Microstructural evolution during the infiltration of boron carbide with molten silicon

Hayun, Shmuel; Weizman, Abraham; Dariel, M.P.; Frage, N.

doi:10.1016/j.jeurceramsoc.2009.09.021

Cited by 103 publications

(67 citation statements)

References 32 publications

(51 reference statements)

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“…There were three different reaction mechanisms of B 4 C and Si proposed by different groups: (i) Hayun et al reported that B 4 C reacted with silicon by dissolution of B 4 C particles in molten silicon and resulted in the precipitation of ternary B 12 (C,Si,B) 3 compounds; 18 (ii) Mallick et al reported that B 4 C-phase reacted at its interface with an Si-phase by dissolution of Si in the carbide phase; 19 and (iii) Patel et al reported that carbon in B 4 C reacts with silicon to form SiC, due to the nonstiochiometric compound of B x C in which carbon percentage varies from 7 to 20 at%. 20 The reaction mechanisms of B 4 C with Si could be explained by the combination of the above-mentioned mechanisms.…”

Section: (1) Phase Compositionmentioning

confidence: 99%

“…Furthermore, some efforts were devoted to studying the phase compositions and microstructure formation mechanisms, and found that B 4 C-phase reacts with Si-phase. [17][18][19][20] So far, to the author's knowledge, no special attention has been paid to the infiltration temperature and its influence on the microstructure and mechanical properties of RBBC ceramics in the open literature.…”

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confidence: 99%

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The Role of Infiltration Temperature in the Reaction Bonding of Boron Carbide by Silicon Infiltration

Zhang

Wang

et al. 2014

J. Am. Ceram. Soc.

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The present paper is concerned on the effect of infiltration temperature on the components, microstructure, and mechanical properties of reaction-bonded boron carbide (RBBC) ceramics. RBBC ceramics were fabricated by reactive infiltration of molten silicon (Si) into porous preforms containing boron carbide (B 4 C) and free carbon. It has been found that infiltration temperatures have significant influence on the infiltration reactions involved and therefore the evolution of different phases formed in the RBBC ceramics. An increase in grain size of boron carbide particles through the coalescence of neighboring grains was observed at certain infiltration temperatures. The morphology of silicon carbide (SiC) phases developed from discontinuous and cloud-like SiC to continuous and integrated SiC zones with the increase of infiltration temperatures. With increasing temperatures up to 1600°C, the hardness, flexural strength, and fracture toughness all increased. When the temperatures exceeded 1600°C, while the hardness and flexural strength decreased, the fracture toughness continued to increase.

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Section: (1) Phase Compositionmentioning

confidence: 99%

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confidence: 99%

The Role of Infiltration Temperature in the Reaction Bonding of Boron Carbide by Silicon Infiltration

Zhang

Wang

et al. 2014

J. Am. Ceram. Soc.

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“…However, these results suggest that YAG-YAP phase transformation has also occurred in our samples. This can be explained by a congruent dissolution-precipitation mechanism [16,17]. During the heat treatment, YAG phase dissolves into the ferritic matrix and YAP precipitates.…”

Section: Discussionmentioning

confidence: 99%

Microstructural Evolution of Cr-Rich ODS Steels as a Function of Heat Treatment at 475 °C

Foxman

Sobol

Pinkas³

et al. 2012

Metallogr. Microstruct. Anal.

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In the current research, the effect of heat treatment on the morphology of the dispersoids and their phase composition were investigated in three Cr-rich ferritic oxide dispersion strengthened (ODS) steels: PM2000, MA956, and ODM751. The steels were aged at 475°C for times ranging from 100 to 1,000 h. The microstructure was characterized using transmission electron microscopy. Study of the as-recrystallized samples revealed nano-scale Y-Al-O complex-oxide particles dispersed in the ferritic matrix. These dispersoids, which differ in size (10-160 nm) and geometry (polygonal and spherical), were identified as Y 4 Al 2 O 9 , YAlO 3 , and Y 3 Al 5 O 12 . After heat treatment, a significant change in the morphology, size, and distribution of the dispersoids was observed. Changes in the phase composition of the oxide dispersoids were also observed: YAlO 3 (with perovskite structure) was identified as the most dominant phase, indicating that it is probably the most stable phase in the Cr-rich ferritic ODS steels.

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“…Duringthe maunufacture of B 4 C powder, the powder surface will form a very thin oxide layer; this very thin oxide layer will block the materials transfer during sintering, and also the oxide layer will reduve the activity of the powder itself; this will halt the large B 4 C ceramic forming during sintering. By adding suitable amount of Carbon, this can get rid of surface oxide layer in the B 4 C surface; reduce the resistance again the sintering reaction by increasing the surface energy of the B 4 C powde [9]r. This will benefits the formation of the ceramic and increase the ceramic density, the hardness of the ceramic will improve as well.…”

Section: Fig5the Densities Of B4c Samples With Different Contents Ofmentioning

confidence: 99%

Effect of the Addition of Carbon on the Sintering Properties of Boron Carbide Ceramics prepared by Pressureless Sintering

Shi¹,

Cao²,

Li³

et al. 2015

Proceedings of the 3rd International Conference on Material, Mechanical and Manufacturing Engineering

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Abstract. Effect of the addition of carbon on the sintering properties of pressureless sintered boron carbide ceramics was investigated by using carbon black and phenolic resins as the main additives. There were three ways for adding Carbon, carbon black adding, phenolic resins adding and adding carbon black and phenolic resins mixtures . The density and microstructure of sintered B 4 C ceramics were analyzed by densitometer and optical microscope respectively. The effect on the densification of B 4 C ceramics by different content and adding method of carbon were analyzed and summarized. The results showed that the B 4 C ceramics has the optimum properties, that bulk density , bending strength, hardness and fracture toughness achieve 2.42g/cm 3 ,335MPa,22Gpa and 3.17 Mpa•m 1/2 , respectively under the adding the mixture of 5.5%, carbon black and 1.5%, phenolic resins.

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Microstructural evolution during the infiltration of boron carbide with molten silicon

Cited by 103 publications

References 32 publications

The Role of Infiltration Temperature in the Reaction Bonding of Boron Carbide by Silicon Infiltration

The Role of Infiltration Temperature in the Reaction Bonding of Boron Carbide by Silicon Infiltration

Microstructural Evolution of Cr-Rich ODS Steels as a Function of Heat Treatment at 475 °C

Effect of the Addition of Carbon on the Sintering Properties of Boron Carbide Ceramics prepared by Pressureless Sintering

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