties of b4c-tib2 composites reactive sintered from B4C + TiO2 precursors

Microstructure and mechanical properties of b4c-tib2 composites reactive sintered from B4C + TiO2 precursors

Study on the Thermophysical Properties of 80% 10B Enrichment of B4C

Performance of glucose, sucrose and cellulose as carbonaceous precursors for the synthesis of B4C powders

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